1262 lines
35 KiB
C
1262 lines
35 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2005-2008 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/select.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <dirent.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <stdint.h>
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#include <pthread.h>
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#include <sys/prctl.h>
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#include <sys/poll.h>
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#include "util.h"
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#include "list.h"
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#include "socket-util.h"
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#include "sd-resolve.h"
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#define WORKERS_MIN 1
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#define WORKERS_MAX 16
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#define QUERIES_MAX 256
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#define BUFSIZE 10240
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typedef enum {
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REQUEST_ADDRINFO,
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RESPONSE_ADDRINFO,
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REQUEST_NAMEINFO,
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RESPONSE_NAMEINFO,
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REQUEST_RES_QUERY,
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REQUEST_RES_SEARCH,
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RESPONSE_RES,
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REQUEST_TERMINATE,
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RESPONSE_DIED
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} QueryType;
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enum {
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REQUEST_RECV_FD,
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REQUEST_SEND_FD,
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RESPONSE_RECV_FD,
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RESPONSE_SEND_FD,
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_FD_MAX
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};
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struct sd_resolve {
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bool dead:1;
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pid_t original_pid;
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int fds[_FD_MAX];
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pthread_t workers[WORKERS_MAX];
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unsigned n_valid_workers;
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unsigned current_id, current_index;
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sd_resolve_query* queries[QUERIES_MAX];
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unsigned n_queries;
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LIST_HEAD(sd_resolve_query, done);
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sd_resolve_query *done_tail;
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unsigned n_done;
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};
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struct sd_resolve_query {
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sd_resolve *resolve;
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bool done:1;
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unsigned id;
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QueryType type;
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int ret;
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int _errno;
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int _h_errno;
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struct addrinfo *addrinfo;
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char *serv, *host;
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void *userdata;
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LIST_FIELDS(sd_resolve_query, done);
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};
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typedef struct RHeader {
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QueryType type;
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unsigned id;
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size_t length;
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} RHeader;
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typedef struct AddrInfoRequest {
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struct RHeader header;
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bool hints_valid;
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int ai_flags;
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int ai_family;
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int ai_socktype;
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int ai_protocol;
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size_t node_len, service_len;
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} AddrInfoRequest;
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typedef struct AddrInfoResponse {
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struct RHeader header;
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int ret;
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int _errno;
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int _h_errno;
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/* followed by addrinfo_serialization[] */
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} AddrInfoResponse;
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typedef struct AddrInfoSerialization {
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int ai_flags;
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int ai_family;
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int ai_socktype;
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int ai_protocol;
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size_t ai_addrlen;
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size_t canonname_len;
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/* Followed by ai_addr amd ai_canonname with variable lengths */
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} AddrInfoSerialization;
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typedef struct NameInfoRequest {
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struct RHeader header;
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int flags;
