diff options
Diffstat (limited to 'src/libsystemd-bus/sd-dns.c')
| -rw-r--r-- | src/libsystemd-bus/sd-dns.c | 1158 |
1 files changed, 0 insertions, 1158 deletions
diff --git a/src/libsystemd-bus/sd-dns.c b/src/libsystemd-bus/sd-dns.c deleted file mode 100644 index 0f90d020ad..0000000000 --- a/src/libsystemd-bus/sd-dns.c +++ /dev/null @@ -1,1158 +0,0 @@ -/*-*- 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-dns.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 -} query_type_t; - -enum { - REQUEST_RECV_FD = 0, - REQUEST_SEND_FD = 1, - RESPONSE_RECV_FD = 2, - RESPONSE_SEND_FD = 3, - MESSAGE_FD_MAX = 4 -}; - -struct asyncns { - int fds[MESSAGE_FD_MAX]; - - pthread_t workers[MAX_WORKERS]; - unsigned valid_workers; - - unsigned current_id, current_index; - asyncns_query_t* queries[MAX_QUERIES]; - - asyncns_query_t *done_head, *done_tail; - - int n_queries; - int dead; -}; - -struct asyncns_query { - asyncns_t *asyncns; - int done; - unsigned id; - query_type_t type; - asyncns_query_t *done_next, *done_prev; - int ret; - int _errno; - int _h_errno; - struct addrinfo *addrinfo; - char *serv, *host; - void *userdata; -}; - -typedef struct rheader { - query_type_t type; - unsigned id; - size_t length; -} rheader_t; - -typedef struct addrinfo_request { - 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; -} addrinfo_request_t; - -typedef struct addrinfo_response { - struct rheader header; - int ret; - int _errno; - int _h_errno; - /* followed by addrinfo_serialization[] */ -} addrinfo_response_t; - -typedef struct addrinfo_serialization { - 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 */ -} addrinfo_serialization_t; - -typedef struct nameinfo_request { - struct rheader header; - int flags; - socklen_t sockaddr_len; - int gethost, getserv; -} nameinfo_request_t; - -typedef struct nameinfo_response { - struct rheader header; - size_t hostlen, servlen; - int ret; - int _errno; - int _h_errno; -} nameinfo_response_t; - -typedef struct res_request { - struct rheader header; - int class; - int type; - size_t dname_len; -} res_request_t; - -typedef struct res_response { - struct rheader header; - int ret; - int _errno; - int _h_errno; -} res_response_t; - -typedef union packet { - rheader_t rheader; - addrinfo_request_t addrinfo_request; - addrinfo_response_t addrinfo_response; - nameinfo_request_t nameinfo_request; - nameinfo_response_t nameinfo_response; - res_request_t res_request; - res_response_t res_response; -} packet_t; - -static int send_died(int out_fd) { - rheader_t 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) { - addrinfo_serialization_t 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(addrinfo_serialization_t) + 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(addrinfo_serialization_t)); - memcpy((uint8_t*) p + sizeof(addrinfo_serialization_t), ai->ai_addr, ai->ai_addrlen); - - if (ai->ai_canonname) - strcpy((char*) p + sizeof(addrinfo_serialization_t) + 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) { - addrinfo_response_t data[BUFSIZE/sizeof(addrinfo_response_t) + 1] = {}; - addrinfo_response_t *resp = data; - assert(out_fd >= 0); - - resp->header.type = RESPONSE_ADDRINFO; - resp->header.id = id; - resp->header.length = sizeof(addrinfo_response_t); - 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) { - nameinfo_response_t data[BUFSIZE/sizeof(nameinfo_response_t) + 1] = {}; - size_t hl, sl; - nameinfo_response_t *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(nameinfo_response_t) + 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(nameinfo_response_t), host, hl); - - if (serv) - memcpy((uint8_t *)data + sizeof(nameinfo_response_t) + 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) { - res_response_t data[BUFSIZE/sizeof(res_response_t) + 