masqmail

annotate src/header.c @ 331:e507c854a63e

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Security fix! Correct handling of seteuid() return value See Debian bug #638002, reported by John Lightsey. When possible the (already available) set_euidgid() function is used. Additionally, it is unnecessary to change the identity when writing into an already open file descriptor. This should fix the problem.
author markus schnalke <meillo@marmaro.de>
date Sat, 27 Aug 2011 16:19:07 +0200
parents 3e3c280ca5b2
children 41958685480d
rev   line source
meillo@0 1 /* MasqMail
meillo@0 2 Copyright (C) 2000 Oliver Kurth
meillo@0 3
meillo@0 4 This program is free software; you can redistribute it and/or modify
meillo@0 5 it under the terms of the GNU General Public License as published by
meillo@0 6 the Free Software Foundation; either version 2 of the License, or
meillo@0 7 (at your option) any later version.
meillo@0 8
meillo@0 9 This program is distributed in the hope that it will be useful,
meillo@0 10 but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 12 GNU General Public License for more details.
meillo@0 13
meillo@0 14 You should have received a copy of the GNU General Public License
meillo@0 15 along with this program; if not, write to the Free Software
meillo@0 16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 17 */
meillo@0 18 #include "masqmail.h"
meillo@0 19
meillo@10 20 header_name header_names[] = {
meillo@15 21 {"From", HEAD_FROM,},
meillo@15 22 {"Sender", HEAD_SENDER,},
meillo@15 23 {"To", HEAD_TO,},
meillo@15 24 {"Cc", HEAD_CC,},
meillo@15 25 {"Bcc", HEAD_BCC,},
meillo@15 26 {"Date", HEAD_DATE,},
meillo@15 27 {"Message-Id", HEAD_MESSAGE_ID,},
meillo@15 28 {"Reply-To", HEAD_REPLY_TO,},
meillo@15 29 {"Subject", HEAD_SUBJECT,},
meillo@15 30 {"Return-Path", HEAD_RETURN_PATH,},
meillo@15 31 {"Envelope-To", HEAD_ENVELOPE_TO,},
meillo@15 32 {"Received", HEAD_RECEIVED},
meillo@0 33 };
meillo@0 34
meillo@0 35 /* this was borrowed from exim and slightly changed */
meillo@10 36 gchar*
meillo@10 37 rec_timestamp()
meillo@0 38 {
meillo@10 39 static gchar buf[64];
meillo@10 40 int len;
meillo@0 41
meillo@10 42 time_t now = time(NULL);
meillo@10 43 struct tm *t = localtime(&now);
meillo@0 44
meillo@10 45 int diff_hour, diff_min;
meillo@10 46 struct tm local;
meillo@10 47 struct tm *gmt;
meillo@0 48
meillo@10 49 memcpy(&local, t, sizeof(struct tm));
meillo@10 50 gmt = gmtime(&now);
meillo@10 51 diff_min = 60 * (local.tm_hour - gmt->tm_hour) + local.tm_min - gmt->tm_min;
meillo@301 52 if (local.tm_year != gmt->tm_year) {
meillo@10 53 diff_min += (local.tm_year > gmt->tm_year) ? 1440 : -1440;
meillo@301 54 } else if (local.tm_yday != gmt->tm_yday) {
meillo@10 55 diff_min += (local.tm_yday > gmt->tm_yday) ? 1440 : -1440;
meillo@301 56 }
meillo@10 57 diff_hour = diff_min / 60;
meillo@10 58 diff_min = abs(diff_min - diff_hour * 60);
meillo@0 59
meillo@10 60 len = strftime(buf, sizeof(buf), "%a, ", &local);
meillo@10 61 g_snprintf(buf + len, sizeof(buf) - len, "%02d ", local.tm_mday);
meillo@10 62 len += strlen(buf + len);
meillo@10 63 len += strftime(buf + len, sizeof(buf) - len, "%b %Y %H:%M:%S", &local);
meillo@10 64 g_snprintf(buf + len, sizeof(buf) - len, " %+03d%02d", diff_hour, diff_min);
meillo@10 65
meillo@10 66 return buf;
meillo@0 67 }
meillo@0 68
meillo@0 69 /* finds list of headers matching id
meillo@0 70 if id == HEAD_UNKNOWN and header == NULL finds all unknown headers
meillo@0 71 else finds all headers matching header
meillo@0 72 */
meillo@10 73 GList*
meillo@10 74 find_header(GList * hdr_list, header_id id, gchar * hdr_str)
meillo@0 75 {
meillo@10 76 GList *found_list = NULL;
meillo@10 77 GList *node;
meillo@0 78
meillo@301 79 if ((id != HEAD_UNKNOWN) || !hdr_str) {
meillo@10 80 foreach(hdr_list, node) {
meillo@10 81 header *hdr = (header *) (node->data);
meillo@301 82 if (hdr->id == id) {
meillo@10 83 found_list = g_list_append(found_list, hdr);
meillo@301 84 }
meillo@10 85 }
meillo@301 86 return found_list;
meillo@301 87 }
