| 1 | #include "git-compat-util.h" |
| 2 | #include "copy.h" |
| 3 | #include "pkt-line.h" |
| 4 | #include "gettext.h" |
| 5 | #include "hex.h" |
| 6 | #include "run-command.h" |
| 7 | #include "sideband.h" |
| 8 | #include "trace.h" |
| 9 | #include "write-or-die.h" |
| 10 | |
| 11 | char packet_buffer[LARGE_PACKET_MAX]; |
| 12 | static const char *packet_trace_prefix = "git"; |
| 13 | static struct trace_key trace_packet = TRACE_KEY_INIT(PACKET); |
| 14 | static struct trace_key trace_pack = TRACE_KEY_INIT(PACKFILE); |
| 15 | |
| 16 | void packet_trace_identity(const char *prog) |
| 17 | { |
| 18 | packet_trace_prefix = xstrdup(prog); |
| 19 | } |
| 20 | |
| 21 | static const char *get_trace_prefix(void) |
| 22 | { |
| 23 | return in_async() ? "sideband" : packet_trace_prefix; |
| 24 | } |
| 25 | |
| 26 | static int packet_trace_pack(const char *buf, unsigned int len, int sideband) |
| 27 | { |
| 28 | if (!sideband) { |
| 29 | trace_verbatim(&trace_pack, buf, len); |
| 30 | return 1; |
| 31 | } else if (len && *buf == '\1') { |
| 32 | trace_verbatim(&trace_pack, buf + 1, len - 1); |
| 33 | return 1; |
| 34 | } else { |
| 35 | /* it's another non-pack sideband */ |
| 36 | return 0; |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | static void packet_trace(const char *buf, unsigned int len, int write) |
| 41 | { |
| 42 | struct strbuf out; |
| 43 | static int in_pack, sideband; |
| 44 | |
| 45 | if (!trace_want(&trace_packet) && !trace_want(&trace_pack)) |
| 46 | return; |
| 47 | |
| 48 | if (in_pack) { |
| 49 | if (packet_trace_pack(buf, len, sideband)) |
| 50 | return; |
| 51 | } else if (starts_with(buf, "PACK") || starts_with(buf, "\1PACK")) { |
| 52 | in_pack = 1; |
| 53 | sideband = *buf == '\1'; |
| 54 | packet_trace_pack(buf, len, sideband); |
| 55 | |
| 56 | /* |
| 57 | * Make a note in the human-readable trace that the pack data |
| 58 | * started. |
| 59 | */ |
| 60 | buf = "PACK ..."; |
| 61 | len = strlen(buf); |
| 62 | } |
| 63 | |
| 64 | if (!trace_want(&trace_packet)) |
| 65 | return; |
| 66 | |
| 67 | /* +32 is just a guess for header + quoting */ |
| 68 | strbuf_init(&out, len+32); |
| 69 | |
| 70 | strbuf_addf(&out, "packet: %12s%c ", |
| 71 | get_trace_prefix(), write ? '>' : '<'); |
| 72 | |
| 73 | /* XXX we should really handle printable utf8 */ |
| 74 | for (unsigned int i = 0; i < len; i++) { |
| 75 | /* suppress newlines */ |
| 76 | if (buf[i] == '\n') |
| 77 | continue; |
| 78 | if (buf[i] >= 0x20 && buf[i] <= 0x7e) |
| 79 | strbuf_addch(&out, buf[i]); |
| 80 | else |
| 81 | strbuf_addf(&out, "\\%o", buf[i]); |
| 82 | } |
| 83 | |
| 84 | strbuf_addch(&out, '\n'); |
| 85 | trace_strbuf(&trace_packet, &out); |
| 86 | strbuf_release(&out); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * If we buffered things up above (we don't, but we should), |
| 91 | * we'd flush it here |
| 92 | */ |
| 93 | void packet_flush(int fd) |
| 94 | { |
| 95 | packet_trace("0000", 4, 1); |
| 96 | if (write_in_full(fd, "0000", 4) < 0) |
| 97 | die_errno(_("unable to write flush packet")); |
| 98 | } |
| 99 | |
| 100 | void packet_delim(int fd) |
| 101 | { |
| 102 | packet_trace("0001", 4, 1); |
| 103 | if (write_in_full(fd, "0001", 4) < 0) |
| 104 | die_errno(_("unable to write delim packet")); |
