From fe8db0c5ee3365a2fc80ee7ebffa238f9a0a2ae2 Mon Sep 17 00:00:00 2001 From: Tom Gundersen Date: Thu, 27 Feb 2014 01:24:05 +0100 Subject: sd-network: add new library This is similar to sd-login, but exposes the state of networkd rather than logind. Include it in libsystemd-dhcp and rename it to libsystemd-network. --- src/libsystemd-network/Makefile | 1 + src/libsystemd-network/dhcp-internal.h | 55 ++ src/libsystemd-network/dhcp-lease-internal.h | 59 ++ src/libsystemd-network/dhcp-network.c | 109 +++ src/libsystemd-network/dhcp-option.c | 184 +++++ src/libsystemd-network/dhcp-packet.c | 191 +++++ src/libsystemd-network/dhcp-protocol.h | 121 +++ src/libsystemd-network/sd-dhcp-client.c | 1051 ++++++++++++++++++++++++++ src/libsystemd-network/sd-dhcp-lease.c | 401 ++++++++++ src/libsystemd-network/test-dhcp-client.c | 496 ++++++++++++ src/libsystemd-network/test-dhcp-option.c | 378 +++++++++ 11 files changed, 3046 insertions(+) create mode 120000 src/libsystemd-network/Makefile create mode 100644 src/libsystemd-network/dhcp-internal.h create mode 100644 src/libsystemd-network/dhcp-lease-internal.h create mode 100644 src/libsystemd-network/dhcp-network.c create mode 100644 src/libsystemd-network/dhcp-option.c create mode 100644 src/libsystemd-network/dhcp-packet.c create mode 100644 src/libsystemd-network/dhcp-protocol.h create mode 100644 src/libsystemd-network/sd-dhcp-client.c create mode 100644 src/libsystemd-network/sd-dhcp-lease.c create mode 100644 src/libsystemd-network/test-dhcp-client.c create mode 100644 src/libsystemd-network/test-dhcp-option.c (limited to 'src/libsystemd-network') diff --git a/src/libsystemd-network/Makefile b/src/libsystemd-network/Makefile new file mode 120000 index 0000000000..d0b0e8e008 --- /dev/null +++ b/src/libsystemd-network/Makefile @@ -0,0 +1 @@ +../Makefile \ No newline at end of file diff --git a/src/libsystemd-network/dhcp-internal.h b/src/libsystemd-network/dhcp-internal.h new file mode 100644 index 0000000000..ce83b81631 --- /dev/null +++ b/src/libsystemd-network/dhcp-internal.h @@ -0,0 +1,55 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + Copyright (C) 2014 Tom Gundersen + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include + +#include "socket-util.h" + +#include "dhcp-protocol.h" + +int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link); +int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port); +int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link, + const void *packet, size_t len); +int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port, + const void *packet, size_t len); + +int dhcp_option_append(uint8_t **buf, size_t *buflen, uint8_t code, + size_t optlen, const void *optval); + +typedef int (*dhcp_option_cb_t)(uint8_t code, uint8_t len, + const uint8_t *option, void *user_data); + +int dhcp_option_parse(DHCPMessage *message, size_t len, + dhcp_option_cb_t cb, void *user_data); + +int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid, uint8_t type, + uint8_t **opt, size_t *optlen); + +void dhcp_packet_append_ip_headers(DHCPPacket *packet, uint16_t len); + +int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum); + +#define log_dhcp_client(client, fmt, ...) log_meta(LOG_DEBUG, __FILE__, __LINE__, __func__, "DHCP CLIENT: " fmt, ##__VA_ARGS__) diff --git a/src/libsystemd-network/dhcp-lease-internal.h b/src/libsystemd-network/dhcp-lease-internal.h new file mode 100644 index 0000000000..d12bcac247 --- /dev/null +++ b/src/libsystemd-network/dhcp-lease-internal.h @@ -0,0 +1,59 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + Copyright (C) 2014 Tom Gundersen + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include + +#include "refcnt.h" + +#include "dhcp-protocol.h" + +#include "sd-dhcp-client.h" + +struct sd_dhcp_lease { + RefCount n_ref; + + uint32_t t1; + uint32_t t2; + uint32_t lifetime; + be32_t address; + be32_t server_address; + be32_t subnet_mask; + be32_t router; + struct in_addr *dns; + size_t dns_size; + uint16_t mtu; + char *domainname; + char *hostname; +}; + +int dhcp_lease_new(sd_dhcp_lease **ret); +int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option, + void *user_data); + +int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file); +int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret); + +DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_lease*, sd_dhcp_lease_unref); +#define _cleanup_dhcp_lease_unref_ _cleanup_(sd_dhcp_lease_unrefp) diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c new file mode 100644 index 0000000000..934e8bf13e --- /dev/null +++ b/src/libsystemd-network/dhcp-network.c @@ -0,0 +1,109 @@ +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "socket-util.h" + +#include "dhcp-internal.h" + +int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link) +{ + int s, one = 1; + + assert(index > 0); + assert(link); + + s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, + htons(ETH_P_IP)); + if (s < 0) + return -errno; + + link->ll.sll_family = AF_PACKET; + link->ll.sll_protocol = htons(ETH_P_IP); + link->ll.sll_ifindex = index; + link->ll.sll_halen = ETH_ALEN; + memset(link->ll.sll_addr, 0xff, ETH_ALEN); + + if (setsockopt (s, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)) < 0) + return -errno; + + if (bind(s, &link->sa, sizeof(link->ll)) < 0) { + close_nointr_nofail(s); + return -errno; + } + + return s; +} + +int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port) +{ + int s; + union sockaddr_union src = { + .in.sin_family = AF_INET, + .in.sin_port = htobe16(port), + .in.sin_addr.s_addr = address, + }; + + s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); + if (s < 0) + return -errno; + + if (bind(s, &src.sa, sizeof(src.in)) < 0) { + close_nointr_nofail(s); + return -errno; + } + + return s; +} + +int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link, + const void *packet, size_t len) +{ + assert(link); + assert(packet); + assert(len); + + if (sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)) < 0) + return -errno; + + return 0; +} + +int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port, + const void *packet, size_t len) +{ + union sockaddr_union dest = { + .in.sin_family = AF_INET, + .in.sin_port = htobe16(port), + .in.sin_addr.s_addr = address, + }; + + if (sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)) < 0) + return -errno; + + return 0; +} diff --git a/src/libsystemd-network/dhcp-option.c b/src/libsystemd-network/dhcp-option.c new file mode 100644 index 0000000000..4d45b3b3a4 --- /dev/null +++ b/src/libsystemd-network/dhcp-option.c @@ -0,0 +1,184 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include + +#include "dhcp-internal.h" + +int dhcp_option_append(uint8_t **buf, size_t *buflen, uint8_t code, + size_t optlen, const void *optval) +{ + if (!buf || !buflen) + return -EINVAL; + + switch (code) { + + case DHCP_OPTION_PAD: + case DHCP_OPTION_END: + if (*buflen < 1) + return -ENOBUFS; + + (*buf)[0] = code; + *buf += 1; + *buflen -= 1; + break; + + default: + if (*buflen < optlen + 2) + return -ENOBUFS; + + if (!optval) + return -EINVAL; + + (*buf)[0] = code; + (*buf)[1] = optlen; + memcpy(&(*buf)[2], optval, optlen); + + *buf += optlen + 2; + *buflen -= (optlen + 2); + + break; + } + + return 0; +} + +static int parse_options(const uint8_t *buf, size_t buflen, uint8_t *overload, + uint8_t *message_type, dhcp_option_cb_t cb, + void *user_data) +{ + const uint8_t *code = buf; + const uint8_t *len; + + while (buflen > 0) { + switch (*code) { + case DHCP_OPTION_PAD: + buflen -= 1; + code++; + break; + + case DHCP_OPTION_END: + return 0; + + case DHCP_OPTION_MESSAGE_TYPE: + if (buflen < 3) + return -ENOBUFS; + buflen -= 3; + + len = code + 1; + if (*len != 1) + return -EINVAL; + + if (message_type) + *message_type = *(len + 1); + + code += 3; + + break; + + case DHCP_OPTION_OVERLOAD: + if (buflen < 3) + return -ENOBUFS; + buflen -= 3; + + len = code + 1; + if (*len != 1) + return -EINVAL; + + if (overload) + *overload = *(len + 1); + + code += 3; + + break; + + default: + if (buflen < 3) + return -ENOBUFS; + + len = code + 1; + + if (buflen < (size_t)*len + 2) + return -EINVAL; + buflen -= *len + 2; + + if (cb) + cb(*code, *len, len + 