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annotate src/listen.c @ 381:33b893124c81

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Added tag 0.3.4 for changeset 35c5239ebcc1
author markus schnalke <meillo@marmaro.de>
date Wed, 18 Jan 2012 09:52:40 +0100
parents 5781ba87df95
children a2909de1818b
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367
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1 /*
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2 ** MasqMail
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3 ** Copyright (C) 1999/2000 Oliver Kurth
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4 **
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5 ** This program is free software; you can redistribute it and/or modify
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6 ** it under the terms of the GNU General Public License as published by
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7 ** the Free Software Foundation; either version 2 of the License, or
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8 ** (at your option) any later version.
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9 **
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10 ** This program is distributed in the hope that it will be useful,
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11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ** GNU General Public License for more details.
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14 **
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15 ** You should have received a copy of the GNU General Public License
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16 ** along with this program; if not, write to the Free Software
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17 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
0
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18 */
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19
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20 #include <sys/wait.h>
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21 #include <sys/types.h>
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22
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23 #include "masqmail.h"
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24
0
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25 static int volatile sighup_seen = 0;
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26
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27 static void
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28 sighup_handler(int sig)
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29 {
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30 sighup_seen = 1;
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31 signal(SIGHUP, sighup_handler);
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32 }
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34 static void
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35 sigchld_handler(int sig)
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36 {
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37 pid_t pid;
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38 int status;
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39
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40 pid = waitpid(0, &status, 0);
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41 if (pid > 0) {
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42 if (WEXITSTATUS(status) != 0)
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43 logwrite(LOG_WARNING, "process %d exited with %d\n", pid, WEXITSTATUS(status));
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44 if (WIFSIGNALED(status))
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45 logwrite(LOG_WARNING, "process with pid %d got signal: %d\n", pid, WTERMSIG(status));
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46 }
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47 signal(SIGCHLD, sigchld_handler);
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48 }
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49
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50 void
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51 accept_connect(int listen_sock, int sock, struct sockaddr_in *sock_addr)
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52 {
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53 pid_t pid;
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54 int dup_sock = dup(sock);
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55 FILE *out, *in;
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56 gchar *rem_host;
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57 gchar *ident = NULL;
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58
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59 rem_host = g_strdup(inet_ntoa(sock_addr->sin_addr));
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60 logwrite(LOG_NOTICE, "connect from host %s, port %hd\n", rem_host, ntohs(sock_addr->sin_port));
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61
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62 /* start child for connection: */
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63 signal(SIGCHLD, sigchld_handler);
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64 pid = fork();
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65 if (pid == 0) {
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66 close(listen_sock);
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67 out = fdopen(sock, "w");
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68 in = fdopen(dup_sock, "r");
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69
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70 smtp_in(in, out, rem_host, ident);
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71
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72 _exit(0);
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73 } else if (pid < 0) {
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74 logwrite(LOG_WARNING, "could not fork for incoming smtp connection: %s\n", strerror(errno));
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75 }
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76
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77 close(sock);
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78 close(dup_sock);
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79 }
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81 void
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82 listen_port(GList *iface_list, gint qival, char *argv[])
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83 {
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84 int i;
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85 fd_set active_fd_set, read_fd_set;
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86 struct timeval tm;
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87 time_t time_before, time_now;
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88 struct sockaddr_in clientname;
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89 size_t size;
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90 GList *node, *node_next;
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91 int sel_ret;
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92
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93 /* Create the sockets and set them up to accept connections. */
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94 FD_ZERO(&active_fd_set);
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95 for (node = g_list_first(iface_list); node; node = node_next) {
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96 interface *iface = (interface *) (node->data);
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97 int sock;
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98
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99 node_next = g_list_next(node);
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100 if ((sock = make_server_socket(iface)) < 0) {
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101 iface_list = g_list_remove_link(iface_list, node);
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102 g_list_free_1(node);
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103 continue;
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104 }
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105 if (listen(sock, 1) < 0) {
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106 logwrite(LOG_ALERT, "listen: (terminating): %s\n", strerror(errno));
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107 exit(1);
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108 }
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109 logwrite(LOG_NOTICE, "listening on interface %s:%d\n", iface->address, iface->port);
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110 DEBUG(5) debugf("sock = %d\n", sock);
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111 FD_SET(sock, &active_fd_set);
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112 }
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113
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114 /* setup handler for HUP signal: */
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115 signal(SIGHUP, sighup_handler);
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116 signal(SIGCHLD, sigchld_handler);
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117
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118 /* now that we have our socket(s), we can give up root privileges */
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119 if (!conf.run_as_user) {
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120 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
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121 }
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122
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123 /* sel_ret = 0; */
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124 time(&time_before);
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125 time_before -= qival;
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126 sel_ret = -1;
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127
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128 while (1) {
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129
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130 /*
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131 ** if we were interrupted by an incoming connection (or a
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132 ** signal) we have to recalculate the time until the next
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133 ** queue run should occur. select may put a value into tm,
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134 ** but doc for select() says we should not use it.
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135 */
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136 if (qival > 0) {
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137 time(&time_now);
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138 if (sel_ret == 0) { /* we are either just starting or did a queue run */
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139 tm.tv_sec = qival;
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140 tm.tv_usec = 0;
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141 time_before = time_now;
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142 } else {
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143 tm.tv_sec = qival - (time_now - time_before);
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144 tm.tv_usec = 0;
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145
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146 /* race condition, very unlikely (but possible): */
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147 if (tm.tv_sec < 0)
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148 tm.tv_sec = 0;
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149 }
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150 }
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151 /*
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152 ** Block until input arrives on one or more active sockets,
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153 ** or signal arrives, or queuing interval time elapsed
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154 ** (if qival > 0)
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155 */
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156 read_fd_set = active_fd_set;
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157 if ((sel_ret = select(FD_SETSIZE, &read_fd_set, NULL, NULL, qival > 0 ? &tm : NULL)) < 0) {
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158 if (errno != EINTR) {
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159 logwrite(LOG_ALERT, "select: (terminating): %s\n", strerror(errno));
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160 exit(1);
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161 } else {
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162 if (sighup_seen) {
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163 logwrite(LOG_NOTICE, "HUP signal received. Restarting daemon\n");
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164
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165 for (i = 0; i < FD_SETSIZE; i++)
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166 if (FD_ISSET(i, &active_fd_set))
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167 close(i);
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168
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169 execv(argv[0], &(argv[0]));
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170 logwrite(LOG_ALERT, "restarting failed: %s\n", strerror(errno));
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171 exit(1);
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172 }
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173 }
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174 } else if (sel_ret > 0) {
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175 for (i = 0; i < FD_SETSIZE; i++) {
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176 if (FD_ISSET(i, &read_fd_set)) {
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177 int sock = i;
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178 int new;
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179 size = sizeof(clientname);
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180 new = accept(sock, (struct sockaddr *) &clientname, &size);
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181 if (new < 0) {
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182 logwrite(LOG_ALERT, "accept: (ignoring): %s\n", strerror(errno));
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183 } else
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184 accept_connect(sock, new, &clientname);
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185 }
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186 }
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187 } else {
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188 /*
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189 ** If select returns 0, the interval time has elapsed.
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190 ** We start a new queue runner process
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191 */
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192 int pid;
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193 signal(SIGCHLD, sigchld_handler);
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194 if ((pid = fork()) == 0) {
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195 queue_run();
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196
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197 _exit(0);
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198 } else if (pid < 0) {
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199 logwrite(LOG_ALERT, "could not fork for queue run");
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200 }
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201 }
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202 }
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203 }