Mercurial > masqmail-0.2

annotate src/get.c @ 14:a8f3424347dc

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author meillo@marmaro.de
date Wed, 29 Oct 2008 21:21:26 +0100
parents 26e34ae9a3e3
children f671821d8222
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1 /* MasqMail
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2 Copyright (C) 2000-2002 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
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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
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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
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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/file.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 #include "pop3_in.h"
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25
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26 #ifdef ENABLE_POP3
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27
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28 static int volatile sighup_seen = 0;
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29
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30 static void
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31 sighup_handler(int sig)
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32 {
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33 sighup_seen = 1;
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34 signal(SIGHUP, sighup_handler);
0
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35 }
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36
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37 static void
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38 sigchld_handler(int sig)
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39 {
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40 pid_t pid;
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41 int status;
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42
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43 pid = waitpid(0, &status, 0);
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44 if (pid > 0) {
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45 if (WEXITSTATUS(status) != EXIT_SUCCESS)
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46 logwrite(LOG_WARNING, "process %d exited with %d\n", pid, WEXITSTATUS(status));
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47 if (WIFSIGNALED(status))
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48 logwrite(LOG_WARNING, "process with pid %d got signal: %d\n", pid, WTERMSIG(status));
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49 }
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50 signal(SIGCHLD, sigchld_handler);
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51 }
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52
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53 static int
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54 get_lock(get_conf * gc)
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55 {
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56 #ifdef USE_DOTLOCK
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57 gboolean ok = FALSE;
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58 gchar *hitch_name;
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59 gchar *lock_name;
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60
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61 /* the name of the lock is constructed from the user
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62 and the server name, to prevent more than one connection at the same time
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63 to the same server and the same user. This way concurrent connections
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64 are possible to different servers or different users */
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65 hitch_name = g_strdup_printf("%s/masqmail-get-%s@%s-%d.lock", conf.lock_dir, gc->login_user, gc->server_name, getpid());
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66 lock_name = g_strdup_printf("%s/masqmail-get-%s@%s.lock", conf.lock_dir, gc->login_user, gc->server_name);
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67
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68 ok = dot_lock(lock_name, hitch_name);
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69 if (!ok)
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70 logwrite(LOG_WARNING, "getting mail for %s@%s is locked\n", gc->login_user, gc->server_name);
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71
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72 g_free(lock_name);
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73 g_free(hitch_name);
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74
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75 return ok;
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76 #else
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77 gchar *lock_name;
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78 int fd;
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79
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80 lock_name = g_strdup_printf("%s/masqmail-get-%s@%s.lock", conf.lock_dir, gc->login_user, gc->server_name);
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81
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82 if ((fd = open(lock_name, O_WRONLY | O_NDELAY | O_APPEND | O_CREAT, 0600)) >= 0) {
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83 if (flock(fd, LOCK_EX | LOCK_NB) != 0) {
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84 close(fd);
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85 logwrite(LOG_WARNING, "getting mail for %s@%s is locked\n", gc->login_user, gc->server_name);
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86 fd = -1;
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87 }
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88 } else
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89 logwrite(LOG_WARNING, "could not open lock %s: %s\n", lock_name, strerror(errno));
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90
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91 g_free(lock_name);
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92
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93 return fd;
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94 #endif
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95 }
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96
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97 #ifdef USE_DOTLOCK
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98 static gboolean
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99 get_unlock(get_conf * gc)
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100 {
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101 gchar *lock_name lock_name = g_strdup_printf("%s/masqmail-get-%s@%s.lock", conf.lock_dir, gc->login_user, gc->server_name);
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102
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103 dot_unlock(lock_name);
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104 g_free(lock_name);
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105
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106 return TRUE;
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107 }
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108 #else
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109 static void
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110 get_unlock(get_conf * gc, int fd)
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111 {
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112 gchar *lock_name = g_strdup_printf("%s/masqmail-get-%s@%s.lock", conf.lock_dir, gc->login_user, gc->server_name);
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113
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114 flock(fd, LOCK_UN);
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115 close(fd);
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116
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117 unlink(lock_name);
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118 g_free(lock_name);
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119 }
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120 #endif
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121
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122 gboolean
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123 get_from_file(gchar * fname)
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124 {