1] = {}; - res_response_t *resp = data; - - assert(out_fd >= 0); - - resp->header.type = RESPONSE_RES; - resp->header.id = id; - resp->header.length = sizeof(res_response_t) + (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(res_response_t), answer, ret); - - return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL); -} - -static int handle_request(int out_fd, const packet_t *packet, size_t length) { - const rheader_t *req; - assert(out_fd >= 0); - - req = &packet->rheader; - assert(req); - assert(length >= sizeof(rheader_t)); - assert(length == req->length); - - switch (req->type) { - case REQUEST_ADDRINFO: { - struct addrinfo ai = {}, *result = NULL; - const addrinfo_request_t *ai_req = &packet->addrinfo_request; - const char *node, *service; - int ret; - - assert(length >= sizeof(addrinfo_request_t)); - assert(length == sizeof(addrinfo_request_t) + 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(addrinfo_request_t) : NULL; - service = ai_req->service_len ? (const char*) ai_req + sizeof(addrinfo_request_t) + 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 nameinfo_request_t *ni_req = &packet->nameinfo_request; - char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; - struct sockaddr_storage sa; - - assert(length >= sizeof(nameinfo_request_t)); - assert(length == sizeof(nameinfo_request_t) + ni_req->sockaddr_len); - - memcpy(&sa, (const uint8_t *) ni_req + sizeof(nameinfo_request_t), 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 res_request_t *res_req = &packet->res_request; - const char *dname; - - assert(length >= sizeof(res_request_t)); - assert(length == sizeof(res_request_t) + res_req->dname_len); - - dname = (const char *) req + sizeof(res_request_t); - - 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) { - asyncns_t *asyncns = p; - sigset_t fullset; - - /* No signals in this thread please */ - sigfillset(&fullset); - pthread_sigmask(SIG_BLOCK, &fullset, NULL); - - while (!asyncns->dead) { - packet_t buf[BUFSIZE/sizeof(packet_t) + 1]; - ssize_t length; - - length = recv(asyncns->fds[REQUEST_RECV_FD], buf, sizeof(buf), 0); - - if (length <= 0) { - if (length < 0 && (errno == EAGAIN || errno == EINTR)) - continue; - break; - } - - if (asyncns->dead) - break; - - if (handle_request(asyncns->fds[RESPONSE_SEND_FD], buf, (size_t) length) < 0) - break; - } - - send_died(asyncns->fds[RESPONSE_SEND_FD]); - - return NULL; -} - -asyncns_t* asyncns_new(unsigned n_proc) { - int i; - asyncns_t *asyncns = NULL; - - assert(n_proc >= 1); - - if (n_proc > MAX_WORKERS) - n_proc = MAX_WORKERS; - - asyncns = malloc(sizeof(asyncns_t)); - if (!asyncns) { - errno = ENOMEM; - goto fail; - } - - asyncns->dead = 0; - asyncns->valid_workers = 0; - - for (i = 0; i < MESSAGE_FD_MAX; i++) - asyncns->fds[i] = -1; - - memset(asyncns->queries, 0, sizeof(asyncns->queries)); - -#ifdef SOCK_CLOEXEC - if (socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, asyncns->fds) < 0 || - socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, asyncns->fds+2) < 0) { - - /* Try again, without SOCK_CLOEXEC */ - if (errno == EINVAL) { -#endif - if (socketpair(PF_UNIX, SOCK_DGRAM, 0, asyncns->fds) < 0 || - socketpair(PF_UNIX, SOCK_DGRAM, 0, asyncns->fds+2) < 0) - goto fail; -#ifdef SOCK_CLOEXEC - } else - goto fail; - } -#endif - - for (i = 0; i < MESSAGE_FD_MAX; i++) - fd_cloexec(asyncns->fds[i], true); - - for (asyncns->valid_workers = 0; asyncns->valid_workers < n_proc; asyncns->valid_workers++) { - int r; - r = pthread_create(&asyncns->workers[asyncns->valid_workers], NULL, thread_worker, asyncns); - if (r) { - errno = r; - goto fail; - } - } - - asyncns->current_index = asyncns->current_id = 0; - asyncns->done_head = asyncns->done_tail = NULL; - asyncns->n_queries = 