1, user_data); + + code += *len + 2; + + break; + } + } + + if (buflen) + return -EINVAL; + + return 0; +} + +int dhcp_option_parse(DHCPMessage *message, size_t len, + dhcp_option_cb_t cb, void *user_data) +{ + uint8_t overload = 0; + uint8_t message_type = 0; + uint8_t *opt = (uint8_t *)(message + 1); + int res; + + if (!message) + return -EINVAL; + + if (len < sizeof(DHCPMessage) + 4) + return -EINVAL; + + len -= sizeof(DHCPMessage) + 4; + + if (opt[0] != 0x63 && opt[1] != 0x82 && opt[2] != 0x53 && + opt[3] != 0x63) + return -EINVAL; + + res = parse_options(&opt[4], len, &overload, &message_type, + cb, user_data); + if (res < 0) + return res; + + if (overload & DHCP_OVERLOAD_FILE) { + res = parse_options(message->file, sizeof(message->file), + NULL, &message_type, cb, user_data); + if (res < 0) + return res; + } + + if (overload & DHCP_OVERLOAD_SNAME) { + res = parse_options(message->sname, sizeof(message->sname), + NULL, &message_type, cb, user_data); + if (res < 0) + return res; + } + + if (message_type) + return message_type; + + return -ENOMSG; +} diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c new file mode 100644 index 0000000000..95c4277f8c --- /dev/null +++ b/src/libsystemd-network/dhcp-packet.c @@ -0,0 +1,191 @@ +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + Copyright (C) 2014 Tom Gundersen + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include +#include +#include +#include + +#include "util.h" +#include "list.h" + +#include "dhcp-protocol.h" +#include "dhcp-lease-internal.h" +#include "dhcp-internal.h" +#include "sd-dhcp-lease.h" +#include "sd-dhcp-client.h" + +#define DHCP_CLIENT_MIN_OPTIONS_SIZE 312 + +int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid, + uint8_t type, uint8_t **opt, size_t *optlen) { + int err; + + assert(op == BOOTREQUEST || op == BOOTREPLY); + + *opt = (uint8_t *)(message + 1); + + if (*optlen < 4) + return -ENOBUFS; + *optlen -= 4; + + message->op = op; + message->htype = ARPHRD_ETHER; + message->hlen = ETHER_ADDR_LEN; + message->xid = htobe32(xid); + + (*opt)[0] = 0x63; + (*opt)[1] = 0x82; + (*opt)[2] = 0x53; + (*opt)[3] = 0x63; + + *opt += 4; + + err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1, + &type); + if (err < 0) + return err; + + return 0; +} + +static uint16_t dhcp_checksum(void *buf, int len) { + uint32_t sum; + uint16_t *check; + int i; + uint8_t *odd; + + sum = 0; + check = buf; + + for (i = 0; i < len / 2 ; i++) + sum += check[i]; + + if (len & 0x01) { + odd = buf; + sum += odd[len - 1]; + } + + while (sum >> 16) + sum = (sum & 0xffff) + (sum >> 16); + + return ~sum; +} + +void dhcp_packet_append_ip_headers(DHCPPacket *packet, uint16_t len) { + packet->ip.version = IPVERSION; + packet->ip.ihl = DHCP_IP_SIZE / 4; + packet->ip.tot_len = htobe16(len); + + packet->ip.protocol = IPPROTO_UDP; + packet->ip.saddr = INADDR_ANY; + packet->ip.daddr = INADDR_BROADCAST; + + packet->udp.source = htobe16(DHCP_PORT_CLIENT); + packet->udp.dest = htobe16(DHCP_PORT_SERVER); + + packet->udp.len = htobe16(len - DHCP_IP_SIZE); + + packet->ip.check = packet->udp.len; + packet->udp.check = dhcp_checksum(&packet->ip.ttl, len - 8); + + packet->ip.ttl = IPDEFTTL; + packet->ip.check = 0; + packet->ip.check = dhcp_checksum(&packet->ip, DHCP_IP_SIZE); +} + +int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) { + size_t hdrlen; + + assert(packet); + + /* IP */ + + if (len < DHCP_IP_SIZE) { + log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " + " smaller than IP header (%u bytes)", len, + DHCP_IP_SIZE); + return -EINVAL; + } + + if (packet->ip.ihl < 5) { + log_dhcp_client(client, "ignoring packet: IPv4 IHL (%u words) invalid", + packet->ip.ihl); + return -EINVAL; + } + + hdrlen = packet->ip.ihl * 4; + if (hdrlen < 20) { + log_dhcp_client(client, "ignoring packet: IPv4 IHL (%zu bytes) " + "smaller than minimum (20 bytes)", hdrlen); + return -EINVAL; + } + + if (len < hdrlen) { + log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " + "smaller than expected (%zu) by IP header", len, + hdrlen); + return -EINVAL; + } + + if (dhcp_checksum(&packet->ip, hdrlen)) { + log_dhcp_client(client, "ignoring packet: invalid IP checksum"); + return -EINVAL; + } + + /* UDP */ + + if (len < DHCP_IP_UDP_SIZE) { + log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " + " smaller than IP+UDP header (%u bytes)", len, + DHCP_IP_UDP_SIZE); + return -EINVAL; + } + + if (len < hdrlen + be16toh(packet->udp.len)) { + log_dhcp_client(client, "ignoring packet: packet (%zu bytes) " + "smaller than expected (%zu) by UDP header", len, + hdrlen + be16toh(packet->udp.len)); + return -EINVAL; + } + + if (checksum && packet->udp.check) { + packet->ip.check = packet->udp.len; + packet->ip.ttl = 0; + + if (dhcp_checksum(&packet->ip.ttl, + be16toh(packet->udp.len) + 12)) { + log_dhcp_client(client, "ignoring packet: invalid UDP checksum"); + return -EINVAL; + } + } + + if (be16toh(packet->udp.dest) != DHCP_PORT_CLIENT) { + log_dhcp_client(client, "ignoring packet: to port %u, which " + "is not the DHCP client port (%u)", + be16toh(packet->udp.dest), DHCP_PORT_CLIENT); + return -EINVAL; + } + + return 0; +} diff --git a/src/libsystemd-network/dhcp-protocol.h b/src/libsystemd-network/dhcp-protocol.h new file mode 100644 index 0000000000..81d36cef27 --- /dev/null +++ b/src/libsystemd-network/dhcp-protocol.h @@ -0,0 +1,121 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include + +#include "macro.h" +#include "sparse-endian.h" + +struct DHCPMessage { + uint8_t op; + uint8_t htype; + uint8_t hlen; + uint8_t hops; + be32_t xid; + be16_t secs; + be16_t flags; + be32_t ciaddr; + be32_t yiaddr; + be32_t siaddr; + be32_t giaddr; + uint8_t chaddr[16]; + uint8_t sname[64]; + uint8_t file[128]; +} _packed_; + +typedef struct DHCPMessage DHCPMessage; + +struct DHCPPacket { + struct iphdr ip; + struct udphdr udp; + DHCPMessage dhcp; +} _packed_; + +typedef struct DHCPPacket DHCPPacket; + +#define DHCP_IP_SIZE (int32_t)(sizeof(struct iphdr)) +#define DHCP_IP_UDP_SIZE (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE) +#define DHCP_MESSAGE_SIZE (int32_t)(sizeof(DHCPMessage)) +#define DHCP_MIN_OPTIONS_SIZE 312 + +enum { + DHCP_PORT_SERVER = 67, + DHCP_PORT_CLIENT = 68, +}; + +enum DHCPState { + DHCP_STATE_INIT = 0, + DHCP_STATE_SELECTING = 1, + DHCP_STATE_INIT_REBOOT = 2, + DHCP_STATE_REBOOTING = 3, + DHCP_STATE_REQUESTING = 4, + DHCP_STATE_BOUND = 5, + DHCP_STATE_RENEWING = 6, + DHCP_STATE_REBINDING = 7, +}; + +typedef enum DHCPState DHCPState; + +enum { + BOOTREQUEST = 1, + BOOTREPLY = 2, +}; + +enum { + DHCP_DISCOVER = 1, + DHCP_OFFER = 2, + DHCP_REQUEST = 3, + DHCP_DECLINE = 4, + DHCP_ACK = 5, + DHCP_NAK = 6, + DHCP_RELEASE = 7, +}; + +enum { + DHCP_OVERLOAD_FILE = 1, + DHCP_OVERLOAD_SNAME = 2, +}; + +enum { + DHCP_OPTION_PAD = 0, + DHCP_OPTION_SUBNET_MASK = 1, + DHCP_OPTION_ROUTER = 3, + DHCP_OPTION_DOMAIN_NAME_SERVER = 6, + DHCP_OPTION_HOST_NAME = 12, + DHCP_OPTION_DOMAIN_NAME = 15, + DHCP_OPTION_INTERFACE_MTU = 26, + DHCP_OPTION_NTP_SERVER = 42, + DHCP_OPTION_REQUESTED_IP_ADDRESS = 50, + DHCP_OPTION_IP_ADDRESS_LEASE_TIME = 51, + DHCP_OPTION_OVERLOAD = 52, + DHCP_OPTION_MESSAGE_TYPE = 53, + DHCP_OPTION_SERVER_IDENTIFIER = 54, + DHCP_OPTION_PARAMETER_REQUEST_LIST = 55, + DHCP_OPTION_MAXIMUM_MESSAGE_SIZE = 57, + DHCP_OPTION_RENEWAL_T1_TIME = 58, + DHCP_OPTION_REBINDING_T2_TIME = 59, + DHCP_OPTION_CLIENT_IDENTIFIER = 61, + DHCP_OPTION_END = 255, +}; diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c new file mode 100644 index 0000000000..1f676ccb65 --- /dev/null +++ b/src/libsystemd-network/sd-dhcp-client.c @@ -0,0 +1,1051 @@ +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include +#include +#include +#include + +#include "util.h" +#include "list.h" + +#include "dhcp-protocol.h" +#include "dhcp-internal.h" +#include "dhcp-lease-internal.h" +#include "sd-dhcp-client.h" + +struct sd_dhcp_client { + DHCPState state; + sd_event *event; + int event_priority; + sd_event_source *timeout_resend; + int index; + int fd; + union sockaddr_union link; + sd_event_source *receive_message; + uint8_t *req_opts; + size_t req_opts_allocated; + size_t req_opts_size; + be32_t last_addr; + struct ether_addr mac_addr; + uint32_t xid; + usec_t