| 1 |
#include <stdio.h> |
| 2 |
#include <unistd.h> |
| 3 |
#include <stdlib.h> |
| 4 |
#include <ctype.h> |
| 5 |
#include <errno.h> |
| 6 |
#include <string.h> |
| 7 |
#include <sys/time.h> |
| 8 |
#include <sys/types.h> |
| 9 |
#include <regex.h> |
| 10 |
#include <setjmp.h> |
| 11 |
|
| 12 |
#include "config.h" |
| 13 |
#include "imapfilter.h" |
| 14 |
|
| 15 |
|
| 16 |
extern int sockpri; |
| 17 |
extern unsigned int capabilities; |
| 18 |
extern char authmech[AUTH_MECH_LEN]; |
| 19 |
extern jmp_buf acctloop; |
| 20 |
|
| 21 |
static char *vbuf = NULL; /* Virtual buffer. */ |
| 22 |
static size_t vbufs = 0; /* Virtual buffer size. */ |
| 23 |
|
| 24 |
|
| 25 |
/* |
| 26 |
* Read one packet of data that the server sent. |
| 27 |
*/ |
| 28 |
void receive_response(int *sock, char *buf) |
| 29 |
{ |
| 30 |
if (socket_read(sock, buf) == ERROR_NETWORK) |
| 31 |
longjmp(acctloop, -1); |
| 32 |
|
| 33 |
#ifdef DEBUG |
| 34 |
fprintf(stderr, "\n%s\n", buf); |
| 35 |
#endif |
| 36 |
|
| 37 |
} |
| 38 |
|
| 39 |
|
| 40 |
/* |
| 41 |
* Get server response to client's request. |
| 42 |
*/ |
| 43 |
int server_response(int *sock, unsigned int tag) |
| 44 |
{ |
| 45 |
char buf[RESPONSE_BUF]; |
| 46 |
|
| 47 |
reset_vbuf(); |
| 48 |
|
| 49 |
do { |
| 50 |
receive_response(sock, buf); |
| 51 |
bye_response(buf); |
| 52 |
check_vbuf(strlen(buf)); |
| 53 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 54 |
} while (tag && !strcasestr(buf, ultostr(tag, 16))); |
| 55 |
|
| 56 |
return analyze_response(buf); |
| 57 |
} |
| 58 |
|
| 59 |
|
| 60 |
/* |
| 61 |
* Check if server sent a BYE response (connection is closed immediately). |
| 62 |
*/ |
| 63 |
void bye_response(char *buf) |
| 64 |
{ |
| 65 |
if (strcasestr(buf, "* BYE")) |
| 66 |
longjmp(acctloop, -1); |
| 67 |
} |
| 68 |
|
| 69 |
|
| 70 |
/* |
| 71 |
* Process the greeting that server sends during connection. |
| 72 |
*/ |
| 73 |
int greeting_response(int *sock) |
| 74 |
{ |
| 75 |
char buf[RESPONSE_BUF]; |
| 76 |
|
| 77 |
receive_response(sock, buf); |
| 78 |
bye_response(buf); |
| 79 |
|
| 80 |
if (strcasestr(buf, "* PREAUTH")) |
| 81 |
return RESPONSE_PREAUTH; |
| 82 |
|
| 83 |
return RESPONSE_OK; |
| 84 |
} |
| 85 |
|
| 86 |
|
| 87 |
/* |
| 88 |
* Process the data that server sent due to IMAP LOGOUT client request. |
| 89 |
*/ |
| 90 |
int logout_response(int *sock, unsigned int tag) |
| 91 |
{ |
| 92 |
char buf[RESPONSE_BUF]; |
| 93 |
|
| 94 |
reset_vbuf(); |
| 95 |
|
| 96 |
do { |
| 97 |
receive_response(sock, buf); |
| 98 |
check_vbuf(strlen(buf)); |
| 99 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 100 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 101 |
|
| 102 |
return analyze_response(buf); |
| 103 |
} |
| 104 |
|
| 105 |
|
| 106 |
/* |
| 107 |
