masqmail

annotate src/listen.c @ 383:a2909de1818b

find changesets by author, revision, files, or words in the commit message
Port number are unsigned. This corrects the logfile output.
author markus schnalke <meillo@marmaro.de>
date Thu, 16 Feb 2012 11:12:39 +0100
parents 5781ba87df95
children 4848c16ed1c1
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@383 60 logwrite(LOG_NOTICE, "connect from host %s, port %hu\n",
meillo@383 61 rem_host, ntohs(sock_addr->sin_port));
meillo@0 62
meillo@207 63 /* start child for connection: */
meillo@10 64 signal(SIGCHLD, sigchld_handler);
meillo@10 65 pid = fork();
meillo@10 66 if (pid == 0) {
meillo@10 67 close(listen_sock);
meillo@10 68 out = fdopen(sock, "w");
meillo@10 69 in = fdopen(dup_sock, "r");
meillo@0 70
meillo@10 71 smtp_in(in, out, rem_host, ident);
meillo@0 72
meillo@262 73 _exit(0);
meillo@10 74 } else if (pid < 0) {
meillo@10 75 logwrite(LOG_WARNING, "could not fork for incoming smtp connection: %s\n", strerror(errno));
meillo@10 76 }
meillo@0 77
meillo@10 78 close(sock);
meillo@10 79 close(dup_sock);
meillo@0 80 }
meillo@0 81
meillo@10 82 void
meillo@366 83 listen_port(GList *iface_list, gint qival, char *argv[])
meillo@0 84 {
meillo@10 85 int i;
meillo@10 86 fd_set active_fd_set, read_fd_set;
meillo@10 87 struct timeval tm;
meillo@10 88 time_t time_before, time_now;
meillo@10 89 struct sockaddr_in clientname;
meillo@10 90 size_t size;
meillo@10 91 GList *node, *node_next;
meillo@10 92 int sel_ret;
meillo@0 93
meillo@10 94 /* Create the sockets and set them up to accept connections. */
meillo@10 95 FD_ZERO(&active_fd_set);
meillo@10 96 for (node = g_list_first(iface_list); node; node = node_next) {
meillo@10 97 interface *iface = (interface *) (node->data);
meillo@10 98 int sock;
meillo@0 99
meillo@10 100 node_next = g_list_next(node);
meillo@10 101 if ((sock = make_server_socket(iface)) < 0) {
meillo@10 102 iface_list = g_list_remove_link(iface_list, node);
meillo@10 103 g_list_free_1(node);
meillo@10 104 continue;
meillo@10 105 }
meillo@10 106 if (listen(sock, 1) < 0) {
meillo@10 107 logwrite(LOG_ALERT, "listen: (terminating): %s\n", strerror(errno));
meillo@262 108 exit(1);
meillo@10 109 }
meillo@10 110 logwrite(LOG_NOTICE, "listening on interface %s:%d\n", iface->address, iface->port);
meillo@10 111 DEBUG(5) debugf("sock = %d\n", sock);
meillo@10 112 FD_SET(sock, &active_fd_set);
meillo@10 113 }
meillo@0 114
meillo@10 115 /* setup handler for HUP signal: */
meillo@10 116 signal(SIGHUP, sighup_handler);
meillo@10 117 signal(SIGCHLD, sigchld_handler);
meillo@0 118
meillo@15 119 /* now that we have our socket(s), we can give up root privileges */
meillo@10 120 if (!conf.run_as_user) {
meillo@332 121 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
meillo@10 122 }
meillo@0 123
meillo@10 124 /* sel_ret = 0; */
meillo@10 125 time(&time_before);
meillo@10 126 time_before -= qival;
meillo@10 127 sel_ret = -1;
meillo@0 128
meillo@10 129 while (1) {
meillo@0 130
meillo@367 131 /*
meillo@367 132 ** if we were interrupted by an incoming connection (or a
meillo@367 133 ** signal) we have to recalculate the time until the next
meillo@367 134 ** queue run should occur. select may put a value into tm,
meillo@367 135 ** but doc for select() says we should not use it.
meillo@367 136 */
meillo@10 137 if (qival > 0) {
meillo@10 138 time(&time_now);
meillo@10 139 if (sel_ret == 0) { /* we are either just starting or did a queue run */
meillo@10 140 tm.tv_sec = qival;
meillo@10 141 tm.tv_usec = 0;
meillo@10 142 time_before = time_now;
meillo@10 143 } else {
meillo@10 144 tm.tv_sec = qival - (time_now - time_before);
meillo@10 145 tm.tv_usec = 0;
meillo@0 146
meillo@10 147 /* race condition, very unlikely (but possible): */
meillo@10 148 if (tm.tv_sec < 0)
meillo@10 149 tm.tv_sec = 0;
meillo@10 150 }
meillo@10 151 }
meillo@367 152 /*
meillo@367 153 ** Block until input arrives on one or more active sockets,
meillo@367 154 ** or signal arrives, or queuing interval time elapsed
meillo@367 155 ** (if qival > 0)
meillo@367 156 */
meillo@10 157 read_fd_set = active_fd_set;
meillo@10 158 if ((sel_ret = select(FD_SETSIZE, &read_fd_set, NULL, NULL, qival > 0 ? &tm : NULL)) < 0) {
meillo@10 159 if (errno != EINTR) {
meillo@10 160 logwrite(LOG_ALERT, "select: (terminating): %s\n", strerror(errno));
meillo@262 161 exit(1);
meillo@10 162 } else {
meillo@10 163 if (sighup_seen) {
meillo@10 164 logwrite(LOG_NOTICE, "HUP signal received. Restarting daemon\n");
meillo@0 165
meillo@10 166 for (i = 0; i < FD_SETSIZE; i++)
meillo@10 167 if (FD_ISSET(i, &active_fd_set))
meillo@10 168 close(i);
meillo@0 169
meillo@10 170 execv(argv[0], &(argv[0]));
meillo@10 171 logwrite(LOG_ALERT, "restarting failed: %s\n", strerror(errno));
meillo@262 172 exit(1);
meillo@10 173 }
meillo@10 174 }
meillo@10 175 } else if (sel_ret > 0) {
meillo@10 176 for (i = 0; i < FD_SETSIZE; i++) {
meillo@10 177 if (FD_ISSET(i, &read_fd_set)) {
meillo@10 178 int sock = i;
meillo@10 179 int new;
meillo@10 180 size = sizeof(clientname);
meillo@10 181 new = accept(sock, (struct sockaddr *) &clientname, &size);
meillo@10 182 if (new < 0) {
meillo@10 183 logwrite(LOG_ALERT, "accept: (ignoring): %s\n", strerror(errno));
meillo@10 184 } else
meillo@10 185 accept_connect(sock, new, &clientname);
meillo@10 186 }
meillo@10 187 }
meillo@10 188 } else {
meillo@367 189 /*
meillo@367 190 ** If select returns 0, the interval time has elapsed.
meillo@367 191 ** We start a new queue runner process
meillo@367 192 */
meillo@10 193 int pid;
meillo@10 194 signal(SIGCHLD, sigchld_handler);
meillo@10 195 if ((pid = fork()) == 0) {
meillo@10 196 queue_run();
meillo@10 197
meillo@262 198 _exit(0);
meillo@10 199 } else if (pid < 0) {
meillo@10 200 logwrite(LOG_ALERT, "could not fork for queue run");
meillo@10 201 }
meillo@10 202 }
meillo@0 203 }
meillo@0 204 }