diff options
Diffstat (limited to 'src/libsystemd')
| -rw-r--r-- | src/libsystemd/dhcp-internal.h | 44 | ||||
| -rw-r--r-- | src/libsystemd/dhcp-network.c | 106 | ||||
| -rw-r--r-- | src/libsystemd/dhcp-option.c | 184 | ||||
| -rw-r--r-- | src/libsystemd/dhcp-protocol.h | 119 | ||||
| -rw-r--r-- | src/libsystemd/sd-dhcp-client.c | 1185 | ||||
| -rw-r--r-- | src/libsystemd/test-dhcp-client.c | 233 | ||||
| -rw-r--r-- | src/libsystemd/test-dhcp-option.c | 378 |
7 files changed, 2249 insertions, 0 deletions
diff --git a/src/libsystemd/dhcp-internal.h b/src/libsystemd/dhcp-internal.h new file mode 100644 index 0000000000..43b5b1d000 --- /dev/null +++ b/src/libsystemd/dhcp-internal.h @@ -0,0 +1,44 @@ +/*-*- 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 <http://www.gnu.org/licenses/>. +***/ + +#include <stdint.h> +#include <linux/if_packet.h> + +#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 client_address); +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 server_address, + 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); diff --git a/src/libsystemd/dhcp-network.c b/src/libsystemd/dhcp-network.c new file mode 100644 index 0000000000..b2de67e8a7 --- /dev/null +++ b/src/libsystemd/dhcp-network.c @@ -0,0 +1,106 @@ +/*** + 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 <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <string.h> +#include <linux/if_packet.h> +#include <net/ethernet.h> +#include <stdio.h> +#include <unistd.h> + +#include "socket-util.h" + +#include "dhcp-internal.h" + +int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link) +{ + int s; + + 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 (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 client_address) +{ + int s; + union sockaddr_union src = { + .in.sin_family = AF_INET, + .in.sin_port = htobe16(DHCP_PORT_CLIENT), + .in.sin_addr.s_addr = client_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 server_address, + const void *packet, size_t len) +{ + union sockaddr_union dest = { + .in.sin_family = AF_INET, + .in.sin_port = htobe16(DHCP_PORT_SERVER), + .in.sin_addr.s_addr = server_address, + }; + + if (sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)) < 0) + return -errno; + + return 0; +} diff --git a/src/libsystemd/dhcp-option.c b/src/libsystemd/dhcp-option.c new file mode 100644 index 0000000000..4d45b3b3a4 --- /dev/null +++ b/src/libsystemd/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 <http://www.gnu.org/licenses/>. +***/ + +#include <stdint.h> +#include <string.h> +#include <errno.h> +#include <stdio.h> + +#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/dhcp-protocol.h b/src/libsystemd/dhcp-protocol.h new file mode 100644 index 0000000000..76621f541b --- /dev/null +++ b/src/libsystemd/dhcp-protocol.h @@ -0,0 +1,119 @@ +/*-*- 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 <http://www.gnu.org/licenses/>. +***/ + +#include <netinet/udp.h> +#include <netinet/ip.h> +#include <stdint.h> + +#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)) + +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_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/sd-dhcp-client.c b/src/libsystemd/sd-dhcp-client.c new file mode 100644 index 0000000000..edfcb54a4c --- /dev/null +++ b/src/libsystemd/sd-dhcp-client.c @@ -0,0 +1,1185 @@ +/*** + 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 <http://www.gnu.org/licenses/>. +***/ + +#include <stdlib.