Mercurial > masqmail

annotate src/listen.c @ 197:50011f65bd35

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added comment: TODO file may not be up-to-date there is some stuff in it that is not wanted any longer there are goals not included in it
author meillo@marmaro.de
date Fri, 16 Jul 2010 10:06:32 +0200 (2010-07-16)
parents f671821d8222
children 5745edd5b769
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1 /* MasqMail
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2 Copyright (C) 1999/2000 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
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18
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19 #include <sys/wait.h>
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20 #include <sys/types.h>
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21
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22 #include "masqmail.h"
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23
0
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24 static int volatile sighup_seen = 0;
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25
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26 static void
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27 sighup_handler(int sig)
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28 {
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29 sighup_seen = 1;
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30 signal(SIGHUP, sighup_handler);
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31 }
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32
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33 static void
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34 sigchld_handler(int sig)
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35 {
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36 pid_t pid;
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37 int status;
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38
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39 pid = waitpid(0, &status, 0);
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40 if (pid > 0) {
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41 if (WEXITSTATUS(status) != EXIT_SUCCESS)
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42 logwrite(LOG_WARNING, "process %d exited with %d\n", pid, WEXITSTATUS(status));
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43 if (WIFSIGNALED(status))
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44 logwrite(LOG_WARNING, "process with pid %d got signal: %d\n", pid, WTERMSIG(status));
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45 }
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46 signal(SIGCHLD, sigchld_handler);
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47 }
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48
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49 #ifdef ENABLE_SMTP_SERVER
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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 #ifdef ENABLE_IDENT
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61 {
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62 gchar *id = NULL;
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63 if ((id = (gchar *) ident_id(sock, 60))) {
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64 ident = g_strdup(id);
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65 }
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66 logwrite(LOG_NOTICE, "connect from host %s, port %hd ident=%s\n", rem_host,
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67 ntohs(sock_addr->sin_port), ident ? ident : "(unknown)");
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68 }
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69 #else
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70 logwrite(LOG_NOTICE, "connect from host %s, port %hd\n", rem_host, ntohs(sock_addr->sin_port));
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71 #endif
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72
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73 // start child for connection:
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74 signal(SIGCHLD, sigchld_handler);
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75 pid = fork();
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76 if (pid == 0) {
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77 close(listen_sock);
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78 out = fdopen(sock, "w");
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79 in = fdopen(dup_sock, "r");
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80
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81 smtp_in(in, out, rem_host, ident);
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82
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83 _exit(EXIT_SUCCESS);
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84 } else if (pid < 0) {
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85 logwrite(LOG_WARNING, "could not fork for incoming smtp connection: %s\n", strerror(errno));
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86 }
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87 #ifdef ENABLE_IDENT
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88 if (ident != NULL)
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89 g_free(ident);
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90 #endif
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91
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92 close(sock);
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93 close(dup_sock);
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94 }
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95 #endif /*ifdef ENABLE_SMTP_SERVER */
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96
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97 void
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98 listen_port(GList * iface_list, gint qival, char *argv[])
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99 {
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100 int i;
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101 fd_set active_fd_set, read_fd_set;
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102 struct timeval tm;
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103 time_t time_before, time_now;
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104 struct sockaddr_in clientname;
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105 size_t size;
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106 GList *node, *node_next;
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107 int sel_ret;
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108
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109 /* Create the sockets and set them up to accept connections. */
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110 FD_ZERO(&active_fd_set);
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111 #ifdef ENABLE_SMTP_SERVER
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112 for (node = g_list_first(iface_list); node; node = node_next) {
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113 interface *iface = (interface *) (node->data);
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114 int sock;
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115
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116 node_next = g_list_next(node);
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117 if ((sock = make_server_socket(iface)) < 0) {
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118 iface_list = g_list_remove_link(iface_list, node);
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119 g_list_free_1(node);
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120 continue;
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121 }
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122 if (listen(sock, 1) < 0) {
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123 logwrite(LOG_ALERT, "listen: (terminating): %s\n", strerror(errno));
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124 exit(EXIT_FAILURE);
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125 }
