masqmail

annotate src/listen.c @ 381:33b893124c81

find changesets by author, revision, files, or words in the commit message
Added tag 0.3.4 for changeset 35c5239ebcc1
author markus schnalke <meillo@marmaro.de>
date Wed, 18 Jan 2012 09:52:40 +0100
parents b27f66555ba8
children a2909de1818b
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@262 42 if (WEXITSTATUS(status) != 0)
meillo@10 43 logwrite(LOG_WARNING, "process %d exited with %d\n", pid, WEXITSTATUS(status));
meillo@10 44 if (WIFSIGNALED(status))
meillo@10 45 logwrite(LOG_WARNING, "process with pid %d got signal: %d\n", pid, WTERMSIG(status));
meillo@10 46 }
meillo@10 47 signal(SIGCHLD, sigchld_handler);
meillo@0 48 }
meillo@0 49
meillo@10 50 void
meillo@10 51 accept_connect(int listen_sock, int sock, struct sockaddr_in *sock_addr)
meillo@0 52 {
meillo@10 53 pid_t pid;
meillo@10 54 int dup_sock = dup(sock);
meillo@10 55 FILE *out, *in;
meillo@10 56 gchar *rem_host;
meillo@10 57 gchar *ident = NULL;
meillo@0 58
meillo@10 59 rem_host = g_strdup(inet_ntoa(sock_addr->sin_addr));
meillo@10 60 logwrite(LOG_NOTICE, "connect from host %s, port %hd\n", rem_host, ntohs(sock_addr->sin_port));
meillo@0 61
meillo@207 62 /* start child for connection: */
meillo@10 63 signal(SIGCHLD, sigchld_handler);
meillo@10 64 pid = fork();
meillo@10 65 if (pid == 0) {
meillo@10 66 close(listen_sock);
meillo@10 67 out = fdopen(sock, "w");
meillo@10 68 in = fdopen(dup_sock, "r");
meillo@0 69
meillo@10 70 smtp_in(in, out, rem_host, ident);
meillo@0 71
meillo@262 72 _exit(0);
meillo@10 73 } else if (pid < 0) {
meillo@10 74 logwrite(LOG_WARNING, "could not fork for incoming smtp connection: %s\n", strerror(errno));
meillo@10 75 }
meillo@0 76
meillo@10 77 close(sock);
meillo@10 78 close(dup_sock);
meillo@0 79 }
meillo@0 80
meillo@10 81 void
meillo@366 82 listen_port(GList *iface_list, gint qival, char *argv[])
meillo@0 83 {
meillo@10 84 int i;
meillo@10 85 fd_set active_fd_set, read_fd_set;
meillo@10 86 struct timeval tm;
meillo@10 87 time_t time_before, time_now;
meillo@10 88 struct sockaddr_in clientname;
meillo@10 89 size_t size;
meillo@10 90 GList *node, *node_next;
meillo@10 91 int sel_ret;
meillo@0 92
meillo@10 93 /* Create the sockets and set them up to accept connections. */
meillo@10 94 FD_ZERO(&active_fd_set);
meillo@10 95 for (node = g_list_first(iface_list); node; node = node_next) {
meillo@10 96 interface *iface = (interface *) (node->data);
meillo@10 97 int sock;
meillo@0 98
meillo@10 99 node_next = g_list_next(node);
meillo@10 100 if ((sock = make_server_socket(iface)) < 0) {
meillo@10 101 iface_list = g_list_remove_link(iface_list, node);
meillo@10 102 g_list_free_1(node);
meillo@10 103 continue;
meillo@10 104 }
meillo@10 105 if (listen(sock, 1) < 0) {
meillo@10 106 logwrite(LOG_ALERT, "listen: (terminating): %s\n", strerror(errno));
meillo@262 107 exit(1);
meillo@10 108 }
meillo@10 109 logwrite(LOG_NOTICE, "listening on interface %s:%d\n", iface->address, iface->port);
meillo@10 110 DEBUG(5) debugf("sock = %d\n", sock);
meillo@10 111 FD_SET(sock, &active_fd_set);
meillo@10 112 }
meillo@0 113
meillo@10 114 /* setup handler for HUP signal: */
meillo@10 115 signal(SIGHUP, sighup_handler);
meillo@10 116 signal(SIGCHLD, sigchld_handler);
meillo@0 117
meillo@15 118 /* now that we have our socket(s), we can give up root privileges */
meillo@10 119 if (!conf.run_as_user) {
meillo@332 120 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
meillo@10 121 }
meillo@0 122
meillo@10 123 /* sel_ret = 0; */
meillo@10 124 time(&time_before);
meillo@10 125 time_before -= qival;
meillo@10 126 sel_ret = -1;
meillo@0 127
meillo@10 128 while (1) {
meillo@0 129
meillo@367 130 /*
meillo@367 131 ** if we were interrupted by an incoming connection (or a
meillo@367 132 ** signal) we have to recalculate the time until the next
meillo@367 133 ** queue run should occur. select may put a value into tm,
meillo@367 134 ** but doc for select() says we should not use it.
