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Removes Freshmeat.net from the docs The site, which was later renamed to freecode.com, is no longer maintained (contains only a static copy).
author markus schnalke <meillo@marmaro.de>
date Sat, 07 Feb 2015 11:45:07 +0100
parents 180a7f6a9383
children
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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.
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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",
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44 pid, WEXITSTATUS(status));
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45 }
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46 if (WIFSIGNALED(status)) {
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47 logwrite(LOG_WARNING, "process %d got signal: %d\n",
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48 pid, WTERMSIG(status));
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49 }
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50 }
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51 signal(SIGCHLD, sigchld_handler);
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52 }
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53
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54 void
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55 accept_connect(int listen_sock, int sock, struct sockaddr_in *sock_addr)
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56 {
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57 pid_t pid;
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58 int dup_sock = dup(sock);
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59 FILE *out, *in;
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60 gchar *rem_host;
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61 gchar *ident = NULL;
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62
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63 rem_host = g_strdup(inet_ntoa(sock_addr->sin_addr));
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64 logwrite(LOG_NOTICE, "connect from host %s, port %hu\n",
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65 rem_host, ntohs(sock_addr->sin_port));
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66
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67 /* start child for connection: */
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68 signal(SIGCHLD, sigchld_handler);
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69 pid = fork();
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70 if (pid < 0) {
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71 logwrite(LOG_WARNING, "could not fork for incoming smtp "
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72 "connection: %s\n", strerror(errno));
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73 } else if (pid == 0) {
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74 /* child */
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75 close(listen_sock);
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76 out = fdopen(sock, "w");
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77 in = fdopen(dup_sock, "r");
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78 smtp_in(in, out, rem_host, ident);
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79 _exit(0);
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80 }
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81
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82 close(sock);
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83 close(dup_sock);
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84 }
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86 void
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87 listen_port(GList *iface_list, gint qival, char *argv[])
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88 {
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89 int i;
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90 fd_set active_fd_set, read_fd_set;
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91 struct timeval tm;
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92 time_t time_before, time_now;
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93 struct sockaddr_in clientname;
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94 size_t size;
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95 GList *node, *node_next;
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96 int sel_ret;
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97
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98 /* Create the sockets and set them up to accept connections. */
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99 FD_ZERO(&active_fd_set);
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100 for (node = g_list_first(iface_list); node; node = node_next) {
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101 interface *iface = (interface *) (node->data);
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102 int sock;
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103
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104 node_next = g_list_next(node);
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105 if ((sock = make_server_socket(iface)) < 0) {
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106 iface_list = g_list_remove_link(iface_list, node);
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107 g_list_free_1(node);
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108 continue;
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109 }
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110 if (listen(sock, 1) < 0) {
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111 logwrite(LOG_ALERT, "listen: (terminating): %s\n",
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112 strerror(errno));
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113 exit(1);
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114 }
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115 logwrite(LOG_NOTICE, "listening on interface %s:%d\n",
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116 iface->address, iface->port);
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117 DEBUG(5) debugf("sock = %d\n", sock);
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118 FD_SET(sock, &active_fd_set);
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119 }
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120
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121 /* setup handler for HUP signal: */
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122 signal(SIGHUP, sighup_handler);
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123 signal(SIGCHLD, sigchld_handler);
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124
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125 /* now that we have our socket(s), we can give up root privileges */
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126 if (!conf.run_as_user) {
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127 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
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128 }
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129
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130 /* sel_ret = 0; */
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131 time(&time_before);
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132 time_before -= qival;
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133 sel_ret = -1;
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134
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135 while (1) {
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136
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137 /*
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138 ** if we were interrupted by an incoming connection (or a
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139 ** signal) we have to recalculate the time until the next
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140 ** queue run should occur. select may put a value into tm,
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141 ** but doc for select() says we should not use it.
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142 */
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143 if (qival > 0) {
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144 time(&time_now);
384
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145 if (!sel_ret) {
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146 /* either just starting or after a queue run */
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147 tm.tv_sec = qival;
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148 tm.tv_usec = 0;
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149 time_before = time_now;
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150 } else {
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151 tm.tv_sec = qival - (time_now - time_before);
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152 tm.tv_usec = 0;
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153
384
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154 /* race condition, unlikely (but possible): */
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155 if (tm.tv_sec < 0) {
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156 tm.tv_sec = 0;
384
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157 }
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158 }
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159 }
367
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160 /*
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161 ** Block until input arrives on one or more active sockets,
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162 ** or signal arrives, or queuing interval time elapsed
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163 ** (if qival > 0)
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164 */
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165 read_fd_set = active_fd_set;
384
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166 if ((sel_ret = select(FD_SETSIZE, &read_fd_set, NULL, NULL,
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167 qival > 0 ? &tm : NULL)) < 0) {
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168 if (errno != EINTR) {
384
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169 logwrite(LOG_ALERT, "select: (terminating): "
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170 "%s\n", strerror(errno));
262
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171 exit(1);
384
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172 } else if (sighup_seen) {
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173 logwrite(LOG_NOTICE, "HUP signal received. "
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174 "Restarting daemon\n");
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175
384
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176 for (i = 0; i < FD_SETSIZE; i++)
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177 if (FD_ISSET(i, &active_fd_set))
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178 close(i);
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179
384
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180 execv(argv[0], &(argv[0]));
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181 logwrite(LOG_ALERT, "restarting failed: %s\n",
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182 strerror(errno));
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183 exit(1);
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184 }
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185 } else if (sel_ret > 0) {
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186 for (i = 0; i < FD_SETSIZE; i++) {
384
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187 int sock = i;
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188 int new;
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189
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190 if (!FD_ISSET(i, &read_fd_set)) {
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191 continue;
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192 }
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193 size = sizeof(clientname);
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194 new = accept(sock, (struct sockaddr *)
430
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195 &clientname,
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196 (socklen_t *)&size);
384
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197 if (new < 0) {
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198 logwrite(LOG_ALERT, "accept: (ignoring): %s\n", strerror(errno));
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199 } else {
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200 accept_connect(sock, new,
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201 &clientname);
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202 }
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203 }
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204 } else {
367
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205 /*
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206 ** If select returns 0, the interval time has elapsed.
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207 ** We start a new queue runner process
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208 */
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209 int pid;
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210 signal(SIGCHLD, sigchld_handler);
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211 if ((pid = fork()) == 0) {
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212 queue_run();
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213
262
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214 _exit(0);
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215 } else if (pid < 0) {
384
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216 logwrite(LOG_ALERT, "could not fork for "
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217 "queue run");
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218 }
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219 }
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220 }
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221 }