start_time; + uint16_t secs; + unsigned int attempt; + usec_t request_sent; + sd_event_source *timeout_t1; + sd_event_source *timeout_t2; + sd_event_source *timeout_expire; + sd_dhcp_client_cb_t cb; + void *userdata; + sd_dhcp_lease *lease; +}; + +static const uint8_t default_req_opts[] = { + DHCP_OPTION_SUBNET_MASK, + DHCP_OPTION_ROUTER, + DHCP_OPTION_HOST_NAME, + DHCP_OPTION_DOMAIN_NAME, + DHCP_OPTION_DOMAIN_NAME_SERVER, + DHCP_OPTION_NTP_SERVER, +}; + +static int client_receive_message_raw(sd_event_source *s, int fd, + uint32_t revents, void *userdata); +static int client_receive_message_udp(sd_event_source *s, int fd, + uint32_t revents, void *userdata); + +int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb, + void *userdata) { + assert_return(client, -EINVAL); + + client->cb = cb; + client->userdata = userdata; + + return 0; +} + +int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { + size_t i; + + assert_return(client, -EINVAL); + assert_return (client->state == DHCP_STATE_INIT, -EBUSY); + + switch(option) { + case DHCP_OPTION_PAD: + case DHCP_OPTION_OVERLOAD: + case DHCP_OPTION_MESSAGE_TYPE: + case DHCP_OPTION_PARAMETER_REQUEST_LIST: + case DHCP_OPTION_END: + return -EINVAL; + + default: + break; + } + + for (i = 0; i < client->req_opts_size; i++) + if (client->req_opts[i] == option) + return -EEXIST; + + if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, + client->req_opts_size + 1)) + return -ENOMEM; + + client->req_opts[client->req_opts_size++] = option; + + return 0; +} + +int sd_dhcp_client_set_request_address(sd_dhcp_client *client, + const struct in_addr *last_addr) { + assert_return(client, -EINVAL); + assert_return(client->state == DHCP_STATE_INIT, -EBUSY); + + if (last_addr) + client->last_addr = last_addr->s_addr; + else + client->last_addr = INADDR_ANY; + + return 0; +} + +int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) { + assert_return(client, -EINVAL); + assert_return(client->state == DHCP_STATE_INIT, -EBUSY); + assert_return(interface_index >= -1, -EINVAL); + + client->index = interface_index; + + return 0; +} + +int sd_dhcp_client_set_mac(sd_dhcp_client *client, + const struct ether_addr *addr) { + assert_return(client, -EINVAL); + assert_return(client->state == DHCP_STATE_INIT, -EBUSY); + + memcpy(&client->mac_addr, addr, ETH_ALEN); + + return 0; +} + +int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { + assert_return(client, -EINVAL); + assert_return(ret, -EINVAL); + + if (client->state != DHCP_STATE_BOUND && + client->state != DHCP_STATE_RENEWING && + client->state != DHCP_STATE_REBINDING) + return -EADDRNOTAVAIL; + + *ret = sd_dhcp_lease_ref(client->lease); + + return 0; +} + +static int client_notify(sd_dhcp_client *client, int event) { + if (client->cb) + client->cb(client, event, client->userdata); + + return 0; +} + +static int client_stop(sd_dhcp_client *client, int error) { + assert_return(client, -EINVAL); + + client->receive_message = + sd_event_source_unref(client->receive_message); + + if (client->fd >= 0) + close(client->fd); + client->fd = -1; + + client->timeout_resend = sd_event_source_unref(client->timeout_resend); + + client->timeout_t1 = sd_event_source_unref(client->timeout_t1); + client->timeout_t2 = sd_event_source_unref(client->timeout_t2); + client->timeout_expire = sd_event_source_unref(client->timeout_expire); + + client->attempt = 1; + + client_notify(client, error); + + client->start_time = 0; + client->secs = 0; + client->state = DHCP_STATE_INIT; + + if (client->lease) + client->lease = sd_dhcp_lease_unref(client->lease); + + log_dhcp_client(client, "STOPPED"); + + return 0; +} + +static int client_message_init(sd_dhcp_client *client, DHCPMessage *message, + uint8_t type, uint16_t secs, uint8_t **opt, + size_t *optlen) { + int r; + + assert(secs); + + r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt, + optlen); + if (r < 0) + return r; + + /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers + refuse to issue an DHCP lease if 'secs' is set to zero */ + message->secs = htobe16(secs); + + memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN); + + if (client->state == DHCP_STATE_RENEWING || + client->state == DHCP_STATE_REBINDING) + message->ciaddr = client->lease->address; + + /* Some DHCP servers will refuse to issue an DHCP lease if the Client + Identifier option is not set */ + r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER, + ETH_ALEN, &client->mac_addr); + if (r < 0) + return r; + + if (type == DHCP_DISCOVER || type == DHCP_REQUEST) { + be16_t max_size; + + r = dhcp_option_append(opt, optlen, + DHCP_OPTION_PARAMETER_REQUEST_LIST, + client->req_opts_size, + client->req_opts); + if (r < 0) + return r; + + /* Some DHCP servers will send bigger DHCP packets than the + defined default size unless the Maximum Messge Size option + is explicitely set */ + max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE + + DHCP_MIN_OPTIONS_SIZE); + r = dhcp_option_append(opt, optlen, + DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, + 2, &max_size); + if (r < 0) + return r; + } + + return 0; +} + +static int client_send_discover(sd_dhcp_client *client, uint16_t secs) { + int err = 0; + _cleanup_free_ DHCPPacket *discover; + size_t optlen, len; + uint8_t *opt; + + optlen = DHCP_MIN_OPTIONS_SIZE; + len = sizeof(DHCPPacket) + optlen; + + discover = malloc0(len); + + if (!discover) + return -ENOMEM; + + err = client_message_init(client, &discover->dhcp, DHCP_DISCOVER, + secs, &opt, &optlen); + if (err < 0) + return err; + + if (client->last_addr != INADDR_ANY) { + err = dhcp_option_append(&opt, &optlen, + DHCP_OPTION_REQUESTED_IP_ADDRESS, + 4, &client->last_addr); + if (err < 0) + return err; + } + + err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL); + if (err < 0) + return err; + + dhcp_packet_append_ip_headers(discover, len); + + err = dhcp_network_send_raw_socket(client->fd, &client->link, + discover, len); + + log_dhcp_client(client, "DISCOVER"); + + return err; +} + +static int client_send_request(sd_dhcp_client *client, uint16_t secs) { + _cleanup_free_ DHCPPacket *request; + size_t optlen, len; + int err; + uint8_t *opt; + + optlen = DHCP_MIN_OPTIONS_SIZE; + len = sizeof(DHCPPacket) + optlen; + + request = malloc0(len); + if (!request) + return -ENOMEM; + + err = client_message_init(client, &request->dhcp, DHCP_REQUEST, secs, + &opt, &optlen); + if (err < 0) + return err; + + if (client->state == DHCP_STATE_REQUESTING) { + err = dhcp_option_append(&opt, &optlen, + DHCP_OPTION_REQUESTED_IP_ADDRESS, + 4, &client->lease->address); + if (err < 0) + return err; + + err = dhcp_option_append(&opt, &optlen, + DHCP_OPTION_SERVER_IDENTIFIER, + 4, &client->lease->server_address); + if (err < 0) + return err; + } + + err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL); + if (err < 0) + return err; + + if (client->state == DHCP_STATE_RENEWING) { + err = dhcp_network_send_udp_socket(client->fd, + client->lease->server_address, + DHCP_PORT_SERVER, + &request->dhcp, + len - DHCP_IP_UDP_SIZE); + } else { + dhcp_packet_append_ip_headers(request, len); + + err = dhcp_network_send_raw_socket(client->fd, &client->link, + request, len); + } + + log_dhcp_client(client, "REQUEST"); + + return err; +} + +static uint16_t client_update_secs(sd_dhcp_client *client, usec_t time_now) +{ + client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; + + return client->secs; +} + +static int client_timeout_resend(sd_event_source *s, uint64_t usec, + void *userdata) { + sd_dhcp_client *client = userdata; + usec_t next_timeout = 0; + uint32_t time_left; + int r = 0; + + assert(s); + assert(client); + assert(client->event); + + switch (client->state) { + case DHCP_STATE_RENEWING: + + time_left = (client->lease->t2 - client->lease->t1) / 2; + if (time_left < 60) + time_left = 60; + + next_timeout = usec + time_left * USEC_PER_SEC; + + break; + + case DHCP_STATE_REBINDING: + + time_left = (client->lease->lifetime - client->lease->t2) / 2; + if (time_left < 60) + time_left = 60; + + next_timeout = usec + time_left * USEC_PER_SEC; + break; + + case DHCP_STATE_INIT: + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_SELECTING: + case DHCP_STATE_REQUESTING: + case DHCP_STATE_BOUND: + + if (client->attempt < 64) + client->attempt *= 2; + + next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC; + + break; + } + + next_timeout += (random_u32() & 0x1fffff); + + client->timeout_resend = sd_event_source_unref(client->timeout_resend); + + r = sd_event_add_monotonic(client->event, + &client->timeout_resend, + next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_resend, client); + if (r < 0) + goto error; + + r = sd_event_source_set_priority(client->timeout_resend, + client->event_priority); + if (r < 0) + goto error; + + switch (client->state) { + case DHCP_STATE_INIT: + + client_update_secs(client, usec); + + r = client_send_discover(client, client->secs); + if (r >= 0) { + client->state = DHCP_STATE_SELECTING; + client->attempt = 1; + } else { + if (client->attempt >= 64) + goto error; + } + + break; + + case DHCP_STATE_SELECTING: + client_update_secs(client, usec); + + r = client_send_discover(client, client->secs); + if (r < 0 && client->attempt >= 64) + goto error; + + break; + + case DHCP_STATE_REQUESTING: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + r = client_send_request(client, client->secs); + if (r < 0 && client->attempt >= 64) + goto error; + + client->request_sent = usec; + + break; + + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_BOUND: + + break; + } + + return 0; + +error: + client_stop(client, r); + + /* Errors were dealt with when stopping the client, don't spill + errors into the event loop handler */ + return 0; +} + +static int client_initialize_events(sd_dhcp_client *client, + sd_event_io_handler_t io_callback, + usec_t usec) { + int r; + + assert(client); + assert(client->event); + + r = sd_event_add_io(client->event, &client->receive_message, + client->fd, EPOLLIN, io_callback, + client); + if (r < 0) + goto error; + + r = sd_event_source_set_priority(client->receive_message, + client->event_priority); + if (r < 0) + goto error; + + client->timeout_resend = sd_event_source_unref(client->timeout_resend); + + r = sd_event_add_monotonic(client->event, + &client->timeout_resend, + usec, 0, + client_timeout_resend, client); + if (r < 0) + goto error; + + r = sd_event_source_set_priority(client->timeout_resend, + client->event_priority); + +error: + if (r < 0) + client_stop(client, r); + + return 0; + +} + +static int client_timeout_expire(sd_event_source *s, uint64_t usec, + void *userdata) { + sd_dhcp_client *client = userdata; + + log_dhcp_client(client, "EXPIRED"); + + client_stop(client, DHCP_EVENT_EXPIRED); + + return 0; +} + +static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { + sd_dhcp_client *client = userdata; + int r; + + if (client->fd >= 0) { + client->receive_message = + sd_event_source_unref(client->receive_message); + close(client->fd); + client->fd = -1; + } + + client->state = DHCP_STATE_REBINDING; + client->attempt = 1; + + r = dhcp_network_bind_raw_socket(client->index, &client->link); + if (r < 0) { + client_stop(client, r); + return 0; + } + + client->fd = r; + + log_dhcp_client(client, "TIMEOUT T2"); + + return client_initialize_events(client, client_receive_message_raw, + usec); +} + +static int client_timeout_t1(sd_event_source *s, uint64_t usec, + void *userdata) { + sd_dhcp_client *client = userdata; + int r; + + client->state = DHCP_STATE_RENEWING; + client->attempt = 1; + + r = dhcp_network_bind_udp_socket(client->index, + client->lease->address, + DHCP_PORT_CLIENT); + if (r < 0) { + client_stop(client, r); + return 0; + } + + client->fd = r; + + log_dhcp_client(client, "TIMEOUT T1"); + + return client_initialize_events(client, client_receive_message_udp, usec); +} + +static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, + size_t len) { + _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; + int r; + + r = dhcp_lease_new(&lease); + if (r < 0) + return r; + + r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease); + if (r != DHCP_OFFER) + return -ENOMSG; + + lease->address = offer->yiaddr; + + if (lease->address == INADDR_ANY || + lease->server_address == INADDR_ANY || + lease->subnet_mask == INADDR_ANY || + lease->lifetime == 0) + return -ENOMSG; + + client->lease = lease; + lease = NULL; + + log_dhcp_client(client, "OFFER"); + + return 0; +} + +static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, + size_t len) { + _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; + int r; + + r = dhcp_lease_new(&lease); + if (r < 0) + return r; + + r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease); + if (r == DHCP_NAK) { + log_dhcp_client(client, "NAK"); + return DHCP_EVENT_NO_LEASE; + } + + if (r != DHCP_ACK) + return -ENOMSG; + + lease->address = ack->yiaddr; + + if (lease->address == INADDR_ANY || + lease->server_address == INADDR_ANY || + lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) + return -ENOMSG; + + r = DHCP_EVENT_IP_ACQUIRE; + if (client->lease) { + if (client->lease->address != lease->address || + client->lease->subnet_mask != lease->subnet_mask || + client->lease->router != lease->router) { + r = DHCP_EVENT_IP_CHANGE; + } + + client->lease = sd_dhcp_lease_unref(client->lease); + } + + client->lease = lease; + lease = NULL; + + log_dhcp_client(client, "ACK"); + + return r; +} + +static uint64_t client_compute_timeout(uint64_t request_sent, + uint32_t lifetime) { + return request_sent + (lifetime - 3) * USEC_PER_SEC + + + (random_u32() & 0x1fffff); +} + +static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) { + uint64_t next_timeout; + int r; + + assert(client); + assert(client->event); + + if (client->lease->lifetime < 10) + return -EINVAL; + + client->timeout_t1 = sd_event_source_unref(client->timeout_t1); + client->timeout_t2 = sd_event_source_unref(client->timeout_t2); + client->timeout_expire = sd_event_source_unref(client->timeout_expire); + + if (!client->lease->t1) + client->lease->t1 = client->lease->lifetime / 2; + + next_timeout = client_compute_timeout(client->request_sent, + client->lease->t1); + if (next_timeout < usec) + return -EINVAL; + + r = sd_event_add_monotonic(client->event, + &client->timeout_t1, + next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_t1, client); + if (r < 0) + return r; + + r = sd_event_source_set_priority(client->timeout_t1, + client->event_priority); + if (r < 0) + return r; + + if (!client->lease->t2) + client->lease->t2 = client->lease->lifetime * 7 / 8; + + if (client->lease->t2 < client->lease->t1) + return -EINVAL; + + if (client->lease->lifetime < client->lease->t2) + return -EINVAL; + + next_timeout = client_compute_timeout(client->request_sent, + client->lease->t2); + if (next_timeout < usec) + return -EINVAL; + + r = sd_event_add_monotonic(client->event, + &client->timeout_t2, + next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_t2, client); + if (r < 0) + return r; + + r = sd_event_source_set_priority(client->timeout_t2, + client->event_priority); + if (r < 0) + return r; + + next_timeout = client_compute_timeout(client->request_sent, + client->lease->lifetime); + if (next_timeout < usec) + return -EINVAL; + + r = sd_event_add_monotonic(client->event, + &client->timeout_expire, next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_expire, client); + if (r < 0) + return r; + + r = sd_event_source_set_priority(client->timeout_expire, + client->event_priority); + if (r < 0) + return r; + + return 0; +} + +static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, + int len, usec_t time_now) { + int r = 0, notify_event = 0; + + assert(client); + assert(client->event); + assert(message); + + if (len < DHCP_MESSAGE_SIZE) { + log_dhcp_client(client, "message too small (%d bytes): " + "ignoring", len); + return 0; + } + + if (message->op != BOOTREPLY) { + log_dhcp_client(client, "not a BOOTREPLY message: ignoring"); + return 0; + } + + if (be32toh(message->xid) != client->xid) { + log_dhcp_client(client, "received xid (%u) does not match " + "expected (%u): ignoring", + be32toh(message->xid), client->xid); + return 0; + } + + if (memcmp(&message->chaddr[0], &client->mac_addr.ether_addr_octet, + ETHER_ADDR_LEN)) { + log_dhcp_client(client, "received chaddr does not match " + "expected: ignoring"); + return 0; + } + + switch (client->state) { + case