Mercurial > dovecot > core-2.2
annotate src/lda/main.c @ 9159:6324a79d3ee1 HEAD
Initial commit for v2.0 master rewrite. Several features are still missing.
author | Timo Sirainen <tss@iki.fi> |
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date | Thu, 23 Apr 2009 19:53:44 -0400 |
parents | bf448752f6c4 |
children | 5d0a69504867 |
rev | line source |
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9092
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1 /* Copyright (c) 2005-2009 Dovecot authors, see the included COPYING file */ |
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2 |
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3 #include "lib.h" |
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4 #include "lib-signals.h" |
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5 #include "env-util.h" |
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6 #include "fd-set-nonblock.h" |
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7 #include "istream.h" |
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8 #include "istream-seekable.h" |
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9 #include "str.h" |
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10 #include "str-sanitize.h" |
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11 #include "strescape.h" |
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12 #include "rfc822-parser.h" |
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13 #include "message-address.h" |
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14 #include "imap-utf7.h" |
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15 #include "settings-parser.h" |
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16 #include "master-service.h" |
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17 #include "master-service-settings.h" |
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18 #include "mail-storage-service.h" |
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19 #include "mail-namespace.h" |
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20 #include "raw-storage.h" |
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21 #include "mail-deliver.h" |
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22 #include "mail-send.h" |
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23 #include "duplicate.h" |
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24 #include "mbox-from.h" |
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25 #include "lda-settings.h" |
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26 |
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27 #include <stdio.h> |
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28 #include <stdlib.h> |
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29 #include <pwd.h> |
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30 #include <sysexits.h> |
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31 |
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32 #ifndef EX_CONFIG |
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33 # define EX_CONFIG 78 /* for HP-UX */ |
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34 #endif |
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35 |
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36 #define DEFAULT_ENVELOPE_SENDER "MAILER-DAEMON" |
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37 |
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38 /* After buffer grows larger than this, create a temporary file to /tmp |
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39 where to read the mail. */ |
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40 #define MAIL_MAX_MEMORY_BUFFER (1024*128) |
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41 |
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42 static const char *wanted_headers[] = { |
9117 | 43 "From", "To", "Message-ID", "Subject", "Return-Path", |
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44 NULL |
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45 }; |
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46 |
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47 static struct master_service *service; |
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48 |
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49 static const char *escape_local_part(const char *local_part) |
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50 { |
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51 const char *p; |
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52 |
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53 /* if there are non-atext chars, we need to return quoted-string */ |
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54 for (p = local_part; *p != '\0'; p++) { |
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55 if (!IS_ATEXT(*p)) { |
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56 return t_strdup_printf("\"%s\"", |
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57 str_escape(local_part)); |
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58 } |
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59 } |
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60 return local_part; |
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61 } |
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62 |
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63 static const char *address_sanitize(const char *address) |
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64 { |
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65 struct message_address *addr; |
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66 const char *ret, *mailbox; |
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67 pool_t pool; |
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68 |
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69 pool = pool_alloconly_create("address sanitizer", 256); |
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70 addr = message_address_parse(pool, (const unsigned char *)address, |
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71 strlen(address), 1, FALSE); |
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72 |
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73 if (addr == NULL || addr->mailbox == NULL || addr->domain == NULL || |
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74 *addr->mailbox == '\0') |
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75 ret = DEFAULT_ENVELOPE_SENDER; |
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76 else { |
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77 mailbox = escape_local_part(addr->mailbox); |
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78 if (*addr->domain == '\0') |
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79 ret = t_strdup(mailbox); |
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80 else |
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81 ret = t_strdup_printf("%s@%s", mailbox, addr->domain); |
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82 } |
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83 pool_unref(&pool); |
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84 return ret; |
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85 } |
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86 |
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87 |
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88 static struct istream * |
