Mercurial > masqmail-0.2

annotate src/local.c @ 114:a80ebfa16cd5

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better debugging output (thanks to Paolo)
author meillo@marmaro.de
date Wed, 30 Jun 2010 15:00:59 +0200
parents f671821d8222
children d1c53e76096f
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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
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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
15
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19 #include <sys/wait.h>
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20
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21 #include "masqmail.h"
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22 #include "peopen.h"
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23
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24 static void
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25 message_stream(FILE * out, message * msg, GList * hdr_list, guint flags)
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26 {
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27 time_t now = time(NULL);
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28 GList *node;
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29
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30 if (flags & MSGSTR_FROMLINE) {
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31 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part, msg->return_path->domain, ctime(&now));
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32 }
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33
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34 foreach(hdr_list, node) {
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35 header *hdr = (header *) (node->data);
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36 fputs(hdr->header, out);
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37 }
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38 putc('\n', out);
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39 foreach(msg->data_list, node) {
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40 /* From hack: */
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41 if (flags & MSGSTR_FROMHACK) {
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42 if (strncmp(node->data, "From ", 5) == 0)
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43 putc('>', out);
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44 }
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45 fputs(node->data, out);
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46 }
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47 putc('\n', out);
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48 }
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49
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50 gboolean
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51 append_file(message * msg, GList * hdr_list, gchar * user)
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52 {
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53 struct passwd *pw;
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54 gboolean ok = FALSE;
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55
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56 /* headers may be special for a local delivery */
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57 if (hdr_list == NULL)
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58 hdr_list = msg->hdr_list;
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59
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60 if ((pw = getpwnam(user))) {
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61 uid_t saved_uid = geteuid();
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62 gid_t saved_gid = getegid();
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63 gboolean uid_ok = TRUE, gid_ok = TRUE;
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64
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65 if (!conf.run_as_user) {
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66 uid_ok = (seteuid(0) == 0);
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67 if (uid_ok) {
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68 gid_ok = (setegid(conf.mail_gid) == 0);
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69 uid_ok = (seteuid(pw->pw_uid) == 0);
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70 }
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71 }
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72
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73 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
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75 if (uid_ok && gid_ok) {
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76 gchar *filename;
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77 FILE *out;
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78
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79 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
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80 if ((out = fopen(filename, "a"))) {
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81 #ifdef USE_LIBLOCKFILE
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82 gint err;
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83 /* lock file using liblockfile */
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84 err = maillock(user, 3);
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85 if (err == 0) {
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86 #else
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87 /* lock file: */
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88 struct flock lock;
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89 lock.l_type = F_WRLCK;
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90 lock.l_whence = SEEK_END;
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91 lock.l_start = lock.l_len = 0;
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92 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
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93 #endif
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94 fchmod(fileno(out), 0600);
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95 message_stream(out, msg, hdr_list, MSGSTR_FROMLINE | MSGSTR_FROMHACK);
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96 ok = TRUE;
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97
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98 /* close when still user */
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99 fclose(out);
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100 #ifdef USE_LIBLOCKFILE
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101 mailunlock();
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102 #endif
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103 } else {
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104 fclose(out);
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105 #ifdef USE_LIBLOCKFILE
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106 DEBUG(3) debugf("could not lock file %s: error %d\n", filename, err);
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107 } /* XEmacs indenting convenience... */
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108 #else
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109 DEBUG(3) debugf("could not lock file %s: %s\n", filename, strerror(errno));
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110 }
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111 #endif
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112 } else {
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113 logwrite(LOG_ALERT, "could not open file %s: %s\n", filename, strerror(errno));
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114 }
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115 g_free(filename);