| 105 | } |
| 106 | |
| 107 | void packet_response_end(int fd) |
| 108 | { |
| 109 | packet_trace("0002", 4, 1); |
| 110 | if (write_in_full(fd, "0002", 4) < 0) |
| 111 | die_errno(_("unable to write response end packet")); |
| 112 | } |
| 113 | |
| 114 | int packet_flush_gently(int fd) |
| 115 | { |
| 116 | packet_trace("0000", 4, 1); |
| 117 | if (write_in_full(fd, "0000", 4) < 0) |
| 118 | return error(_("flush packet write failed")); |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | void packet_buf_flush(struct strbuf *buf) |
| 123 | { |
| 124 | packet_trace("0000", 4, 1); |
| 125 | strbuf_add(buf, "0000", 4); |
| 126 | } |
| 127 | |
| 128 | void packet_buf_delim(struct strbuf *buf) |
| 129 | { |
| 130 | packet_trace("0001", 4, 1); |
| 131 | strbuf_add(buf, "0001", 4); |
| 132 | } |
| 133 | |
| 134 | void set_packet_header(char *buf, int size) |
| 135 | { |
| 136 | static char hexchar[] = "0123456789abcdef"; |
| 137 | |
| 138 | #define hex(a) (hexchar[(a) & 15]) |
| 139 | buf[0] = hex(size >> 12); |
| 140 | buf[1] = hex(size >> 8); |
| 141 | buf[2] = hex(size >> 4); |
| 142 | buf[3] = hex(size); |
| 143 | #undef hex |
| 144 | } |
| 145 | |
| 146 | static void format_packet(struct strbuf *out, const char *prefix, |
| 147 | const char *fmt, va_list args) |
| 148 | { |
| 149 | size_t orig_len, n; |
| 150 | |
| 151 | orig_len = out->len; |
| 152 | strbuf_addstr(out, "0000"); |
| 153 | strbuf_addstr(out, prefix); |
| 154 | strbuf_vaddf(out, fmt, args); |
| 155 | n = out->len - orig_len; |
| 156 | |
| 157 | if (n > LARGE_PACKET_MAX) |
| 158 | die(_("protocol error: impossibly long line")); |
| 159 | |
| 160 | set_packet_header(&out->buf[orig_len], n); |
| 161 | packet_trace(out->buf + orig_len + 4, n - 4, 1); |
| 162 | } |
| 163 | |
| 164 | static int packet_write_fmt_1(int fd, int gently, const char *prefix, |
| 165 | const char *fmt, va_list args) |
| 166 | { |
| 167 | static struct strbuf buf = STRBUF_INIT; |
| 168 | |
| 169 | strbuf_reset(&buf); |
| 170 | format_packet(&buf, prefix, fmt, args); |
| 171 | if (write_in_full(fd, buf.buf, buf.len) < 0) { |
| 172 | if (!gently) { |
| 173 | check_pipe(errno); |
| 174 | die_errno(_("packet write with format failed")); |
| 175 | } |
| 176 | return error(_("packet write with format failed")); |
| 177 | } |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | void packet_write_fmt(int fd, const char *fmt, ...) |
| 183 | { |
| 184 | va_list args; |
| 185 | |
| 186 | va_start(args, fmt); |
| 187 | packet_write_fmt_1(fd, 0, "", fmt, args); |
| 188 | va_end(args); |
| 189 | } |
| 190 | |
| 191 | int packet_write_fmt_gently(int fd, const char *fmt, ...) |
| 192 | { |
| 193 | int status; |
| 194 | va_list args; |
| 195 | |
| 196 | va_start(args, fmt); |
| 197 | status = packet_write_fmt_1(fd, 1, "", fmt, args); |
| 198 | va_end(args); |
| 199 | return status; |
| 200 | } |
| 201 | |
| 202 | static int do_packet_write(const int fd_out, const char *buf, size_t size, |
| 203 | struct strbuf *err) |
| 204 | { |
| 205 | char header[4]; |
| 206 | size_t packet_size; |
| 207 | |
| 208 | if (size > LARGE_PACKET_DATA_MAX) { |
| 209 | strbuf_addstr(err, _("packet write failed - data exceeds max packet size")); |
| 210 | return -1; |
