Hash :
1a709604
Author :
Date :
2016-06-06T12:59:17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "git2/types.h"
#include "git2/errors.h"
#include "git2/refs.h"
#include "git2/revwalk.h"
#include "smart.h"
#include "util.h"
#include "netops.h"
#include "posix.h"
#include "buffer.h"
#include <ctype.h>
#define PKT_LEN_SIZE 4
static const char pkt_done_str[] = "0009done\n";
static const char pkt_flush_str[] = "0000";
static const char pkt_have_prefix[] = "0032have ";
static const char pkt_want_prefix[] = "0032want ";
static int flush_pkt(git_pkt **out)
{
git_pkt *pkt;
pkt = git__malloc(sizeof(git_pkt));
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_FLUSH;
*out = pkt;
return 0;
}
/* the rest of the line will be useful for multi_ack and multi_ack_detailed */
static int ack_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_ack *pkt;
GIT_UNUSED(line);
GIT_UNUSED(len);
pkt = git__calloc(1, sizeof(git_pkt_ack));
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_ACK;
line += 3;
len -= 3;
if (len >= GIT_OID_HEXSZ) {
git_oid_fromstr(&pkt->oid, line + 1);
line += GIT_OID_HEXSZ + 1;
len -= GIT_OID_HEXSZ + 1;
}
if (len >= 7) {
if (!git__prefixcmp(line + 1, "continue"))
pkt->status = GIT_ACK_CONTINUE;
if (!git__prefixcmp(line + 1, "common"))
pkt->status = GIT_ACK_COMMON;
if (!git__prefixcmp(line + 1, "ready"))
pkt->status = GIT_ACK_READY;
}
*out = (git_pkt *) pkt;
return 0;
}
static int nak_pkt(git_pkt **out)
{
git_pkt *pkt;
pkt = git__malloc(sizeof(git_pkt));
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_NAK;
*out = pkt;
return 0;
}
static int pack_pkt(git_pkt **out)
{
git_pkt *pkt;
pkt = git__malloc(sizeof(git_pkt));
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_PACK;
*out = pkt;
return 0;
}
static int comment_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_comment *pkt;
size_t alloclen;
GITERR_CHECK_ALLOC_ADD(&alloclen, sizeof(git_pkt_comment), len);
GITERR_CHECK_ALLOC_ADD(&alloclen, alloclen, 1);
pkt = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_COMMENT;
memcpy(pkt->comment, line, len);
pkt->comment[len] = '\0';
*out = (git_pkt *) pkt;
return 0;
}
static int err_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_err *pkt;
size_t alloclen;
/* Remove "ERR " from the line */
line += 4;
len -= 4;
GITERR_CHECK_ALLOC_ADD(&alloclen, sizeof(git_pkt_progress), len);
GITERR_CHECK_ALLOC_ADD(&alloclen, alloclen, 1);
pkt = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_ERR;
pkt->len = (int)len;
memcpy(pkt->error, line, len);
pkt->error[len] = '\0';
*out = (git_pkt *) pkt;
return 0;
}
static int data_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_data *pkt;
size_t alloclen;
line++;
len--;
GITERR_CHECK_ALLOC_ADD(&alloclen, sizeof(git_pkt_progress), len);
pkt = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_DATA;
pkt->len = (int) len;
memcpy(pkt->data, line, len);
*out = (git_pkt *) pkt;
return 0;
}
static int sideband_progress_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_progress *pkt;
size_t alloclen;
line++;
len--;
GITERR_CHECK_ALLOC_ADD(&alloclen, sizeof(git_pkt_progress), len);
pkt = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_PROGRESS;
pkt->len = (int) len;
memcpy(pkt->data, line, len);
*out = (git_pkt *) pkt;
return 0;
}
static int sideband_error_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_err *pkt;
size_t alloc_len;
line++;
len--;
GITERR_CHECK_ALLOC_ADD(&alloc_len, sizeof(git_pkt_err), len);
GITERR_CHECK_ALLOC_ADD(&alloc_len, alloc_len, 1);
pkt = git__malloc(alloc_len);
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_ERR;
pkt->len = (int)len;
memcpy(pkt->error, line, len);
pkt->error[len] = '\0';
*out = (git_pkt *)pkt;
return 0;
}
/*
* Parse an other-ref line.