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socklen_t sockaddr_len;
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bool gethost:1, getserv:1;
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} NameInfoRequest;
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typedef struct NameInfoResponse {
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struct RHeader header;
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size_t hostlen, servlen;
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int ret;
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int _errno;
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int _h_errno;
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} NameInfoResponse;
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typedef struct ResRequest {
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struct RHeader header;
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int class;
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int type;
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size_t dname_len;
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} ResRequest;
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typedef struct ResResponse {
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struct RHeader header;
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int ret;
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int _errno;
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int _h_errno;
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} ResResponse;
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typedef union Packet {
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RHeader rheader;
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AddrInfoRequest addrinfo_request;
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AddrInfoResponse addrinfo_response;
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NameInfoRequest nameinfo_request;
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NameInfoResponse nameinfo_response;
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ResRequest res_request;
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ResResponse res_response;
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} Packet;
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static int send_died(int out_fd) {
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RHeader rh = {};
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assert(out_fd >= 0);
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rh.type = RESPONSE_DIED;
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rh.length = sizeof(rh);
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if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0)
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return -errno;
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return 0;
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}
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static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) {
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AddrInfoSerialization s;
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size_t cnl, l;
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assert(p);
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assert(ai);
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assert(length);
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assert(*length <= maxlength);
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cnl = ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0;
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l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl;
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if (*length + l > maxlength)
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return NULL;
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s.ai_flags = ai->ai_flags;
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s.ai_family = ai->ai_family;
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s.ai_socktype = ai->ai_socktype;
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s.ai_protocol = ai->ai_protocol;
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s.ai_addrlen = ai->ai_addrlen;
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s.canonname_len = cnl;
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memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization));
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memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen);
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if (ai->ai_canonname)
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memcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, ai->ai_canonname, cnl);
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*length += l;
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return (uint8_t*) p + l;
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}
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static int send_addrinfo_reply(
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int out_fd,
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unsigned id,
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int ret,
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struct addrinfo *ai,
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int _errno,
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int _h_errno) {
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AddrInfoResponse resp = {};
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struct msghdr mh = {};
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struct iovec iov[2];
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union {
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AddrInfoSerialization ais;
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uint8_t space[BUFSIZE];
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} buffer;
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assert(out_fd >= 0);
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resp.header.type = RESPONSE_ADDRINFO;
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resp.header.id = id;
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resp.header.length = sizeof(AddrInfoResponse);
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resp.ret = ret;
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resp._errno = _errno;
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resp._h_errno = _h_errno;
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if (ret == 0 && ai) {
