masqmail

annotate src/listen.c @ 411:9b93c0a3bd8c

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Ensure lvals, rvals and components of address strucs are stripped.
author markus schnalke <meillo@marmaro.de>
date Wed, 29 Feb 2012 12:06:33 +0100
parents a2909de1818b
children 180a7f6a9383
rev   line source
meillo@367 1 /*
meillo@367 2 ** MasqMail
meillo@367 3 ** Copyright (C) 1999/2000 Oliver Kurth
meillo@367 4 **
meillo@367 5 ** This program is free software; you can redistribute it and/or modify
meillo@367 6 ** it under the terms of the GNU General Public License as published by
meillo@367 7 ** the Free Software Foundation; either version 2 of the License, or
meillo@367 8 ** (at your option) any later version.
meillo@367 9 **
meillo@367 10 ** This program is distributed in the hope that it will be useful,
meillo@367 11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@367 12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@367 13 ** GNU General Public License for more details.
meillo@367 14 **
meillo@367 15 ** You should have received a copy of the GNU General Public License
meillo@367 16 ** along with this program; if not, write to the Free Software
meillo@367 17 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 18 */
meillo@0 19
meillo@0 20 #include <sys/wait.h>
meillo@0 21 #include <sys/types.h>
meillo@0 22
meillo@15 23 #include "masqmail.h"
meillo@15 24
meillo@0 25 static int volatile sighup_seen = 0;
meillo@0 26
meillo@10 27 static void
meillo@10 28 sighup_handler(int sig)
meillo@0 29 {
meillo@10 30 sighup_seen = 1;
meillo@10 31 signal(SIGHUP, sighup_handler);
meillo@0 32 }
meillo@0 33
meillo@10 34 static void
meillo@10 35 sigchld_handler(int sig)
meillo@0 36 {
meillo@10 37 pid_t pid;
meillo@10 38 int status;
meillo@10 39
meillo@10 40 pid = waitpid(0, &status, 0);
meillo@10 41 if (pid > 0) {
meillo@384 42 if (WEXITSTATUS(status) != 0) {
meillo@384 43 logwrite(LOG_WARNING, "process %d exited with %d\n",
meillo@384 44 pid, WEXITSTATUS(status));
meillo@384 45 }
meillo@384 46 if (WIFSIGNALED(status)) {
meillo@384 47 logwrite(LOG_WARNING, "process %d got signal: %d\n",
meillo@384 48 pid, WTERMSIG(status));
meillo@384 49 }
meillo@10 50 }
meillo@10 51 signal(SIGCHLD, sigchld_handler);
meillo@0 52 }
meillo@0 53
meillo@10 54 void
meillo@10 55 accept_connect(int listen_sock, int sock, struct sockaddr_in *sock_addr)
meillo@0 56 {
meillo@10 57 pid_t pid;
meillo@10 58 int dup_sock = dup(sock);
meillo@10 59 FILE *out, *in;
meillo@10 60 gchar *rem_host;
meillo@10 61 gchar *ident = NULL;
meillo@0 62
meillo@10 63 rem_host = g_strdup(inet_ntoa(sock_addr->sin_addr));
meillo@383 64 logwrite(LOG_NOTICE, "connect from host %s, port %hu\n",
meillo@383 65 rem_host, ntohs(sock_addr->sin_port));
meillo@0 66
meillo@207 67 /* start child for connection: */
meillo@10 68 signal(SIGCHLD, sigchld_handler);
meillo@10 69 pid = fork();
meillo@384 70 if (pid < 0) {
meillo@384 71 logwrite(LOG_WARNING, "could not fork for incoming smtp "
meillo@384 72 "connection: %s\n", strerror(errno));
meillo@384 73 } else if (pid == 0) {
meillo@384 74 /* child */
meillo@10 75 close(listen_sock);
meillo@10 76 out = fdopen(sock, "w");
meillo@10 77 in = fdopen(dup_sock, "r");
meillo@10 78 smtp_in(in, out, rem_host, ident);
meillo@262 79 _exit(0);
meillo@10 80 }
meillo@0 81
meillo@10 82 close(sock);
meillo@10 83 close(dup_sock);
meillo@0 84 }
meillo@0 85
meillo@10 86 void
meillo@366 87 listen_port(GList *iface_list, gint qival, char *argv[])
meillo@0 88 {
meillo@10 89 int i;
meillo@10 90 fd_set active_fd_set, read_fd_set;
meillo@10 91 struct timeval tm;
meillo@10 92 time_t time_before, time_now;
meillo@10 93 struct sockaddr_in clientname;
meillo@10 94 size_t size;
meillo@10 95 GList *node, *node_next;
meillo@10 96 int sel_ret;
meillo@0 97
meillo@10 98 /* Create the sockets and set them up to accept connections. */
meillo@10 99 FD_ZERO(&active_fd_set);
meillo@10 100 for (node = g_list_first(iface_list); node; node = node_next) {
meillo@10 101 interface *iface = (interface *) (node->data);
meillo@10 102 int sock;
meillo@0 103
meillo@10 104 node_next = g_list_next(node);
meillo@10 105 if ((sock = make_server_socket(iface)) < 0) {
meillo@10 106 iface_list = g_list_remove_link(iface_list, node);
meillo@10 107 g_list_free_1(node);
meillo@10 108 continue;
meillo@10 109 }
meillo@10 110 if (listen(sock, 1) < 0) {
meillo@384 111 logwrite(LOG_ALERT, "listen: (terminating): %s\n",
meillo@384 112 strerror(errno));
meillo@262 113 exit(1);
meillo@10 114 }
meillo@384 115 logwrite(LOG_NOTICE, "listening on interface %s:%d\n",
meillo@384 116 iface->address, iface->port);
meillo@10 117 DEBUG(5) debugf("sock = %d\n", sock);
meillo@10 118 FD_SET(sock, &active_fd_set);
meillo@10 119 }
meillo@0 120
meillo@10 121 /* setup handler for HUP signal: */
meillo@10 122 signal(SIGHUP, sighup_handler);
meillo@10 123 signal(SIGCHLD, sigchld_handler);
meillo@0 124
meillo@15 125 /* now that we have our socket(s), we can give up root privileges */
meillo@10 126 if (!conf.run_as_user) {
meillo@332 127 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
meillo@10 128 }
meillo@0 129
meillo@10 130 /* sel_ret = 0; */
meillo@10 131 time(&time_before);
meillo@10 132 time_before -= qival;
meillo@10 133 sel_ret = -1;
meillo@0 134
meillo@10 135 while (1) {
meillo@0 136
meillo@367 137 /*
meillo@367 138 ** if we were interrupted by an incoming connection (or a
meillo@367 139 ** signal) we have to recalculate the time until the next
meillo@367 140 ** queue run should occur. select may put a value into tm,
meillo@367 141 ** but doc for select() says we should not use it.