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126 logwrite(LOG_NOTICE, "listening on interface %s:%d\n", iface->address, iface->port);
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127 DEBUG(5) debugf("sock = %d\n", sock);
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128 FD_SET(sock, &active_fd_set);
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129 }
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130 #endif
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131
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132 /* setup handler for HUP signal: */
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133 signal(SIGHUP, sighup_handler);
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134 signal(SIGCHLD, sigchld_handler);
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135
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136 /* now that we have our socket(s), we can give up root privileges */
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137 if (!conf.run_as_user) {
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138 if (setegid(conf.mail_gid) != 0) {
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139 logwrite(LOG_ALERT, "could not change gid to %d: %s\n", conf.mail_gid, strerror(errno));
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140 exit(EXIT_FAILURE);
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141 }
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142 if (seteuid(conf.mail_uid) != 0) {
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143 logwrite(LOG_ALERT, "could not change uid to %d: %s\n", conf.mail_uid, strerror(errno));
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144 exit(EXIT_FAILURE);
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145 }
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146 }
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147
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148 /* sel_ret = 0; */
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149 time(&time_before);
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150 time_before -= qival;
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151 sel_ret = -1;
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152
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153 while (1) {
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154
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155 /* if we were interrupted by an incoming connection (or a signal)
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156 we have to recalculate the time until the next queue run should
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157 occur. select may put a value into tm, but doc for select() says
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158 we should not use it. */
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159 if (qival > 0) {
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160 time(&time_now);
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161 if (sel_ret == 0) { /* we are either just starting or did a queue run */
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162 tm.tv_sec = qival;
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163 tm.tv_usec = 0;
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164 time_before = time_now;
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165 } else {
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166 tm.tv_sec = qival - (time_now - time_before);
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167 tm.tv_usec = 0;
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168
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169 /* race condition, very unlikely (but possible): */
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170 if (tm.tv_sec < 0)
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171 tm.tv_sec = 0;
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172 }
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173 }
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174 /* Block until input arrives on one or more active sockets,
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175 or signal arrives, or queuing interval time elapsed (if qival > 0) */
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176 read_fd_set = active_fd_set;
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177 if ((sel_ret = select(FD_SETSIZE, &read_fd_set, NULL, NULL, qival > 0 ? &tm : NULL)) < 0) {
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178 if (errno != EINTR) {
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179 logwrite(LOG_ALERT, "select: (terminating): %s\n", strerror(errno));
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180 exit(EXIT_FAILURE);
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181 } else {
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182 if (sighup_seen) {
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183 logwrite(LOG_NOTICE, "HUP signal received. Restarting daemon\n");
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184
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185 for (i = 0; i < FD_SETSIZE; i++)
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186 if (FD_ISSET(i, &active_fd_set))
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187 close(i);
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188
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189 execv(argv[0], &(argv[0]));
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190 logwrite(LOG_ALERT, "restarting failed: %s\n", strerror(errno));
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191 exit(EXIT_FAILURE);
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192 }
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193 }
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194 } else if (sel_ret > 0) {
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195 #ifdef ENABLE_SMTP_SERVER
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196 for (i = 0; i < FD_SETSIZE; i++) {
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197 if (FD_ISSET(i, &read_fd_set)) {
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198 int sock = i;
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199 int new;
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200 size = sizeof(clientname);
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201 new = accept(sock, (struct sockaddr *) &clientname, &size);
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202 if (new < 0) {
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203 logwrite(LOG_ALERT, "accept: (ignoring): %s\n", strerror(errno));
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204 } else
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205 accept_connect(sock, new, &clientname);
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206 }
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207 }
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208 #else
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209 ;
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210 #endif
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211 } else {
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212 /* If select returns 0, the interval time has elapsed.
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213 We start a new queue runner process */
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214 int pid;
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215 signal(SIGCHLD, sigchld_handler);
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216 if ((pid = fork()) == 0) {
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217 queue_run();
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218
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219 _exit(EXIT_SUCCESS);
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220 } else if (pid < 0) {
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221 logwrite(LOG_ALERT, "could not fork for queue run");
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222 }
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223 }
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224 }
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225 }