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void *p = &buffer;
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struct addrinfo *k;
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for (k = ai; k; k = k->ai_next) {
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p = serialize_addrinfo(p, k, &resp.header.length, (uint8_t*) &buffer + BUFSIZE - (uint8_t*) p);
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if (!p) {
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freeaddrinfo(ai);
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return -ENOBUFS;
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}
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}
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}
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if (ai)
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freeaddrinfo(ai);
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iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(AddrInfoResponse) };
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iov[1] = (struct iovec) { .iov_base = &buffer, .iov_len = resp.header.length - sizeof(AddrInfoResponse) };
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mh.msg_iov = iov;
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mh.msg_iovlen = ELEMENTSOF(iov);
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if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0)
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return -errno;
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return 0;
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}
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static int send_nameinfo_reply(
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int out_fd,
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unsigned id,
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int ret,
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const char *host,
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const char *serv,
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int _errno,
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int _h_errno) {
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NameInfoResponse resp = {};
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struct msghdr mh = {};
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struct iovec iov[3];
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size_t hl, sl;
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assert(out_fd >= 0);
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sl = serv ? strlen(serv)+1 : 0;
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hl = host ? strlen(host)+1 : 0;
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resp.header.type = RESPONSE_NAMEINFO;
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resp.header.id = id;
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resp.header.length = sizeof(NameInfoResponse) + hl + sl;
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resp.ret = ret;
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resp._errno = _errno;
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resp._h_errno = _h_errno;
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resp.hostlen = hl;
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resp.servlen = sl;
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iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(NameInfoResponse) };
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iov[1] = (struct iovec) { .iov_base = (void*) host, .iov_len = hl };
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iov[2] = (struct iovec) { .iov_base = (void*) serv, .iov_len = sl };
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mh.msg_iov = iov;
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mh.msg_iovlen = ELEMENTSOF(iov);
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if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0)
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return -errno;
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return 0;
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}
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static int send_res_reply(int out_fd, unsigned id, const unsigned char *answer, int ret, int _errno, int _h_errno) {
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struct msghdr mh = {};
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struct iovec iov[2];
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ResResponse resp = {};
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size_t l;
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assert(out_fd >= 0);
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l = ret > 0 ? (size_t) ret : 0;
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resp.header.type = RESPONSE_RES;
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resp.header.id = id;
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resp.header.length = sizeof(ResResponse) + l;
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resp.ret = ret;
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resp._errno = _errno;
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resp._h_errno = _h_errno;
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iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(ResResponse) };
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iov[1] = (struct iovec) { .iov_base = (void*) answer, .iov_len = l };
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mh.msg_iov = iov;
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mh.msg_iovlen = ELEMENTSOF(iov);
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if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0)
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return -errno;
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return 0;
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}
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static int handle_request(int out_fd, const Packet *packet, size_t length) {
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const RHeader *req;
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assert(out_fd >= 0);
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assert(packet);
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req = &packet->rheader;
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assert(length >= sizeof(RHeader));
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assert(length == req->length);
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switch (req->type) {
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case REQUEST_ADDRINFO: {
