diff options
Diffstat (limited to 'src/libsystemd/sd-resolve/sd-resolve.c')
| -rw-r--r-- | src/libsystemd/sd-resolve/sd-resolve.c | 1426 |
1 files changed, 0 insertions, 1426 deletions
diff --git a/src/libsystemd/sd-resolve/sd-resolve.c b/src/libsystemd/sd-resolve/sd-resolve.c deleted file mode 100644 index b0dc82259..000000000 --- a/src/libsystemd/sd-resolve/sd-resolve.c +++ /dev/null @@ -1,1426 +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 <signal.h> -#include <unistd.h> -#include <stdio.h> -#include <string.h> -#include <stdlib.h> -#include <errno.h> -#include <resolv.h> -#include <stdint.h> -#include <pthread.h> -#include <sys/prctl.h> -#include <poll.h> - -#include "util.h" -#include "list.h" -#include "socket-util.h" -#include "missing.h" -#include "resolve-util.h" -#include "sd-resolve.h" - -#define WORKERS_MIN 1U -#define WORKERS_MAX 16U -#define QUERIES_MAX 256U -#define BUFSIZE 10240U - -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, - REQUEST_SEND_FD, - RESPONSE_RECV_FD, - RESPONSE_SEND_FD, - _FD_MAX -}; - -struct sd_resolve { - unsigned n_ref; - - bool dead:1; - pid_t original_pid; - - int fds[_FD_MAX]; - - pthread_t workers[WORKERS_MAX]; - unsigned n_valid_workers; - - unsigned current_id; - sd_resolve_query* query_array[QUERIES_MAX]; - unsigned n_queries, n_done, n_outstanding; - - sd_event_source *event_source; - sd_event *event; - - sd_resolve_query *current; - - sd_resolve **default_resolve_ptr; - pid_t tid; - - LIST_HEAD(sd_resolve_query, queries); -}; - -struct sd_resolve_query { - unsigned n_ref; - - sd_resolve *resolve; - - QueryType type:4; - bool done:1; - bool floating:1; - unsigned id; - - int ret; - int _errno; - int _h_errno; - struct addrinfo *addrinfo; - char *serv, *host; - unsigned char *answer; - - union { - sd_resolve_getaddrinfo_handler_t getaddrinfo_handler; - sd_resolve_getnameinfo_handler_t getnameinfo_handler; - sd_resolve_res_handler_t res_handler; - }; - - void *userdata; - - LIST_FIELDS(sd_resolve_query, queries); -}; - -typedef struct RHeader { - QueryType type; - unsigned id; - size_t length; -} RHeader; - -typedef struct AddrInfoRequest { - struct RHeader header; - bool hints_valid; - 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; - bool gethost:1, getserv:1; -} 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 getaddrinfo_done(sd_resolve_query* q); -static int getnameinfo_done(sd_resolve_query *q); -static int res_query_done(sd_resolve_query* q); - -static void resolve_query_disconnect(sd_resolve_query *q); - -#define RESOLVE_DONT_DESTROY(resolve) \ - _cleanup_resolve_unref_ _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) - -static int send_died(int out_fd) { - - RHeader rh = { - .type = RESPONSE_DIED, - .length = sizeof(RHeader), - }; - - assert(out_fd >= 0); - - if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0) - return -errno; - - return 0; -} - -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) - memcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, ai->ai_canonname, cnl); - - *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 resp = { - .header.type = RESPONSE_ADDRINFO, - .header.id = id, - .header.length = sizeof(AddrInfoResponse), - .ret = ret, - ._errno = _errno, - ._h_errno = _h_errno, - }; - - struct msghdr mh = {}; - struct iovec iov[2]; - union { - AddrInfoSerialization ais; - uint8_t space[BUFSIZE]; - } buffer; - - assert(out_fd >= 0); - - if (ret == 0 && ai) { - void *p = &buffer; - struct addrinfo *k; - - for (k = ai; k; k = k->ai_next) { - p = serialize_addrinfo(p, k, &resp.header.length, (uint8_t*) &buffer + BUFSIZE - (uint8_t*) p); - if (!p) { - freeaddrinfo(ai); - return -ENOBUFS; - } - } - } - - if (ai) - freeaddrinfo(ai); - - iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(AddrInfoResponse) }; - iov[1] = (struct