diff options
Diffstat (limited to 'src/libsystemd/sd-resolve')
| l--------- | src/libsystemd/sd-resolve/Makefile | 1 | ||||
| -rw-r--r-- | src/libsystemd/sd-resolve/resolve-util.h | 29 | ||||
| -rw-r--r-- | src/libsystemd/sd-resolve/sd-resolve.c | 1130 | ||||
| -rw-r--r-- | src/libsystemd/sd-resolve/test-resolve.c | 160 |
4 files changed, 1320 insertions, 0 deletions
diff --git a/src/libsystemd/sd-resolve/Makefile b/src/libsystemd/sd-resolve/Makefile new file mode 120000 index 0000000000..94aaae2c4d --- /dev/null +++ b/src/libsystemd/sd-resolve/Makefile @@ -0,0 +1 @@ +../../Makefile
\ No newline at end of file diff --git a/src/libsystemd/sd-resolve/resolve-util.h b/src/libsystemd/sd-resolve/resolve-util.h new file mode 100644 index 0000000000..58df7385c0 --- /dev/null +++ b/src/libsystemd/sd-resolve/resolve-util.h @@ -0,0 +1,29 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2014 Daniel Buch + + 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 "util.h" + +DEFINE_TRIVIAL_CLEANUP_FUNC(sd_resolve*, sd_resolve_free); +DEFINE_TRIVIAL_CLEANUP_FUNC(struct addrinfo*, sd_resolve_freeaddrinfo); +#define _cleanup_resolve_free_ _cleanup_(sd_resolve_freep) +#define _cleanup_resolve_addrinfo_free_ _cleanup_(sd_resolve_freeaddrinfop) diff --git a/src/libsystemd/sd-resolve/sd-resolve.c b/src/libsystemd/sd-resolve/sd-resolve.c new file mode 100644 index 0000000000..464967b362 --- /dev/null +++ b/src/libsystemd/sd-resolve/sd-resolve.c @@ -0,0 +1,1130 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2005-2008 Lennart Poettering + + 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 <assert.h> +#include <fcntl.h> +#include <signal.h> +#include <unistd.h> +#include <sys/select.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <sys/wait.h> +#include <sys/types.h> +#include <pwd.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <resolv.h> +#include <dirent.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <stdint.h> +#include <pthread.h> +#include <sys/prctl.h> + +#include "sd-resolve.h" +#include "util.h" + +#define MAX_WORKERS 16 +#define MAX_QUERIES 256 +#define BUFSIZE (10240) + +typedef enum { + REQUEST_ADDRINFO, + RESPONSE_ADDRINFO, + REQUEST_NAMEINFO, + RESPONSE_NAMEINFO, + REQUEST_RES_QUERY, + REQUEST_RES_SEARCH, + RESPONSE_RES, + REQUEST_TERMINATE, + RESPONSE_DIED +} QueryType; + +enum { + REQUEST_RECV_FD = 0, + REQUEST_SEND_FD = 1, + RESPONSE_RECV_FD = 2, + RESPONSE_SEND_FD = 3, + MESSAGE_FD_MAX = 4 +}; + +struct sd_resolve { + int fds[MESSAGE_FD_MAX]; + + pthread_t workers[MAX_WORKERS]; + unsigned valid_workers; + + unsigned current_id, current_index; + sd_resolve_query* queries[MAX_QUERIES]; + + sd_resolve_query *done_head, *done_tail; + + int n_queries; + int dead; +}; + +struct sd_resolve_query { + sd_resolve *resolve; + int done; + unsigned id; + QueryType type; + sd_resolve_query *done_next, *done_prev; + int ret; + int _errno; + int _h_errno; + struct addrinfo *addrinfo; + char *serv, *host; + void *userdata; +}; + +typedef struct RHeader { + QueryType type; + unsigned id; + size_t length; +} RHeader; + +typedef struct AddrInfoRequest { + struct RHeader header; + int hints_is_null; + int ai_flags; + int ai_family; + int ai_socktype; + int ai_protocol; + size_t node_len, service_len; +} AddrInfoRequest; + +typedef struct AddrInfoResponse { + struct RHeader header; + int ret; + int _errno; + int _h_errno; + /* followed by addrinfo_serialization[] */ +} AddrInfoResponse; + +typedef struct AddrInfoSerialization { + int ai_flags; + int ai_family; + int ai_socktype; + int ai_protocol; + size_t ai_addrlen; + size_t canonname_len; + /* Followed by ai_addr amd ai_canonname with variable lengths */ +} AddrInfoSerialization; + +typedef struct NameInfoRequest { + struct RHeader header; + int flags; + socklen_t