DHCP_STATE_SELECTING: + + r = client_handle_offer(client, message, len); + if (r >= 0) { + + client->timeout_resend = + sd_event_source_unref(client->timeout_resend); + + client->state = DHCP_STATE_REQUESTING; + client->attempt = 1; + + r = sd_event_add_monotonic(client->event, + &client->timeout_resend, + time_now, 0, + client_timeout_resend, + client); + if (r < 0) + goto error; + + r = sd_event_source_set_priority(client->timeout_resend, + client->event_priority); + if (r < 0) + goto error; + } + + break; + + case DHCP_STATE_REQUESTING: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + + r = client_handle_ack(client, message, len); + + if (r == DHCP_EVENT_NO_LEASE) + goto error; + + if (r >= 0) { + client->timeout_resend = + sd_event_source_unref(client->timeout_resend); + + if (client->state == DHCP_STATE_REQUESTING) + notify_event = DHCP_EVENT_IP_ACQUIRE; + else if (r != DHCP_EVENT_IP_ACQUIRE) + notify_event = r; + + client->state = DHCP_STATE_BOUND; + client->attempt = 1; + + client->last_addr = client->lease->address; + + r = client_set_lease_timeouts(client, time_now); + if (r < 0) + goto error; + + if (notify_event) + client_notify(client, notify_event); + + client->receive_message = + sd_event_source_unref(client->receive_message); + close(client->fd); + client->fd = -1; + } + + r = 0; + + break; + + case DHCP_STATE_INIT: + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_BOUND: + + break; + } + +error: + if (r < 0 || r == DHCP_EVENT_NO_LEASE) + return client_stop(client, r); + + return 0; +} + +static int client_receive_message_udp(sd_event_source *s, int fd, + uint32_t revents, void *userdata) { + sd_dhcp_client *client = userdata; + _cleanup_free_ DHCPMessage *message = NULL; + int buflen = 0, len, r; + usec_t time_now; + + assert(s); + assert(client); + assert(client->event); + + r = ioctl(fd, FIONREAD, &buflen); + if (r < 0 || buflen <= 0) + buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE; + + message = malloc0(buflen); + if (!message) + return -ENOMEM; + + len = read(fd, message, buflen); + if (len < 0) + return 0; + + r = sd_event_get_now_monotonic(client->event, &time_now); + if (r < 0) + return client_stop(client, r); + + return client_handle_message(client, message, len, + time_now); +} + +static int client_receive_message_raw(sd_event_source *s, int fd, + uint32_t revents, void *userdata) { + sd_dhcp_client *client = userdata; + _cleanup_free_ DHCPPacket *packet = NULL; + usec_t time_now; + uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; + struct iovec iov = {}; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = cmsgbuf, + .msg_controllen = sizeof(cmsgbuf), + }; + struct cmsghdr *cmsg; + bool checksum = true; + int buflen = 0, len, r; + + assert(s); + assert(client); + assert(client->event); + + r = ioctl(fd, FIONREAD, &buflen); + if (r < 0 || buflen <= 0) + buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE; + + packet = malloc0(buflen); + if (!packet) + return -ENOMEM; + + iov.iov_base = packet; + iov.iov_len = buflen; + + len = recvmsg(fd, &msg, 0); + if (len < 0) { + log_dhcp_client(client, "could not receive message from raw " + "socket: %s", strerror(errno)); + return 0; + } + + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { + if (cmsg->cmsg_level == SOL_PACKET && cmsg->cmsg_type == PACKET_AUXDATA) { + struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg); + + checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); + break; + } + } + + r = dhcp_packet_verify_headers(packet, len, checksum); + if (r < 0) + return 0; + + len -= DHCP_IP_UDP_SIZE; + + r = sd_event_get_now_monotonic(client->event, &time_now); + if (r < 0) + return client_stop(client, r); + + return client_handle_message(client, &packet->dhcp, len, time_now); +} + +int sd_dhcp_client_start(sd_dhcp_client *client) { + int r; + + assert_return(client, -EINVAL); + assert_return(client->event, -EINVAL); + assert_return(client->index > 0, -EINVAL); + assert_return(client->state == DHCP_STATE_INIT || + client->state == DHCP_STATE_INIT_REBOOT, -EBUSY); + + client->xid = random_u32(); + + r = dhcp_network_bind_raw_socket(client->index, &client->link); + + if (r < 0) { + client_stop(client, r); + return r; + } + + client->fd = r; + client->start_time = now(CLOCK_MONOTONIC); + client->secs = 0; + + log_dhcp_client(client, "STARTED"); + + return client_initialize_events(client, client_receive_message_raw, + client->start_time); +} + +int sd_dhcp_client_stop(sd_dhcp_client *client) { + return client_stop(client, DHCP_EVENT_STOP); +} + +int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, + int priority) { + int r; + + assert_return(client, -EINVAL); + assert_return(!client->event, -EBUSY); + + if (event) + client->event = sd_event_ref(event); + else { + r = sd_event_default(&client->event); + if (r < 0) + return 0; + } + + client->event_priority = priority; + + return 0; +} + +int sd_dhcp_client_detach_event(sd_dhcp_client *client) { + assert_return(client, -EINVAL); + + client->event = sd_event_unref(client->event); + + return 0; +} + +sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { + if (!client) + return NULL; + + return client->event; +} + +void sd_dhcp_client_free(sd_dhcp_client *client) { + if (!client) + return; + + sd_dhcp_client_stop(client); + sd_dhcp_client_detach_event(client); + + free(client->req_opts); + free(client); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free); +#define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep) + +int sd_dhcp_client_new(sd_dhcp_client **ret) { + _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL; + + assert_return(ret, -EINVAL); + + client = new0(sd_dhcp_client, 1); + if (!client) + return -ENOMEM; + + client->state = DHCP_STATE_INIT; + client->index = -1; + client->fd = -1; + client->attempt = 1; + + client->req_opts_size = ELEMENTSOF(default_req_opts); + + client->req_opts = memdup(default_req_opts, client->req_opts_size); + if (!client->req_opts) + return -ENOMEM; + + *ret = client; + client = NULL; + + return 0; +} diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c new file mode 100644 index 0000000000..0529b6d8fa --- /dev/null +++ b/src/libsystemd-network/sd-dhcp-lease.c @@ -0,0 +1,401 @@ +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + Copyright (C) 2014 Tom Gundersen + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include +#include +#include +#include + +#include "util.h" +#include "list.h" +#include "mkdir.h" +#include "fileio.h" + +#include "dhcp-protocol.h" +#include "dhcp-internal.h" +#include "dhcp-lease-internal.h" +#include "sd-dhcp-lease.h" +#include "sd-dhcp-client.h" + +int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + + addr->s_addr = lease->address; + + return 0; +} + +int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) { + assert_return(lease, -EINVAL); + assert_return(mtu, -EINVAL); + + if (lease->mtu) + *mtu = lease->mtu; + else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + assert_return(addr_size, -EINVAL); + + if (lease->dns_size) { + *addr_size = lease->dns_size; + *addr = lease->dns; + } else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) { + assert_return(lease, -EINVAL); + assert_return(domainname, -EINVAL); + + if (lease->domainname) + *domainname = lease->domainname; + else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) { + assert_return(lease, -EINVAL); + assert_return(hostname, -EINVAL); + + if (lease->hostname) + *hostname = lease->hostname; + else + return -ENOENT; + + return 0; +} + +int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + + addr->s_addr = lease->router; + + return 0; +} + +int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) { + assert_return(lease, -EINVAL); + assert_return(addr, -EINVAL); + + addr->s_addr = lease->subnet_mask; + + return 0; +} + +sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) { + if (lease) + assert_se(REFCNT_INC(lease->n_ref) >= 2); + + return lease; +} + +sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) { + if (lease && REFCNT_DEC(lease->n_ref) <= 0) { + free(lease->hostname); + free(lease->domainname); + free(lease->dns); + free(lease); + } + + return NULL; +} + +int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option, + void *user_data) { + sd_dhcp_lease *lease = user_data; + be32_t val; + + switch(code) { + + case DHCP_OPTION_IP_ADDRESS_LEASE_TIME: + if (len == 4) { + memcpy(&val, option, 4); + lease->lifetime = be32toh(val); + } + + break; + + case DHCP_OPTION_SERVER_IDENTIFIER: + if (len >= 4) + memcpy(&lease->server_address, option, 4); + + break; + + case DHCP_OPTION_SUBNET_MASK: + if (len >= 4) + memcpy(&lease->subnet_mask, option, 4); + + break; + + case DHCP_OPTION_ROUTER: + if (len >= 4) + memcpy(&lease->router, option, 4); + + break; + + case DHCP_OPTION_DOMAIN_NAME_SERVER: + if (len && !