iovec) { .iov_base = &buffer, .iov_len = resp.header.length - sizeof(AddrInfoResponse) }; - - mh.msg_iov = iov; - mh.msg_iovlen = ELEMENTSOF(iov); - - if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) - return -errno; - - return 0; -} - -static int send_nameinfo_reply( - int out_fd, - unsigned id, - int ret, - const char *host, - const char *serv, - int _errno, - int _h_errno) { - - NameInfoResponse resp = { - .header.type = RESPONSE_NAMEINFO, - .header.id = id, - .ret = ret, - ._errno = _errno, - ._h_errno = _h_errno, - }; - - struct msghdr mh = {}; - struct iovec iov[3]; - size_t hl, sl; - - assert(out_fd >= 0); - - sl = serv ? strlen(serv)+1 : 0; - hl = host ? strlen(host)+1 : 0; - - resp.header.length = sizeof(NameInfoResponse) + hl + sl; - resp.hostlen = hl; - resp.servlen = sl; - - iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(NameInfoResponse) }; - iov[1] = (struct iovec) { .iov_base = (void*) host, .iov_len = hl }; - iov[2] = (struct iovec) { .iov_base = (void*) serv, .iov_len = sl }; - - mh.msg_iov = iov; - mh.msg_iovlen = ELEMENTSOF(iov); - - if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) - return -errno; - - return 0; -} - -static int send_res_reply(int out_fd, unsigned id, const unsigned char *answer, int ret, int _errno, int _h_errno) { - - ResResponse resp = { - .header.type = RESPONSE_RES, - .header.id = id, - .ret = ret, - ._errno = _errno, - ._h_errno = _h_errno, - }; - - struct msghdr mh = {}; - struct iovec iov[2]; - size_t l; - - assert(out_fd >= 0); - - l = ret > 0 ? (size_t) ret : 0; - - resp.header.length = sizeof(ResResponse) + l; - - iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(ResResponse) }; - iov[1] = (struct iovec) { .iov_base = (void*) answer, .iov_len = l }; - - mh.msg_iov = iov; - mh.msg_iovlen = ELEMENTSOF(iov); - - if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) - return -errno; - - return 0; -} - -static int handle_request(int out_fd, const Packet *packet, size_t length) { - const RHeader *req; - - assert(out_fd >= 0); - assert(packet); - - req = &packet->rheader; - - assert(length >= sizeof(RHeader)); - assert(length == req->length); - - switch (req->type) { - - case REQUEST_ADDRINFO: { - const AddrInfoRequest *ai_req = &packet->addrinfo_request; - struct addrinfo hints = {}, *result = NULL; - const char *node, *service; - int ret; - - assert(length >= sizeof(AddrInfoRequest)); - assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len); - - hints.ai_flags = ai_req->ai_flags; - hints.ai_family = ai_req->ai_family; - hints.ai_socktype = ai_req->ai_socktype; - hints.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_valid ? &hints : NULL, - &result); - - /* send_addrinfo_reply() frees result */ - return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno); - } - - case REQUEST_NAMEINFO: { - const NameInfoRequest *ni_req = &packet->nameinfo_request; - char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; - union sockaddr_union sa; - int ret; - - assert(length >= sizeof(NameInfoRequest)); - assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len); - assert(sizeof(sa) >= ni_req->sockaddr_len); - - memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len); - - ret = getnameinfo(&sa.