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89 create_raw_stream(struct mail_deliver_context *ctx, |
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90 const char *temp_path_prefix, int fd, time_t *mtime_r) |
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91 { |
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92 struct istream *input, *input2, *input_list[2]; |
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93 const unsigned char *data; |
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94 char *sender = NULL; |
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95 size_t i, size; |
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96 int ret, tz; |
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97 |
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98 *mtime_r = (time_t)-1; |
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99 fd_set_nonblock(fd, FALSE); |
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100 |
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101 input = i_stream_create_fd(fd, 4096, FALSE); |
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102 input->blocking = TRUE; |
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103 /* If input begins with a From-line, drop it */ |
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104 ret = i_stream_read_data(input, &data, &size, 5); |
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105 if (ret > 0 && size >= 5 && memcmp(data, "From ", 5) == 0) { |
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106 /* skip until the first LF */ |
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107 i_stream_skip(input, 5); |
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108 while ((ret = i_stream_read_data(input, &data, &size, 0)) > 0) { |
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109 for (i = 0; i < size; i++) { |
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110 if (data[i] == '\n') |
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111 break; |
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112 } |
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113 if (i != size) { |
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114 (void)mbox_from_parse(data, i, mtime_r, &tz, |
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115 &sender); |
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116 i_stream_skip(input, i + 1); |
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117 break; |
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118 } |
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119 i_stream_skip(input, size); |
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120 } |
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121 } |
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122 |
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123 if (sender != NULL && ctx->src_envelope_sender == NULL) { |
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124 /* use the envelope sender from From_-line, but only if it |
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125 hasn't been specified with -f already. */ |
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126 ctx->src_envelope_sender = p_strdup(ctx->pool, sender); |
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127 } |
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128 i_free(sender); |
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129 |
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130 if (input->v_offset == 0) { |
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131 input2 = input; |
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132 i_stream_ref(input2); |
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133 } else { |
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134 input2 = i_stream_create_limit(input, (uoff_t)-1); |
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135 } |
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136 i_stream_unref(&input); |
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137 |
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138 input_list[0] = input2; input_list[1] = NULL; |
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139 input = i_stream_create_seekable(input_list, MAIL_MAX_MEMORY_BUFFER, |
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140 temp_path_prefix); |
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141 i_stream_unref(&input2); |
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142 return input; |
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143 } |
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144 |
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145 static void failure_exit_callback(int *status) |
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146 { |
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147 /* we want all our exit codes to be sysexits.h compatible. |
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148 if we failed because of a logging related error, we most likely |
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149 aren't writing to stderr, so try writing there to give some kind of |
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150 a clue what's wrong. FATAL_LOGOPEN failure already wrote to |
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151 stderr, so don't duplicate it. */ |
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152 switch (*status) { |
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153 case FATAL_LOGWRITE: |
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154 fputs("Failed to write to log file", stderr); |
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155 break; |
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156 case FATAL_LOGERROR: |
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157 fputs("Internal logging error", stderr); |
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158 break; |
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159 case FATAL_LOGOPEN: |
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160 case FATAL_OUTOFMEM: |
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161 case FATAL_EXEC: |
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162 case FATAL_DEFAULT: |
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163 break; |
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164 default: |
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165 return; |
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166 } |
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167 *status = EX_TEMPFAIL; |
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168 } |
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169 |
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170 static void print_help(void) |
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171 { |
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172 printf( |
9103 | 173 "Usage: dovecot-lda [-c <config file>] [-a <address>] [-d <username>] [-p <path>]\n" |
174 " [-f <envelope sender>] [-m <mailbox>] [-e] [-k]\n"); | |
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175 } |
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176 |
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177 int main(int argc, char *argv[]) |
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178 { |
9106
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179 const struct setting_parser_info *set_roots[] = { |