| 211 | } |
| 212 | |
| 213 | packet_trace(buf, size, 1); |
| 214 | packet_size = size + 4; |
| 215 | |
| 216 | set_packet_header(header, packet_size); |
| 217 | |
| 218 | /* |
| 219 | * Write the header and the buffer in 2 parts so that we do |
| 220 | * not need to allocate a buffer or rely on a static buffer. |
| 221 | * This also avoids putting a large buffer on the stack which |
| 222 | * might have multi-threading issues. |
| 223 | */ |
| 224 | |
| 225 | if (write_in_full(fd_out, header, 4) < 0 || |
| 226 | write_in_full(fd_out, buf, size) < 0) { |
| 227 | strbuf_addf(err, _("packet write failed: %s"), strerror(errno)); |
| 228 | return -1; |
| 229 | } |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static int packet_write_gently(const int fd_out, const char *buf, size_t size) |
| 234 | { |
| 235 | struct strbuf err = STRBUF_INIT; |
| 236 | if (do_packet_write(fd_out, buf, size, &err)) { |
| 237 | error("%s", err.buf); |
| 238 | strbuf_release(&err); |
| 239 | return -1; |
| 240 | } |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | void packet_write(int fd_out, const char *buf, size_t size) |
| 245 | { |
| 246 | struct strbuf err = STRBUF_INIT; |
| 247 | if (do_packet_write(fd_out, buf, size, &err)) |
| 248 | die("%s", err.buf); |
| 249 | } |
| 250 | |
| 251 | void packet_fwrite(FILE *f, const char *buf, size_t size) |
| 252 | { |
| 253 | size_t packet_size; |
| 254 | char header[4]; |
| 255 | |
| 256 | if (size > LARGE_PACKET_DATA_MAX) |
| 257 | die(_("packet write failed - data exceeds max packet size")); |
| 258 | |
| 259 | packet_trace(buf, size, 1); |
| 260 | packet_size = size + 4; |
| 261 | |
| 262 | set_packet_header(header, packet_size); |
| 263 | fwrite_or_die(f, header, 4); |
| 264 | fwrite_or_die(f, buf, size); |
| 265 | } |
| 266 | |
| 267 | void packet_fwrite_fmt(FILE *fh, const char *fmt, ...) |
| 268 | { |
| 269 | static struct strbuf buf = STRBUF_INIT; |
| 270 | va_list args; |
| 271 | |
| 272 | strbuf_reset(&buf); |
| 273 | |
| 274 | va_start(args, fmt); |
| 275 | format_packet(&buf, "", fmt, args); |
| 276 | va_end(args); |
| 277 | |
| 278 | fwrite_or_die(fh, buf.buf, buf.len); |
| 279 | } |
| 280 | |
| 281 | void packet_fflush(FILE *f) |
| 282 | { |
| 283 | packet_trace("0000", 4, 1); |
| 284 | fwrite_or_die(f, "0000", 4); |
| 285 | fflush_or_die(f); |
| 286 | } |
| 287 | |
| 288 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) |
| 289 | { |
| 290 | va_list args; |
| 291 | |
| 292 | va_start(args, fmt); |
| 293 | format_packet(buf, "", fmt, args); |
| 294 | va_end(args); |
| 295 | } |
| 296 | |
| 297 | int write_packetized_from_fd_no_flush(int fd_in, int fd_out) |
| 298 | { |
| 299 | char *buf = xmalloc(LARGE_PACKET_DATA_MAX); |
| 300 | int err = 0; |
| 301 | ssize_t bytes_to_write; |
| 302 | |
| 303 | while (!err) { |
| 304 | bytes_to_write = xread(fd_in, buf, LARGE_PACKET_DATA_MAX); |
| 305 | if (bytes_to_write < 0) { |
| 306 | free(buf); |
| 307 | return COPY_READ_ERROR; |
| 308 | } |
| 309 | if (bytes_to_write == 0) |
| 310 | break; |
| 311 | err = packet_write_gently(fd_out, buf, bytes_to_write); |
| 312 | } |
| 313 | free(buf); |
| 314 | return err; |
| 315 | } |
| 316 | |
| 317 | int write_packetized_from_buf_no_flush_count(const char *src_in, size_t len, |