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: { - const ResRequest *res_req = &packet->res_request; - union { - HEADER header; - uint8_t space[BUFSIZE]; - } answer; - const char *dname; - int ret; - - assert(length >= sizeof(ResRequest)); - assert(length == sizeof(ResRequest) + res_req->dname_len); - - dname = (const char *) res_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 -ECONNRESET; - - default: - assert_not_reached("Unknown request"); - } - - return 0; -} - -static void* thread_worker(void *p) { - sd_resolve *resolve = p; - sigset_t fullset; - - /* No signals in this thread please */ - assert_se(sigfillset(&fullset) == 0); - assert_se(pthread_sigmask(SIG_BLOCK, &fullset, NULL) == 0); - - /* Assign a pretty name to this thread */ - prctl(PR_SET_NAME, (unsigned long) "sd-resolve"); - - while (!resolve->dead) { - union { - Packet packet; - uint8_t space[BUFSIZE]; - } buf; - ssize_t length; - - length = recv(resolve->fds[REQUEST_RECV_FD], &buf, sizeof(buf), 0); - if (length < 0) { - if (errno == EINTR) - continue; - - break; - } - if (length == 0) - break; - - if (resolve->dead) - break; - - if (handle_request(resolve->fds[RESPONSE_SEND_FD], &buf.packet, (size_t) length) < 0) - break; - } - - send_died(resolve->fds[RESPONSE_SEND_FD]); - - return NULL; -} - -static int start_threads(sd_resolve *resolve, unsigned extra) { - unsigned n; - int r; - - n = resolve->n_outstanding + extra; - n = CLAMP(n, WORKERS_MIN, WORKERS_MAX); - - while (resolve->n_valid_workers < n) { - - r = pthread_create(&resolve->workers[resolve->n_valid_workers], NULL, thread_worker, resolve); - if (r != 0) - return -r; - - resolve->n_valid_workers ++; - } - - return 0; -} - -static bool resolve_pid_changed(sd_resolve *r) { - assert(r); - - /* We don't support people creating a resolver and keeping it - * around after fork(). Let's complain. */ - - return r->original_pid != getpid(); -} - -_public_ int sd_resolve_new(sd_resolve **ret) { - sd_resolve *resolve = NULL; - int i, r; - - assert_return(ret, -EINVAL); - - resolve = new0(sd_resolve, 1); - if (!resolve) - return -ENOMEM; - - resolve->n_ref = 1; - resolve->original_pid = getpid(); - - for (i = 0; i < _FD_MAX; i++) - resolve->fds[i] = -1; - - r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + REQUEST_RECV_FD); - if (r < 0) { - r = -errno; - goto fail; - } - - r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + RESPONSE_RECV_FD); - if (r < 0) { - r = -errno; - goto fail; - } - - fd_inc_sndbuf(resolve->fds[REQUEST_SEND_FD], QUERIES_MAX * BUFSIZE); - fd_inc_rcvbuf(resolve->fds[REQUEST_RECV_FD], QUERIES_MAX * BUFSIZE); - fd_inc_sndbuf(resolve->fds[RESPONSE_SEND_FD], QUERIES_MAX * BUFSIZE); - fd_inc_rcvbuf(resolve->fds[RESPONSE_RECV_FD], QUERIES_MAX * BUFSIZE); - - fd_nonblock(resolve->fds[RESPONSE_RECV_FD], true); - - *ret = resolve; - return 0; - -fail: - sd_resolve_unref(resolve); - return r; -} - -_public_ int sd_resolve_default(sd_resolve **ret) { - - static thread_local sd_resolve *default_resolve = NULL; - sd_resolve *e = NULL; - int r; - - if (!ret) - return !!default_resolve; - - if (default_resolve) { - *ret = sd_resolve_ref(default_resolve); - return 0; - } - - r = sd_resolve_new(&e); - if (r < 0) - return r; - - e->default_resolve_ptr = &default_resolve; - e->tid = gettid(); - default_resolve = e; - - *ret = e; - return 1; -} - -_public_ int sd_resolve_get_tid(sd_resolve *resolve, pid_t *tid) { - assert_return(resolve, -EINVAL); - assert_return(tid, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - if (resolve->tid != 0) { - *tid = resolve->tid; - return 0; - } - - if (resolve->event) - return sd_event_get_tid(resolve->event, tid); - - return -ENXIO; -} - -static void resolve_free(sd_resolve *resolve) { - PROTECT_ERRNO; - sd_resolve_query *q; - unsigned i; - - assert(resolve); - - while ((q = resolve->queries)) { - assert(q->floating); - resolve_query_disconnect(q); - sd_resolve_query_unref(q); - } - - if (resolve->default_resolve_ptr) - *(resolve->default_resolve_ptr) = NULL; - - resolve->dead = true; - - sd_resolve_detach_event(resolve); - - if (resolve->fds[REQUEST_SEND_FD] >= 0) { - - RHeader req = { - .type = REQUEST_TERMINATE, - .length = sizeof(req) - }; - - /* Send one termination packet for each worker */ - for (i = 0; i < resolve->n_valid_workers; i++) - (void) send(resolve->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); - } - - /* Now terminate them and wait until they are gone. */ - for (i = 0; i < resolve->n_valid_workers; i++) { - for (;;) { - if (pthread_join(resolve->workers[i], NULL) != EINTR) - break; - } - } - - /* Close all communication channels */ - for (i = 0; i < _FD_MAX; i++) - safe_close(resolve->fds[i]); - - free(resolve); -} - -_public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { - assert_return(resolve, NULL); - - assert(resolve->n_ref >= 1); - resolve->n_ref++; - - return resolve; -} - -_public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { - - if (!resolve) - return NULL; - - assert(resolve->n_ref >= 1); - resolve->n_ref--; - - if (resolve->n_ref <= 0) - resolve_free(resolve); - - return NULL; -} - -_public_ int sd_resolve_get_fd(sd_resolve *resolve) { - assert_return(resolve, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - return resolve->fds[RESPONSE_RECV_FD]; -} - -_public_ int sd_resolve_get_events(sd_resolve *resolve) { - assert_return(resolve, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - return resolve->n_queries > resolve->n_done ? POLLIN : 0; -} - -_public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { - assert_return(resolve, -EINVAL); - assert_return(usec, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - *usec = (uint64_t) -1; - return 0; -} - -static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { - sd_resolve_query *q; - - assert(resolve); - - q = resolve->query_array[id % QUERIES_MAX]; - if (q) - if (q->id == id) - return q; - - return NULL; -} - -static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { - int r; - - assert(q); - assert(!q->done); - assert(q->resolve == resolve); - - q->done = true; - resolve->n_done ++; - - resolve->current = sd_resolve_query_ref(q); - - switch (q->type) { - - case REQUEST_ADDRINFO: - r = getaddrinfo_done(q); - break; - - case REQUEST_NAMEINFO: - r = getnameinfo_done(q); - break; - - case REQUEST_RES_QUERY: - case REQUEST_RES_SEARCH: - r = res_query_done(q); - break; - - default: - assert_not_reached("Cannot complete unknown query type"); - } - - resolve->current = NULL; - - if (q->floating) { - resolve_query_disconnect(q); - sd_resolve_query_unref(q); - } - - sd_resolve_query_unref(q); - - return r; -} - -static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { - AddrInfoSerialization s; - size_t l; - struct addrinfo *ai; - - assert(p); - assert(*p); - assert(ret_ai); - assert(length); - - if (*length < sizeof(AddrInfoSerialization)) - return -EBADMSG; - - memcpy(&s, *p, sizeof(s)); - - l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; - if (*length < l) - return -EBADMSG; - - ai = new0(struct addrinfo, 1); - if (!ai) - return -ENOMEM; - - 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 (s.ai_addrlen > 0) { - ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); - if (!ai->ai_addr) { - free(ai); - return -ENOMEM; - } - } - - if (s.canonname_len > 0) { - ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); - if (!ai->ai_canonname) { - free(ai->ai_addr); - free(ai); - return -ENOMEM; - } - } - - *length -= l; - *ret_ai = ai; - *p = ((const uint8_t*) *p) + l; - - return 0; -} - -static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { - const RHeader *resp; - sd_resolve_query *q; - int r; - - assert(resolve); - - resp = &packet->rheader; - assert(resp); - assert(length >= sizeof(RHeader)); - assert(length == resp->length); - - if (resp->type == RESPONSE_DIED) { - resolve->dead = true; - return 0; - } - - assert(resolve->n_outstanding > 0); - resolve->n_outstanding--; - - 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; - - r = unserialize_addrinfo(&p, &l, &ai); - if (r < 0) { - q->ret = EAI_SYSTEM; - q->_errno = -r; - q->_h_errno = 0; - freeaddrinfo(q->addrinfo); - q->addrinfo = NULL; - break; - } - - if (prev) - prev->ai_next = ai; - else - q->addrinfo = ai; - - prev = ai; - } - - return complete_query(resolve, q); - } - - 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 > 0) { - q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); - if (!q->host) { - q->ret = EAI_MEMORY; - q->_errno = ENOMEM; - q->_h_errno = 0; - } - } - - if (ni_resp->servlen > 0) { - q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); - if (!q->serv) { - q->ret = EAI_MEMORY; - q->_errno = ENOMEM; - q->_h_errno = 0; - } - } - - return complete_query(resolve, q); - } - - 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) { - q->answer = memdup((const char *)resp + sizeof(ResResponse), res_resp->ret); - if (!q->answer) { - q->ret = -1; - q->_errno = ENOMEM; - q->_h_errno = 0; - } - } - - return complete_query(resolve, q); - } - - default: - return 0; - } -} - -_public_ int sd_resolve_process(sd_resolve *resolve) { - RESOLVE_DONT_DESTROY(resolve); - - union { - Packet packet; - uint8_t space[BUFSIZE]; - } buf; - ssize_t l; - int r; - - assert_return(resolve, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - /* We don't allow recursively invoking sd_resolve_process(). */ - assert_return(!resolve->current, -EBUSY); - - l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); - if (l < 0) { - if (errno == EAGAIN) - return 0; - - return -errno; - } - if (l == 0) - return -ECONNREFUSED; - - r = handle_response(resolve, &buf.packet, (size_t) l); - if (r < 0) - return r; - - return 1; -} - -_public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { - int r; - - assert_return(resolve, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - if (resolve->n_done >= resolve->n_queries) - return 0; - - do { - r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); - } while (r == -EINTR); - - if (r < 0) - return r; - - return sd_resolve_process(resolve); -} - -static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { - sd_resolve_query *q; - int r; - - assert(resolve); - assert(_q); - - if (resolve->n_queries >= QUERIES_MAX) - return -ENOBUFS; - - r = start_threads(resolve, 1); - if (r < 0) - return r; - - while (resolve->query_array[resolve->current_id % QUERIES_MAX]) - resolve->current_id++; - - q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); - if (!q) - return -ENOMEM; - - q->n_ref = 1; - q->resolve = resolve; - q->floating = floating; - q->id = resolve->current_id++; - - if (!floating) - sd_resolve_ref(resolve); - - LIST_PREPEND(queries, resolve->queries, q); - resolve->n_queries++; - - *_q = q; - return 0; -} - -_public_ int sd_resolve_getaddrinfo( - sd_resolve *resolve, - sd_resolve_query **_q, - const char *node, const char *service, - const struct addrinfo *hints, - sd_resolve_getaddrinfo_handler_t callback, void *userdata) { - - AddrInfoRequest req = {}; - struct msghdr mh = {}; - struct iovec iov[3]; - sd_resolve_query *q; - int r; - - assert_return(resolve, -EINVAL); - assert_return(node || service, -EINVAL); - assert_return(callback, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - r = alloc_query(resolve, !_q, &q); - if (r < 0) - return r; - - q->type = REQUEST_ADDRINFO; - q->getaddrinfo_handler = callback; - q->userdata = userdata; - - req.node_len = node ? strlen(node)+1 : 0; - req.service_len = service ? strlen(service)+1 : 0; - - req.header.id = q->id; - req.header.type = REQUEST_ADDRINFO; - req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; - - if (hints) { - req.hints_valid = true; - req.ai_flags = hints->ai_flags; - req.ai_family = hints->ai_family; - req.ai_socktype = hints->ai_socktype; - req.ai_protocol = hints->ai_protocol; - } - - iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; - if (node) - iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; - if (service) - iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; - mh.msg_iov = iov; - - if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { - sd_resolve_query_unref(q); - return -errno; - } - - resolve->n_outstanding++; - - if (_q) - *_q = q; - - return 0; -} - -static int getaddrinfo_done(sd_resolve_query* q) { - assert(q); - assert(q->done); - assert(q->getaddrinfo_handler); - - errno = q->_errno; - h_errno = q->_h_errno; - - return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); -} - -_public_ int sd_resolve_getnameinfo( - sd_resolve *resolve, - sd_resolve_query**_q, - const struct sockaddr *sa, socklen_t salen, - int flags, - uint64_t get, - sd_resolve_getnameinfo_handler_t callback, - void *userdata) { - - NameInfoRequest req = {}; - struct msghdr mh = {}; - struct iovec iov[2]; - sd_resolve_query *q; - int r; - - assert_return(resolve, -EINVAL); - assert_return(sa, -EINVAL); - assert_return(salen >= sizeof(struct sockaddr), -EINVAL); - assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); - assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); - assert_return(callback, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - r = alloc_query(resolve, !_q, &q); - if (r < 0) - return r; - - q->type = REQUEST_NAMEINFO; - q->getnameinfo_handler = callback; - q->userdata = userdata; - - req.header.id = q->id; - req.header.type = REQUEST_NAMEINFO; - req.header.length = sizeof(NameInfoRequest) + salen; - - req.flags = flags; - req.sockaddr_len = salen; - req.gethost = !!(get & SD_RESOLVE_GET_HOST); - req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); - - iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; - iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; - - mh.msg_iov = iov; - mh.msg_iovlen = 2; - - if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { - sd_resolve_query_unref(q); - return -errno; - } - - resolve->n_outstanding++; - - if (_q) - *_q = q; - - return 0; -} - -static int getnameinfo_done(sd_resolve_query *q) { - - assert(q); - assert(q->done); - assert(q->getnameinfo_handler); - - errno = q->_errno; - h_errno= q->_h_errno; - - return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); -} - -static int resolve_res( - sd_resolve *resolve, - sd_resolve_query **_q, - QueryType qtype, - const char *dname, - int class, int type, - sd_resolve_res_handler_t callback, void *userdata) { - - struct msghdr mh = {}; - struct iovec iov[2]; - ResRequest req = {}; - sd_resolve_query *q; - int r; - - assert_return(resolve, -EINVAL); - assert_return(dname, -EINVAL); - assert_return(callback, -EINVAL); - assert_return(!resolve_pid_changed(resolve), -ECHILD); - - r = alloc_query(resolve, !_q, &q); - if (r < 0) - return r; - - q->type = qtype; - q->res_handler = callback; - q->userdata = userdata; - - req.dname_len = strlen(dname) + 1; - req.class = class; - req.type = type; - - req.header.id = q->id; - req.header.type = qtype; - req.header.length = sizeof(ResRequest) + req.dname_len; - - iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(ResRequest) }; - iov[1] = (struct iovec) { .iov_base = (void*) dname, .iov_len = req.dname_len }; - - mh.msg_iov = iov; - mh.msg_iovlen = 2; - - if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { - sd_resolve_query_unref(q); - return -errno; - } - - resolve->n_outstanding++; - - if (_q) - *_q = q; - - return 0; -} - -_public_ int sd_resolve_res_query(sd_resolve *resolve, sd_resolve_query** q, const char *dname, int class, int type, sd_resolve_res_handler_t callback, void *userdata) { - return resolve_res(resolve, q, REQUEST_RES_QUERY, dname, class, type, callback, userdata); -} - -_public_ int sd_resolve_res_search(sd_resolve *resolve, sd_resolve_query** q, const char *dname, int class, int type, sd_resolve_res_handler_t callback, void *userdata) { - return resolve_res(resolve, q, REQUEST_RES_SEARCH, dname, class, type, callback, userdata); -} - -static int res_query_done(sd_resolve_query* q) { - assert(q); - assert(q->done); - assert(q->res_handler); - - errno = q->_errno; - h_errno = q->_h_errno; - - return q->res_handler(q, q->ret, q->answer, q->userdata); -} - -_public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { - assert_return(q, NULL); - - assert(q->n_ref >= 1); - q->n_ref++; - - return q; -} - -static void resolve_freeaddrinfo(struct addrinfo *ai) { - while (ai) { - struct addrinfo *next = ai->ai_next; - - free(ai->ai_addr); - free(ai->ai_canonname); - free(ai); - ai = next; - } -} - -static void resolve_query_disconnect(sd_resolve_query *q) { - sd_resolve *resolve; - unsigned i; - - assert(q); - - if (!q->resolve) - return; - - resolve = q->resolve; - assert(resolve->n_queries > 0); - - if (q->done) { - assert(resolve->n_done > 0); - resolve->n_done--; - } - - i = q->id % QUERIES_MAX; - assert(resolve->query_array[i] == q); - resolve->query_array[i] = NULL; - LIST_REMOVE(queries, resolve->queries, q); - resolve->n_queries--; - - q->resolve = NULL; - if (!q->floating) - sd_resolve_unref(resolve); -} - -static void resolve_query_free(sd_resolve_query *q) { - assert(q); - - resolve_query_disconnect(q); - - resolve_freeaddrinfo(q->addrinfo); - free(q->host); - free(q->serv); - free(q->answer); - free(q); -} - -_public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { - if (!q) - return NULL; - - assert(q->n_ref >= 1); - q->n_ref--; - - if (q->n_ref <= 0) - resolve_query_free(q); - - return NULL; -} - -_public_ int sd_resolve_query_is_done(sd_resolve_query *q) { - assert_return(q, -EINVAL); - assert_return(!resolve_pid_changed(q->resolve), -ECHILD); - - return q->done; -} - -_public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { - void *ret; - - assert_return(q, NULL); - assert_return(!resolve_pid_changed(q->resolve), NULL); - - ret = q->userdata; - q->userdata = userdata; - - return ret; -} - -_public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { - assert_return(q, NULL); - assert_return(!resolve_pid_changed(q->resolve), NULL); - - return q->userdata; -} - -_public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { - assert_return(q, NULL); - assert_return(!resolve_pid_changed(q->resolve), NULL); - - return q->resolve; -} - -static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - sd_resolve *resolve = userdata; - int r; - - assert(resolve); - - r = sd_resolve_process(resolve); - if (r < 0) - return r; - - return 1; -} - -_public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int priority) { - int r; - - assert_return(resolve, -EINVAL); - assert_return(!resolve->event, -EBUSY); - - assert(!resolve->event_source); - - if (event) - resolve->event = sd_event_ref(event); - else { - r = sd_event_default(&resolve->event); - if (r < 0) - return r; - } - - r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); - if (r < 0) - goto fail; - - r = sd_event_source_set_priority(resolve->event_source, priority); - if (r < 0) - goto fail; - - return 0; - -fail: - sd_resolve_detach_event(resolve); - return r; -} - -_public_ int sd_resolve_detach_event(sd_resolve *resolve) { - assert_return(resolve, -EINVAL); - - if (!resolve->event) - return 0; - - if (resolve->event_source) { - sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); - resolve->event_source = sd_event_source_unref(resolve->event_source); - } - - resolve->event = sd_event_unref(resolve->event); - return 1; -} - -_public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { - assert_return(resolve, NULL); - - return resolve->event; -} |