* Process the data that server sent due to IMAP CAPABILITY client request. |
| 108 |
*/ |
| 109 |
int capability_response(int *sock, unsigned int tag) |
| 110 |
{ |
| 111 |
char buf[RESPONSE_BUF]; |
| 112 |
|
| 113 |
reset_vbuf(); |
| 114 |
|
| 115 |
do { |
| 116 |
receive_response(sock, buf); |
| 117 |
bye_response(buf); |
| 118 |
check_vbuf(strlen(buf)); |
| 119 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 120 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 121 |
|
| 122 |
if (!strcasestr(vbuf, "IMAP4rev1")) { |
| 123 |
error("imapfilter: server does not support IMAP4rev1 protocol\n"); |
| 124 |
return -2; |
| 125 |
} |
| 126 |
if (strcasestr(vbuf, "NAMESPACE")) |
| 127 |
capabilities |= CAPABILITY_NAMESPACE; |
| 128 |
|
| 129 |
auth_mechanisms(); |
| 130 |
|
| 131 |
return analyze_response(buf); |
| 132 |
} |
| 133 |
|
| 134 |
|
| 135 |
/* |
| 136 |
* Create the list of available authentication mechanisms. |
| 137 |
*/ |
| 138 |
void auth_mechanisms(void) |
| 139 |
{ |
| 140 |
int len; |
| 141 |
char *c, *cp, *tok; |
| 142 |
|
| 143 |
*authmech = 0; |
| 144 |
|
| 145 |
c = cp = xstrdup(vbuf); |
| 146 |
|
| 147 |
tok = strtok_r(c, " \r\n", &c); |
| 148 |
while(tok) { |
| 149 |
if (strcasestr(tok, "AUTH=")) { |
| 150 |
strncat(authmech, tok + 5, AUTH_MECH_LEN - strlen(authmech) - 2); |
| 151 |
len = strlen(authmech); |
| 152 |
*(authmech + len) = ' '; |
| 153 |
*(authmech + len + 1) = 0; |
| 154 |
} |
| 155 |
tok = strtok_r(NULL, " \r\n", &c); |
| 156 |
} |
| 157 |
if ((len = strlen(authmech))) |
| 158 |
*(authmech + strlen(authmech) - 1) = 0; |
| 159 |
|
| 160 |
xfree(cp); |
| 161 |
|
| 162 |
#ifdef DEBUG |
| 163 |
fprintf(stderr, "debug: authentication mechanisms: '%s'\n", authmech); |
| 164 |
#endif |
| 165 |
|
| 166 |
} |
| 167 |
|
| 168 |
|
| 169 |
/* |
| 170 |
* Process the data that server sent due to IMAP NAMESPACE client request. |
| 171 |
*/ |
| 172 |
int namespace_response(int *sock, unsigned int tag, namesp_t * nsp) |
| 173 |
{ |
| 174 |
char buf[RESPONSE_BUF]; |
| 175 |
char *c, *d; |
| 176 |
|
| 177 |
reset_vbuf(); |
| 178 |
|
| 179 |
do { |
| 180 |
receive_response(sock, buf); |
| 181 |
bye_response(buf); |
| 182 |
check_vbuf(strlen(buf)); |
| 183 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 184 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 185 |
|
| 186 |
if ((c = strcasestr(vbuf, "* NAMESPACE"))) { |
| 187 |
c += 12; |
| 188 |
if (strncasecmp(c, "NIL", 3)) { |
| 189 |
c = strchr(c, '"') + 1; |
| 190 |
d = strchr(c, '"') + 1; |
| 191 |
|
| 192 |
strncat(nsp->prefix, c, d - c - 1); |
| 193 |
nsp->delim = *(strchr(d, '"') + 1); |
| 194 |
} |
| 195 |
} |
| 196 |
#ifdef DEBUG |
| 197 |
fprintf(stderr, "debug: namespace: '%s' '%c'\n", nsp->prefix, nsp->delim); |
| 198 |
#endif |
| 199 |
return analyze_response(buf); |