| 318 | int fd_out, int *packet_counter) |
| 319 | { |
| 320 | int err = 0; |
| 321 | size_t bytes_written = 0; |
| 322 | size_t bytes_to_write; |
| 323 | |
| 324 | while (!err) { |
| 325 | if ((len - bytes_written) > LARGE_PACKET_DATA_MAX) |
| 326 | bytes_to_write = LARGE_PACKET_DATA_MAX; |
| 327 | else |
| 328 | bytes_to_write = len - bytes_written; |
| 329 | if (bytes_to_write == 0) |
| 330 | break; |
| 331 | err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write); |
| 332 | bytes_written += bytes_to_write; |
| 333 | if (packet_counter) |
| 334 | (*packet_counter)++; |
| 335 | } |
| 336 | return err; |
| 337 | } |
| 338 | |
| 339 | static int get_packet_data(int fd, char **src_buf, size_t *src_size, |
| 340 | void *dst, size_t size, int options) |
| 341 | { |
| 342 | size_t bytes_read; |
| 343 | |
| 344 | if (fd >= 0 && src_buf && *src_buf) |
| 345 | BUG("multiple sources given to packet_read"); |
| 346 | |
| 347 | /* Read up to "size" bytes from our source, whatever it is. */ |
| 348 | if (src_buf && *src_buf) { |
| 349 | bytes_read = size < *src_size ? size : *src_size; |
| 350 | memcpy(dst, *src_buf, bytes_read); |
| 351 | *src_buf += bytes_read; |
| 352 | *src_size -= bytes_read; |
| 353 | } else { |
| 354 | ssize_t ret = read_in_full(fd, dst, size); |
| 355 | if (ret < 0) { |
| 356 | if (options & PACKET_READ_GENTLE_ON_READ_ERROR) |
| 357 | return error_errno(_("read error")); |
| 358 | die_errno(_("read error")); |
| 359 | } |
| 360 | |
| 361 | bytes_read = (size_t) ret; |
| 362 | } |
| 363 | |
| 364 | /* And complain if we didn't get enough bytes to satisfy the read. */ |
| 365 | if (bytes_read != size) { |
| 366 | if (options & PACKET_READ_GENTLE_ON_EOF) |
| 367 | return -1; |
| 368 | |
| 369 | if (options & PACKET_READ_GENTLE_ON_READ_ERROR) |
| 370 | return error(_("the remote end hung up unexpectedly")); |
| 371 | die(_("the remote end hung up unexpectedly")); |
| 372 | } |
| 373 | |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | int packet_length(const char lenbuf_hex[4], size_t size) |
| 378 | { |
| 379 | if (size < 4) |
| 380 | BUG("buffer too small"); |
| 381 | return hexval(lenbuf_hex[0]) << 12 | |
| 382 | hexval(lenbuf_hex[1]) << 8 | |
| 383 | hexval(lenbuf_hex[2]) << 4 | |
| 384 | hexval(lenbuf_hex[3]); |
| 385 | } |
| 386 | |
| 387 | static const char *find_packfile_uri_path(const char *buffer) |
| 388 | { |
| 389 | const char *URI_MARK = "://"; |
| 390 | const char *path; |
| 391 | int len; |
| 392 | |
| 393 | /* First char is sideband mark */ |
| 394 | buffer += 1; |
| 395 | |
| 396 | len = strspn(buffer, "0123456789abcdefABCDEF"); |
| 397 | /* size of SHA1 and SHA256 hash */ |
| 398 | if (!(len == 40 || len == 64) || buffer[len] != ' ') |
| 399 | return NULL; /* required "<hash>SP" not seen */ |
| 400 | |
| 401 | path = strstr(buffer + len + 1, URI_MARK); |
| 402 | if (!path) |
| 403 | return NULL; |
| 404 | |
| 405 | path = strchr(path + strlen(URI_MARK), '/'); |
| 406 | if (!path || !*(path + 1)) |
| 407 | return NULL; |
| 408 | |
| 409 | /* position after '/' */ |
| 410 | return ++path; |
| 411 | } |
| 412 | |
| 413 | enum packet_read_status packet_read_with_status(int fd, char **src_buffer, |
| 414 | size_t *src_len, char *buffer, |