sockaddr_len; + int gethost, getserv; +} NameInfoRequest; + +typedef struct NameInfoResponse { + struct RHeader header; + size_t hostlen, servlen; + int ret; + int _errno; + int _h_errno; +} NameInfoResponse; + +typedef struct ResRequest { + struct RHeader header; + int class; + int type; + size_t dname_len; +} ResRequest; + +typedef struct ResResponse { + struct RHeader header; + int ret; + int _errno; + int _h_errno; +} ResResponse; + +typedef union Packet { + RHeader rheader; + AddrInfoRequest addrinfo_request; + AddrInfoResponse addrinfo_response; + NameInfoRequest nameinfo_request; + NameInfoResponse nameinfo_response; + ResRequest res_request; + ResResponse res_response; +} Packet; + +static int send_died(int out_fd) { + RHeader rh = {}; + assert(out_fd > 0); + + rh.type = RESPONSE_DIED; + rh.id = 0; + rh.length = sizeof(rh); + + return send(out_fd, &rh, rh.length, MSG_NOSIGNAL); +} + +static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) { + AddrInfoSerialization s; + size_t cnl, l; + assert(p); + assert(ai); + assert(length); + assert(*length <= maxlength); + + cnl = (ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0); + l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl; + + if (*length + l > maxlength) + return NULL; + + s.ai_flags = ai->ai_flags; + s.ai_family = ai->ai_family; + s.ai_socktype = ai->ai_socktype; + s.ai_protocol = ai->ai_protocol; + s.ai_addrlen = ai->ai_addrlen; + s.canonname_len = cnl; + + memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization)); + memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen); + + if (ai->ai_canonname) + strcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, ai->ai_canonname); + + *length += l; + return (uint8_t*) p + l; +} + +static int send_addrinfo_reply(int out_fd, unsigned id, int ret, struct addrinfo *ai, int _errno, int _h_errno) { + AddrInfoResponse data[BUFSIZE/sizeof(AddrInfoResponse) + 1] = {}; + AddrInfoResponse *resp = data; + assert(out_fd >= 0); + + resp->header.type = RESPONSE_ADDRINFO; + resp->header.id = id; + resp->header.length = sizeof(AddrInfoResponse); + resp->ret = ret; + resp->_errno = _errno; + resp->_h_errno = _h_errno; + + if (ret == 0 && ai) { + void *p = data + 1; + struct addrinfo *k; + + for (k = ai; k; k = k->ai_next) { + p = serialize_addrinfo(p, k, &resp->header.length, (char*) data + BUFSIZE - (char*) p); + if (!p) { + resp->ret = EAI_MEMORY; + break; + } + } + } + + if (ai) + freeaddrinfo(ai); + + return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL); +} + +static int send_nameinfo_reply(int out_fd, unsigned id, int ret, const char *host, const char *serv, int _errno, int _h_errno) { + NameInfoResponse data[BUFSIZE/sizeof(NameInfoResponse) + 1] = {}; + size_t hl, sl; + NameInfoResponse *resp = data; + + assert(out_fd >= 0); + + sl = serv ? strlen(serv)+1 : 0; + hl = host ? strlen(host)+1 : 0; + + resp->header.type = RESPONSE_NAMEINFO; + resp->header.id = id; + resp->header.length = sizeof(NameInfoResponse) + hl + sl; + resp->ret = ret; + resp->_errno = _errno; + resp->_h_errno = _h_errno; + resp->hostlen = hl; + resp->servlen = sl; + + assert(sizeof(data) >= resp->header.length); + + if (host) + memcpy((uint8_t *)data + sizeof(NameInfoResponse), host, hl); + + if (serv) + memcpy((uint8_t *)data + sizeof(NameInfoResponse) + hl, serv, sl); + + return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL); +} + +static int send_res_reply(int out_fd, unsigned id, const unsigned char *answer, int ret, int _errno, int _h_errno) { + ResResponse data[BUFSIZE/sizeof(ResResponse) + 1] = {}; + ResResponse *resp = data; + + assert(out_fd >= 0); + + resp->header.type = RESPONSE_RES; + resp->header.id = id; + resp->header.length = sizeof(ResResponse) + (ret < 0 ? 