0; - - fd_nonblock(asyncns->fds[RESPONSE_RECV_FD], true); - - return asyncns; - -fail: - if (asyncns) - asyncns_free(asyncns); - - return NULL; -} - -void asyncns_free(asyncns_t *asyncns) { - int i; - int saved_errno = errno; - unsigned p; - - assert(asyncns); - - asyncns->dead = 1; - - if (asyncns->fds[REQUEST_SEND_FD] >= 0) { - rheader_t req = {}; - - req.type = REQUEST_TERMINATE; - req.length = sizeof(req); - req.id = 0; - - /* Send one termination packet for each worker */ - for (p = 0; p < asyncns->valid_workers; p++) - send(asyncns->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); - } - - /* Now terminate them and wait until they are gone. */ - for (p = 0; p < asyncns->valid_workers; p++) { - for (;;) { - if (pthread_join(asyncns->workers[p], NULL) != EINTR) - break; - } - } - - /* Close all communication channels */ - for (i = 0; i < MESSAGE_FD_MAX; i++) - if (asyncns->fds[i] >= 0) - close(asyncns->fds[i]); - - for (p = 0; p < MAX_QUERIES; p++) - if (asyncns->queries[p]) - asyncns_cancel(asyncns, asyncns->queries[p]); - - free(asyncns); - - errno = saved_errno; -} - -int asyncns_fd(asyncns_t *asyncns) { - assert(asyncns); - - return asyncns->fds[RESPONSE_RECV_FD]; -} - -static asyncns_query_t *lookup_query(asyncns_t *asyncns, unsigned id) { - asyncns_query_t *q; - assert(asyncns); - - q = asyncns->queries[id % MAX_QUERIES]; - if (q) - if (q->id == id) - return q; - - return NULL; -} - -static void complete_query(asyncns_t *asyncns, asyncns_query_t *q) { - assert(asyncns); - assert(q); - assert(!q->done); - - q->done = 1; - - if ((q->done_prev = asyncns->done_tail)) - asyncns->done_tail->done_next = q; - else - asyncns->done_head = q; - - asyncns->done_tail = q; - q->done_next = NULL; -} - -static const void *unserialize_addrinfo(const void *p, struct addrinfo **ret_ai, size_t *length) { - addrinfo_serialization_t s; - size_t l; - struct addrinfo *ai; - assert(p); - assert(ret_ai); - assert(length); - - if (*length < sizeof(addrinfo_serialization_t)) - return NULL; - - memcpy(&s, p, sizeof(s)); - - l = sizeof(addrinfo_serialization_t) + s.ai_addrlen + s.canonname_len; - if (*length < l) - return NULL; - - ai = malloc(sizeof(struct addrinfo)); - 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(addrinfo_serialization_t), s.ai_addrlen); - - if (ai->ai_canonname) - memcpy(ai->ai_canonname, (const uint8_t*) p + sizeof(addrinfo_serialization_t) + s.ai_addrlen, s.canonname_len); - - *length -= l; - *ret_ai = ai; - - return (const uint8_t*) p + l; - - -fail: - if (ai) - asyncns_freeaddrinfo(ai); - - return NULL; -} - -static int handle_response(asyncns_t *asyncns, const packet_t *packet, size_t length) { - const rheader_t *resp; - asyncns_query_t *q; - - assert(asyncns); - - resp = &packet->rheader; - assert(resp); - assert(length >= sizeof(rheader_t)); - assert(length == resp->length); - - if (resp->type == RESPONSE_DIED) { - asyncns->dead = 1; - return 0; - } - - q = lookup_query(asyncns, resp->id); - if (!q) - return 0; - - switch (resp->type) { - case RESPONSE_ADDRINFO: { - const addrinfo_response_t *ai_resp = &packet->addrinfo_response; - const void *p; - size_t l; - struct addrinfo *prev = NULL; - - assert(length >= sizeof(addrinfo_response_t)); - 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(addrinfo_response_t); - p = (const uint8_t*) resp + sizeof(addrinfo_response_t); - - 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(asyncns, q); - break; - } - - case RESPONSE_NAMEINFO: { - const nameinfo_response_t *ni_resp = &packet->nameinfo_response; - - assert(length >= sizeof(nameinfo_response_t)); - 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(nameinfo_response_t), ni_resp->hostlen-1))) - q->ret = EAI_MEMORY; - - if (ni_resp->servlen) - if (!