(len % 4)) { + unsigned i; + + lease->dns_size = len / 4; + + free(lease->dns); + lease->dns = new0(struct in_addr, lease->dns_size); + if (!lease->dns) + return -ENOMEM; + + for (i = 0; i < lease->dns_size; i++) { + memcpy(&lease->dns[i].s_addr, option + 4 * i, 4); + } + } + + break; + + case DHCP_OPTION_INTERFACE_MTU: + if (len >= 2) { + be16_t mtu; + + memcpy(&mtu, option, 2); + lease->mtu = be16toh(mtu); + + if (lease->mtu < 68) + lease->mtu = 0; + } + + break; + + case DHCP_OPTION_DOMAIN_NAME: + if (len >= 1) { + free(lease->domainname); + lease->domainname = strndup((const char *)option, len); + } + + break; + + case DHCP_OPTION_HOST_NAME: + if (len >= 1) { + free(lease->hostname); + lease->hostname = strndup((const char *)option, len); + } + + break; + + case DHCP_OPTION_RENEWAL_T1_TIME: + if (len == 4) { + memcpy(&val, option, 4); + lease->t1 = be32toh(val); + } + + break; + + case DHCP_OPTION_REBINDING_T2_TIME: + if (len == 4) { + memcpy(&val, option, 4); + lease->t2 = be32toh(val); + } + + break; + } + + return 0; +} + +int dhcp_lease_new(sd_dhcp_lease **ret) { + _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; + + lease = new0(sd_dhcp_lease, 1); + if (!lease) + return -ENOMEM; + + lease->n_ref = REFCNT_INIT; + + *ret = lease; + lease = NULL; + + return 0; +} + +int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) { + _cleanup_free_ char *temp_path = NULL; + _cleanup_fclose_ FILE *f = NULL; + char buf[INET_ADDRSTRLEN]; + struct in_addr address; + const char *string; + uint16_t mtu; + int r; + + assert(lease); + assert(lease_file); + + r = mkdir_safe_label("/run/systemd/network/leases", 0755, 0, 0); + if (r < 0) + goto finish; + + r = fopen_temporary(lease_file, &f, &temp_path); + if (r < 0) + goto finish; + + fchmod(fileno(f), 0644); + + r = sd_dhcp_lease_get_address(lease, &address); + if (r < 0) + goto finish; + + string = inet_ntop(AF_INET, &address, buf, INET_ADDRSTRLEN); + if (!string) { + r = -errno; + goto finish; + } + + fprintf(f, + "# This is private data. Do not parse.\n" + "ADDRESS=%s\n", string); + + r = sd_dhcp_lease_get_router(lease, &address); + if (r < 0) + goto finish; + + string = inet_ntop(AF_INET, &address, buf, INET_ADDRSTRLEN); + if (!string) { + r = -errno; + goto finish; + } + + fprintf(f, + "ROUTER=%s\n", string); + + r = sd_dhcp_lease_get_netmask(lease, &address); + if (r < 0) + goto finish; + + string = inet_ntop(AF_INET, &address, buf, INET_ADDRSTRLEN); + if (!string) { + r = -errno; + goto finish; + } + + fprintf(f, + "NETMASK=%s\n", string); + + r = sd_dhcp_lease_get_mtu(lease, &mtu); + if (r >= 0) + fprintf(f, "MTU=%" PRIu16 "\n", mtu); + +/* TODO: DNS. See resolv.conf writing in network-manager.c */ + + r = sd_dhcp_lease_get_domainname(lease, &string); + if (r >= 0) + fprintf(f, "DOMAINNAME=%s\n", string); + + r = sd_dhcp_lease_get_hostname(lease, &string); + if (r >= 0) + fprintf(f, "HOSTNAME=%s\n", string); + + r = 0; + + fflush(f); + + if (ferror(f) || rename(temp_path, lease_file) < 0) { + r = -errno; + unlink(lease_file); + unlink(temp_path); + } + +finish: + if (r < 0) + log_error("Failed to save lease data %s: %s", lease_file, strerror(-r)); + + return r; +} + +int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) { + _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; + _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL, + *mtu = NULL; + struct in_addr addr; + int r; + + assert(lease_file); + assert(ret); + + r = dhcp_lease_new(&lease); + if (r < 0) + return r; + + r = parse_env_file(lease_file, NEWLINE, + "ADDRESS", &address, + "ROUTER", &router, + "NETMASK", &netmask, + "MTU", &mtu, + "DOMAINNAME", &lease->domainname, + "HOSTNAME", &lease->hostname, + NULL); + if (r < 0) { + if (r == -ENOENT) + return 0; + + log_error("Failed to read %s: %s", lease_file, strerror(-r)); + return r; + } + + r = inet_pton(AF_INET, address, &addr); + if (r < 0) + return r; + + lease->address = addr.s_addr; + + r = inet_pton(AF_INET, router, &addr); + if (r < 0) + return r; + + lease->router = addr.s_addr; + + r = inet_pton(AF_INET, netmask, &addr); + if (r < 0) + return r; + + lease->subnet_mask = addr.s_addr; + + if (mtu) { + uint16_t u; + if (sscanf(mtu, "%" SCNu16, &u) > 0) + lease->mtu = u; + } + + *ret = lease; + lease = NULL; + + return 0; +} diff --git a/src/libsystemd-network/test-dhcp-client.c b/src/libsystemd-network/test-dhcp-client.c new file mode 100644 index 0000000000..8061e5fa83 --- /dev/null +++ b/src/libsystemd-network/test-dhcp-client.c @@ -0,0 +1,496 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright (C) 2013 Intel Corporation. All rights reserved. + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include +#include +#include +#include + +#include "util.h" +#include "socket-util.h" + +#include "dhcp-protocol.h" +#include "dhcp-internal.h" +#include "sd-dhcp-client.h" + +static struct ether_addr mac_addr = { + .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'} +}; + +typedef int (*test_callback_recv_t)(size_t size, DHCPMessage *dhcp); + +static bool verbose = false; +static int test_fd[2]; +static test_callback_recv_t callback_recv; +static be32_t xid; + +static void test_request_basic(sd_event *e) +{ + int r; + + sd_dhcp_client *client; + + if (verbose) + printf("* %s\n", __FUNCTION__); + + r = sd_dhcp_client_new(&client); + + assert_se(r >= 0); + assert_se(client); + + r = sd_dhcp_client_attach_event(client, e, 0); + assert_se(r >= 0); + + assert_se(sd_dhcp_client_set_request_option(NULL, 0) == -EINVAL); + assert_se(sd_dhcp_client_set_request_address(NULL, NULL) == -EINVAL); + assert_se(sd_dhcp_client_set_index(NULL, 0) == -EINVAL); + + assert_se(sd_dhcp_client_set_index(client, 15) == 0); + assert_se(sd_dhcp_client_set_index(client, -42) == -EINVAL); + assert_se(sd_dhcp_client_set_index(client, -1) == 0); + + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_SUBNET_MASK) == -EEXIST); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_ROUTER) == -EEXIST); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_HOST_NAME) == -EEXIST); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_DOMAIN_NAME) == -EEXIST); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_DOMAIN_NAME_SERVER) + == -EEXIST); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_NTP_SERVER) == -EEXIST); + + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_PAD) == -EINVAL); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_END) == -EINVAL); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_MESSAGE_TYPE) == -EINVAL); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_OVERLOAD) == -EINVAL); + assert_se(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_PARAMETER_REQUEST_LIST) + == -EINVAL); + + assert_se(sd_dhcp_client_set_request_option(client, 33) == 0); + assert_se(sd_dhcp_client_set_request_option(client, 33) == -EEXIST); + assert_se(sd_dhcp_client_set_request_option(client, 44) == 0); + assert_se(sd_dhcp_client_set_request_option(client, 33) == -EEXIST); +} + +static uint16_t client_checksum(void *buf, int len) +{ + uint32_t sum; + uint16_t *check; + int i; + uint8_t *odd; + + sum = 0; + check = buf; + + for (i = 0; i < len / 2 ; i++) + sum += check[i]; + + if (len & 0x01) { + odd = buf; + sum += odd[len - 1]; + } + + while (sum >> 16) + sum = (sum & 0xffff) + (sum >> 16); + + return ~sum; +} + +static void test_checksum(void) +{ + uint8_t buf[20] = { + 0x45, 0x00, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00, + 0x40, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0xff, 0xff, 0xff, 0xff + }; + + if (verbose) + printf("* %s\n", __FUNCTION__); + + assert_se(client_checksum(&buf, 