0 : ret); + resp->ret = ret; + resp->_errno = _errno; + resp->_h_errno = _h_errno; + + assert(sizeof(data) >= resp->header.length); + + if (ret > 0) + memcpy((uint8_t *)data + sizeof(ResResponse), answer, ret); + + return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL); +} + +static int handle_request(int out_fd, const Packet *packet, size_t length) { + const RHeader *req; + assert(out_fd >= 0); + + req = &packet->rheader; + assert(req); + assert(length >= sizeof(RHeader)); + assert(length == req->length); + + switch (req->type) { + case REQUEST_ADDRINFO: { + struct addrinfo ai = {}, *result = NULL; + const AddrInfoRequest *ai_req = &packet->addrinfo_request; + const char *node, *service; + int ret; + + assert(length >= sizeof(AddrInfoRequest)); + assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len); + + ai.ai_flags = ai_req->ai_flags; + ai.ai_family = ai_req->ai_family; + ai.ai_socktype = ai_req->ai_socktype; + ai.ai_protocol = ai_req->ai_protocol; + + node = ai_req->node_len ? (const char*) ai_req + sizeof(AddrInfoRequest) : NULL; + service = ai_req->service_len ? (const char*) ai_req + sizeof(AddrInfoRequest) + ai_req->node_len : NULL; + + ret = getaddrinfo(node, service, + ai_req->hints_is_null ? NULL : &ai, + &result); + + /* send_addrinfo_reply() frees result */ + return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno); + } + + case REQUEST_NAMEINFO: { + int ret; + const NameInfoRequest *ni_req = &packet->nameinfo_request; + char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; + struct sockaddr_storage sa; + + assert(length >= sizeof(NameInfoRequest)); + assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len); + + memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len); + + ret = getnameinfo((struct sockaddr *)&sa, ni_req->sockaddr_len, + ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0, + ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0, + ni_req->flags); + + return send_nameinfo_reply(out_fd, req->id, ret, + ret == 0 && ni_req->gethost ? hostbuf : NULL, + ret == 0 && ni_req->getserv ? servbuf : NULL, + errno, h_errno); + } + + case REQUEST_RES_QUERY: + case REQUEST_RES_SEARCH: { + int ret; + HEADER answer[BUFSIZE/sizeof(HEADER) + 1]; + const ResRequest *res_req = &packet->res_request; + const char *dname; + + assert(length >= sizeof(ResRequest)); + assert(length == sizeof(ResRequest) + res_req->dname_len); + + dname = (const char *) req + sizeof(ResRequest); + + if (req->type == REQUEST_RES_QUERY) + ret = res_query(dname, res_req->class, res_req->type, (unsigned char *) answer, BUFSIZE); + else + ret = res_search(dname, res_req->class, res_req->type, (unsigned char *) answer, BUFSIZE); + + return send_res_reply(out_fd, req->id, (unsigned char *) answer, ret, errno, h_errno); + } + + case REQUEST_TERMINATE: + /* Quit */ + return -1; + + default: + ; + } + + return 0; +} + +static void* thread_worker(void *p) { + sd_resolve *resolve = p; + sigset_t fullset; + + /* No signals in this thread please */ + sigfillset(&fullset); + pthread_sigmask(SIG_BLOCK, &fullset, NULL); + + while (!resolve->dead) { + Packet buf[BUFSIZE/sizeof(Packet) + 1]; + ssize_t length; + + length = recv(resolve->fds[REQUEST_RECV_FD], buf, sizeof(buf), 0); + + if (length <= 0) { + if (length < 0 && (errno == EAGAIN || errno == EINTR)) + continue; + break; + } + + if (resolve->dead) + break; + + if (handle_request(resolve->fds[RESPONSE_SEND_FD], buf, (size_t) length) < 0) + break; + } + + send_died(resolve->fds[RESPONSE_SEND_FD]); + + return NULL; +} + +_public_ sd_resolve* sd_resolve_new(unsigned n_proc) { + sd_resolve *resolve = NULL; + int i, r; + + assert(n_proc >= 1); + + if (n_proc > MAX_WORKERS) + n_proc = MAX_WORKERS; + + resolve = new(sd_resolve, 1); + if (!resolve) { + errno = ENOMEM; + goto fail; + } + + resolve->dead = 0; + resolve->valid_workers = 0; + + for (i = 0; i < MESSAGE_FD_MAX; i++) + resolve->fds[i] = -1; + + memset(resolve->queries, 0, sizeof(resolve->queries)); + + r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds); + if (r < 0) + goto fail; + + r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds+2); + if (r < 0) + goto fail; + + for (resolve->valid_workers = 0; resolve->valid_workers < n_proc; resolve->valid_workers++) { + r = pthread_create(&resolve->workers[resolve->valid_workers], NULL, thread_worker, resolve); + if (r) { + errno = r; + goto fail; + } + } + + resolve->current_index = resolve->current_id = 0; + resolve->done_head = resolve->done_tail = NULL; + resolve->n_queries = 0; + + fd_nonblock(resolve->fds[RESPONSE_RECV_FD], true); + + return resolve; + +fail: + if (resolve) + sd_resolve_free(resolve); + + return NULL; +} + +_public_ void sd_resolve_free(sd_resolve *resolve) { + int i; + int saved_errno = errno; + unsigned p; + + assert(resolve); + + resolve->dead = 1; + + if (resolve->fds[REQUEST_SEND_FD] >= 0) { + RHeader req = {}; + + req.type = REQUEST_TERMINATE; + req.length = sizeof(req); + req.id = 0; + + /* Send one termination packet for each worker */ + for (p = 0; p < resolve->valid_workers; p++) + send(resolve->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); + } + + /* Now terminate them and wait until they are gone. */ + for (p = 0; p < resolve->valid_workers; p++) { + for (;;) { + if (pthread_join(resolve->workers[p], NULL) != EINTR) + break; + } + } + + /* Close all communication channels */ + for (i = 0; i < MESSAGE_FD_MAX; i++) + if (resolve->fds[i] >= 0) + close(resolve->fds[i]); + + for (p = 0; p < MAX_QUERIES; p++) + if (resolve->queries[p]) + sd_resolve_cancel(resolve, resolve->queries[p]); + + free(resolve); + + errno = saved_errno; +} + +_public_ int sd_resolve_fd(sd_resolve *resolve) { + assert(resolve); + + return resolve->fds[RESPONSE_RECV_FD]; +} + +static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { + sd_resolve_query *q; + assert(resolve); + + q = resolve->queries[id % MAX_QUERIES]; + if (q) + if (q->id == id) + return q; + + return NULL; +} + +static void complete_query(sd_resolve *resolve, sd_resolve_query *q) { + assert(resolve); + assert(q); + assert(!q->done); + + q->done = 1; + + if ((q->done_prev = resolve->done_tail)) + resolve->done_tail->done_next = q; + else + resolve->done_head = q; + + resolve->done_tail = q; + q->done_next = NULL; +} + +static const void *unserialize_addrinfo(const void *p, struct addrinfo **ret_ai, size_t *length) { + AddrInfoSerialization s; + size_t l; + struct addrinfo *ai; + assert(p); + assert(ret_ai); + assert(length); + + if (*length < sizeof(AddrInfoSerialization)) + return NULL; + + memcpy(&s, p, sizeof(s)); + + l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; + if (*length < l) + return NULL; + + ai = new(struct addrinfo, 1); + if (!ai) + goto fail; + + ai->ai_addr = NULL; + ai->ai_canonname = NULL; + ai->ai_next = NULL; + + if (s.ai_addrlen && !(ai->ai_addr = malloc(s.ai_addrlen))) + goto fail; + + if (s.canonname_len && !(ai->ai_canonname = malloc(s.canonname_len))) + goto fail; + + ai->ai_flags = s.ai_flags; + ai->ai_family = s.ai_family; + ai->ai_socktype = s.ai_socktype; + ai->ai_protocol = s.ai_protocol; + ai->ai_addrlen = s.ai_addrlen; + + if (ai->ai_addr) + memcpy(ai->ai_addr, (const uint8_t*) p + sizeof(AddrInfoSerialization), s.ai_addrlen); + + if (ai->ai_canonname) + memcpy(ai->ai_canonname, (const uint8_t*) p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); + + *length -= l; + *ret_ai = ai; + + return (const uint8_t*) p + l; + + +fail: + if (ai) + sd_resolve_freeaddrinfo(ai); + + return NULL; +} + +static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { + const RHeader *resp; + sd_resolve_query *q; + + assert(resolve); + + resp = &packet->rheader; + assert(resp); + assert(length >= sizeof(RHeader)); + assert(length == resp->length); + + if (resp->type == RESPONSE_DIED) { + resolve->dead = 1; + return 0; + } + + q = lookup_query(resolve, resp->id); + if (!q) + return 0; + + switch (resp->type) { + case RESPONSE_ADDRINFO: { + const AddrInfoResponse *ai_resp = &packet->addrinfo_response; + const void *p; + size_t l; + struct addrinfo *prev = NULL; + + assert(length >= sizeof(AddrInfoResponse)); + assert(q->type == REQUEST_ADDRINFO); + + q->ret = ai_resp->ret; + q->_errno = ai_resp->_errno; + q->_h_errno = ai_resp->_h_errno; + l = length - sizeof(AddrInfoResponse); + p = (const uint8_t*) resp + sizeof(AddrInfoResponse); + + while (l > 0 && p) { + struct addrinfo *ai = NULL; + p = unserialize_addrinfo(p, &ai, &l); + + if (!p || !ai) { + q->ret = EAI_MEMORY; + break; + } + + if (prev) + prev->ai_next = ai; + else + q->addrinfo = ai; + + prev = ai; + } + + complete_query(resolve, q); + break; + } + + case RESPONSE_NAMEINFO: { + const NameInfoResponse *ni_resp = &packet->nameinfo_response; + + assert(length >= sizeof(NameInfoResponse)); + assert(q->type == REQUEST_NAMEINFO); + + q->ret = ni_resp->ret; + q->_errno = ni_resp->_errno; + q->_h_errno = ni_resp->_h_errno; + + if (ni_resp->hostlen) + if (!(q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1))) + q->ret = EAI_MEMORY; + + if (ni_resp->servlen) + if (!(q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1))) + q->ret = EAI_MEMORY; + + complete_query(resolve, q); + break; + } + + case RESPONSE_RES: { + const ResResponse *res_resp = &packet->res_response; + + assert(length >= sizeof(ResResponse)); + assert(q->type == REQUEST_RES_QUERY || q->type == REQUEST_RES_SEARCH); + + q->ret = res_resp->ret; + q->_errno = res_resp->_errno; + q->_h_errno = res_resp->_h_errno; + + if (res_resp->ret >= 0) { + if (!(q->serv = malloc(res_resp->ret))) { + q->ret = -1; + q->_errno = ENOMEM; + } else + memcpy(q->serv, (const char *)resp + sizeof(ResResponse), res_resp->ret); + } + + complete_query(resolve, q); + break; + } + + default: + ; + } + + return 0; +} + +_public_ int sd_resolve_wait(sd_resolve *resolve, int block) { + int handled = 0; + assert(resolve); + + for (;;) { + Packet buf[BUFSIZE/sizeof(Packet) + 1]; + ssize_t l; + + if (resolve->dead) { + errno = ECHILD; + return -1; + } + + l = recv(resolve->fds[RESPONSE_RECV_FD], buf, sizeof(buf), 0); + if (l < 0) { + fd_set fds; + + if (errno != EAGAIN) + return -1; + + if (!block || handled) + return 0; + + FD_ZERO(&fds); + FD_SET(resolve->fds[RESPONSE_RECV_FD], &fds); + + if (select(resolve->fds[RESPONSE_RECV_FD]+1, &fds, NULL, NULL, NULL) < 0) + return -1; + + continue; + } + + if (handle_response(resolve, buf, (size_t) l) < 0) + return -1; + + handled = 1; + } +} + +static sd_resolve_query *alloc_query(sd_resolve *resolve) { + sd_resolve_query *q; + assert(resolve); + + if (resolve->n_queries >= MAX_QUERIES) { + errno = ENOMEM; + return NULL; + } + + while (resolve->queries[resolve->current_index]) { + resolve->current_index++; + resolve->current_id++; + + while (resolve->current_index >= MAX_QUERIES) + resolve->current_index -= MAX_QUERIES; + } + + q = resolve->queries[resolve->current_index] = new(sd_resolve_query, 1); + if (!q) { + errno = ENOMEM; + return NULL; + } + + resolve->n_queries++; + + q->resolve = resolve; + q->done = 0; + q->id = resolve->current_id; + q->done_next = q->done_prev = NULL; + q->ret = 0; + q->_errno = 0; + q->_h_errno = 0; + q->addrinfo = NULL; + q->userdata = NULL; + q->host = q->serv = NULL; + + return q; +} + +_public_ sd_resolve_query* sd_resolve_getaddrinfo(sd_resolve *resolve, const char *node, const char *service, const struct addrinfo *hints) { + AddrInfoRequest