| 200 |
} |
| 201 |
|
| 202 |
|
| 203 |
/* |
| 204 |
* Process the data that server sent due to IMAP STATUS client request. |
| 205 |
*/ |
| 206 |
int status_response(int *sock, unsigned int tag, char *mbox) |
| 207 |
{ |
| 208 |
int r; |
| 209 |
char buf[RESPONSE_BUF]; |
| 210 |
unsigned int exist, recent, unseen; |
| 211 |
char *c; |
| 212 |
|
| 213 |
exist = recent = unseen = 0; |
| 214 |
|
| 215 |
reset_vbuf(); |
| 216 |
|
| 217 |
do { |
| 218 |
receive_response(sock, buf); |
| 219 |
bye_response(buf); |
| 220 |
check_vbuf(strlen(buf)); |
| 221 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 222 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 223 |
|
| 224 |
r = analyze_response(buf); |
| 225 |
|
| 226 |
if (r == RESPONSE_NO) |
| 227 |
return -2; |
| 228 |
|
| 229 |
if ((c = strcasestr(vbuf, "MESSAGES"))) { |
| 230 |
c += 9; |
| 231 |
exist = strtoul(c, NULL, 10); |
| 232 |
} |
| 233 |
if ((c = strcasestr(vbuf, "RECENT"))) { |
| 234 |
c += 7; |
| 235 |
recent = strtoul(c, NULL, 10); |
| 236 |
} |
| 237 |
if ((c = strcasestr(vbuf, "UNSEEN"))) { |
| 238 |
c += 7; |
| 239 |
unseen = strtoul(c, NULL, 10); |
| 240 |
} |
| 241 |
if (!exist) { |
| 242 |
info("No messages in mailbox \"%s\".\n", mbox); |
| 243 |
return -2; |
| 244 |
} |
| 245 |
info("%d message%s, %d recent, %d unseen, in mailbox \"%s\".\n", exist, |
| 246 |
plural(exist), recent, unseen, mbox); |
| 247 |
|
| 248 |
return r; |
| 249 |
} |
| 250 |
|
| 251 |
|
| 252 |
/* |
| 253 |
* Process the data that server sent due to IMAP SELECT client request. |
| 254 |
*/ |
| 255 |
int select_response(int *sock, unsigned int tag) |
| 256 |
{ |
| 257 |
char buf[RESPONSE_BUF]; |
| 258 |
|
| 259 |
reset_vbuf(); |
| 260 |
|
| 261 |
do { |
| 262 |
receive_response(sock, buf); |
| 263 |
bye_response(buf); |
| 264 |
check_vbuf(strlen(buf)); |
| 265 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 266 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 267 |
|
| 268 |
if (strcasestr(vbuf, "[READ-ONLY]")) |
| 269 |
return RESPONSE_READONLY; |
| 270 |
|
| 271 |
return analyze_response(buf); |
| 272 |
} |
| 273 |
|
| 274 |
|
| 275 |
/* |
| 276 |
* Process the data that server sent due to IMAP SEARCH client request. |
| 277 |
*/ |
| 278 |
int search_response(int *sock, unsigned int tag, char **mesgs) |
| 279 |
{ |
| 280 |
char buf[RESPONSE_BUF]; |
| 281 |
char *c, *m; |
| 282 |
unsigned int blen; |
| 283 |
|
| 284 |
reset_vbuf(); |
| 285 |
|
| 286 |
do { |
| 287 |
receive_response(sock, buf); |
| 288 |
bye_response(buf); |
| 289 |
check_vbuf(strlen(buf)); |
| 290 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 291 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 292 |
|
| 293 |
if ((c = strcasestr(vbuf, "* SEARCH "))) { |
| 294 |
blen = strlen(vbuf); |
| 295 |
|
| 296 |