meillo@367 142 */
meillo@10 143 if (qival > 0) {
meillo@10 144 time(&time_now);
meillo@384 145 if (!sel_ret) {
meillo@384 146 /* either just starting or after a queue run */
meillo@10 147 tm.tv_sec = qival;
meillo@10 148 tm.tv_usec = 0;
meillo@10 149 time_before = time_now;
meillo@10 150 } else {
meillo@10 151 tm.tv_sec = qival - (time_now - time_before);
meillo@10 152 tm.tv_usec = 0;
meillo@0 153
meillo@384 154 /* race condition, unlikely (but possible): */
meillo@384 155 if (tm.tv_sec < 0) {
meillo@10 156 tm.tv_sec = 0;
meillo@384 157 }
meillo@10 158 }
meillo@10 159 }
meillo@367 160 /*
meillo@367 161 ** Block until input arrives on one or more active sockets,
meillo@367 162 ** or signal arrives, or queuing interval time elapsed
meillo@367 163 ** (if qival > 0)
meillo@367 164 */
meillo@10 165 read_fd_set = active_fd_set;
meillo@384 166 if ((sel_ret = select(FD_SETSIZE, &read_fd_set, NULL, NULL,
meillo@384 167 qival > 0 ? &tm : NULL)) < 0) {
meillo@10 168 if (errno != EINTR) {
meillo@384 169 logwrite(LOG_ALERT, "select: (terminating): "
meillo@384 170 "%s\n", strerror(errno));
meillo@262 171 exit(1);
meillo@384 172 } else if (sighup_seen) {
meillo@384 173 logwrite(LOG_NOTICE, "HUP signal received. "
meillo@384 174 "Restarting daemon\n");
meillo@0 175
meillo@384 176 for (i = 0; i < FD_SETSIZE; i++)
meillo@384 177 if (FD_ISSET(i, &active_fd_set))
meillo@384 178 close(i);
meillo@0 179
meillo@384 180 execv(argv[0], &(argv[0]));
meillo@384 181 logwrite(LOG_ALERT, "restarting failed: %s\n",
meillo@384 182 strerror(errno));
meillo@384 183 exit(1);
meillo@10 184 }
meillo@10 185 } else if (sel_ret > 0) {
meillo@10 186 for (i = 0; i < FD_SETSIZE; i++) {
meillo@384 187 int sock = i;
meillo@384 188 int new;
meillo@384 189
meillo@384 190 if (!FD_ISSET(i, &read_fd_set)) {
meillo@384 191 continue;
meillo@384 192 }
meillo@384 193 size = sizeof(clientname);
meillo@384 194 new = accept(sock, (struct sockaddr *)
meillo@384 195 &clientname, &size);
meillo@384 196 if (new < 0) {
meillo@384 197 logwrite(LOG_ALERT, "accept: (ignoring): %s\n", strerror(errno));
meillo@384 198 } else {
meillo@384 199 accept_connect(sock, new,
meillo@384 200 &clientname);
meillo@10 201 }
meillo@10 202 }
meillo@10 203 } else {
meillo@367 204 /*
meillo@367 205 ** If select returns 0, the interval time has elapsed.
meillo@367 206 ** We start a new queue runner process
meillo@367 207 */
meillo@10 208 int pid;
meillo@10 209 signal(SIGCHLD, sigchld_handler);
meillo@10 210 if ((pid = fork()) == 0) {
meillo@10 211 queue_run();
meillo@10 212
meillo@262 213 _exit(0);
meillo@10 214 } else if (pid < 0) {
meillo@384 215 logwrite(LOG_ALERT, "could not fork for "
meillo@384 216 "queue run");
meillo@10 217 }
meillo@10 218 }
meillo@0 219 }
meillo@0 220 }