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180 &lda_setting_parser_info, |
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181 NULL |
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182 }; |
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183 struct mail_deliver_context ctx; |
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184 enum mail_storage_service_flags service_flags = 0; |
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185 const char *user, *errstr, *path, *getopt_str; |
9147
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186 struct mail_storage_service_input service_input; |
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187 struct mail_user *raw_mail_user; |
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188 struct mail_namespace *raw_ns; |
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189 struct mail_namespace_settings raw_ns_set; |
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190 struct mail_storage *storage; |
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191 struct mailbox *box; |
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192 struct raw_mailbox *raw_box; |
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193 struct istream *input; |
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194 struct mailbox_transaction_context *t; |
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195 struct mailbox_header_lookup_ctx *headers_ctx; |
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196 char cwd[PATH_MAX]; |
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197 void **sets; |
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198 uid_t process_euid; |
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199 bool stderr_rejection = FALSE; |
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200 time_t mtime; |
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201 int ret, c; |
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202 string_t *str; |
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203 enum mail_error error; |
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204 |
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205 if (getuid() != geteuid() && geteuid() == 0) { |
9103 | 206 /* running setuid - don't allow this if the binary is |
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207 executable by anyone */ |
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208 struct stat st; |
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209 |
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210 if (stat(argv[0], &st) < 0) { |
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211 fprintf(stderr, "stat(%s) failed: %s\n", |
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212 argv[0], strerror(errno)); |
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213 return EX_CONFIG; |
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214 } else if ((st.st_mode & 1) != 0) { |
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215 fprintf(stderr, "%s must not be both world-executable " |
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216 "and setuid-root. This allows root exploits. " |
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217 "See http://wiki.dovecot.org/LDA#multipleuids\n", |
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218 argv[0]); |
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219 return EX_CONFIG; |
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220 } |
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221 } |
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222 |
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223 i_set_failure_exit_callback(failure_exit_callback); |
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224 |
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225 service = master_service_init("lda", MASTER_SERVICE_FLAG_STANDALONE, |
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226 argc, argv); |
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227 |
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228 memset(&ctx, 0, sizeof(ctx)); |
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229 ctx.pool = pool_alloconly_create("mail deliver context", 256); |
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230 ctx.dest_mailbox_name = "INBOX"; |
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231 path = NULL; |
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232 |
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233 user = getenv("USER"); |
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234 getopt_str = t_strconcat("a:d:p:ekm:nsf:", |
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235 master_service_getopt_string(), NULL); |
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236 while ((c = getopt(argc, argv, getopt_str)) > 0) { |
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237 switch (c) { |
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238 case 'a': |
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239 /* destination address */ |
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240 ctx.dest_addr = optarg; |
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241 break; |
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242 case 'd': |
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243 /* destination user */ |
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244 user = optarg; |
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245 service_flags |= MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP; |
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246 break; |
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247 case 'p': |
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248 /* input path */ |
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249 path = optarg; |
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250 if (*path != '/') { |
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251 /* expand relative paths before we chdir */ |
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252 if (getcwd(cwd, sizeof(cwd)) == NULL) |
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253 i_fatal("getcwd() failed: %m"); |
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254 path = t_strconcat(cwd, "/", path, NULL); |
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255 } |
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256 break; |
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257 case 'e': |
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258 stderr_rejection = TRUE; |
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259 break; |
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260 case 'm': |
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261 /* destination mailbox. |
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262 Ignore -m "". This allows doing -m ${extension} |
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263 in Postfix to handle user+mailbox */ |
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264 if (*optarg != '\0') T_BEGIN { |
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265 str = t_str_new(256); |
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266 if (imap_utf8_to_utf7(optarg, str) < 0) { |
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267 i_fatal("Mailbox name not UTF-8: %s", |
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268 optarg); |