(q->serv = strndup((const char*) ni_resp + sizeof(nameinfo_response_t) + ni_resp->hostlen, ni_resp->servlen-1))) - q->ret = EAI_MEMORY; - - complete_query(asyncns, q); - break; - } - - case RESPONSE_RES: { - const res_response_t *res_resp = &packet->res_response; - - assert(length >= sizeof(res_response_t)); - 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(res_response_t), res_resp->ret); - } - - complete_query(asyncns, q); - break; - } - - default: - ; - } - - return 0; -} - -int asyncns_wait(asyncns_t *asyncns, int block) { - int handled = 0; - assert(asyncns); - - for (;;) { - packet_t buf[BUFSIZE/sizeof(packet_t) + 1]; - ssize_t l; - - if (asyncns->dead) { - errno = ECHILD; - return -1; - } - - l = recv(asyncns->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(asyncns->fds[RESPONSE_RECV_FD], &fds); - - if (select(asyncns->fds[RESPONSE_RECV_FD]+1, &fds, NULL, NULL, NULL) < 0) - return -1; - - continue; - } - - if (handle_response(asyncns, buf, (size_t) l) < 0) - return -1; - - handled = 1; - } -} - -static asyncns_query_t *alloc_query(asyncns_t *asyncns) { - asyncns_query_t *q; - assert(asyncns); - - if (asyncns->n_queries >= MAX_QUERIES) { - errno = ENOMEM; - return NULL; - } - - while (asyncns->queries[asyncns->current_index]) { - asyncns->current_index++; - asyncns->current_id++; - - while (asyncns->current_index >= MAX_QUERIES) - asyncns->current_index -= MAX_QUERIES; - } - - q = asyncns->queries[asyncns->current_index] = malloc(sizeof(asyncns_query_t)); - if (!q) { - errno = ENOMEM; - return NULL; - } - - asyncns->n_queries++; - - q->asyncns = asyncns; - q->done = 0; - q->id = asyncns->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; -} - -asyncns_query_t* asyncns_getaddrinfo(asyncns_t *asyncns, const char *node, const char *service, const struct addrinfo *hints) { - addrinfo_request_t data[BUFSIZE/sizeof(addrinfo_request_t) + 1] = {}; - addrinfo_request_t *req = data; - asyncns_query_t *q; - assert(asyncns); - assert(node || service); - - if (asyncns->dead) { - errno = ECHILD; - return NULL; - } - - q = alloc_query(asyncns); - 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(addrinfo_request_t) + 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(addrinfo_request_t), node); - - if (service) - strcpy((char*) req + sizeof(addrinfo_request_t) + req->node_len, service); - - if (send(asyncns->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0) - goto fail; - - return q; - -fail: - if (q) - asyncns_cancel(asyncns, q); - - return NULL; -} - -int asyncns_getaddrinfo_done(asyncns_t *asyncns, asyncns_query_t* q, struct addrinfo **ret_res) { - int ret; - assert(asyncns); - assert(q); - assert(q->asyncns == asyncns); - assert(q->type == REQUEST_ADDRINFO); - - if (asyncns->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; - - asyncns_cancel(asyncns, q); - - return ret; -} - -asyncns_query_t* asyncns_getnameinfo(asyncns_t *asyncns, const struct sockaddr *sa, socklen_t salen, int flags, int gethost, int getserv) { - nameinfo_request_t data[BUFSIZE/sizeof(nameinfo_request_t) + 1] = {}; - nameinfo_request_t *req = data; - asyncns_query_t *q; - - assert(asyncns); - assert(sa); - assert(salen > 0); - - if (asyncns->dead) { - errno = ECHILD; - return NULL; - } - - q = alloc_query(asyncns); - if (!q) - return NULL; - - req->header.id = q->id; - req->header.type = q->type = REQUEST_NAMEINFO; - req->header.length = sizeof(nameinfo_request_t) + 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(nameinfo_request_t), sa, salen); - - if (send(asyncns->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0) - goto fail; - - return q; - -fail: - if (q) - asyncns_cancel(asyncns, q); - - return NULL; -} - -int asyncns_getnameinfo_done(asyncns_t *asyncns, asyncns_query_t* q, char *ret_host, size_t