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116
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117 if (!conf.run_as_user) {
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118 uid_ok = (seteuid(0) == 0);
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119 if (uid_ok) {
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120 gid_ok = (setegid(saved_gid) == 0);
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121 uid_ok = (seteuid(saved_uid) == 0);
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122 }
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123 }
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124
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125 if (!uid_ok || !gid_ok) {
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126 /* FIXME: if this fails we HAVE to exit, because we shall not run
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127 with some users id. But we do not return, and so this message
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128 will not be finished, so the user will get the message again
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129 next time a delivery is attempted... */
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130 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
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131 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, want = %d, %d\n",
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132 getuid(), getgid(), geteuid(), getegid(), saved_uid, saved_gid);
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133 exit(EXIT_FAILURE);
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134 }
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135 } else {
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136 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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137 }
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138 } else {
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139 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
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140 errno = ENOENT; /* getpwnam does not set errno correctly */
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141 }
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142
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143 return ok;
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144 }
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145
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146 #ifdef ENABLE_MAILDIR
10
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147 gboolean
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148 maildir_out(message * msg, GList * hdr_list, gchar * user, guint flags)
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149 {
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150 struct passwd *pw;
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151 gboolean ok = FALSE;
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152
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153 /* headers may be special for a local delivery */
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154 if (hdr_list == NULL)
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155 hdr_list = msg->hdr_list;
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156
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157 if ((pw = getpwnam(user))) {
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158 uid_t saved_uid = geteuid();
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159 gid_t saved_gid = getegid();
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160 gboolean uid_ok = TRUE, gid_ok = TRUE;
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161
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162 if (!conf.run_as_user) {
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163 uid_ok = (seteuid(0) == 0);
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164 if (uid_ok) {
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165 gid_ok = (setegid(conf.mail_gid) == 0);
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166 uid_ok = (seteuid(pw->pw_uid) == 0);
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167 }
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168 }
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169
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170 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
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171
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172 if (uid_ok && gid_ok) {
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173 char *path = g_strdup_printf("%s/Maildir", pw->pw_dir);
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174 struct stat statbuf;
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175 int ret;
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176
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177 DEBUG(5) debugf(" path = %s\n", path);
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178
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179 ok = TRUE;
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180 ret = stat(path, &statbuf);
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181 if (ret != 0) {
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182 ok = FALSE;
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183 if (errno == ENOENT) {
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184 logwrite(LOG_NOTICE, "directory %s does not exist, creating\n", path);
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185 if (mkdir(path, 0700) == 0)
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186 ok = TRUE;
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187 } else
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188 logwrite(LOG_ALERT, "stat of %s failed: %s\n", path, strerror(errno));
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189 }
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190 if (ok) {
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191 ok = FALSE;
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192 ret = stat(path, &statbuf);
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193 if (S_ISDIR(statbuf.st_mode)) {
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194 gchar *subdirs[] = { "tmp", "new", "cur" };
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195 int i;
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196 for (i = 0; i < 3; i++) {
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197 char *path1 = g_strdup_printf("%s/%s", path, subdirs[i]);
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198 ret = stat(path1, &statbuf);
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199 if (ret != 0) {
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200 if (errno == ENOENT) {
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201 logwrite(LOG_NOTICE, "directory %s does not exist, creating\n", path1);
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202 if (mkdir(path1, 0700) != 0)
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203 break;
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204 }
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205 }
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206 g_free(path1);
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207 }
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208 if (i == 3) {
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209 FILE *out;
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210 mode_t saved_mode = umask(066);
15
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211 /* the qmail style unique works only if delivering with different process.
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212 We do not fork for each delivery, so our uid is more unique.
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213 Hope it is compatible with all MUAs.