20) == be16toh(0x78ae)); +} + +static int check_options(uint8_t code, uint8_t len, const uint8_t *option, + void *user_data) +{ + return 0; +} + +int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link, + const void *packet, size_t len) +{ + size_t size; + _cleanup_free_ DHCPPacket *discover; + uint16_t ip_check, udp_check; + + assert_se(s >= 0); + assert_se(packet); + + size = sizeof(DHCPPacket) + 4; + assert_se(len > size); + + discover = memdup(packet, len); + + assert_se(discover->ip.ttl == IPDEFTTL); + assert_se(discover->ip.protocol == IPPROTO_UDP); + assert_se(discover->ip.saddr == INADDR_ANY); + assert_se(discover->ip.daddr == INADDR_BROADCAST); + assert_se(discover->udp.source == be16toh(DHCP_PORT_CLIENT)); + assert_se(discover->udp.dest == be16toh(DHCP_PORT_SERVER)); + + ip_check = discover->ip.check; + + discover->ip.ttl = 0; + discover->ip.check = discover->udp.len; + + udp_check = ~client_checksum(&discover->ip.ttl, len - 8); + assert_se(udp_check == 0xffff); + + discover->ip.ttl = IPDEFTTL; + discover->ip.check = ip_check; + + ip_check = ~client_checksum(&discover->ip, sizeof(discover->ip)); + assert_se(ip_check == 0xffff); + + assert_se(discover->dhcp.xid); + assert_se(memcmp(discover->dhcp.chaddr, + &mac_addr.ether_addr_octet, 6) == 0); + + size = len - sizeof(struct iphdr) - sizeof(struct udphdr); + + assert_se(callback_recv); + callback_recv(size, &discover->dhcp); + + return 575; +} + +int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link) +{ + if (socketpair(AF_UNIX, SOCK_STREAM, 0, test_fd) < 0) + return -errno; + + return test_fd[0]; +} + +int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port) +{ + return 0; +} + +int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port, + const void *packet, size_t len) +{ + return 0; +} + +static int test_discover_message_verify(size_t size, struct DHCPMessage *dhcp) +{ + int res; + + res = dhcp_option_parse(dhcp, size, check_options, NULL); + assert_se(res == DHCP_DISCOVER); + + if (verbose) + printf(" recv DHCP Discover 0x%08x\n", be32toh(dhcp->xid)); + + return 0; +} + +static void test_discover_message(sd_event *e) +{ + sd_dhcp_client *client; + int res, r; + + if (verbose) + printf("* %s\n", __FUNCTION__); + + r = sd_dhcp_client_new(&client); + assert_se(r >= 0); + assert_se(client); + + r = sd_dhcp_client_attach_event(client, e, 0); + assert_se(r >= 0); + + assert_se(sd_dhcp_client_set_index(client, 42) >= 0); + assert_se(sd_dhcp_client_set_mac(client, &mac_addr) >= 0); + + assert_se(sd_dhcp_client_set_request_option(client, 248) >= 0); + + callback_recv = test_discover_message_verify; + + res = sd_dhcp_client_start(client); + + assert_se(res == 0 || res == -EINPROGRESS); + + sd_event_run(e, (uint64_t) -1); + + sd_dhcp_client_stop(client); + sd_dhcp_client_free(client); + + close(test_fd[0]); + close(test_fd[1]); + + callback_recv = NULL; +} + +static uint8_t test_addr_acq_offer[] = { + 0x45, 0x10, 0x01, 0x48, 0x00, 0x00, 0x00, 0x00, + 0x80, 0x11, 0xb3, 0x84, 0xc0, 0xa8, 0x02, 0x01, + 0xc0, 0xa8, 0x02, 0xbf, 0x00, 0x43, 0x00, 0x44, + 0x01, 0x34, 0x00, 0x00, 0x02, 0x01, 0x06, 0x00, + 0x6f, 0x95, 0x2f, 0x30, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0xc0, 0xa8, 0x02, 0xbf, + 0xc0, 0xa8, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x63, 0x82, 0x53, 0x63, 0x35, 0x01, 0x02, 0x36, + 0x04, 0xc0, 0xa8, 0x02, 0x01, 0x33, 0x04, 0x00, + 0x00, 0x02, 0x58, 0x01, 0x04, 0xff, 0xff, 0xff, + 0x00, 0x2a, 0x04, 0xc0, 0xa8, 0x02, 0x01, 0x0f, + 0x09, 0x6c, 0x61, 0x62, 0x2e, 0x69, 0x6e, 0x74, + 0x72, 0x61, 0x03, 0x04, 0xc0, 0xa8, 0x02, 0x01, + 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +}; + +static uint8_t test_addr_acq_ack[] = { + 0x45, 0x10, 0x01, 0x48, 0x00, 0x00, 0x00, 0x00, + 0x80, 0x11, 0xb3, 0x84, 0xc0, 0xa8, 0x02, 0x01, + 0xc0, 0xa8, 0x02, 0xbf, 0x00, 0x43, 0x00, 0x44, + 0x01, 0x34, 0x00, 0x00, 0x02, 0x01, 0x06, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0xc0, 0xa8, 0x02, 0xbf, + 0xc0, 0xa8, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x63, 0x82, 0x53, 0x63, 0x35, 0x01, 0x05, 0x36, + 0x04, 0xc0, 0xa8, 0x02, 0x01, 0x33, 0x04, 0x00, + 0x00, 0x02, 0x58, 0x01, 0x04, 0xff, 0xff, 0xff, + 0x00, 0x2a, 0x04, 0xc0, 0xa8, 0x02, 0x01, 0x0f, + 0x09, 0x6c, 0x61, 0x62, 0x2e, 0x69, 0x6e, 0x74, + 0x72, 0x61, 0x03, 0x04, 0xc0, 0xa8, 0x02, 0x01, + 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +}; + +static void test_addr_acq_acquired(sd_dhcp_client *client, int event, + void *userdata) +{ + sd_event *e = userdata; + sd_dhcp_lease *lease; + struct in_addr addr; + + assert_se(client); + assert_se(event == DHCP_EVENT_IP_ACQUIRE); + + assert_se(sd_dhcp_client_get_lease(client, &lease) >= 0); + assert_se(lease); + + assert_se(sd_dhcp_lease_get_address(lease, &addr) >= 0); + assert_se(memcmp(&addr.s_addr, &test_addr_acq_ack[44], + sizeof(addr.s_addr)) == 0); + + assert_se(sd_dhcp_lease_get_netmask(lease, &addr) >= 0); + assert_se(memcmp(&addr.s_addr, &test_addr_acq_ack[285], + sizeof(addr.s_addr)) == 0); + + assert_se(sd_dhcp_lease_get_router(lease, &addr) >= 0); + assert_se(memcmp(&addr.s_addr, &test_addr_acq_ack[308], + sizeof(addr.s_addr)) == 0); + + if (verbose) + printf(" DHCP address acquired\n"); + + sd_event_exit(e, 0); +} + +static int test_addr_acq_recv_request(size_t size, DHCPMessage *request) +{ + uint16_t udp_check = 0; + int res; + + res = dhcp_option_parse(request, size, check_options, NULL); + assert_se(res == DHCP_REQUEST); + assert_se(xid == request->xid); + + if (verbose) + printf(" recv DHCP Request 0x%08x\n", be32toh(xid)); + + memcpy(&test_addr_acq_ack[26], &udp_check, sizeof(udp_check)); + memcpy(&test_addr_acq_ack[32], &xid, sizeof(xid)); + memcpy(&test_addr_acq_ack[56], &mac_addr.ether_addr_octet, + ETHER_ADDR_LEN); + + callback_recv = NULL; + + res = write(test_fd[1], test_addr_acq_ack, + sizeof(test_addr_acq_ack)); + assert_se(res == sizeof(test_addr_acq_ack)); + + if (verbose) + printf(" send DHCP Ack\n"); + + return 0; +}; + +static int test_addr_acq_recv_discover(size_t size, DHCPMessage *discover) +{ + uint16_t udp_check = 0; + int res; + + res = dhcp_option_parse(discover, size, check_options, NULL); + assert_se(res == DHCP_DISCOVER); + + xid = discover->xid; + + if (verbose) + printf(" recv DHCP Discover 0x%08x\n", be32toh(xid)); + + memcpy(&test_addr_acq_offer[26], &udp_check, sizeof(udp_check)); + memcpy(&test_addr_acq_offer[32], &xid, sizeof(xid)); + memcpy(&test_addr_acq_offer[56], &mac_addr.ether_addr_octet, + ETHER_ADDR_LEN); + + callback_recv = test_addr_acq_recv_request; + + res = write(test_fd[1], test_addr_acq_offer, + sizeof(test_addr_acq_offer)); + assert_se(res == sizeof(test_addr_acq_offer)); + + if (verbose) + printf(" send DHCP Offer\n"); + + return 0; +} + +static void test_addr_acq(sd_event *e) +{ + sd_dhcp_client *client; + int res, r; + + if (verbose) + printf("* %s\n", __FUNCTION__); + + r = sd_dhcp_client_new(&client); + assert_se(r >= 0); + assert_se(client); + + r = sd_dhcp_client_attach_event(client, e, 0); + assert_se(r >= 0); + + assert_se(sd_dhcp_client_set_index(client, 42) >= 0); + assert_se(sd_dhcp_client_set_mac(client, &mac_addr) >= 0); + + assert_se(sd_dhcp_client_set_callback(client, test_addr_acq_acquired, e) + >= 0); + + callback_recv = test_addr_acq_recv_discover; + + res = sd_dhcp_client_start(client); + assert_se(res == 0 || res == -EINPROGRESS); + + sd_event_loop(e); + + sd_dhcp_client_set_callback(client, NULL, NULL); + sd_dhcp_client_stop(client); + sd_dhcp_client_free(client); + + close(test_fd[0]); + close(test_fd[1]); + + callback_recv = NULL; + xid = 0; +} + +int main(int argc, char *argv[]) +{ + sd_event *e; + + assert_se(sd_event_new(&e) >= 0); + + test_request_basic(e); + test_checksum(); + + test_discover_message(e); + test_addr_acq(e); + + return 0; +} diff --git a/src/libsystemd-network/test-dhcp-option.c b/src/libsystemd-network/test-dhcp-option.c new file mode 100644 index 0000000000..8659fd5025 --- /dev/null +++ b/src/libsystemd-network/test-dhcp-option.c @@ -0,0 +1,378 @@ + +#include +#include +#include +#include +#include + +#include "util.h" +#include "macro.h" + +#include "dhcp-protocol.h" +#include "dhcp-internal.h" + +struct option_desc { + uint8_t sname[64]; + int snamelen; + uint8_t