data[BUFSIZE/sizeof(AddrInfoRequest) + 1] = {}; + AddrInfoRequest *req = data; + sd_resolve_query *q; + assert(resolve); + assert(node || service); + + if (resolve->dead) { + errno = ECHILD; + return NULL; + } + + q = alloc_query(resolve); + if (!q) + return NULL; + + req->node_len = node ? strlen(node)+1 : 0; + req->service_len = service ? strlen(service)+1 : 0; + + req->header.id = q->id; + req->header.type = q->type = REQUEST_ADDRINFO; + req->header.length = sizeof(AddrInfoRequest) + req->node_len + req->service_len; + + if (req->header.length > BUFSIZE) { + errno = ENOMEM; + goto fail; + } + + if (!(req->hints_is_null = !hints)) { + req->ai_flags = hints->ai_flags; + req->ai_family = hints->ai_family; + req->ai_socktype = hints->ai_socktype; + req->ai_protocol = hints->ai_protocol; + } + + if (node) + strcpy((char*) req + sizeof(AddrInfoRequest), node); + + if (service) + strcpy((char*) req + sizeof(AddrInfoRequest) + req->node_len, service); + + if (send(resolve->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0) + goto fail; + + return q; + +fail: + if (q) + sd_resolve_cancel(resolve, q); + + return NULL; +} + +_public_ int sd_resolve_getaddrinfo_done(sd_resolve *resolve, sd_resolve_query* q, struct addrinfo **ret_res) { + int ret; + assert(resolve); + assert(q); + assert(q->resolve == resolve); + assert(q->type == REQUEST_ADDRINFO); + + if (resolve->dead) { + errno = ECHILD; + return EAI_SYSTEM; + } + + if (!q->done) + return EAI_AGAIN; + + *ret_res = q->addrinfo; + q->addrinfo = NULL; + + ret = q->ret; + + if (ret == EAI_SYSTEM) + errno = q->_errno; + + if (ret != 0) + h_errno = q->_h_errno; + + sd_resolve_cancel(resolve, q); + + return ret; +} + +_public_ sd_resolve_query* sd_resolve_getnameinfo(sd_resolve *resolve, const struct sockaddr *sa, socklen_t salen, int flags, int gethost, int getserv) { + NameInfoRequest data[BUFSIZE/sizeof(NameInfoRequest) + 1] = {}; + NameInfoRequest *req = data; + sd_resolve_query *q; + + assert(resolve); + assert(sa); + assert(salen > 0); + + if (resolve->dead) { + errno = ECHILD; + return NULL; + } + + q = alloc_query(resolve); + if (!q) + return NULL; + + req->header.id = q->id; + req->header.type = q->type = REQUEST_NAMEINFO; + req->header.length = sizeof(NameInfoRequest) + salen; + + if (req->header.length > BUFSIZE) { + errno = ENOMEM; + goto fail; + } + + req->flags = flags; + req->sockaddr_len = salen; + req->gethost = gethost; + req->getserv = getserv; + + memcpy((uint8_t*) req + sizeof(NameInfoRequest), sa, salen); + + if (send(resolve->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0) + goto fail; + + return q; + +fail: + if (q) + sd_resolve_cancel(resolve, q); + + return NULL; +} + +_public_ int sd_resolve_getnameinfo_done(sd_resolve *resolve, sd_resolve_query* q, char *ret_host, size_t hostlen, char *ret_serv, size_t servlen) { + int ret; + assert(resolve); + assert(q); + assert(q->resolve == resolve); + assert(q->type == REQUEST_NAMEINFO); + assert(!ret_host || hostlen); + assert(!ret_serv || servlen); + + if (resolve->dead) { + errno = ECHILD; + return EAI_SYSTEM; + } + + if (!q->done) + return EAI_AGAIN; + + if (ret_host && q->host) { + strncpy(ret_host, q->host, hostlen); + ret_host[hostlen-1] = 0; + } + + if (ret_serv && q->serv) { + strncpy(ret_serv, q->serv, servlen); + ret_serv[servlen-1] = 0; + } + + ret = q->ret; + + if (ret == EAI_SYSTEM) + errno = q->_errno; + + if (ret != 0) + h_errno = q->_h_errno; + + sd_resolve_cancel(resolve, q); + + return ret; +} + +static sd_resolve_query * resolve_res(sd_resolve *resolve, QueryType qtype, const char *dname, int class, int type) { + ResRequest data[BUFSIZE/sizeof(ResRequest) + 1]; + ResRequest *req = data; + sd_resolve_query *q; + + assert(resolve); + assert(dname); + + if (resolve->dead) { + errno = ECHILD; + return NULL; + } + + q = alloc_query(resolve); + if (!q) + return NULL; + + req->dname_len = strlen(dname) + 1; + + req->header.id = q->id; + req->header.type = q->type = qtype; + req->header.length = sizeof(ResRequest) + req->dname_len; + + if (req->header.length > BUFSIZE) { + errno = ENOMEM; + goto fail; + } + + req->class = class; + req->type = type; + + strcpy((char*) req + sizeof(ResRequest), dname); + + if (send(resolve->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0) + goto fail; + + return q; + +fail: + if (q) + sd_resolve_cancel(resolve, q); + + return NULL; +} + +_public_ sd_resolve_query* sd_resolve_res_query(sd_resolve *resolve, const char *dname, int class, int type) { + return resolve_res(resolve, REQUEST_RES_QUERY, dname, class, type); +} + +_public_ sd_resolve_query* sd_resolve_res_search(sd_resolve *resolve, const char *dname, int class, int type) { + return resolve_res(resolve, REQUEST_RES_SEARCH, dname, class, type); +} + +_public_ int sd_resolve_res_done(sd_resolve *resolve, sd_resolve_query* q, unsigned char **answer) { + int ret; + assert(resolve); + assert(q); + assert(q->resolve == resolve); + assert(q->type == REQUEST_RES_QUERY || q->type == REQUEST_RES_SEARCH); + assert(answer); + + if (resolve->dead) { + errno = ECHILD; + return -ECHILD; + } + + if (!q->done) { + errno = EAGAIN; + return -EAGAIN; + } + + *answer = (unsigned char *)q->serv; + q->serv = NULL; + + ret = q->ret; + + if (ret < 0) { + errno = q->_errno; + h_errno = q->_h_errno; + } + + sd_resolve_cancel(resolve, q); + + return ret < 0 ? -errno : ret; +} + +_public_ sd_resolve_query* sd_resolve_get_next(sd_resolve *resolve) { + assert(resolve); + return resolve->done_head; +} + +_public_ int sd_resolve_get_n_queries(sd_resolve *resolve) { + assert(resolve); + return resolve->n_queries; +} + +_public_ void sd_resolve_cancel(sd_resolve *resolve, sd_resolve_query* q) { + int i; + int saved_errno = errno; + + assert(resolve); + assert(q); + assert(q->resolve == resolve); + assert(resolve->n_queries > 0); + + if (q->done) { + + if (q->done_prev) + q->done_prev->done_next = q->done_next; + else + resolve->done_head = q->done_next; + + if (q->done_next) + q->done_next->done_prev = q->done_prev; + else + resolve->done_tail = q->done_prev; + } + + i = q->id % MAX_QUERIES; + assert(resolve->queries[i] == q); + resolve->queries[i] = NULL; + + sd_resolve_freeaddrinfo(q->addrinfo); + free(q->host); + free(q->serv); + + resolve->n_queries--; + free(q); + + errno = saved_errno; +} + +_public_ void sd_resolve_freeaddrinfo(struct addrinfo *ai) { + int saved_errno = errno; + + while (ai) { + struct addrinfo *next = ai->ai_next; + + free(ai->ai_addr); + free(ai->ai_canonname); + free(ai); + + ai = next; + } + + errno = saved_errno; +} + +_public_ int sd_resolve_isdone(sd_resolve *resolve, sd_resolve_query*q) { + assert(resolve); + assert(q); + assert(q->resolve == resolve); + + return q->done; +} + +_public_ void sd_resolve_setuserdata(sd_resolve *resolve, sd_resolve_query *q, void *userdata) { + assert(q); + assert(resolve); + assert(q->resolve = resolve); + + q->userdata = userdata; +} + +_public_ void* sd_resolve_getuserdata(sd_resolve *resolve, sd_resolve_query *q) { + assert(q); + assert(resolve); + assert(q->resolve = resolve); + + return q->userdata; +} diff --git a/src/libsystemd/sd-resolve/test-resolve.c b/src/libsystemd/sd-resolve/test-resolve.c new file mode 100644 index 0000000000..3903e64d70 --- /dev/null +++ b/src/libsystemd/sd-resolve/test-resolve.c @@ -0,0 +1,160 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2005-2008 Lennart Poettering + + 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 <string.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include <stdio.