meillo@367 135 */
meillo@10 136 if (qival > 0) {
meillo@10 137 time(&time_now);
meillo@10 138 if (sel_ret == 0) { /* we are either just starting or did a queue run */
meillo@10 139 tm.tv_sec = qival;
meillo@10 140 tm.tv_usec = 0;
meillo@10 141 time_before = time_now;
meillo@10 142 } else {
meillo@10 143 tm.tv_sec = qival - (time_now - time_before);
meillo@10 144 tm.tv_usec = 0;
meillo@0 145
meillo@10 146 /* race condition, very unlikely (but possible): */
meillo@10 147 if (tm.tv_sec < 0)
meillo@10 148 tm.tv_sec = 0;
meillo@10 149 }
meillo@10 150 }
meillo@367 151 /*
meillo@367 152 ** Block until input arrives on one or more active sockets,
meillo@367 153 ** or signal arrives, or queuing interval time elapsed
meillo@367 154 ** (if qival > 0)
meillo@367 155 */
meillo@10 156 read_fd_set = active_fd_set;
meillo@10 157 if ((sel_ret = select(FD_SETSIZE, &read_fd_set, NULL, NULL, qival > 0 ? &tm : NULL)) < 0) {
meillo@10 158 if (errno != EINTR) {
meillo@10 159 logwrite(LOG_ALERT, "select: (terminating): %s\n", strerror(errno));
meillo@262 160 exit(1);
meillo@10 161 } else {
meillo@10 162 if (sighup_seen) {
meillo@10 163 logwrite(LOG_NOTICE, "HUP signal received. Restarting daemon\n");
meillo@0 164
meillo@10 165 for (i = 0; i < FD_SETSIZE; i++)
meillo@10 166 if (FD_ISSET(i, &active_fd_set))
meillo@10 167 close(i);
meillo@0 168
meillo@10 169 execv(argv[0], &(argv[0]));
meillo@10 170 logwrite(LOG_ALERT, "restarting failed: %s\n", strerror(errno));
meillo@262 171 exit(1);
meillo@10 172 }
meillo@10 173 }
meillo@10 174 } else if (sel_ret > 0) {
meillo@10 175 for (i = 0; i < FD_SETSIZE; i++) {
meillo@10 176 if (FD_ISSET(i, &read_fd_set)) {
meillo@10 177 int sock = i;
meillo@10 178 int new;
meillo@10 179 size = sizeof(clientname);
meillo@10 180 new = accept(sock, (struct sockaddr *) &clientname, &size);
meillo@10 181 if (new < 0) {
meillo@10 182 logwrite(LOG_ALERT, "accept: (ignoring): %s\n", strerror(errno));
meillo@10 183 } else
meillo@10 184 accept_connect(sock, new, &clientname);
meillo@10 185 }
meillo@10 186 }
meillo@10 187 } else {
meillo@367 188 /*
meillo@367 189 ** If select returns 0, the interval time has elapsed.
meillo@367 190 ** We start a new queue runner process
meillo@367 191 */
meillo@10 192 int pid;
meillo@10 193 signal(SIGCHLD, sigchld_handler);
meillo@10 194 if ((pid = fork()) == 0) {
meillo@10 195 queue_run();
meillo@10 196
meillo@262 197 _exit(0);
meillo@10 198 } else if (pid < 0) {
meillo@10 199 logwrite(LOG_ALERT, "could not fork for queue run");
meillo@10 200 }
meillo@10 201 }
meillo@0 202 }
meillo@0 203 }