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214 */
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215 gchar *filename = g_strdup_printf("%s/tmp/%s.%s", path, msg->uid, conf.host_name);
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216
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217 DEBUG(5) debugf("filename = %s\n", filename);
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218
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219 if ((out = fopen(filename, "w"))) {
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220 gchar *newname = g_strdup_printf("%s/new/%s.%s", path, msg->uid, conf.host_name);
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221 message_stream(out, msg, hdr_list, flags);
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222 ok = TRUE;
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223 if (fflush(out) == EOF)
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224 ok = FALSE;
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225 else if (fdatasync(fileno(out)) != 0) {
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226 if (errno != EINVAL)
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227 /* some fs do not support this.. I hope this also means that it is not necessary */
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228 ok = FALSE;
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229 }
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230 fclose(out);
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parents: 0
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231 if (rename(filename, newname) != 0) {
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232 ok = FALSE;
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233 logwrite(LOG_ALERT, "moving %s to %s failed: %s", filename, newname, strerror(errno));
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234 }
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235 g_free(newname);
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236 }
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237 umask(saved_mode);
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238 g_free(filename);
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239 }
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240 } else {
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241 logwrite(LOG_ALERT, "%s is not a directory\n", path);
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242 errno = ENOTDIR;
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243 }
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244 }
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parents: 0
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245 if (!conf.run_as_user) {
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246 uid_ok = (seteuid(0) == 0);
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247 if (uid_ok) {
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248 gid_ok = (setegid(saved_gid) == 0);
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249 uid_ok = (seteuid(saved_uid) == 0);
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250 }
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251 }
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parents: 0
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252 if (!uid_ok || !gid_ok) {
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parents: 0
diff changeset
253 /* FIXME: if this fails we HAVE to exit, because we shall not run
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254 with some users id. But we do not return, and so this message
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255 will not be finished, so the user will get the message again
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256 next time a delivery is attempted... */
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257 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
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258 exit(EXIT_FAILURE);
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259 }
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260 g_free(path);
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261 } else {
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262 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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263 }
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264 } else {
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265 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
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266 errno = ENOENT; /* getpwnam does not set errno correctly */
0
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267 }
10
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268 return ok;
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269 }
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270 #endif
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271
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272 gboolean
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273 pipe_out(message * msg, GList * hdr_list, address * rcpt, gchar * cmd, guint flags)
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274 {
10
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275 gchar *envp[40];
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276 FILE *out;
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277 uid_t saved_uid = geteuid();
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278 gid_t saved_gid = getegid();
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279 gboolean ok = FALSE;
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280 gint i, n;
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281 pid_t pid;
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diff changeset
282 void (*old_signal) (int);
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283 int status;
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284
10
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285 /* set uid and gid to the mail ids */
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parents: 0
diff changeset
286 if (!conf.run_as_user) {
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287 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
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288 }
0
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289
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290 /* set environment */
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parents: 0
diff changeset
291 {
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292 gint i = 0;
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293 address *ancestor = addr_find_ancestor(rcpt);
0
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294
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295 envp[i++] = g_strdup_printf("SENDER=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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296 envp[i++] = g_strdup_printf("SENDER_DOMAIN=%s", msg->return_path->domain);
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297 envp[i++] = g_strdup_printf("SENDER_LOCAL=%s", msg->return_path->local_part);
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298 envp[i++] = g_strdup_printf("RECEIVED_HOST=%s", msg->received_host ? msg->received_host : "");
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299
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300 envp[i++] = g_strdup_printf("RETURN_PATH=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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301 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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302
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303 envp[i++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
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304 envp[i++] = g_strdup_printf("USER=%s", ancestor->local_part);
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305 envp[i++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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306
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307 envp[i++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
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308 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
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309
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310 envp[i] = NULL;
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311 n = i;
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312 }
0
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313
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314 old_signal = signal(SIGCHLD, SIG_DFL);
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315
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316 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
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317 if (out != NULL) {
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318 message_stream(out, msg, hdr_list, flags);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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319
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320 fclose(out);
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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321
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322 waitpid(pid, &status, 0);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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323
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324 if (WEXITSTATUS(status) != 0) {
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325 int exstat = WEXITSTATUS(status);
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326 logwrite(LOG_ALERT, "process returned %d (%s)\n", exstat, ext_strerror(1024 + exstat));
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327 errno = 1024 + exstat;
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328 } else if (WIFSIGNALED(status)) {
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329 logwrite(LOG_ALERT, "process got signal %d\n", WTERMSIG(status));
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330 } else
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331 ok = TRUE;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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332
10
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333 } else
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334 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", cmd, strerror(errno));
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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335
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336 signal(SIGCHLD, old_signal);
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337
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338 /* free environment */
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339 for (i = 0; i < n; i++) {
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340 g_free(envp[i]);
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341 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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342
10
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343 /* set uid and gid back */
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344 if (!conf.run_as_user) {
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345 set_euidgid(saved_uid, saved_gid, NULL, NULL);
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346 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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347
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348 return ok;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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349 }