m = *mesgs = (char *)xmalloc(blen + 1); |
| 297 |
|
| 298 |
c += 9; |
| 299 |
|
| 300 |
while (*c && (isdigit((unsigned char)(*c)) || *c == ' ')) |
| 301 |
*(m++) = *(c++); |
| 302 |
|
| 303 |
*m = 0; |
| 304 |
} |
| 305 |
return analyze_response(buf); |
| 306 |
} |
| 307 |
|
| 308 |
|
| 309 |
/* |
| 310 |
* Process the data that server sent due to IMAP FETCH client request. |
| 311 |
*/ |
| 312 |
int fetch_response(int *sock, unsigned int tag, int reset, char *fetch) |
| 313 |
{ |
| 314 |
char buf[RESPONSE_BUF]; |
| 315 |
unsigned int i; |
| 316 |
static unsigned int s; |
| 317 |
char *b; |
| 318 |
|
| 319 |
if (reset) { |
| 320 |
s = 0; |
| 321 |
return 0; |
| 322 |
} |
| 323 |
i = 0; |
| 324 |
|
| 325 |
reset_vbuf(); |
| 326 |
|
| 327 |
do { |
| 328 |
receive_response(sock, buf); |
| 329 |
bye_response(buf); |
| 330 |
check_vbuf(strlen(buf)); |
| 331 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 332 |
} while (strlen(vbuf) < RESPONSE_BUF && |
| 333 |
!strcasestr(buf, ultostr(tag, 16))); |
| 334 |
|
| 335 |
b = vbuf; |
| 336 |
|
| 337 |
if (!s) { |
| 338 |
if ((b = strstr(b, "}\r\n"))) { |
| 339 |
while (b - vbuf > 0) |
| 340 |
if (*--b == '{') |
| 341 |
break; |
| 342 |
s = atoi(++b) - 2; |
| 343 |
b = strchr(b, '}'); |
| 344 |
b += 3; |
| 345 |
} else { |
| 346 |
return RESPONSE_NULLBODY; /* Null body. */ |
| 347 |
} |
| 348 |
} |
| 349 |
while (*b && s--) |
| 350 |
fetch[i++] = *(b++); |
| 351 |
|
| 352 |
fetch[i] = 0; |
| 353 |
|
| 354 |
return analyze_response(buf); |
| 355 |
} |
| 356 |
|
| 357 |
|
| 358 |
/* |
| 359 |
* Process the data that server sent due to IMAP FETCH RFC822.SIZE client |
| 360 |
* request. |
| 361 |
*/ |
| 362 |
int fetchsize_response(int *sock, unsigned int *size, unsigned int tag) |
| 363 |
{ |
| 364 |
char buf[RESPONSE_BUF]; |
| 365 |
char *c; |
| 366 |
|
| 367 |
*size = 0; |
| 368 |
|
| 369 |
reset_vbuf(); |
| 370 |
|
| 371 |
do { |
| 372 |
receive_response(sock, buf); |
| 373 |
bye_response(buf); |
| 374 |
check_vbuf(strlen(buf)); |
| 375 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 376 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 377 |
|
| 378 |
if ((c = strcasestr(vbuf, "FETCH (RFC822.SIZE "))) { |
| 379 |
c += 19; |
| 380 |
*size = strtoul(c, NULL, 10); |
| 381 |
} |
| 382 |
return analyze_response(buf); |
| 383 |
} |
| 384 |
|
| 385 |
|
| 386 |
/* |
| 387 |
* Process the data that server sent due to IMAP APPEND client request. |
| 388 |
*/ |
| 389 |
int append_response(int *sock, unsigned int tag) |
| 390 |
{ |
| 391 |
int r = RESPONSE_OK; |
| 392 |
char buf[RESPONSE_BUF]; |
| 393 |
|
| 394 |
reset_vbuf(); |
| 395 |
|
| 396 |
do { |
| 397 |
receive_response(sock, buf); |
| 398 |
bye_response(buf); |
| 399 |
check_vbuf(strlen(buf)); |