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <resolv.h> +#include <assert.h> +#include <signal.h> +#include <errno.h> + +#include "sd-resolve.h" +#include "resolve-util.h" +#include "macro.h" + +int main(int argc, char *argv[]) { + int r = 1, ret; + _cleanup_resolve_free_ sd_resolve *resolve = NULL; + _cleanup_resolve_addrinfo_free_ struct addrinfo *ai = NULL; + _cleanup_free_ unsigned char *srv = NULL; + sd_resolve_query *q1, *q2, *q3; + struct addrinfo hints = {}; + struct sockaddr_in sa = {}; + char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = ""; + + signal(SIGCHLD, SIG_IGN); + + resolve = sd_resolve_new(2); + if (!resolve) + log_oom(); + + /* Make a name -> address query */ + hints.ai_family = PF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + + q1 = sd_resolve_getaddrinfo(resolve, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints); + if (!q1) + fprintf(stderr, "sd_resolve_getaddrinfo(): %s\n", strerror(errno)); + + /* Make an address -> name query */ + sa.sin_family = AF_INET; + sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71"); + sa.sin_port = htons(80); + + q2 = sd_resolve_getnameinfo(resolve, (struct sockaddr*) &sa, sizeof(sa), 0, 1, 1); + if (!q2) + fprintf(stderr, "sd_resolve_getnameinfo(): %s\n", strerror(errno)); + + /* Make a res_query() call */ + q3 = sd_resolve_res_query(resolve, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV); + if (!q3) + fprintf(stderr, "sd_resolve_res_query(): %s\n", strerror(errno)); + + /* Wait until the three queries are completed */ + while (!sd_resolve_isdone(resolve, q1) || + !sd_resolve_isdone(resolve, q2) || + !sd_resolve_isdone(resolve, q3)) { + if (sd_resolve_wait(resolve, 1) < 0) + fprintf(stderr, "sd_resolve_wait(): %s\n", strerror(errno)); + } + + /* Interpret the result of the name -> addr query */ + ret = sd_resolve_getaddrinfo_done(resolve, q1, &ai); + if (ret) + fprintf(stderr, "error: %s %i\n", gai_strerror(ret), ret); + else { + struct addrinfo *i; + + for (i = ai; i; i = i->ai_next) { + char t[256]; + const char *p = NULL; + + if (i->ai_family == PF_INET) + p = inet_ntop(AF_INET, &((struct sockaddr_in*) i->ai_addr)->sin_addr, t, sizeof(t)); + else if (i->ai_family == PF_INET6) + p = inet_ntop(AF_INET6, &((struct sockaddr_in6*) i->ai_addr)->sin6_addr, t, sizeof(t)); + + printf("%s\n", p); + } + } + + /* Interpret the result of the addr -> name query */ + ret = sd_resolve_getnameinfo_done(resolve, q2, host, sizeof(host), serv, sizeof(serv)); + if (ret) + fprintf(stderr, "error: %s %i\n", gai_strerror(ret), ret); + else + printf("%s -- %s\n", host, serv); + + /* Interpret the result of the SRV lookup */ + ret = sd_resolve_res_done(resolve, q3, &srv); + if (ret < 0) { + fprintf(stderr, "error: %s %i\n", strerror(errno), ret); + } else if (ret == 0) { + fprintf(stderr, "No reply for SRV lookup\n"); + } else { + int qdcount; + int ancount; + int len; + const unsigned char *pos = srv + sizeof(HEADER); + unsigned char *end = srv + ret; + HEADER *head = (HEADER *)srv; + char name[256]; + + qdcount = ntohs(head->qdcount); + ancount = ntohs(head->ancount); + + printf("%d answers for srv lookup:\n", ancount); + + /* Ignore the questions */ + while (qdcount-- > 0 && (len = dn_expand(srv, end, pos, name, 255)) >= 0) { + assert(len >= 0); + pos += len + QFIXEDSZ; + } + + /* Parse the answers */ + while (ancount-- > 0 && (len = dn_expand(srv, end, pos, name, 255)) >= 0) { + /* Ignore the initial string */ + uint16_t pref, weight, port; + assert(len >= 0); + pos += len; + /* Ignore type, ttl, class and dlen */ + pos += 10; + + GETSHORT(pref, pos); + GETSHORT(weight, pos); + GETSHORT(port, pos); + len = dn_expand(srv, end, pos, name, 255); + printf("\tpreference: %2d weight: %2d port: %d host: %s\n", + pref, weight, port, name); + + pos += len; + } + } + + r = 0; + + return r; +} |