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const AddrInfoRequest *ai_req = &packet->addrinfo_request;
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struct addrinfo hints = {}, *result = NULL;
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const char *node, *service;
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int ret;
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assert(length >= sizeof(AddrInfoRequest));
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assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len);
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hints.ai_flags = ai_req->ai_flags;
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hints.ai_family = ai_req->ai_family;
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hints.ai_socktype = ai_req->ai_socktype;
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hints.ai_protocol = ai_req->ai_protocol;
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node = ai_req->node_len ? (const char*) ai_req + sizeof(AddrInfoRequest) : NULL;
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service = ai_req->service_len ? (const char*) ai_req + sizeof(AddrInfoRequest) + ai_req->node_len : NULL;
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ret = getaddrinfo(
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node, service,
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ai_req->hints_valid ? &hints : NULL,
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&result);
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/* send_addrinfo_reply() frees result */
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return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno);
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}
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case REQUEST_NAMEINFO: {
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const NameInfoRequest *ni_req = &packet->nameinfo_request;
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char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV];
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union sockaddr_union sa;
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int ret;
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assert(length >= sizeof(NameInfoRequest));
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assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len);
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assert(sizeof(sa) >= ni_req->sockaddr_len);
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memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len);
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ret = getnameinfo(&sa.sa, ni_req->sockaddr_len,
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ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0,
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ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0,
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ni_req->flags);
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return send_nameinfo_reply(out_fd, req->id, ret,
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ret == 0 && ni_req->gethost ? hostbuf : NULL,
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ret == 0 && ni_req->getserv ? servbuf : NULL,
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errno, h_errno);
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}
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case REQUEST_RES_QUERY:
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case REQUEST_RES_SEARCH: {
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const ResRequest *res_req = &packet->res_request;
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union {
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HEADER header;
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uint8_t space[BUFSIZE];
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} answer;
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const char *dname;
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int ret;
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assert(length >= sizeof(ResRequest));
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assert(length == sizeof(ResRequest) + res_req->dname_len);
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dname = (const char *) req + sizeof(ResRequest);
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if (req->type == REQUEST_RES_QUERY)
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ret = res_query(dname, res_req->class, res_req->type, (unsigned char *) &answer, BUFSIZE);
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else
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ret = res_search(dname, res_req->class, res_req->type, (unsigned char *) &answer, BUFSIZE);
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return send_res_reply(out_fd, req->id, (unsigned char *) &answer, ret, errno, h_errno);
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}
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case REQUEST_TERMINATE:
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/* Quit */
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return -ECONNRESET;
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default:
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assert_not_reached("Unknown request");
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}
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|
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return 0;
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}
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|
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static void* thread_worker(void *p) {
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sd_resolve *resolve = p;
|
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sigset_t fullset;
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|
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/* No signals in this thread please */
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assert_se(sigfillset(&fullset) == 0);
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assert_se(pthread_sigmask(SIG_BLOCK, &fullset, NULL) == 0);
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|
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/* Assign a pretty name to this thread */
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prctl(PR_SET_NAME, (unsigned long) "sd-resolve");
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|
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while (!resolve->dead) {