file[128]; + int filelen; + uint8_t options[128]; + int len; + bool success; + int filepos; + int snamepos; + int pos; +}; + +static bool verbose = false; + +static struct option_desc option_tests[] = { + { {}, 0, {}, 0, { 42, 5, 65, 66, 67, 68, 69 }, 7, false, }, + { {}, 0, {}, 0, { 42, 5, 65, 66, 67, 68, 69, 0, 0, + DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_ACK }, 12, true, }, + { {}, 0, {}, 0, { 8, 255, 70, 71, 72 }, 5, false, }, + { {}, 0, {}, 0, { 0x35, 0x01, 0x05, 0x36, 0x04, 0x01, 0x00, 0xa8, + 0xc0, 0x33, 0x04, 0x00, 0x01, 0x51, 0x80, 0x01, + 0x04, 0xff, 0xff, 0xff, 0x00, 0x03, 0x04, 0xc0, + 0xa8, 0x00, 0x01, 0x06, 0x04, 0xc0, 0xa8, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }, + 40, true, }, + { {}, 0, {}, 0, { DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_OFFER, + 42, 3, 0, 0, 0 }, 8, true, }, + { {}, 0, {}, 0, { 42, 2, 1, 2, 44 }, 5, false, }, + + { {}, 0, + { 222, 3, 1, 2, 3, DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_NAK }, 8, + { DHCP_OPTION_OVERLOAD, 1, DHCP_OVERLOAD_FILE }, 3, true, }, + + { { 1, 4, 1, 2, 3, 4, DHCP_OPTION_MESSAGE_TYPE, 1, DHCP_ACK }, 9, + { 222, 3, 1, 2, 3 }, 5, + { DHCP_OPTION_OVERLOAD, 1, + DHCP_OVERLOAD_FILE|DHCP_OVERLOAD_SNAME }, 3, true, }, +}; + +static const char *dhcp_type(int type) +{ + switch(type) { + case DHCP_DISCOVER: + return "DHCPDISCOVER"; + case DHCP_OFFER: + return "DHCPOFFER"; + case DHCP_REQUEST: + return "DHCPREQUEST"; + case DHCP_DECLINE: + return "DHCPDECLINE"; + case DHCP_ACK: + return "DHCPACK"; + case DHCP_NAK: + return "DHCPNAK"; + case DHCP_RELEASE: + return "DHCPRELEASE"; + default: + return "unknown"; + } +} + +static void test_invalid_buffer_length(void) +{ + DHCPMessage message; + + assert_se(dhcp_option_parse(&message, 0, NULL, NULL) == -EINVAL); + assert_se(dhcp_option_parse(&message, sizeof(DHCPMessage), NULL, NULL) + == -EINVAL); +} + +static void test_cookie(void) +{ + _cleanup_free_ DHCPMessage *message; + size_t len = sizeof(DHCPMessage) + 4; + uint8_t *opt; + + message = malloc0(len); + + opt = (uint8_t *)(message + 1); + opt[0] = 0xff; + + assert_se(dhcp_option_parse(message, len, NULL, NULL) == -EINVAL); + + opt[0] = 99; + opt[1] = 130; + opt[2] = 83; + opt[3] = 99; + + assert_se(dhcp_option_parse(message, len, NULL, NULL) == -ENOMSG); +} + +static DHCPMessage *create_message(uint8_t *options, uint16_t optlen, + uint8_t *file, uint8_t filelen, + uint8_t *sname, uint8_t snamelen) +{ + DHCPMessage *message; + size_t len = sizeof(DHCPMessage) + 4 + optlen; + uint8_t *opt; + + message = malloc0(len); + opt = (uint8_t *)(message + 1); + + opt[0] = 99; + opt[1] = 130; + opt[2] = 83; + opt[3] = 99; + + if (options && optlen) + memcpy(&opt[4], options, optlen); + + if (file && filelen <= 128) + memcpy(&message->file, file, filelen); + + if (sname && snamelen <= 64) + memcpy(&message->sname, sname, snamelen); + + return message; +} + +static void test_ignore_opts(uint8_t *descoption, int *descpos, int *desclen) +{ + while (*descpos < *desclen) { + switch(descoption[*descpos]) { + case DHCP_OPTION_PAD: + *descpos += 1; + break; + + case DHCP_OPTION_MESSAGE_TYPE: + case DHCP_OPTION_OVERLOAD: + *descpos += 3; + break; + + default: + return; + } + } +} + +static int test_options_cb(uint8_t code, uint8_t len, const uint8_t *option, + void *user_data) +{ + struct option_desc *desc = user_data; + uint8_t *descoption = NULL; + int *desclen = NULL, *descpos = NULL; + uint8_t optcode = 0; + uint8_t optlen = 0; + uint8_t i; + + assert_se((!desc && !code && !len) || desc); + + if (!desc) + return -EINVAL; + + assert_se(code != DHCP_OPTION_PAD); + assert_se(code != DHCP_OPTION_END); + assert_se(code != DHCP_OPTION_MESSAGE_TYPE); + assert_se(code != DHCP_OPTION_OVERLOAD); + + while (desc->pos >= 0 || desc->filepos >= 0 || desc->snamepos >= 0) { + + if (desc->pos >= 0) { + descoption = &desc->options[0]; + desclen = &desc->len; + descpos = &desc->pos; + } else if (desc->filepos >= 0) { + descoption = &desc->file[0]; + desclen = &desc->filelen; + descpos = &desc->filepos; + } else if (desc->snamepos >= 0) { + descoption = &desc->sname[0]; + desclen = &desc->snamelen; + descpos = &desc->snamepos; + } + + assert_se(descoption && desclen && descpos); + + if (*desclen) + test_ignore_opts(descoption, descpos, desclen); + + if (*descpos < *desclen) + break; + + if (*descpos == *desclen) + *descpos = -1; + } + + assert_se(descpos); + assert_se(*descpos != -1); + + optcode = descoption[*descpos]; + optlen = descoption[*descpos + 1]; + + if (verbose) + printf("DHCP code %2d(%2d) len %2d(%2d) ", code, optcode, + len, optlen); + + assert_se(code == optcode); + assert_se(len == optlen); + + for (i = 0; i < len; i++) { + + if (verbose) + printf("0x%02x(0x%02x) ", option[i], + descoption[*descpos + 2 + i]); + + assert_se(option[i] == descoption[*descpos + 2 + i]); + } + + if (verbose) + printf("\n"); + + *descpos += optlen + 2; + + test_ignore_opts(descoption, descpos, desclen); + + if (desc->pos != -1 && desc->pos == desc->len) + desc->pos = -1; + + if (desc->filepos != -1 && desc->filepos == desc->filelen) + desc->filepos = -1; + + if (desc->snamepos != -1 && desc->snamepos == desc->snamelen) + desc->snamepos = -1; + + return 0; +} + +static void test_options(struct option_desc *desc) +{ + uint8_t *options = NULL; + uint8_t *file = NULL; + uint8_t *sname = NULL; + int optlen = 0; + int filelen = 0; + int snamelen = 0; + int buflen = 0; + _cleanup_free_ DHCPMessage *message; + int res; + + if (desc) { + file = &desc->file[0]; + filelen = desc->filelen; + if (!filelen) + desc->filepos = -1; + + sname = &desc->sname[0]; + snamelen = desc->snamelen; + if (!snamelen) + desc->snamepos = -1; + + options = &desc->options[0]; + optlen = desc->len; + desc->pos = 0; + } + message = create_message(options, optlen, file, filelen, + sname, snamelen); + + buflen = sizeof(DHCPMessage) + 4 + optlen; + + if (!desc) { + assert_se((res = dhcp_option_parse(message, buflen, + test_options_cb, + NULL)) == -ENOMSG); + } else if (desc->success) { + assert_se((res = dhcp_option_parse(message, buflen, + test_options_cb, + desc)) >= 0); + assert_se(desc->pos == -1 && desc->filepos == -1 && + desc->snamepos == -1); + } else + assert_se((res = dhcp_option_parse(message, buflen, + test_options_cb, + desc)) < 0); + + if (verbose) + printf("DHCP type %s\n", dhcp_type(res)); +} + +static uint8_t result[64] = { + 'A', 'B', 'C', 'D', +}; + +static uint8_t options[64] = { + 'A', 'B', 'C', 'D', + 160, 2, 0x11, 0x12, + 0, + 31, 8, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, + 0, + 55, 3, 0x51, 0x52, 0x53, + 17, 7, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 255 +}; + +static void test_option_set(void) +{ + size_t len, oldlen; + int pos, i; + uint8_t *opt; + + assert_se(dhcp_option_append(NULL, NULL, 0, 0, NULL) == -EINVAL); + + len = 0; + opt = &result[0]; + assert_se(dhcp_option_append(&opt, NULL, 0, 0, NULL) == -EINVAL); + assert_se(opt == &result[0] && len == 0); + + assert_se(dhcp_option_append(&opt, &len, DHCP_OPTION_PAD, + 0, NULL) == -ENOBUFS); + assert_se(opt == &result[0] && len == 0); + + opt = &result[4]; + len = 1; + assert_se(dhcp_option_append(&opt, &len, DHCP_OPTION_PAD, + 0, NULL) >= 0); + assert_se(opt == &result[5] && len == 0); + + pos = 4; + len = 60; + while (pos < 64 && options[pos] != DHCP_OPTION_END) { + opt = &result[pos]; + oldlen = len; + + assert_se(dhcp_option_append(&opt, &len, options[pos], + options[pos + 1], + &options[pos + 2]) >= 0); + + if (options[pos] == DHCP_OPTION_PAD) { + assert_se(opt == &result[pos + 1]); + assert_se(len == oldlen - 1); + pos++; + } else { + assert_se(opt == &result[pos + 2 + options[pos + 1]]); + assert_se(len == oldlen - 2 - options[pos + 1]); + pos += 2 + options[pos + 1]; + } + } + + for (i = 0; i < pos; i++) { + if (verbose) + printf("%2d: 0x%02x(0x%02x)\n", i, result[i], + options[i]); + assert_se(result[i] == options[i]); + } + + if (verbose) + printf ("\n"); +} + +int main(int argc, char *argv[]) +{ + unsigned int i; + + test_invalid_buffer_length(); + test_cookie(); + + test_options(NULL); + + for (i = 0; i < ELEMENTSOF(option_tests); i++) + test_options(&option_tests[i]); + + test_option_set(); + + return 0; +} -- cgit v1.2.3-54-g00ecf