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125 guint flags = 0;
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126 get_conf *gc = read_get_conf(fname);
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127 gboolean ok = TRUE;
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128 int lock;
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129
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130 if (gc) {
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131 if (!gc->do_keep)
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132 flags |= POP3_FLAG_DELETE;
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133 if (gc->do_uidl)
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134 flags |= POP3_FLAG_UIDL;
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135 if (gc->do_uidl_dele)
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136 flags |= POP3_FLAG_UIDL_DELE;
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137
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138 if (!(gc->server_name)) {
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139 logwrite(LOG_ALERT, "no server name given in %s\n", fname);
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140 return FALSE;
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141 }
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142 if (!(gc->address)) {
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143 logwrite(LOG_ALERT, "no address given in %s\n", fname);
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144 return FALSE;
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145 }
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parents: 0
diff changeset
146 if (!(gc->login_user)) {
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parents: 0
diff changeset
147 logwrite(LOG_ALERT, "no user name given in %s\n", fname);
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parents: 0
diff changeset
148 return FALSE;
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parents: 0
diff changeset
149 }
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parents: 0
diff changeset
150 if (!(gc->login_pass)) {
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parents: 0
diff changeset
151 logwrite(LOG_ALERT, "no password given in %s\n", fname);
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parents: 0
diff changeset
152 return FALSE;
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meillo@marmaro.de
parents: 0
diff changeset
153 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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154
10
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155 DEBUG(3) debugf("flags = %d\n", flags);
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parents: 0
diff changeset
156
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parents: 0
diff changeset
157 if ((strcmp(gc->protocol, "pop3") == 0) || (strcmp(gc->protocol, "apop") == 0)) {
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diff changeset
158 pop3_base *popb = NULL;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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159
10
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parents: 0
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160 if (strcmp(gc->protocol, "apop") == 0) {
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parents: 0
diff changeset
161 flags |= POP3_FLAG_APOP;
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162 DEBUG(3) debugf("attempting to get mail for user %s at host %s for %s@%s with apop\n",
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163 gc->login_user, gc->server_name, gc->address->local_part, gc->address->domain);
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parents: 0
diff changeset
164 } else {
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165 DEBUG(3) debugf("attempting to get mail for user %s at host %s for %s@%s with pop3\n",
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166 gc->login_user, gc->server_name, gc->address->local_part, gc->address->domain);
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parents: 0
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167 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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168 #ifdef USE_DOTLOCK
10
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169 if ((lock = get_lock(gc))) {
0
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parents:
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170 #else
10
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parents: 0
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171 if ((lock = get_lock(gc)) >= 0) {
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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172 #endif
10
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173 if (gc->wrapper) {
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174 popb = pop3_in_open_child(gc->wrapper, flags);
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parents: 0
diff changeset
175 /* quick hack */
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176 popb->remote_host = gc->server_name;
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parents: 0
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177 } else {
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178 popb = pop3_in_open(gc->server_name, gc->server_port, gc->resolve_list, flags);
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parents: 0
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179 }
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180 if (popb) {
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181 ok = pop3_get(popb, gc->login_user, gc->login_pass, gc->address, gc->return_path,
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182 gc->max_count, gc->max_size, gc->max_size_delete);
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parents: 0
diff changeset
183 pop3_in_close(popb);
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parents: 0
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184 } else {
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185 ok = FALSE;
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186 logwrite(LOG_ALERT, "failed to connect to host %s\n", gc->server_name);
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parents: 0
diff changeset
187 }
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parents: 0
diff changeset
188 #ifdef USE_DOTLOCK
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diff changeset
189 get_unlock(gc);
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parents: 0
diff changeset
190 #else
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parents: 0
diff changeset
191 get_unlock(gc, lock);
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parents: 0
diff changeset
192 #endif
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parents: 0
diff changeset
193 }
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parents: 0
diff changeset
194 } else {
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parents: 0
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195 logwrite(LOG_ALERT, "get protocol %s unknown\n", gc->protocol);
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parents: 0
diff changeset
196 ok = FALSE;
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parents: 0
diff changeset
197 }
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parents: 0
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198
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diff changeset
199 destroy_get_conf(gc);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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200 }
10
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parents: 0
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201 return ok;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
202 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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203
10
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diff changeset
204 gboolean
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parents: 0
diff changeset
205 get_from_name(gchar * name)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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206 {
10
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207 gchar *fname = (gchar *) table_find(conf.get_names, name);
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parents: 0
diff changeset
208 if (fname)
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parents: 0
diff changeset
209 return get_from_file(fname);
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diff changeset