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union {
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Packet packet;
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uint8_t space[BUFSIZE];
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} buf;
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ssize_t length;
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|
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length = recv(resolve->fds[REQUEST_RECV_FD], &buf, sizeof(buf), 0);
|
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if (length < 0) {
|
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if (errno == EINTR)
|
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continue;
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|
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break;
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}
|
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if (length == 0)
|
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break;
|
|
|
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if (resolve->dead)
|
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break;
|
|
|
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if (handle_request(resolve->fds[RESPONSE_SEND_FD], &buf.packet, (size_t) length) < 0)
|
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break;
|
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}
|
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|
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send_died(resolve->fds[RESPONSE_SEND_FD]);
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|
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return NULL;
|
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}
|
|
|
|
static int start_threads(sd_resolve *resolve, unsigned extra) {
|
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unsigned n;
|
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int r;
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|
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n = resolve->n_queries - resolve->n_done + extra;
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|
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if (n < WORKERS_MIN)
|
|
n = WORKERS_MIN;
|
|
if (n > WORKERS_MAX)
|
|
n = WORKERS_MAX;
|
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|
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while (resolve->n_valid_workers < n) {
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|
|
r = pthread_create(&resolve->workers[resolve->n_valid_workers], NULL, thread_worker, resolve);
|
|
if (r != 0)
|
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return -r;
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|
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resolve->n_valid_workers ++;
|
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}
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|
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return 0;
|
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}
|
|
|
|
static bool resolve_pid_changed(sd_resolve *r) {
|
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assert(r);
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|
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/* We don't support people creating a resolver and keeping it
|
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* around after fork(). Let's complain. */
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|
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return r->original_pid != getpid();
|
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}
|
|
|
|
_public_ int sd_resolve_new(sd_resolve **ret) {
|
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sd_resolve *resolve = NULL;
|
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int i, r;
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|
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assert_return(ret, -EINVAL);
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|
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resolve = new0(sd_resolve, 1);
|
|
if (!resolve)
|
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return -ENOMEM;
|
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|
|
for (i = 0; i < _FD_MAX; i++)
|
|
resolve->fds[i] = -1;
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|
|
resolve->original_pid = getpid();
|
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|
|
r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + REQUEST_RECV_FD);
|
|
if (r < 0) {
|
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r = -errno;
|
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goto fail;
|
|
}
|
|
|
|
r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + RESPONSE_RECV_FD);
|
|
if (r < 0) {
|
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r = -errno;
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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:
|
|
if (resolve)
|
|
sd_resolve_unref(resolve);
|
|
|
|
return r;
|
|
}
|
|
|
|
_public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) {
|
|
PROTECT_ERRNO;
|
|
|
|
unsigned i;
|
|
|
|
assert_return(resolve, NULL);
|
|
assert_return(!resolve_pid_changed(resolve), NULL);
|
|
|
|
resolve->dead = true;
|
|
|
|
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++)
|
|
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++)
|
|
if (resolve->fds[i] >= 0)
|
|
close_nointr_nofail(resolve->fds[i]);
|
|
|
|
for (i = 0; i < QUERIES_MAX && resolve->n_queries > 0; i++)
|
|
if (resolve->queries[i])
|
|
sd_resolve_cancel(resolve->queries[i]);
|
|
|
|
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->queries[id % QUERIES_MAX];
|
|
if (q)
|
|
if (q->id == id)
|
|
return q;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void complete_query(sd_resolve_query *q) {
|
|
assert(q);
|
|
assert(!q->done);
|
|
|
|
q->done = true;
|
|
LIST_PREPEND(done, q->resolve->done, q);
|
|
q->resolve->n_done ++;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
complete_query(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 > 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;
|
|
}
|
|
}
|
|
|
|
complete_query(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) {
|
|
q->serv = memdup((const char *)resp + sizeof(ResResponse), res_resp->ret);
|
|
if (!q->serv) {
|
|
q->ret = -1;
|
|
q->_errno = ENOMEM;
|
|
q->_h_errno = 0;
|
|
}
|
|
}
|
|
|
|
complete_query(q);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_resolve_process(sd_resolve *resolve) {
|
|
int n_processed = 0, r;
|
|
|
|
assert_return(resolve, -EINVAL);
|
|
assert_return(!resolve_pid_changed(resolve), -ECHILD);