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <net/ethernet.h> +#include <sys/param.h> + +#include "util.h" +#include "list.h" + +#include "dhcp-protocol.h" +#include "dhcp-internal.h" +#include "sd-dhcp-client.h" + +#define DHCP_CLIENT_MIN_OPTIONS_SIZE 312 + +struct DHCPLease { + 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; +}; + +typedef struct DHCPLease DHCPLease; + +struct sd_dhcp_client { + DHCPState state; + sd_event *event; + 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; + 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; + DHCPLease *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(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_address(sd_dhcp_client *client, struct in_addr *addr) +{ + assert_return(client, -EINVAL); + assert_return(addr, -EINVAL); + + switch (client->state) { + case DHCP_STATE_INIT: + case DHCP_STATE_SELECTING: + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_REQUESTING: + return -EADDRNOTAVAIL; + + case DHCP_STATE_BOUND: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + addr->s_addr = client->lease->address; + + break; + } + + return 0; +} + +int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) +{ + assert_return(client, -EINVAL); + assert_return(addr, -EINVAL); + + switch (client->state) { + case DHCP_STATE_INIT: + case DHCP_STATE_SELECTING: + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_REQUESTING: + return -EADDRNOTAVAIL; + + case DHCP_STATE_BOUND: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + addr->s_addr = client->lease->subnet_mask; + + break; + } + + return 0; +} + +int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr ***addr) +{ + assert_return(client, -EINVAL); + assert_return(addr, -EINVAL); + + switch (client->state) { + case DHCP_STATE_INIT: + case DHCP_STATE_SELECTING: + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_REQUESTING: + return -EADDRNOTAVAIL; + + case DHCP_STATE_BOUND: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + if (client->lease->dns) + *addr = client->lease->dns; + else + return -ENOENT; + + break; + } + + return 0; +} + +int sd_dhcp_client_prefixlen(const struct in_addr *addr) +{ + int len = 0; + uint32_t mask; + + assert_return(addr, -EADDRNOTAVAIL); + + mask = be32toh(addr->s_addr); + while (mask) { + len++; + mask = mask << 1; + } + + return len; +} + +int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) +{ + assert_return(client, -EINVAL); + assert_return(addr, -EINVAL); + + switch (client->state) { + case DHCP_STATE_INIT: + case DHCP_STATE_SELECTING: + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_REQUESTING: + return -EADDRNOTAVAIL; + + case DHCP_STATE_BOUND: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + addr->s_addr = client->lease->router; + + break; + } + + return 0; +} + +static int client_notify(sd_dhcp_client *client, int event) +{ + if (client->cb) + client->cb(client, event, client->userdata); + + return 0; +} + +static void in_addrs_free(struct in_addr **addrs) { + unsigned i; + + if (!addrs) + return; + + for (i = 0; addrs[i]; i++) + free(addrs[i]); + + free(addrs); +} + +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); + + switch (client->state) { + + case DHCP_STATE_INIT: + case DHCP_STATE_SELECTING: + case DHCP_STATE_REQUESTING: + case DHCP_STATE_BOUND: + + client->start_time = 0; + client->state = DHCP_STATE_INIT; + break; + + case DHCP_STATE_INIT_REBOOT: + case DHCP_STATE_REBOOTING: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + + break; + } + + if (client->lease) { + in_addrs_free(client->lease->dns); + free(client->lease); + client->lease = NULL; + } + + return 0; +} + +static int client_packet_init(sd_dhcp_client *client, uint8_t type, + DHCPMessage *message, uint16_t secs, + uint8_t **opt, size_t *optlen) +{ + int err; + be16_t max_size; + + *opt = (uint8_t *)(message + 1); + + if (*optlen < 4) + return -ENOBUFS; + *optlen -= 4; + + message->op = BOOTREQUEST; + message->htype = 1; + message->hlen = ETHER_ADDR_LEN; + message->xid = htobe32(client->xid); + + /* 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); + + if (client->state == DHCP_STATE_RENEWING || + client->state == DHCP_STATE_REBINDING) + message->ciaddr = client->lease->address; + + memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN); + (*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; + + /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient + Identifier option is not set */ + err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER, + ETH_ALEN, &client->mac_addr); + if (err < 0) + return err; + + if (type == DHCP_DISCOVER || type == DHCP_REQUEST) { + err = dhcp_option_append(opt, optlen, + DHCP_OPTION_PARAMETER_REQUEST_LIST, + client->req_opts_size, + client->req_opts); + if (err < 0) + return err; + + /* 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_CLIENT_MIN_OPTIONS_SIZE); + err = dhcp_option_append(opt, optlen, + DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, + 2, &max_size); + if (err < 0) + return err; + } + + return 0; +} + +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 client_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 = client_checksum(&packet->ip.ttl, len - 8); + + packet->ip.ttl = IPDEFTTL; + packet->ip.check = 0; + packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE); +} + +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_CLIENT_MIN_OPTIONS_SIZE; + len = sizeof(DHCPPacket) + optlen; + + discover = malloc0(len); + + if (!discover) + return -ENOMEM; + + err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp, + 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; + + client_append_ip_headers(discover, len); + + err = dhcp_network_send_raw_socket(client->fd, &client->link, + discover, len); + + 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_CLIENT_MIN_OPTIONS_SIZE; + len = DHCP_MESSAGE_SIZE + optlen; + + request = malloc0(len); + if (!request) + return -ENOMEM; + + err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, 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, + &request->dhcp, + len - DHCP_IP_UDP_SIZE); + } else { + client_append_ip_headers(request, len); + + err = dhcp_network_send_raw_socket(client->fd, &client->link, + request, len); + } + + return err; +} + +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; + uint16_t secs; + int err = 0; + + 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); + + err = sd_event_add_monotonic(client->event, next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_resend, client, + &client->timeout_resend); + if (err < 0) + goto error; + + secs = (usec - client->start_time) / USEC_PER_SEC; + + switch (client->state) { + case DHCP_STATE_INIT: + err = client_send_discover(client, secs); + if (err >= 0) { + client->state = DHCP_STATE_SELECTING; + client->attempt = 1; + } else { + if (client->attempt >= 64) + goto error; + } + + break; + + case DHCP_STATE_SELECTING: + err = client_send_discover(client, secs); + if (err < 0 && client->attempt >= 64) + goto error; + + break; + + case DHCP_STATE_REQUESTING: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + err = client_send_request(client, secs); + if (err < 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, err); + + /* 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, usec_t usec) +{ + int r; + + r = sd_event_add_io(client->event, client->fd, EPOLLIN, + client_receive_message, client, + &client->receive_message); + if (r < 0) + goto error; + + r = sd_event_add_monotonic(client->event, usec, 0, + client_timeout_resend, client, + &client->timeout_resend); + +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; + + 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; + + return client_initialize_events(client, 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); + if (r < 0) { + client_stop(client, r); + return 0; + } + + client->fd = r; + + return client_initialize_events(client, usec); +} + +static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option, + void *user_data) +{ + DHCPLease *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 >= 4) { + unsigned i; + + in_addrs_free(lease->dns); + + lease->dns = new0(struct in_addr*, len / 4 + 1); + if (!lease->dns) + return -ENOMEM; + + for (i = 0; i < len / 4; i++) { + lease->dns[i] = new0(struct in_addr, 1); + memcpy(&lease->dns[i]->s_addr, option + 4 * i, 4); + } + + lease->dns[i + 1] = NULL; + } + + 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; +} + +static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message, + size_t len) +{ + size_t hdrlen; + + if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE)) + return -EINVAL; + + hdrlen = message->ip.ihl * 4; + if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip, + hdrlen)) + return -EINVAL; + + message->ip.check = message->udp.len; + message->ip.ttl = 0; + + if (hdrlen + be16toh(message->udp.len) > len || + client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12)) + return -EINVAL; + + if (be16toh(message->udp.source) != DHCP_PORT_SERVER || + be16toh(message->udp.dest) != DHCP_PORT_CLIENT) + return -EINVAL; + + if (message->dhcp.op != BOOTREPLY) + return -EINVAL; + + if (be32toh(message->dhcp.xid) != client->xid) + return -EINVAL; + + if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet, + ETHER_ADDR_LEN)) + return -EINVAL; + + return 0; +} + +static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer, + size_t len) +{ + int err; + DHCPLease *lease; + + err = client_verify_headers(client, offer, len); + if (err < 0) + return err; + + lease = new0(DHCPLease, 1); + if (!lease) + return -ENOMEM; + + len = len - DHCP_IP_UDP_SIZE; + if (dhcp_option_parse(&offer->dhcp, len, client_parse_offer, + lease) != DHCP_OFFER) + goto error; + + lease->address = offer->dhcp.yiaddr; + + if (lease->address == INADDR_ANY || + lease->server_address == INADDR_ANY || + lease->subnet_mask == INADDR_ANY || + lease->lifetime == 0) + goto error; + + client->lease = lease; + + return 0; + +error: + free(lease); + + return -ENOMSG; +} + +static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf, + size_t len) +{ + int r; + DHCPPacket *ack; + DHCPMessage *dhcp; + DHCPLease *lease; + + if (client->state == DHCP_STATE_RENEWING) { + dhcp = (DHCPMessage *)buf; + } else { + ack = (DHCPPacket *)buf; + + r = client_verify_headers(client, ack, len); + if (r < 0) + return r; + + dhcp = &ack->dhcp; + len -= DHCP_IP_UDP_SIZE; + } + + lease = new0(DHCPLease, 1); + if (!lease) + return -ENOMEM; + + r = dhcp_option_parse(dhcp, len, client_parse_offer, lease); + + if (r == DHCP_NAK) { + r = DHCP_EVENT_NO_LEASE; + goto error; + } + + if (r != DHCP_ACK) { + r = -ENOMSG; + goto error; + } + + lease->address = dhcp->yiaddr; + + if (lease->address == INADDR_ANY || + lease->server_address == INADDR_ANY || + lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) { + r = -ENOMSG; + goto error; + } + + 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; + } + + free(client->lease); + } + + client->lease = lease; + + return r; + +error: + free(lease); + + 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) +{ + int err; + uint64_t next_timeout; + + 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; + + err = sd_event_add_monotonic(client->event, next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_t1, client, + &client->timeout_t1); + if (err < 0) + return err; + + 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; + + err = sd_event_add_monotonic(client->event, next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_t2, client, + &client->timeout_t2); + if (err < 0) + return err; + + next_timeout = client_compute_timeout(client->request_sent, + client->lease->lifetime); + if (next_timeout < usec) + return -EINVAL; + + err = sd_event_add_monotonic(client->event, next_timeout, + 10 * USEC_PER_MSEC, + client_timeout_expire, client, + &client->timeout_expire); + if (err < 0) + return err; + + return 0; +} + +static int client_receive_message(sd_event_source *s, int fd, + uint32_t revents, void *userdata) +{ + sd_dhcp_client *client = userdata; + uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE]; + int buflen = sizeof(buf); + int len, r = 0, notify_event = 0; + DHCPPacket *message; + usec_t time_now; + + len = read(fd, &buf, buflen); + if (len < 0) + return 0; + + r = sd_event_get_now_monotonic(client->event, &time_now); + if (r < 0) + goto error; + + switch (client->state) { + case DHCP_STATE_SELECTING: + + message = (DHCPPacket *)&buf; + + if (client_receive_offer(client, message, len) >= 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, time_now, 0, + client_timeout_resend, + client, + &client->timeout_resend); + if (r < 0) + goto error; + } + + break; + + case DHCP_STATE_REQUESTING: + case DHCP_STATE_RENEWING: + case DHCP_STATE_REBINDING: + + r = client_receive_ack(client, buf, 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; +} + +int sd_dhcp_client_start(sd_dhcp_client *client) +{ + int r; + + assert_return(client, -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); + + return client_initialize_events(client, client->start_time); +} + +int sd_dhcp_client_stop(sd_dhcp_client *client) +{ + return client_stop(client, DHCP_EVENT_STOP); +} + +sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client) +{ + assert_return(client, NULL); + + sd_dhcp_client_stop(client); + + sd_event_unref(client->event); + free(client->req_opts); + free(client); + + return NULL; +} + +sd_dhcp_client *sd_dhcp_client_new(sd_event *event) +{ + sd_dhcp_client *client; + + assert_return(event, NULL); + + client = new0(sd_dhcp_client, 1); + if (!client) + return NULL; + + client->event = sd_event_ref(event); + 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) { + free(client); + return NULL; + } + + return client; +} diff --git a/src/libsystemd/test-dhcp-client.c b/src/libsystemd/test-dhcp-client.c new file mode 100644 index 0000000000..929b869ec3 --- /dev/null +++ b/src/libsystemd/test-dhcp-client.c @@ -0,0 +1,233 @@ +/*-*- 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 <http://www.gnu.org/licenses/>. +***/ + +#include <stdlib.h> +#include <assert.h> +#include <errno.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <unistd.h> + +#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'} +}; + +static int test_fd[2]; + +static void test_request_basic(sd_event *e) +{ + sd_dhcp_client *client; + + client = sd_dhcp_client_new(e); + + assert(client); + + assert(sd_dhcp_client_set_request_option(NULL, 0) == -EINVAL); + assert(sd_dhcp_client_set_request_address(NULL, NULL) == -EINVAL); + assert(sd_dhcp_client_set_index(NULL, 0) == -EINVAL); + + assert(sd_dhcp_client_set_index(client, 15) == 0); + assert(sd_dhcp_client_set_index(client, -42) == -EINVAL); + assert(sd_dhcp_client_set_index(client, -1) == 0); + + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_SUBNET_MASK) == -EEXIST); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_ROUTER) == -EEXIST); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_HOST_NAME) == -EEXIST); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_DOMAIN_NAME) == -EEXIST); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_DOMAIN_NAME_SERVER) + == -EEXIST); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_NTP_SERVER) == -EEXIST); + + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_PAD) == -EINVAL); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_END) == -EINVAL); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_MESSAGE_TYPE) == -EINVAL); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_OVERLOAD) == -EINVAL); + assert(sd_dhcp_client_set_request_option(client, + DHCP_OPTION_PARAMETER_REQUEST_LIST) + == -EINVAL); + + assert(sd_dhcp_client_set_request_option(client, 33) == 0); + assert(sd_dhcp_client_set_request_option(client, 33) == -EEXIST); + assert(sd_dhcp_client_set_request_option(client, 44) == 0); + assert(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 + }; + + assert(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; + int res; + + assert(s >= 0); + assert(packet); + + size = sizeof(DHCPPacket) + 4; + assert(len > size); + + discover = memdup(packet, len); + + assert(memcmp(discover->dhcp.chaddr, + &mac_addr.ether_addr_octet, 6) == 0); + assert(discover->ip.ttl == IPDEFTTL); + assert(discover->ip.protocol == IPPROTO_UDP); + assert(discover->ip.saddr == INADDR_ANY); + assert(discover->ip.daddr == INADDR_BROADCAST); + assert(discover->udp.source == be16toh(DHCP_PORT_CLIENT)); + assert(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(udp_check == 0xffff); + + discover->ip.ttl = IPDEFTTL; + discover->ip.check = ip_check; + + ip_check = ~client_checksum(&discover->ip, sizeof(discover->ip)); + assert(ip_check == 0xffff); + + size = len - sizeof(struct iphdr) - sizeof(struct udphdr); + + res = dhcp_option_parse(&discover->dhcp, size, check_options, NULL); + if (res < 0) + return res; + + 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 client_address) +{ + return 0; +} + +int dhcp_network_send_udp_socket(int s, be32_t server_address, + const void *packet, size_t len) +{ + return 0; +} + +static void test_discover_message(sd_event *e) +{ + sd_dhcp_client *client; + int res; + + client = sd_dhcp_client_new(e); + assert(client); + + assert(sd_dhcp_client_set_index(client, 42) >= 0); + assert(sd_dhcp_client_set_mac(client, &mac_addr) >= 0); + + assert(sd_dhcp_client_set_request_option(client, 248) >= 0); + + res = sd_dhcp_client_start(client); + + assert(res == 0 || res == -EINPROGRESS); + + close(test_fd[0]); + close(test_fd[1]); +} + +int main(int argc, char *argv[]) +{ + sd_event *e; + + assert(sd_event_new(&e) >= 0); + + test_request_basic(e); + test_checksum(); + + test_discover_message(e); + sd_event_run(e, (uint64_t) -1); + + return 0; +} diff --git a/src/libsystemd/test-dhcp-option.c b/src/libsystemd/test-dhcp-option.c new file mode 100644 index 0000000000..ac0b0a435a --- /dev/null +++ b/src/libsystemd/test-dhcp-option.c @@ -0,0 +1,378 @@ + +#include <stdio.h> +#include <stdbool.h> +#include <errno.h> +#include <string.h> +#include <assert.h> + +#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(dhcp_option_parse(&message, 0, NULL, NULL) == -EINVAL); + assert(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(dhcp_option_parse(message, len, NULL, NULL) == -EINVAL); + + opt[0] = 99; + opt[1] = 130; + opt[2] = 83; + opt[3] = 99; + + assert(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((!desc && !code && !len) || desc); + + if (!desc) + return -EINVAL; + + assert(code != DHCP_OPTION_PAD); + assert(code != DHCP_OPTION_END); + assert(code != DHCP_OPTION_MESSAGE_TYPE); + assert(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(descoption && desclen && descpos); + + if (*desclen) + test_ignore_opts(descoption, descpos, desclen); + + if (*descpos < *desclen) + break; + + if (*descpos == *desclen) + *descpos = -1; + } + + assert(descpos); + assert(*descpos != -1); + + optcode = descoption[*descpos]; + optlen = descoption[*descpos + 1]; + + if (verbose) + printf("DHCP code %2d(%2d) len %2d(%2d) ", code, optcode, + len, optlen); + + assert(code == optcode); + assert(len == optlen); + + for (i = 0; i < len; i++) { + + if (verbose) + printf("0x%02x(0x%02x) ", option[i], + descoption[*descpos + 2 + i]); + + assert(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((res = dhcp_option_parse(message, buflen, + test_options_cb, + NULL)) == -ENOMSG); + } else if (desc->success) { + assert((res = dhcp_option_parse(message, buflen, + test_options_cb, + desc)) >= 0); + assert(desc->pos == -1 && desc->filepos == -1 && + desc->snamepos == -1); + } else + assert((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(dhcp_option_append(NULL, NULL, 0, 0, NULL) == -EINVAL); + + len = 0; + opt = &result[0]; + assert(dhcp_option_append(&opt, NULL, 0, 0, NULL) == -EINVAL); + assert(opt == &result[0] && len == 0); + + assert(dhcp_option_append(&opt, &len, DHCP_OPTION_PAD, + 0, NULL) == -ENOBUFS); + assert(opt == &result[0] && len == 0); + + opt = &result[4]; + len = 1; + assert(dhcp_option_append(&opt, &len, DHCP_OPTION_PAD, + 0, NULL) >= 0); + assert(opt == &result[5] && len == 0); + + pos = 4; + len = 60; + while (pos < 64 && options[pos] != DHCP_OPTION_END) { + opt = &result[pos]; + oldlen = len; + + assert(dhcp_option_append(&opt, &len, options[pos], + options[pos + 1], + &options[pos + 2]) >= 0); + + if (options[pos] == DHCP_OPTION_PAD) { + assert(opt == &result[pos + 1]); + assert(len == oldlen - 1); + pos++; + } else { + assert(opt == &result[pos + 2 + options[pos + 1]]); + assert(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(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; +} |