210 return FALSE;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
211 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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212
10
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213 gboolean
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parents: 0
diff changeset
214 get_all()
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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215 {
10
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diff changeset
216 GList *get_table = conf.get_names;
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diff changeset
217 GList *get_node;
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diff changeset
218 void (*old_signal) (int);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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219
10
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220 old_signal = signal(SIGCHLD, SIG_DFL);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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221
10
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parents: 0
diff changeset
222 foreach(get_table, get_node) {
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parents: 0
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223 table_pair *pair = (table_pair *) (get_node->data);
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parents: 0
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224 gchar *fname = (gchar *) pair->value;
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parents: 0
diff changeset
225 pid_t pid;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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226
10
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227 pid = fork();
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parents: 0
diff changeset
228 if (pid == 0) {
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229 signal(SIGCHLD, old_signal);
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230 exit(get_from_file(fname) ? EXIT_SUCCESS : EXIT_FAILURE);
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parents: 0
diff changeset
231 } else if (pid > 0) {
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diff changeset
232 int status;
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parents: 0
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233 waitpid(pid, &status, 0);
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parents: 0
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234 if (WEXITSTATUS(status) != EXIT_SUCCESS)
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parents: 0
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235 logwrite(LOG_WARNING, "child returned %d\n", WEXITSTATUS(status));
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parents: 0
diff changeset
236 if (WIFSIGNALED(status))
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237 logwrite(LOG_WARNING, "child got signal: %d\n", WTERMSIG(status));
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parents: 0
diff changeset
238 } else
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parents: 0
diff changeset
239 logwrite(LOG_WARNING, "forking child failed: %s\n", strerror(errno));
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meillo@marmaro.de
parents: 0
diff changeset
240 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
diff changeset
241
10
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parents: 0
diff changeset
242 signal(SIGCHLD, old_signal);
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parents: 0
diff changeset
243
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244 return TRUE;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
245 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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246
10
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diff changeset
247 void
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diff changeset
248 get_online()
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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diff changeset
249 {
10
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diff changeset
250 GList *gf_list = NULL;
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parents: 0
diff changeset
251 gchar *connect_name = detect_online();
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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diff changeset
252
10
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parents: 0
diff changeset
253 if (connect_name != NULL) {
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meillo@marmaro.de
parents: 0
diff changeset
254 void (*old_signal) (int);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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255
10
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parents: 0
diff changeset
256 old_signal = signal(SIGCHLD, SIG_DFL);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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257
10
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diff changeset
258 logwrite(LOG_NOTICE, "detected online configuration %s\n", connect_name);
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parents: 0
diff changeset
259 /* we are online! */
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parents: 0
diff changeset
260 gf_list = (GList *) table_find(conf.online_gets, connect_name);
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parents: 0
diff changeset
261 if (gf_list != NULL) {
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parents: 0
diff changeset
262 GList *node;
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parents: 0
diff changeset
263 foreach(gf_list, node) {
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parents: 0
diff changeset
264 gchar *fname = (gchar *) (node->data);
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meillo@marmaro.de
parents: 0
diff changeset
265 pid_t pid;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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266
10
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parents: 0
diff changeset
267 if (fname[0] != '/')
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parents: 0
diff changeset
268 fname = (gchar *) table_find(conf.get_names, fname);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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269
10
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parents: 0
diff changeset
270 if (fname != NULL) {
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parents: 0
diff changeset
271 pid = fork();
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parents: 0
diff changeset
272 if (pid == 0) {
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parents: 0
diff changeset
273 signal(SIGCHLD, old_signal);
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parents: 0
diff changeset
274 exit(get_from_file(fname) ? EXIT_SUCCESS : EXIT_FAILURE);
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meillo@marmaro.de
parents: 0
diff changeset
275 } else if (pid > 0) {
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parents: 0
diff changeset
276 int status;
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parents: 0
diff changeset
277 waitpid(pid, &status, 0);
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meillo@marmaro.de
parents: 0
diff changeset
278 if (WEXITSTATUS(status) != EXIT_SUCCESS)
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parents: 0
diff changeset
279 logwrite(LOG_WARNING, "child returned %d\n", WEXITSTATUS(status));
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parents: 0
diff changeset
280 if (WIFSIGNALED(status))
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parents: 0
diff changeset
281 logwrite(LOG_WARNING, "child got signal: %d\n", WTERMSIG(status));
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meillo@marmaro.de
parents: 0
diff changeset
282 } else
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parents: 0
diff changeset
283 logwrite(LOG_WARNING, "forking child failed: %s\n", strerror(errno));
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parents: 0
diff changeset
284 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
diff changeset
285 }
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meillo@marmaro.de
parents: 0
diff changeset
286 }
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meillo@marmaro.de
parents: 0
diff changeset
287 signal(SIGCHLD, old_signal);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