| 400 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 401 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 402 |
|
| 403 |
if ((r = analyze_response(buf)) == RESPONSE_NO && |
| 404 |
strcasestr(vbuf, "[TRYCREATE]")) |
| 405 |
return RESPONSE_TRYCREATE; |
| 406 |
|
| 407 |
return r; |
| 408 |
} |
| 409 |
|
| 410 |
|
| 411 |
/* |
| 412 |
* Process the data that server sent due to IMAP COPY client request. |
| 413 |
*/ |
| 414 |
int copy_response(int *sock, unsigned int tag) |
| 415 |
{ |
| 416 |
int r = RESPONSE_OK; |
| 417 |
char buf[RESPONSE_BUF]; |
| 418 |
|
| 419 |
reset_vbuf(); |
| 420 |
|
| 421 |
do { |
| 422 |
receive_response(sock, buf); |
| 423 |
bye_response(buf); |
| 424 |
check_vbuf(strlen(buf)); |
| 425 |
strncat(vbuf, buf, vbufs - strlen(vbuf)); |
| 426 |
} while (!strcasestr(buf, ultostr(tag, 16))); |
| 427 |
|
| 428 |
if ((r = analyze_response(buf)) == RESPONSE_NO && |
| 429 |
strcasestr(vbuf, "[TRYCREATE]")) |
| 430 |
return RESPONSE_TRYCREATE; |
| 431 |
|
| 432 |
return r; |
| 433 |
} |
| 434 |
|
| 435 |
|
| 436 |
/* |
| 437 |
* Check if response of server to client's request was succesfully |
| 438 |
* delivered or there was some kind of error. |
| 439 |
*/ |
| 440 |
int analyze_response(char *buf) |
| 441 |
{ |
| 442 |
int r = RESPONSE_OK; |
| 443 |
regex_t creg; |
| 444 |
regmatch_t match[3]; |
| 445 |
const char *reg = "[[:xdigit:]]{6,6} ((OK|NO|BAD)[[:print:]]*)\r\n"; |
| 446 |
char result[RESULT_BUF]; |
| 447 |
|
| 448 |
result[0] = 0; |
| 449 |
|
| 450 |
regcomp(&creg, reg, REG_EXTENDED | REG_ICASE); |
| 451 |
|
| 452 |
if (!regexec(&creg, buf, 3, match, 0)) { |
| 453 |
strncat(result, buf + match[1].rm_so, |
| 454 |
min(match[1].rm_eo - match[1].rm_so, RESULT_BUF - 1)); |
| 455 |
|
| 456 |
if (!strncasecmp(buf + match[2].rm_so, "NO", 2)) |
| 457 |
r = RESPONSE_NO; |
| 458 |
else if (!strncasecmp(buf + match[2].rm_so, "BAD", 3)) |
| 459 |
r = RESPONSE_BAD; |
| 460 |
|
| 461 |
verbose("Server response: %s\n", result); |
| 462 |
} else |
| 463 |
r = RESPONSE_NONE; |
| 464 |
|
| 465 |
regfree(&creg); |
| 466 |
|
| 467 |
return r; |
| 468 |
} |
| 469 |
|
| 470 |
|
| 471 |
/* |
| 472 |
* Initialize virtual buffer. |
| 473 |
*/ |
| 474 |
void init_vbuf(void) |
| 475 |
{ |
| 476 |
vbuf = xmalloc(VIRTUAL_BUF); |
| 477 |
*vbuf = 0; |
| 478 |
vbufs = VIRTUAL_BUF; |
| 479 |
} |
| 480 |
|
| 481 |
|
| 482 |
/* |
| 483 |
* Reset virtual buffer. |
| 484 |
*/ |
| 485 |
void reset_vbuf(void) |
| 486 |
{ |
| 487 |
*vbuf = 0; |
| 488 |
} |
| 489 |
|
| 490 |
|
| 491 |
/* |
| 492 |
* Check if virtual buffer is full and make it bigger. |
| 493 |
*/ |
| 494 |
void check_vbuf(size_t n) |
| 495 |
{ |
| 496 |
if (n + strlen(vbuf) >= vbufs) { |
| 497 |
vbufs += VIRTUAL_BUF; |
| 498 |
vbuf = xrealloc(vbuf, vbufs); |
| 499 |
} |
| 500 |
} |
Parent Directory
| 
Revision Log