| 415 | unsigned size, int *pktlen, |
| 416 | int options) |
| 417 | { |
| 418 | int len; |
| 419 | char linelen[4]; |
| 420 | const char *uri_path_start; |
| 421 | |
| 422 | if (get_packet_data(fd, src_buffer, src_len, linelen, 4, options) < 0) { |
| 423 | *pktlen = -1; |
| 424 | return PACKET_READ_EOF; |
| 425 | } |
| 426 | |
| 427 | len = packet_length(linelen, sizeof(linelen)); |
| 428 | |
| 429 | if (len < 0) { |
| 430 | if (options & PACKET_READ_GENTLE_ON_READ_ERROR) |
| 431 | return error(_("protocol error: bad line length " |
| 432 | "character: %.4s"), linelen); |
| 433 | die(_("protocol error: bad line length character: %.4s"), linelen); |
| 434 | } else if (!len) { |
| 435 | packet_trace("0000", 4, 0); |
| 436 | *pktlen = 0; |
| 437 | return PACKET_READ_FLUSH; |
| 438 | } else if (len == 1) { |
| 439 | packet_trace("0001", 4, 0); |
| 440 | *pktlen = 0; |
| 441 | return PACKET_READ_DELIM; |
| 442 | } else if (len == 2) { |
| 443 | packet_trace("0002", 4, 0); |
| 444 | *pktlen = 0; |
| 445 | return PACKET_READ_RESPONSE_END; |
| 446 | } else if (len < 4) { |
| 447 | if (options & PACKET_READ_GENTLE_ON_READ_ERROR) |
| 448 | return error(_("protocol error: bad line length %d"), |
| 449 | len); |
| 450 | die(_("protocol error: bad line length %d"), len); |
| 451 | } |
| 452 | |
| 453 | len -= 4; |
| 454 | if ((unsigned)len >= size) { |
| 455 | if (options & PACKET_READ_GENTLE_ON_READ_ERROR) |
| 456 | return error(_("protocol error: bad line length %d"), |
| 457 | len); |
| 458 | die(_("protocol error: bad line length %d"), len); |
| 459 | } |
| 460 | |
| 461 | if (get_packet_data(fd, src_buffer, src_len, buffer, len, options) < 0) { |
| 462 | *pktlen = -1; |
| 463 | return PACKET_READ_EOF; |
| 464 | } |
| 465 | |
| 466 | if ((options & PACKET_READ_CHOMP_NEWLINE) && |
| 467 | len && buffer[len-1] == '\n') { |
| 468 | if (options & PACKET_READ_USE_SIDEBAND) { |
| 469 | int band = *buffer & 0xff; |
| 470 | switch (band) { |
| 471 | case 1: |
| 472 | /* Chomp newline for payload */ |
| 473 | len--; |
| 474 | break; |
| 475 | case 2: |
| 476 | case 3: |
| 477 | /* |
| 478 | * Do not chomp newline for progress and error |
| 479 | * message. |
| 480 | */ |
| 481 | break; |
| 482 | default: |
| 483 | /* |
| 484 | * Bad sideband, let's leave it to |
| 485 | * demultiplex_sideband() to catch this error. |
| 486 | */ |
| 487 | break; |
| 488 | } |
| 489 | } else { |
| 490 | len--; |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | buffer[len] = 0; |
| 495 | if (options & PACKET_READ_REDACT_URI_PATH && |
| 496 | (uri_path_start = find_packfile_uri_path(buffer))) { |
| 497 | const char *redacted = "<redacted>"; |
| 498 | struct strbuf tracebuf = STRBUF_INIT; |
| 499 | strbuf_insert(&tracebuf, 0, buffer, len); |
| 500 | strbuf_splice(&tracebuf, uri_path_start - buffer, |
| 501 | strlen(uri_path_start), redacted, strlen(redacted)); |
| 502 | packet_trace(tracebuf.buf, tracebuf.len, 0); |
| 503 | strbuf_release(&tracebuf); |
| 504 | } else { |
| 505 | packet_trace(buffer, len, 0); |
| 506 | } |
| 507 | |
| 508 | if ((options & PACKET_READ_DIE_ON_ERR_PACKET) && |
| 509 | starts_with(buffer, "ERR ")) |
| 510 | die(_("remote error: %s"), buffer + 4); |
| 511 | |
| 512 | *pktlen = len; |