|
|
|
|
for (;;) {
|
|
ssize_t l;
|
|
union {
|
|
Packet packet;
|
|
uint8_t space[BUFSIZE];
|
|
} buf;
|
|
|
|
l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0);
|
|
if (l < 0) {
|
|
if (errno == EAGAIN)
|
|
return n_processed;
|
|
|
|
return -errno;
|
|
}
|
|
if (l == 0)
|
|
return -ECONNREFUSED;
|
|
|
|
r = handle_response(resolve, &buf.packet, (size_t) l);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
n_processed++;
|
|
}
|
|
}
|
|
|
|
_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_queries <= 0)
|
|
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, 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->queries[resolve->current_index]) {
|
|
resolve->current_index++;
|
|
resolve->current_id++;
|
|
|
|
resolve->current_index %= QUERIES_MAX;
|
|
}
|
|
|
|
q = resolve->queries[resolve->current_index] = new0(sd_resolve_query, 1);
|
|
if (!q)
|
|
return -ENOMEM;
|
|
|
|
resolve->n_queries++;
|
|
|
|
q->resolve = resolve;
|
|
q->id = resolve->current_id;
|
|
|
|
*_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) {
|
|
|
|
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(_q, -EINVAL);
|
|
assert_return(!resolve_pid_changed(resolve), -ECHILD);
|
|
|
|
r = alloc_query(resolve, &q);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
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 (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_cancel(q);
|
|
return -errno;
|
|
}
|
|
|
|
*_q = q;
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_resolve_getaddrinfo_done(sd_resolve_query* q, struct addrinfo **ret_res) {
|
|
int ret;
|
|
|
|
if (!q) {
|
|
errno = EINVAL;
|
|
return EAI_SYSTEM;
|
|
}
|
|
|
|
if (q->type != REQUEST_ADDRINFO) {
|
|
errno = ENOTTY;
|
|
return EAI_SYSTEM;
|
|
}
|
|
|
|
if (resolve_pid_changed(q->resolve)) {
|
|
errno = ECHILD;
|
|
return EAI_SYSTEM;
|
|
}
|
|
if (!q->done)
|
|
return EAI_AGAIN;
|
|
|
|
if (ret_res) {
|
|
*ret_res = q->addrinfo;
|
|
q->addrinfo = NULL;
|
|
}
|
|
|
|
ret = q->ret;
|
|
|
|
if (ret != 0) {
|
|
errno = q->_errno;
|
|
h_errno = q->_h_errno;
|
|
}
|
|
|
|
sd_resolve_cancel(q);
|
|
|
|
return ret;
|
|
}
|
|
|
|
_public_ int sd_resolve_getnameinfo(
|
|
sd_resolve *resolve,
|
|
sd_resolve_query**_q,
|
|
const struct sockaddr *sa, socklen_t salen,
|
|
int flags,
|
|
int gethost, int getserv) {
|
|
|
|
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(_q, -EINVAL);
|
|
assert_return(!resolve_pid_changed(resolve), -ECHILD);
|
|
|
|
r = alloc_query(resolve, &q);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
req.header.id = q->id;
|
|
req.header.type = q->type = REQUEST_NAMEINFO;
|
|
req.header.length = sizeof(NameInfoRequest) + salen;
|
|
|
|
req.flags = flags;
|
|
req.sockaddr_len = salen;
|
|
req.gethost = !!gethost;
|
|
req.getserv = !!getserv;
|
|
|
|
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_cancel(q);
|
|
return -errno;
|
|
}
|
|
|
|
*_q = q;
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_resolve_getnameinfo_done(sd_resolve_query* q, char **ret_host, char **ret_serv) {
|
|
int ret;
|
|
|
|
if (!q) {
|
|
errno = EINVAL;
|
|
return EAI_SYSTEM;
|
|
}
|
|
|
|
if (q->type != REQUEST_NAMEINFO) {
|
|
errno = ENOTTY;
|
|
return EAI_SYSTEM;
|
|
}
|
|
|
|
if (resolve_pid_changed(q->resolve)) {
|
|
errno = ECHILD;
|
|
return EAI_SYSTEM;
|
|
}
|
|
|
|
if (!q->done)
|
|
return EAI_AGAIN;
|
|
|
|
if (ret_host) {
|
|
*ret_host = q->host;
|
|
q->host = NULL;
|
|
}
|
|
|
|
if (ret_serv) {
|
|
*ret_serv = q->serv;
|
|
q->serv = NULL;
|
|
}
|
|
|
|
ret = q->ret;
|
|
|
|
if (ret != 0) {
|
|
errno = q->_errno;
|
|
h_errno = q->_h_errno;
|
|
}
|
|
|
|
sd_resolve_cancel(q);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int resolve_res(
|
|
sd_resolve *resolve,
|
|
sd_resolve_query **_q,
|
|
QueryType qtype,
|
|
const char *dname,
|
|
int class, int type) {
|
|
|
|
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(_q, -EINVAL);
|
|
assert_return(!resolve_pid_changed(resolve), -ECHILD);
|
|
|
|
r = alloc_query(resolve, &q);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
req.dname_len = strlen(dname) + 1;
|
|
req.class = class;
|
|
req.type = type;
|
|
|
|
req.header.id = q->id;
|
|
req.header.type = q->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_cancel(q);
|
|
return -errno;
|
|
}
|
|
|
|
*_q = q;
|
|
return 0;
|
|
}
|
|
|
|
_public_ int sd_resolve_res_query(sd_resolve *resolve, sd_resolve_query** q, const char *dname, int class, int type) {
|
|
return resolve_res(resolve, q, REQUEST_RES_QUERY, dname, class, type);
|
|
}
|
|
|
|
_public_ int sd_resolve_res_search(sd_resolve *resolve, sd_resolve_query** q, const char *dname, int class, int type) {
|
|
return resolve_res(resolve, q, REQUEST_RES_SEARCH, dname, class, type);
|
|
}
|
|
|
|
_public_ int sd_resolve_res_done(sd_resolve_query* q, unsigned char **answer) {
|
|
int ret;
|
|
|
|
assert_return(q, -EINVAL);
|
|
assert_return(answer, -EINVAL);
|
|
assert_return(q->type == REQUEST_RES_QUERY || q->type == REQUEST_RES_SEARCH, -ENOTTY);
|
|
assert_return(!resolve_pid_changed(q->resolve), -ECHILD);
|
|
|
|
if (!q->done)
|
|
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(q);
|
|
|
|
return ret < 0 ? -errno : ret;
|
|
}
|
|
|
|
_public_ int sd_resolve_get_next(sd_resolve *resolve, sd_resolve_query **q) {
|
|
assert_return(resolve, -EINVAL);
|
|
assert_return(q, -EINVAL);
|
|
assert_return(!resolve_pid_changed(resolve), -ECHILD);
|
|
|
|
*q = resolve->done;
|
|
return !!resolve->done;
|
|
}
|
|
|
|
_public_ int sd_resolve_get_n_queries(sd_resolve *resolve) {
|
|
assert_return(resolve, -EINVAL);
|
|
assert_return(!resolve_pid_changed(resolve), -ECHILD);
|
|
|
|
return resolve->n_queries;
|
|
}
|
|
|
|
_public_ int sd_resolve_cancel(sd_resolve_query* q) {
|
|
PROTECT_ERRNO;
|
|
int i;
|
|
|
|
if (!q)
|
|
return 0;
|
|
|
|
assert_return(!resolve_pid_changed(q->resolve), -ECHILD);
|
|
|
|
assert(q->resolve);
|
|
assert(q->resolve->n_queries > 0);
|
|
|
|
if (q->done) {
|
|
LIST_REMOVE(done, q->resolve->done, q);
|
|
q->resolve->n_done--;
|
|
}
|
|
|
|
i = q->id % QUERIES_MAX;
|
|
assert(q->resolve->queries[i] == q);
|
|
q->resolve->queries[i] = NULL;
|
|
q->resolve->n_queries--;
|
|
|
|
sd_resolve_freeaddrinfo(q->addrinfo);
|
|
free(q->host);
|
|
free(q->serv);
|
|
free(q);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_public_ void sd_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;
|
|
}
|
|
}
|
|
|
|
_public_ int sd_resolve_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_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_get_userdata(sd_resolve_query *q) {
|
|
assert_return(q, NULL);
|
|
assert_return(!resolve_pid_changed(q->resolve), NULL);
|
|
|
|
return q->userdata;
|
|
}
|