*/
static int ref_pkt(git_pkt **out, const char *line, size_t len)
{
int error;
git_pkt_ref *pkt;
size_t alloclen;
pkt = git__malloc(sizeof(git_pkt_ref));
GITERR_CHECK_ALLOC(pkt);
memset(pkt, 0x0, sizeof(git_pkt_ref));
pkt->type = GIT_PKT_REF;
if ((error = git_oid_fromstr(&pkt->head.oid, line)) < 0)
goto error_out;
/* Check for a bit of consistency */
if (line[GIT_OID_HEXSZ] != ' ') {
giterr_set(GITERR_NET, "Error parsing pkt-line");
error = -1;
goto error_out;
}
/* Jump from the name */
line += GIT_OID_HEXSZ + 1;
len -= (GIT_OID_HEXSZ + 1);
if (line[len - 1] == '\n')
--len;
GITERR_CHECK_ALLOC_ADD(&alloclen, len, 1);
pkt->head.name = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt->head.name);
memcpy(pkt->head.name, line, len);
pkt->head.name[len] = '\0';
if (strlen(pkt->head.name) < len) {
pkt->capabilities = strchr(pkt->head.name, '\0') + 1;
}
*out = (git_pkt *)pkt;
return 0;
error_out:
git__free(pkt);
return error;
}
static int ok_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_ok *pkt;
const char *ptr;
size_t alloc_len;
pkt = git__malloc(sizeof(*pkt));
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_OK;
line += 3; /* skip "ok " */
if (!(ptr = strchr(line, '\n'))) {
giterr_set(GITERR_NET, "Invalid packet line");
git__free(pkt);
return -1;
}
len = ptr - line;
GITERR_CHECK_ALLOC_ADD(&alloc_len, len, 1);
pkt->ref = git__malloc(alloc_len);
GITERR_CHECK_ALLOC(pkt->ref);
memcpy(pkt->ref, line, len);
pkt->ref[len] = '\0';
*out = (git_pkt *)pkt;
return 0;
}
static int ng_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_ng *pkt;
const char *ptr;
size_t alloclen;
pkt = git__malloc(sizeof(*pkt));
GITERR_CHECK_ALLOC(pkt);
pkt->ref = NULL;
pkt->type = GIT_PKT_NG;
line += 3; /* skip "ng " */
if (!(ptr = strchr(line, ' ')))
goto out_err;
len = ptr - line;
GITERR_CHECK_ALLOC_ADD(&alloclen, len, 1);
pkt->ref = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt->ref);
memcpy(pkt->ref, line, len);
pkt->ref[len] = '\0';
line = ptr + 1;
if (!(ptr = strchr(line, '\n')))
goto out_err;
len = ptr - line;
GITERR_CHECK_ALLOC_ADD(&alloclen, len, 1);
pkt->msg = git__malloc(alloclen);
GITERR_CHECK_ALLOC(pkt->msg);
memcpy(pkt->msg, line, len);
pkt->msg[len] = '\0';
*out = (git_pkt *)pkt;
return 0;
out_err:
giterr_set(GITERR_NET, "Invalid packet line");
git__free(pkt->ref);
git__free(pkt);
return -1;
}
static int unpack_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_unpack *pkt;
GIT_UNUSED(len);
pkt = git__malloc(sizeof(*pkt));
GITERR_CHECK_ALLOC(pkt);
pkt->type = GIT_PKT_UNPACK;
if (!git__prefixcmp(line, "unpack ok"))
pkt->unpack_ok = 1;
else
pkt->unpack_ok = 0;
*out = (git_pkt *)pkt;
return 0;
}
static int32_t parse_len(const char *line)
{
char num[PKT_LEN_SIZE + 1];
int i, k, error;
int32_t len;
const char *num_end;
memcpy(num, line, PKT_LEN_SIZE);
num[PKT_LEN_SIZE] = '\0';
for (i = 0; i < PKT_LEN_SIZE; ++i) {
if (!isxdigit(num[i])) {
/* Make sure there are no special characters before passing to error message */
for (k = 0; k < PKT_LEN_SIZE; ++k) {
if(!isprint(num[k])) {
num[k] = '.';
}
}
giterr_set(GITERR_NET, "invalid hex digit in length: '%s'", num);
return -1;
}
}
if ((error = git__strtol32(&len, num, &num_end, 16)) < 0)
return error;
return len;
}
/*
* As per the documentation, the syntax is:
*
* pkt-line = data-pkt / flush-pkt
* data-pkt = pkt-len pkt-payload
* pkt-len = 4*(HEXDIG)
* pkt-payload = (pkt-len -4)*(OCTET)
* flush-pkt = "0000"
*
* Which means that the first four bytes are the length of the line,
* in ASCII hexadecimal (including itself)
*/
int git_pkt_parse_line(
git_pkt **head, const char *line, const char **out, size_t bufflen)
{
int ret;
int32_t len;
/* Not even enough for the length */
if (bufflen > 0 && bufflen < PKT_LEN_SIZE)
return GIT_EBUFS;
len = parse_len(line);
if (len < 0) {
/*
* If we fail to parse the length, it might be because the
* server is trying to send us the packfile already.
*/
if (bufflen >= 4 && !git__prefixcmp(line, "PACK")) {
giterr_clear();
*out = line;
return pack_pkt(head);
}
return (int)len;
}
/*
* If we were given a buffer length, then make sure there is
* enough in the buffer to satisfy this line
*/
if (bufflen > 0 && bufflen < (size_t)len)
return GIT_EBUFS;
line += PKT_LEN_SIZE;
/*
* TODO: How do we deal with empty lines? Try again? with the next
* line?
