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annotate src/local.c @ 202:5cecc214afc9

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added docs/howto-static-linking
author meillo@marmaro.de
date Fri, 16 Jul 2010 14:43:55 +0200
parents d1c53e76096f
children 4fd237550525
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1 /* MasqMail
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2 Copyright (C) 1999-2001 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
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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/stat.h>
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21
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22 #include "masqmail.h"
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23 #include "peopen.h"
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25 static void
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26 message_stream(FILE * out, message * msg, GList * hdr_list, guint flags)
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27 {
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28 time_t now = time(NULL);
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29 GList *node;
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30
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31 if (flags & MSGSTR_FROMLINE) {
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32 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part, msg->return_path->domain, ctime(&now));
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33 }
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34
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35 foreach(hdr_list, node) {
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36 header *hdr = (header *) (node->data);
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37 fputs(hdr->header, out);
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38 }
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39 putc('\n', out);
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40 foreach(msg->data_list, node) {
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41 /* From hack: */
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42 if (flags & MSGSTR_FROMHACK) {
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43 if (strncmp(node->data, "From ", 5) == 0)
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44 putc('>', out);
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45 }
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46 fputs(node->data, out);
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47 }
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48 putc('\n', out);
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49 }
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50
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51 gboolean
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52 append_file(message * msg, GList * hdr_list, gchar * user)
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53 {
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54 struct passwd *pw;
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55 gboolean ok = FALSE;
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56
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57 /* headers may be special for a local delivery */
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58 if (hdr_list == NULL)
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59 hdr_list = msg->hdr_list;
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60
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61 if ((pw = getpwnam(user))) {
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62 uid_t saved_uid = geteuid();
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63 gid_t saved_gid = getegid();
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64 gboolean uid_ok = TRUE, gid_ok = TRUE;
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66 if (!conf.run_as_user) {
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67 uid_ok = (seteuid(0) == 0);
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68 if (uid_ok) {
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69 gid_ok = (setegid(conf.mail_gid) == 0);
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70 uid_ok = (seteuid(pw->pw_uid) == 0);
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71 }
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72 }
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73
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74 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
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76 if (uid_ok && gid_ok) {
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77 gchar *filename;
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78 FILE *out;
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79
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80 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
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81 if ((out = fopen(filename, "a"))) {
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82 #ifdef USE_LIBLOCKFILE
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83 gint err;
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84 /* lock file using liblockfile */
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85 err = maillock(user, 3);
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86 if (err == 0) {
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87 #else
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88 /* lock file: */
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89 struct flock lock;
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90 lock.l_type = F_WRLCK;
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91 lock.l_whence = SEEK_END;
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92 lock.l_start = lock.l_len = 0;
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93 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
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94 #endif
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95 fchmod(fileno(out), 0600);
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96 message_stream(out, msg, hdr_list, MSGSTR_FROMLINE | MSGSTR_FROMHACK);
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97 ok = TRUE;
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98
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99 /* close when still user */
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100 fclose(out);
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101 #ifdef USE_LIBLOCKFILE
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102 mailunlock();
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103 #endif
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104 } else {
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105 fclose(out);
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106 #ifdef USE_LIBLOCKFILE
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107 DEBUG(3) debugf("could not lock file %s: error %d\n", filename, err);
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108 } /* XEmacs indenting convenience... */
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109 #else
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110 DEBUG(3) debugf("could not lock file %s: %s\n", filename, strerror(errno));
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111 }
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112 #endif
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113 } else {
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114 logwrite(LOG_ALERT, "could not open file %s: %s\n", filename, strerror(errno));
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115 }
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116 g_free(filename);
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117
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118 if (!conf.run_as_user) {