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269 } |
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270 ctx.dest_mailbox_name = |
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271 p_strdup(ctx.pool, str_c(str)); |
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272 } T_END; |
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273 break; |
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274 case 'f': |
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275 /* envelope sender address */ |
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276 ctx.src_envelope_sender = |
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277 p_strdup(ctx.pool, address_sanitize(optarg)); |
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278 break; |
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279 default: |
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280 if (!master_service_parse_option(service, c, optarg)) { |
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281 print_help(); |
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282 exit(EX_USAGE); |
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283 } |
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284 break; |
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285 } |
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286 } |
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287 if (optind != argc) { |
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288 print_help(); |
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289 i_fatal_status(EX_USAGE, "Unknown argument: %s", argv[optind]); |
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290 } |
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291 |
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292 process_euid = geteuid(); |
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293 if ((service_flags & MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP) != 0) |
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294 ; |
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295 else if (process_euid != 0) { |
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296 /* we're non-root. get our username and possibly our home. */ |
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297 struct passwd *pw; |
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298 const char *home; |
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299 |
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300 home = getenv("HOME"); |
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301 if (user != NULL && home != NULL) { |
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302 /* no need for a pw lookup */ |
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303 } else if ((pw = getpwuid(process_euid)) != NULL) { |
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304 user = t_strdup(pw->pw_name); |
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305 if (home == NULL) |
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306 env_put(t_strconcat("HOME=", pw->pw_dir, NULL)); |
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307 } else if (user == NULL) { |
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308 i_fatal_status(EX_USAGE, |
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309 "Couldn't lookup our username (uid=%s)", |
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310 dec2str(process_euid)); |
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311 } |
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312 } else { |
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313 i_fatal_status(EX_USAGE, |
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314 "destination user parameter (-d user) not given"); |
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315 } |
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316 |
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317 memset(&service_input, 0, sizeof(service_input)); |
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318 service_input.username = user; |
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319 |
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320 service_flags |= MAIL_STORAGE_SERVICE_FLAG_DISALLOW_ROOT; |
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321 ctx.dest_user = mail_storage_service_init_user(service, &service_input, |
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322 set_roots, |
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323 service_flags); |
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324 #ifdef SIGXFSZ |
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325 lib_signals_ignore(SIGXFSZ, TRUE); |
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326 #endif |
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327 ctx.set = mail_storage_service_get_settings(service); |
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328 duplicate_init(mail_user_set_get_storage_set(ctx.dest_user->set)); |
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329 |
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330 /* create a separate mail user for the internal namespace */ |
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331 if (master_service_set(service, "mail_full_filesystem_access=yes") < 0) |
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332 i_unreached(); |
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333 sets = master_service_settings_get_others(service); |
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334 raw_mail_user = mail_user_alloc(user, sets[0]); |
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335 mail_user_set_home(raw_mail_user, "/"); |
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336 if (mail_user_init(raw_mail_user, &errstr) < 0) |
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337 i_fatal("Raw user initialization failed: %s", errstr); |
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338 |
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339 memset(&raw_ns_set, 0, sizeof(raw_ns_set)); |
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340 raw_ns_set.location = "/tmp"; |
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341 |
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342 raw_ns = mail_namespaces_init_empty(raw_mail_user); |
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343 raw_ns->flags |= NAMESPACE_FLAG_INTERNAL; |
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344 raw_ns->set = &raw_ns_set; |
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345 if (mail_storage_create(raw_ns, "raw", 0, &errstr) < 0) |
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346 i_fatal("Couldn't create internal raw storage: %s", errstr); |
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347 if (path == NULL) { |
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348 const char *prefix = mail_user_get_temp_prefix(ctx.dest_user); |
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349 input = create_raw_stream(&ctx, prefix, 0, &mtime); |
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350 box = mailbox_open(&raw_ns->storage, "Dovecot Delivery Mail", |
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351 input, MAILBOX_OPEN_NO_INDEX_FILES); |
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352 i_stream_unref(&input); |
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353 } else { |
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354 mtime = (time_t)-1; |