meillo@10 88
meillo@301 89 foreach(hdr_list, node) {
meillo@301 90 header *hdr = (header *) (node->data);
meillo@301 91 gchar buf[64], *q = buf, *p = hdr->header;
meillo@10 92
meillo@301 93 while (*p != ':' && q < buf+sizeof(buf)-1 && *p) {
meillo@301 94 *(q++) = *(p++);
meillo@301 95 }
meillo@301 96 *q = '\0';
meillo@301 97
meillo@301 98 if (strcasecmp(buf, hdr_str) == 0) {
meillo@301 99 found_list = g_list_append(found_list, hdr);
meillo@10 100 }
meillo@10 101 }
meillo@10 102 return found_list;
meillo@0 103 }
meillo@0 104
meillo@10 105 void
meillo@10 106 header_unfold(header * hdr)
meillo@0 107 {
meillo@302 108 char *src = hdr->header;
meillo@302 109 char *dest = src;
meillo@302 110 char *p;
meillo@0 111
meillo@302 112 p = strchr(src, '\n');
meillo@302 113 if (!p || !p[1]) {
meillo@302 114 /* no folded header */
meillo@302 115 return;
meillo@302 116 }
meillo@0 117
meillo@302 118 while (*src) {
meillo@302 119 if (*src == '\n') {
meillo@302 120 /* ignore */
meillo@302 121 src++;
meillo@302 122 } else {
meillo@302 123 /* copy */
meillo@302 124 *(dest++) = *(src++);
meillo@302 125 }
meillo@302 126 }
meillo@302 127 *(dest++) = '\n';
meillo@302 128 *(dest++) = '\0';
meillo@0 129 }
meillo@0 130
meillo@303 131 /*
meillo@303 132 fold the header at maxlen chars (newline excluded)
meillo@303 133 (We exclude the newline because the RFCs deal with it this way)
meillo@303 134 */
meillo@10 135 void
meillo@303 136 header_fold(header* hdr, unsigned int maxlen)
meillo@0 137 {
meillo@303 138 int len = strlen(hdr->header);
meillo@303 139 char* src = hdr->header;
meillo@303 140 char* dest;
meillo@303 141 char* tmp;
meillo@303 142 char* p;
meillo@301 143 int valueoffset;
meillo@301 144
meillo@303 145 if (len <= maxlen) {
meillo@301 146 /* we don't need to do anything */
meillo@301 147 return;
meillo@301 148 }
meillo@301 149
meillo@303 150 /* strip trailing whitespace */
meillo@303 151 for (p=src+len-1; *p==' '||*p=='\t'||*p=='\n'; p--) {
meillo@303 152 *p = '\0';
meillo@303 153 len--;
meillo@303 154 printf(" trailing whitespace\n");
meillo@303 155 }
meillo@303 156 printf("stripped len: %d\n", len);
meillo@303 157
meillo@303 158 /* FIXME: would be nice to have a better size calculation */
meillo@303 159 /* (the current size + what we insert as break, twice as often as
meillo@303 160 we have breaks in the optimal case) */
meillo@303 161 tmp = malloc(len + 2 * (len/maxlen) * strlen("\n\t"));
meillo@303 162 dest = tmp;
meillo@303 163
meillo@303 164 /* the position in hdr->header where the value part start */
meillo@301 165 valueoffset = hdr->value - hdr->header;
meillo@301 166
meillo@303 167 while (strlen(src) > maxlen) {
meillo@303 168 int i, l;
meillo@303 169 char *pp;
meillo@0 170
meillo@303 171 for (pp=src+maxlen; pp>src; pp--) {
meillo@303 172 if (*pp==' ' || *pp=='\t' || *p=='\n') {
meillo@303 173 break;
meillo@303 174 }
meillo@303 175 }
meillo@303 176
meillo@303 177 if (src == pp) {
meillo@303 178 /* no potential break point was found within
meillo@303 179 maxlen so advance further until the next */
meillo@303 180 for (pp=src+maxlen; *pp; pp++) {
meillo@303 181 if (*pp==' ' || *pp=='\t' || *p=='\n') {
meillo@303 182 break;
meillo@303 183 }
meillo@303 184 }
meillo@303 185 }
meillo@303 186 if (!*pp) {
meillo@303 187 break;
meillo@303 188 }
meillo@0 189
meillo@303 190 memcpy(dest, src, pp-src);
meillo@303 191 dest += pp-src;
meillo@303 192 *(dest++) = '\n';
meillo@303 193 *(dest++) = '\t';
meillo@303 194 while (*pp == ' ' || *pp == '\t' || *p=='\n') {
meillo@303 195 pp++;
meillo@303 196 }
meillo@303 197 src = pp;
meillo@303 198 }
meillo@303 199 memcpy(dest, src, strlen(src));
meillo@303 200 dest += strlen(src);
meillo@303 201
meillo@303 202 if (*(dest-1) != '\n') {
meillo@303 203 *dest = '\n';
meillo@303 204 *(dest+1) = '\0';
meillo@301 205 }
meillo@0 206
meillo@303 207 hdr->header = tmp;
meillo@301 208 hdr->value = hdr->header + valueoffset;
meillo@0 209 }
meillo@0 210
meillo@10 211 header*
meillo@10 212 create_header(header_id id, gchar * fmt, ...)