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119 uid_ok = (seteuid(0) == 0);
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120 if (uid_ok) {
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121 gid_ok = (setegid(saved_gid) == 0);
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122 uid_ok = (seteuid(saved_uid) == 0);
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123 }
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124 }
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125
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126 if (!uid_ok || !gid_ok) {
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127 /* FIXME: if this fails we HAVE to exit, because we shall not run
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128 with some users id. But we do not return, and so this message
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129 will not be finished, so the user will get the message again
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130 next time a delivery is attempted... */
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131 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
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132 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, want = %d, %d\n",
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133 getuid(), getgid(), geteuid(), getegid(), saved_uid, saved_gid);
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134 exit(EXIT_FAILURE);
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135 }
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136 } else {
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137 logwrite(LOG_ALERT, "could not set uid or gid for local delivery, uid = %d: %s\n", pw->pw_uid, strerror(errno));
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138 }
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139 } else {
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140 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
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141 errno = ENOENT; /* getpwnam does not set errno correctly */
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142 }
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143
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144 return ok;
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145 }
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146
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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147 #ifdef ENABLE_MAILDIR
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148 gboolean
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149 maildir_out(message * msg, GList * hdr_list, gchar * user, guint flags)
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150 {
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151 struct passwd *pw;
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152 gboolean ok = FALSE;
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153
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154 /* headers may be special for a local delivery */
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155 if (hdr_list == NULL)
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156 hdr_list = msg->hdr_list;
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157
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158 if ((pw = getpwnam(user))) {
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159 uid_t saved_uid = geteuid();
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160 gid_t saved_gid = getegid();
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161 gboolean uid_ok = TRUE, gid_ok = TRUE;
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162
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163 if (!conf.run_as_user) {
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164 uid_ok = (seteuid(0) == 0);
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165 if (uid_ok) {
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166 gid_ok = (setegid(conf.mail_gid) == 0);
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167 uid_ok = (seteuid(pw->pw_uid) == 0);
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168 }
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169 }
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170
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171 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
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172
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173 if (uid_ok && gid_ok) {
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174 char *path = g_strdup_printf("%s/Maildir", pw->pw_dir);
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175 struct stat statbuf;
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176 int ret;
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177
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178 DEBUG(5) debugf(" path = %s\n", path);
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179
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180 ok = TRUE;
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181 ret = stat(path, &statbuf);
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182 if (ret != 0) {
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183 ok = FALSE;
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184 if (errno == ENOENT) {
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185 logwrite(LOG_NOTICE, "directory %s does not exist, creating\n", path);
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186 if (mkdir(path, 0700) == 0)
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187 ok = TRUE;
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188 } else
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189 logwrite(LOG_ALERT, "stat of %s failed: %s\n", path, strerror(errno));
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190 }
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191 if (ok) {
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192 ok = FALSE;
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193 ret = stat(path, &statbuf);
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194 if (S_ISDIR(statbuf.st_mode)) {
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195 gchar *subdirs[] = { "tmp", "new", "cur" };
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196 int i;
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197 for (i = 0; i < 3; i++) {
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198 char *path1 = g_strdup_printf("%s/%s", path, subdirs[i]);
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199 ret = stat(path1, &statbuf);
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200 if (ret != 0) {
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201 if (errno == ENOENT) {
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202 logwrite(LOG_NOTICE, "directory %s does not exist, creating\n", path1);
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203 if (mkdir(path1, 0700) != 0)
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204 break;
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205 }
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206 }
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207 g_free(path1);
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208 }
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209 if (i == 3) {
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210 FILE *out;
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211 mode_t saved_mode = umask(066);
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212 /* the qmail style unique works only if delivering with different process.
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213 We do not fork for each delivery, so our uid is more unique.
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214 Hope it is compatible with all MUAs.