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355 box = mailbox_open(&raw_ns->storage, path, NULL, |
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356 MAILBOX_OPEN_NO_INDEX_FILES); |
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357 } |
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358 if (box == NULL) { |
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359 i_fatal("Can't open delivery mail as raw: %s", |
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360 mail_storage_get_last_error(raw_ns->storage, &error)); |
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361 } |
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362 if (mailbox_sync(box, 0, 0, NULL) < 0) { |
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363 i_fatal("Can't sync delivery mail: %s", |
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364 mail_storage_get_last_error(raw_ns->storage, &error)); |
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365 } |
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366 raw_box = (struct raw_mailbox *)box; |
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367 raw_box->envelope_sender = ctx.src_envelope_sender != NULL ? |
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368 ctx.src_envelope_sender : DEFAULT_ENVELOPE_SENDER; |
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369 raw_box->mtime = mtime; |
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370 |
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371 t = mailbox_transaction_begin(box, 0); |
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372 headers_ctx = mailbox_header_lookup_init(box, wanted_headers); |
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373 ctx.src_mail = mail_alloc(t, 0, headers_ctx); |
9117 | 374 mailbox_header_lookup_unref(&headers_ctx); |
9092
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375 mail_set_seq(ctx.src_mail, 1); |
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376 |
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377 if (ctx.dest_addr == NULL) { |
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378 ctx.dest_addr = mail_deliver_get_address(&ctx, "Envelope-To"); |
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379 if (ctx.dest_addr == NULL) { |
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380 ctx.dest_addr = strchr(user, '@') != NULL ? user : |
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381 t_strconcat(user, "@", ctx.set->hostname, NULL); |
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382 } |
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383 } |
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|
384 |
9117 | 385 if (mail_deliver(&ctx, &storage) < 0) { |
9092
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386 if (storage == NULL) { |
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387 /* This shouldn't happen */ |
9117 | 388 i_error("BUG: Saving failed to unknown storage"); |
9092
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389 return EX_TEMPFAIL; |
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390 } |
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391 |
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|
392 errstr = mail_storage_get_last_error(storage, &error); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
393 |
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|
394 if (stderr_rejection) { |
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|
395 /* write to stderr also for tempfails so that MTA |
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|
396 can log the reason if it wants to. */ |
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|
397 fprintf(stderr, "%s\n", errstr); |
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|
398 } |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
399 |
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|
400 if (error != MAIL_ERROR_NOSPACE || |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
401 ctx.set->quota_full_tempfail) { |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
402 /* Saving to INBOX should always work unless |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
403 we're over quota. If it didn't, it's probably a |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
diff
changeset
|
404 configuration problem. */ |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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diff
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|
405 return EX_TEMPFAIL; |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
406 } |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
407 |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
408 /* we'll have to reply with permanent failure */ |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
409 mail_deliver_log(&ctx, "rejected: %s", |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
410 str_sanitize(errstr, 512)); |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
411 |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
412 if (stderr_rejection) |
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|
413 return EX_NOPERM; |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
414 ret = mail_send_rejection(&ctx, user, errstr); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
415 if (ret != 0) |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
416 return ret < 0 ? EX_TEMPFAIL : ret; |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
diff
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|
417 /* ok, rejection sent */ |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
418 } |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
419 |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
420 mail_free(&ctx.src_mail); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
421 mailbox_transaction_rollback(&t); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
422 mailbox_close(&box); |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
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|
423 |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
424 mail_user_unref(&ctx.dest_user); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
diff
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|
425 mail_user_unref(&raw_mail_user); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
Timo Sirainen <tss@iki.fi>
parents:
diff
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|
426 duplicate_deinit(); |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
Timo Sirainen <tss@iki.fi>
parents:
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|
427 pool_unref(&ctx.pool); |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
diff
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|
428 |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
diff
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|
429 mail_storage_service_deinit_user(); |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
Timo Sirainen <tss@iki.fi>
parents:
diff
changeset
|
430 master_service_deinit(&service); |
e4832f128738
Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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parents:
diff
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|
431 return EX_OK; |
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Renamed deliver to dovecot-lda and moved most of its code to lib-lda.
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|
432 } |