*/
if (len == PKT_LEN_SIZE) {
*head = NULL;
*out = line;
return 0;
}
if (len == 0) { /* Flush pkt */
*out = line;
return flush_pkt(head);
}
len -= PKT_LEN_SIZE; /* the encoded length includes its own size */
if (*line == GIT_SIDE_BAND_DATA)
ret = data_pkt(head, line, len);
else if (*line == GIT_SIDE_BAND_PROGRESS)
ret = sideband_progress_pkt(head, line, len);
else if (*line == GIT_SIDE_BAND_ERROR)
ret = sideband_error_pkt(head, line, len);
else if (!git__prefixcmp(line, "ACK"))
ret = ack_pkt(head, line, len);
else if (!git__prefixcmp(line, "NAK"))
ret = nak_pkt(head);
else if (!git__prefixcmp(line, "ERR "))
ret = err_pkt(head, line, len);
else if (*line == '#')
ret = comment_pkt(head, line, len);
else if (!git__prefixcmp(line, "ok"))
ret = ok_pkt(head, line, len);
else if (!git__prefixcmp(line, "ng"))
ret = ng_pkt(head, line, len);
else if (!git__prefixcmp(line, "unpack"))
ret = unpack_pkt(head, line, len);
else
ret = ref_pkt(head, line, len);
*out = line + len;
return ret;
}
void git_pkt_free(git_pkt *pkt)
{
if (pkt->type == GIT_PKT_REF) {
git_pkt_ref *p = (git_pkt_ref *) pkt;
git__free(p->head.name);
git__free(p->head.symref_target);
}
if (pkt->type == GIT_PKT_OK) {
git_pkt_ok *p = (git_pkt_ok *) pkt;
git__free(p->ref);
}
if (pkt->type == GIT_PKT_NG) {
git_pkt_ng *p = (git_pkt_ng *) pkt;
git__free(p->ref);
git__free(p->msg);
}
git__free(pkt);
}
int git_pkt_buffer_flush(git_buf *buf)
{
return git_buf_put(buf, pkt_flush_str, strlen(pkt_flush_str));
}
static int buffer_want_with_caps(const git_remote_head *head, transport_smart_caps *caps, git_buf *buf)
{
git_buf str = GIT_BUF_INIT;
char oid[GIT_OID_HEXSZ +1] = {0};
size_t len;
/* Prefer multi_ack_detailed */
if (caps->multi_ack_detailed)
git_buf_puts(&str, GIT_CAP_MULTI_ACK_DETAILED " ");
else if (caps->multi_ack)
git_buf_puts(&str, GIT_CAP_MULTI_ACK " ");
/* Prefer side-band-64k if the server supports both */
if (caps->side_band_64k)
git_buf_printf(&str, "%s ", GIT_CAP_SIDE_BAND_64K);
else if (caps->side_band)
git_buf_printf(&str, "%s ", GIT_CAP_SIDE_BAND);
if (caps->include_tag)
git_buf_puts(&str, GIT_CAP_INCLUDE_TAG " ");
if (caps->thin_pack)
git_buf_puts(&str, GIT_CAP_THIN_PACK " ");
if (caps->ofs_delta)
git_buf_puts(&str, GIT_CAP_OFS_DELTA " ");
if (git_buf_oom(&str))
return -1;
len = strlen("XXXXwant ") + GIT_OID_HEXSZ + 1 /* NUL */ +
git_buf_len(&str) + 1 /* LF */;
if (len > 0xffff) {
giterr_set(GITERR_NET,
"Tried to produce packet with invalid length %" PRIuZ, len);
return -1;
}
git_buf_grow_by(buf, len);
git_oid_fmt(oid, &head->oid);
git_buf_printf(buf,
"%04xwant %s %s\n", (unsigned int)len, oid, git_buf_cstr(&str));
git_buf_free(&str);
GITERR_CHECK_ALLOC_BUF(buf);
return 0;
}
/*
* All "want" packets have the same length and format, so what we do
* is overwrite the OID each time.
*/
int git_pkt_buffer_wants(
const git_remote_head * const *refs,
size_t count,
transport_smart_caps *caps,
git_buf *buf)
{
size_t i = 0;
const git_remote_head *head;
if (caps->common) {
for (; i < count; ++i) {
head = refs[i];
if (!head->local)
break;
}
if (buffer_want_with_caps(refs[i], caps, buf) < 0)
return -1;
i++;
}
for (; i < count; ++i) {
char oid[GIT_OID_HEXSZ];
head = refs[i];
if (head->local)
continue;
git_oid_fmt(oid, &head->oid);
git_buf_put(buf, pkt_want_prefix, strlen(pkt_want_prefix));
git_buf_put(buf, oid, GIT_OID_HEXSZ);
git_buf_putc(buf, '\n');
if (git_buf_oom(buf))
return -1;
}
return git_pkt_buffer_flush(buf);
}
int git_pkt_buffer_have(git_oid *oid, git_buf *buf)
{
char oidhex[GIT_OID_HEXSZ + 1];
memset(oidhex, 0x0, sizeof(oidhex));
git_oid_fmt(oidhex, oid);
return git_buf_printf(buf, "%s%s\n", pkt_have_prefix, oidhex);
}
int git_pkt_buffer_done(git_buf *buf)
{
return git_buf_puts(buf, pkt_done_str);
}