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215 */
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216 gchar *filename = g_strdup_printf("%s/tmp/%s.%s", path, msg->uid, conf.host_name);
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217
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218 DEBUG(5) debugf("filename = %s\n", filename);
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219
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220 if ((out = fopen(filename, "w"))) {
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221 gchar *newname = g_strdup_printf("%s/new/%s.%s", path, msg->uid, conf.host_name);
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222 message_stream(out, msg, hdr_list, flags);
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223 ok = TRUE;
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224 if (fflush(out) == EOF)
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225 ok = FALSE;
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226 else if (fdatasync(fileno(out)) != 0) {
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227 if (errno != EINVAL)
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228 /* some fs do not support this.. I hope this also means that it is not necessary */
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229 ok = FALSE;
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230 }
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231 fclose(out);
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232 if (rename(filename, newname) != 0) {
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233 ok = FALSE;
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234 logwrite(LOG_ALERT, "moving %s to %s failed: %s", filename, newname, strerror(errno));
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235 }
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236 g_free(newname);
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237 }
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238 umask(saved_mode);
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239 g_free(filename);
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240 }
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241 } else {
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242 logwrite(LOG_ALERT, "%s is not a directory\n", path);
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243 errno = ENOTDIR;
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244 }
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245 }
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246 if (!conf.run_as_user) {
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247 uid_ok = (seteuid(0) == 0);
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248 if (uid_ok) {
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249 gid_ok = (setegid(saved_gid) == 0);
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250 uid_ok = (seteuid(saved_uid) == 0);
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251 }
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252 }
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253 if (!uid_ok || !gid_ok) {
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254 /* FIXME: if this fails we HAVE to exit, because we shall not run
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255 with some users id. But we do not return, and so this message
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256 will not be finished, so the user will get the message again
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257 next time a delivery is attempted... */
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258 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
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259 exit(EXIT_FAILURE);
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260 }
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261 g_free(path);
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262 } else {
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263 logwrite(LOG_ALERT, "could not set uid or gid for local delivery, uid = %d: %s\n", pw->pw_uid, strerror(errno));
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264 }
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265 } else {
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266 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
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267 errno = ENOENT; /* getpwnam does not set errno correctly */
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268 }
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269 return ok;
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270 }
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271 #endif
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272
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273 gboolean
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274 pipe_out(message * msg, GList * hdr_list, address * rcpt, gchar * cmd, guint flags)
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275 {
10
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276 gchar *envp[40];
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277 FILE *out;
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278 uid_t saved_uid = geteuid();
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279 gid_t saved_gid = getegid();
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280 gboolean ok = FALSE;
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281 gint i, n;
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282 pid_t pid;
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283 void (*old_signal) (int);
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284 int status;
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285
10
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286 /* set uid and gid to the mail ids */
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287 if (!conf.run_as_user) {
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288 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
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289 }
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290
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291 /* set environment */
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292 {
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293 gint i = 0;
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294 address *ancestor = addr_find_ancestor(rcpt);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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295
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296 envp[i++] = g_strdup_printf("SENDER=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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297 envp[i++] = g_strdup_printf("SENDER_DOMAIN=%s", msg->return_path->domain);
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298 envp[i++] = g_strdup_printf("SENDER_LOCAL=%s", msg->return_path->local_part);
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299 envp[i++] = g_strdup_printf("RECEIVED_HOST=%s", msg->received_host ? msg->received_host : "");
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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300
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301 envp[i++] = g_strdup_printf("RETURN_PATH=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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302 envp[i++] = g_strdup_printf("DOMAIN=%s", ancestor->domain);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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303
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304 envp[i++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
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305 envp[i++] = g_strdup_printf("USER=%s", ancestor->local_part);
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306 envp[i++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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307
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308 envp[i++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
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309 envp[i++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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310
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311 envp[i] = NULL;
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312 n = i;
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313 }
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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314
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315 old_signal = signal(SIGCHLD, SIG_DFL);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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316
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317 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
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318 if (out != NULL) {
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319 message_stream(out, msg, hdr_list, flags);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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320
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321 fclose(out);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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322
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323 waitpid(pid, &status, 0);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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324
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325 if (WEXITSTATUS(status) != 0) {
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326 int exstat = WEXITSTATUS(status);
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327 logwrite(LOG_ALERT, "process returned %d (%s)\n", exstat, ext_strerror(1024 + exstat));
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328 errno = 1024 + exstat;
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329 } else if (WIFSIGNALED(status)) {
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330 logwrite(LOG_ALERT, "process got signal %d\n", WTERMSIG(status));
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331 } else
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332 ok = TRUE;
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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333
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334 } else
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335 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", cmd, strerror(errno));
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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336
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337 signal(SIGCHLD, old_signal);
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338
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339 /* free environment */
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340 for (i = 0; i < n; i++) {
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341 g_free(envp[i]);
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342 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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343
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344 /* set uid and gid back */
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345 if (!conf.run_as_user) {
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346 set_euidgid(saved_uid, saved_gid, NULL, NULL);
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347 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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348
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349 return ok;
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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350 }