| 513 | return PACKET_READ_NORMAL; |
| 514 | } |
| 515 | |
| 516 | int packet_read(int fd, char *buffer, unsigned size, int options) |
| 517 | { |
| 518 | int pktlen = -1; |
| 519 | |
| 520 | packet_read_with_status(fd, NULL, NULL, buffer, size, &pktlen, |
| 521 | options); |
| 522 | |
| 523 | return pktlen; |
| 524 | } |
| 525 | |
| 526 | char *packet_read_line(int fd, int *dst_len) |
| 527 | { |
| 528 | int len = packet_read(fd, packet_buffer, sizeof(packet_buffer), |
| 529 | PACKET_READ_CHOMP_NEWLINE); |
| 530 | if (dst_len) |
| 531 | *dst_len = len; |
| 532 | return (len > 0) ? packet_buffer : NULL; |
| 533 | } |
| 534 | |
| 535 | int packet_read_line_gently(int fd, int *dst_len, char **dst_line) |
| 536 | { |
| 537 | int len = packet_read(fd, packet_buffer, sizeof(packet_buffer), |
| 538 | PACKET_READ_CHOMP_NEWLINE|PACKET_READ_GENTLE_ON_EOF); |
| 539 | if (dst_len) |
| 540 | *dst_len = len; |
| 541 | if (dst_line) |
| 542 | *dst_line = (len > 0) ? packet_buffer : NULL; |
| 543 | return len; |
| 544 | } |
| 545 | |
| 546 | ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out, int options) |
| 547 | { |
| 548 | int packet_len; |
| 549 | |
| 550 | size_t orig_len = sb_out->len; |
| 551 | size_t orig_alloc = sb_out->alloc; |
| 552 | |
| 553 | for (;;) { |
| 554 | strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX); |
| 555 | packet_len = packet_read(fd_in, |
| 556 | /* strbuf_grow() above always allocates one extra byte to |
| 557 | * store a '\0' at the end of the string. packet_read() |
| 558 | * writes a '\0' extra byte at the end, too. Let it know |
| 559 | * that there is already room for the extra byte. |
| 560 | */ |
| 561 | sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1, |
| 562 | options); |
| 563 | if (packet_len <= 0) |
| 564 | break; |
| 565 | sb_out->len += packet_len; |
| 566 | } |
| 567 | |
| 568 | if (packet_len < 0) { |
| 569 | if (orig_alloc == 0) |
| 570 | strbuf_release(sb_out); |
| 571 | else |
| 572 | strbuf_setlen(sb_out, orig_len); |
| 573 | return packet_len; |
| 574 | } |
| 575 | return sb_out->len - orig_len; |
| 576 | } |
| 577 | |
| 578 | int recv_sideband(const char *me, int in_stream, int out) |
| 579 | { |
| 580 | char buf[LARGE_PACKET_MAX + 1]; |
| 581 | int len; |
| 582 | struct strbuf scratch = STRBUF_INIT; |
| 583 | enum sideband_type sideband_type; |
| 584 | |
| 585 | while (1) { |
| 586 | int status = packet_read_with_status(in_stream, NULL, NULL, |
| 587 | buf, LARGE_PACKET_MAX, |
| 588 | &len, |
| 589 | PACKET_READ_GENTLE_ON_EOF); |
| 590 | if (!demultiplex_sideband(me, status, buf, len, 0, &scratch, |
| 591 | &sideband_type)) |
| 592 | continue; |
| 593 | switch (sideband_type) { |
| 594 | case SIDEBAND_PRIMARY: |
| 595 | write_or_die(out, buf + 1, len - 1); |
| 596 | break; |
| 597 | default: /* errors: message already written */ |
| 598 | if (scratch.len > 0) |
| 599 | BUG("unhandled incomplete sideband: '%s'", |
| 600 | scratch.buf); |
| 601 | return sideband_type; |
| 602 | } |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | /* Packet Reader Functions */ |
| 607 | void packet_reader_init(struct packet_reader *reader, int fd, |
| 608 | char *src_buffer, size_t src_len, |
| 609 | int options) |
| 610 | { |
| 611 | memset(reader, 0, sizeof(*reader)); |