hostlen, char *ret_serv, size_t servlen) { - int ret; - assert(asyncns); - assert(q); - assert(q->asyncns == asyncns); - assert(q->type == REQUEST_NAMEINFO); - assert(!ret_host || hostlen); - assert(!ret_serv || servlen); - - if (asyncns->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; - - asyncns_cancel(asyncns, q); - - return ret; -} - -static asyncns_query_t * asyncns_res(asyncns_t *asyncns, query_type_t qtype, const char *dname, int class, int type) { - res_request_t data[BUFSIZE/sizeof(res_request_t) + 1]; - res_request_t *req = data; - asyncns_query_t *q; - - assert(asyncns); - assert(dname); - - if (asyncns->dead) { - errno = ECHILD; - return NULL; - } - - q = alloc_query(asyncns); - 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(res_request_t) + req->dname_len; - - if (req->header.length > BUFSIZE) { - errno = ENOMEM; - goto fail; - } - - req->class = class; - req->type = type; - - strcpy((char*) req + sizeof(res_request_t), dname); - - if (send(asyncns->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0) - goto fail; - - return q; - -fail: - if (q) - asyncns_cancel(asyncns, q); - - return NULL; -} - -asyncns_query_t* asyncns_res_query(asyncns_t *asyncns, const char *dname, int class, int type) { - return asyncns_res(asyncns, REQUEST_RES_QUERY, dname, class, type); -} - -asyncns_query_t* asyncns_res_search(asyncns_t *asyncns, const char *dname, int class, int type) { - return asyncns_res(asyncns, REQUEST_RES_SEARCH, dname, class, type); -} - -int asyncns_res_done(asyncns_t *asyncns, asyncns_query_t* q, unsigned char **answer) { - int ret; - assert(asyncns); - assert(q); - assert(q->asyncns == asyncns); - assert(q->type == REQUEST_RES_QUERY || q->type == REQUEST_RES_SEARCH); - assert(answer); - - if (asyncns->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; - } - - asyncns_cancel(asyncns, q); - - return ret < 0 ? -errno : ret; -} - -asyncns_query_t* asyncns_getnext(asyncns_t *asyncns) { - assert(asyncns); - return asyncns->done_head; -} - -int asyncns_getnqueries(asyncns_t *asyncns) { - assert(asyncns); - return asyncns->n_queries; -} - -void asyncns_cancel(asyncns_t *asyncns, asyncns_query_t* q) { - int i; - int saved_errno = errno; - - assert(asyncns); - assert(q); - assert(q->asyncns == asyncns); - assert(asyncns->n_queries > 0); - - if (q->done) { - - if (q->done_prev) - q->done_prev->done_next = q->done_next; - else - asyncns->done_head = q->done_next; - - if (q->done_next) - q->done_next->done_prev = q->done_prev; - else - asyncns->done_tail = q->done_prev; - } - - i = q->id % MAX_QUERIES; - assert(asyncns->queries[i] == q); - asyncns->queries[i] = NULL; - - asyncns_freeaddrinfo(q->addrinfo); - free(q->host); - free(q->serv); - - asyncns->n_queries--; - free(q); - - errno = saved_errno; -} - -void asyncns_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; -} - -void asyncns_freeanswer(unsigned char *answer) { - int saved_errno = errno; - - if (!answer) - return; - - /* Please note that this function is new in libasyncns 0.4. In - * older versions you were supposed to free the answer directly - * with free(). Hence, if this function is changed to do more than - * just a simple free() this must be considered ABI/API breakage! */ - - free(answer); - - errno = saved_errno; -} - -int asyncns_isdone(asyncns_t *asyncns, asyncns_query_t*q) { - assert(asyncns); - assert(q); - assert(q->asyncns == asyncns); - - return q->done; -} - -void asyncns_setuserdata(asyncns_t *asyncns, asyncns_query_t *q, void *userdata) { - assert(q); - assert(asyncns); - assert(q->asyncns = asyncns); - - q->userdata = userdata; -} - -void* asyncns_getuserdata(asyncns_t *asyncns, asyncns_query_t *q) { - assert(q); - assert(asyncns); - assert(q->asyncns = asyncns); - - return q->userdata; -} |