288 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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289 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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290
10
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parents: 0
diff changeset
291 void
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parents: 0
diff changeset
292 get_daemon(gint gival, char *argv[])
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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diff changeset
293 {
10
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294 struct timeval tm;
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295 time_t time_before, time_now;
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296 int sel_ret;
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297
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298 /* setup handler for HUP signal: */
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299 signal(SIGHUP, sighup_handler);
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300
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301 /* we can give up root privileges */
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302 if (!conf.run_as_user) {
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303 if (setegid(conf.mail_gid) != 0) {
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304 logwrite(LOG_ALERT, "could not change gid to %d: %s\n", conf.mail_gid, strerror(errno));
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305 exit(EXIT_FAILURE);
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306 }
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307 if (seteuid(conf.mail_uid) != 0) {
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308 logwrite(LOG_ALERT, "could not change uid to %d: %s\n", conf.mail_uid, strerror(errno));
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309 exit(EXIT_FAILURE);
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310 }
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311 }
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312
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313 /* sel_ret = 0; */
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314 time(&time_before);
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315 time_before -= gival;
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316 sel_ret = -1;
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317
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318 while (1) {
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319 /* see listen_port() in listen.c */
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320 if (gival > 0) {
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321 time(&time_now);
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322 if (sel_ret == 0) { /* we are either just starting or did a queue run */
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323 tm.tv_sec = gival;
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324 tm.tv_usec = 0;
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325 time_before = time_now;
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326 } else {
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327 tm.tv_sec = gival - (time_now - time_before);
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328 tm.tv_usec = 0;
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329
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330 /* race condition, very unlikely (but possible): */
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331 if (tm.tv_sec < 0)
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332 tm.tv_sec = 0;
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333 }
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334 }
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335
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336 if ((sel_ret = select(0, NULL, NULL, NULL, &tm)) < 0) {
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337 if (errno != EINTR) {
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338 logwrite(LOG_ALERT, "select: (terminating): %s\n", strerror(errno));
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339 exit(EXIT_FAILURE);
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340 } else {
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341 if (sighup_seen) {
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342 logwrite(LOG_NOTICE, "HUP signal received. Restarting daemon\n");
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343
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344 if (argv == NULL)
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345 exit(EXIT_SUCCESS);
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346
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347 execv(argv[0], &(argv[0]));
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348 logwrite(LOG_ALERT, "restarting failed: %s\n", strerror(errno));
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349 exit(EXIT_FAILURE);
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350
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351 }
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352 }
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353 } else {
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354 /* If select returns 0, the interval time has elapsed.
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355 We start a new get process */
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356 int pid;
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357 signal(SIGCHLD, sigchld_handler);
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358 if ((pid = fork()) == 0) {
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359 get_online();
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360
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361 _exit(EXIT_SUCCESS);
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362 } else if (pid < 0) {
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363 logwrite(LOG_ALERT, "could not fork for get run");
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364 }
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365 }
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366 }
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367 }
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368
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369 gboolean
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370 pop_before_smtp(gchar * fname)
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371 {
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372 gboolean ok = FALSE;
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373 GList *resolve_list = NULL;
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374 get_conf *gc = read_get_conf(fname);
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375 guint flags = 0;
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376
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377 #ifdef ENABLE_RESOLVER
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378 resolve_list = g_list_append(resolve_list, resolve_dns_a);
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379 #endif
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380 resolve_list = g_list_append(resolve_list, resolve_byname);
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381
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382 if (strcmp(gc->protocol, "pop3") == 0) {
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383 DEBUG(3) debugf("attempting to login for user %s, host = %s with pop3\n", gc->login_user, gc->server_name);
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384 ok = pop3_login(gc->server_name, gc->server_port, resolve_list, gc->login_user, gc->login_pass, flags);
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385 } else if (strcmp(gc->protocol, "apop") == 0) {
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386 DEBUG(3) debugf ("attempting to login for user %s, host = %s with apop\n", gc->login_user, gc->server_name);
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387 ok = pop3_login(gc->server_name, gc->server_port, resolve_list, gc->login_user, gc->login_pass, flags | POP3_FLAG_APOP);
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388 } else {
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389 logwrite(LOG_ALERT, "get protocol %s unknown\n", gc->protocol);
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390 }
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391 return ok;
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392 }
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393
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394 #endif