meillo@0 213 {
meillo@10 214 gchar *p;
meillo@10 215 header *hdr;
meillo@10 216 va_list args;
meillo@10 217 va_start(args, fmt);
meillo@0 218
meillo@301 219 /* g_malloc() calls exit on failure */
meillo@301 220 hdr = g_malloc(sizeof(header));
meillo@0 221
meillo@301 222 hdr->id = id;
meillo@301 223 hdr->header = g_strdup_vprintf(fmt, args);
meillo@301 224 hdr->value = NULL;
meillo@0 225
meillo@301 226 /* value shall point to the first non-whitespace char in the
meillo@301 227 value part of the header line (i.e. after the first colon) */
meillo@301 228 p = strchr(hdr->header, ':');
meillo@301 229 if (p) {
meillo@301 230 p++;
meillo@301 231 while (*p == ' ' || *p == '\t' || *p == '\n') {
meillo@10 232 p++;
meillo@301 233 }
meillo@301 234 hdr->value = (*p) ? p : NULL;
meillo@10 235 }
meillo@0 236
meillo@301 237 DEBUG(3) debugf("create_header(): hdr: `%s'\n", hdr->header);
meillo@301 238 DEBUG(3) debugf("create_header(): val: `%s'\n", hdr->value);
meillo@301 239
meillo@10 240 va_end(args);
meillo@10 241 return hdr;
meillo@0 242 }
meillo@0 243
meillo@10 244 void
meillo@10 245 destroy_header(header * hdr)
meillo@0 246 {
meillo@10 247 if (hdr) {
meillo@301 248 if (hdr->header) {
meillo@10 249 g_free(hdr->header);
meillo@301 250 }
meillo@10 251 g_free(hdr);
meillo@10 252 }
meillo@0 253 }
meillo@0 254
meillo@10 255 header*
meillo@10 256 copy_header(header * hdr)
meillo@0 257 {
meillo@10 258 header *new_hdr = NULL;
meillo@0 259
meillo@10 260 if (hdr) {
meillo@301 261 new_hdr = g_malloc(sizeof(header));
meillo@301 262 new_hdr->id = hdr->id;
meillo@301 263 new_hdr->header = g_strdup(hdr->header);
meillo@301 264 new_hdr->value = new_hdr->header + (hdr->value - hdr->header);
meillo@10 265 }
meillo@10 266 return new_hdr;
meillo@0 267 }
meillo@0 268
meillo@10 269 header*
meillo@10 270 get_header(gchar * line)
meillo@0 271 {
meillo@10 272 gchar *p = line;
meillo@10 273 gchar buf[64], *q = buf;
meillo@10 274 gint i;
meillo@10 275 header *hdr;
meillo@0 276
meillo@301 277 while (*p && (*p != ':') && (q < buf+sizeof(buf)-1)) {
meillo@10 278 *(q++) = *(p++);
meillo@301 279 }
meillo@15 280 *q = '\0';
meillo@0 281
meillo@301 282 if (*p != ':') {
meillo@10 283 return NULL;
meillo@301 284 }
meillo@0 285
meillo@10 286 hdr = g_malloc(sizeof(header));
meillo@0 287
meillo@10 288 hdr->value = NULL;
meillo@10 289 p++;
meillo@0 290
meillo@301 291 while (*p && (*p == ' ' || *p == '\t')) {
meillo@10 292 p++;
meillo@301 293 }
meillo@10 294 hdr->value = p;
meillo@301 295 /* Note: an empty value can also mean that it's only the first part
meillo@301 296 of a folded header line */
meillo@0 297
meillo@10 298 for (i = 0; i < HEAD_NUM_IDS; i++) {
meillo@301 299 if (strcasecmp(header_names[i].header, buf) == 0) {
meillo@10 300 break;
meillo@301 301 }
meillo@10 302 }
meillo@10 303 hdr->id = (header_id) i;
meillo@10 304 hdr->header = g_strdup(line);
meillo@10 305 hdr->value = hdr->header + (hdr->value - line);
meillo@10 306
meillo@322 307 DEBUG(4) debugf("header: %d = %s[...]", hdr->id, hdr->header);
meillo@301 308 /* Note: This only outputs the first line if the header is folded */
meillo@10 309
meillo@10 310 return hdr;
meillo@0 311 }