| 612 | |
| 613 | reader->fd = fd; |
| 614 | reader->src_buffer = src_buffer; |
| 615 | reader->src_len = src_len; |
| 616 | reader->buffer = packet_buffer; |
| 617 | reader->buffer_size = sizeof(packet_buffer); |
| 618 | reader->options = options; |
| 619 | reader->me = "git"; |
| 620 | reader->hash_algo = &hash_algos[GIT_HASH_SHA1_LEGACY]; |
| 621 | strbuf_init(&reader->scratch, 0); |
| 622 | } |
| 623 | |
| 624 | enum packet_read_status packet_reader_read(struct packet_reader *reader) |
| 625 | { |
| 626 | if (reader->line_peeked) { |
| 627 | reader->line_peeked = 0; |
| 628 | return reader->status; |
| 629 | } |
| 630 | |
| 631 | if (reader->use_sideband) |
| 632 | reader->options |= PACKET_READ_USE_SIDEBAND; |
| 633 | |
| 634 | /* |
| 635 | * Consume all progress packets until a primary payload packet is |
| 636 | * received |
| 637 | */ |
| 638 | while (1) { |
| 639 | enum sideband_type sideband_type; |
| 640 | reader->status = packet_read_with_status(reader->fd, |
| 641 | &reader->src_buffer, |
| 642 | &reader->src_len, |
| 643 | reader->buffer, |
| 644 | reader->buffer_size, |
| 645 | &reader->pktlen, |
| 646 | reader->options); |
| 647 | if (!reader->use_sideband) |
| 648 | break; |
| 649 | if (demultiplex_sideband(reader->me, reader->status, |
| 650 | reader->buffer, reader->pktlen, 1, |
| 651 | &reader->scratch, &sideband_type)) |
| 652 | break; |
| 653 | } |
| 654 | |
| 655 | if (reader->status == PACKET_READ_NORMAL) |
| 656 | /* Skip the sideband designator if sideband is used */ |
| 657 | reader->line = reader->use_sideband ? |
| 658 | reader->buffer + 1 : reader->buffer; |
| 659 | else |
| 660 | reader->line = NULL; |
| 661 | |
| 662 | return reader->status; |
| 663 | } |
| 664 | |
| 665 | enum packet_read_status packet_reader_peek(struct packet_reader *reader) |
| 666 | { |
| 667 | /* Only allow peeking a single line */ |
| 668 | if (reader->line_peeked) |
| 669 | return reader->status; |
| 670 | |
| 671 | /* Peek a line by reading it and setting peeked flag */ |
| 672 | packet_reader_read(reader); |
| 673 | reader->line_peeked = 1; |
| 674 | return reader->status; |
| 675 | } |
| 676 | |
| 677 | void packet_writer_init(struct packet_writer *writer, int dest_fd) |
| 678 | { |
| 679 | writer->dest_fd = dest_fd; |
| 680 | writer->use_sideband = 0; |
| 681 | } |
| 682 | |
| 683 | void packet_writer_write(struct packet_writer *writer, const char *fmt, ...) |
| 684 | { |
| 685 | va_list args; |
| 686 | |
| 687 | va_start(args, fmt); |
| 688 | packet_write_fmt_1(writer->dest_fd, 0, |
| 689 | writer->use_sideband ? "\001" : "", fmt, args); |
| 690 | va_end(args); |
| 691 | } |
| 692 | |
| 693 | void packet_writer_error(struct packet_writer *writer, const char *fmt, ...) |
| 694 | { |
| 695 | va_list args; |
| 696 | |
| 697 | va_start(args, fmt); |
| 698 | packet_write_fmt_1(writer->dest_fd, 0, |
| 699 | writer->use_sideband ? "\003" : "ERR ", fmt, args); |
| 700 | va_end(args); |
| 701 | } |
| 702 | |
| 703 | void packet_writer_delim(struct packet_writer *writer) |
| 704 | { |
| 705 | packet_delim(writer->dest_fd); |
| 706 | } |
| 707 | |
| 708 | void packet_writer_flush(struct packet_writer *writer) |
| 709 | { |
| 710 | packet_flush(writer->dest_fd); |
| 711 | } |