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1 | #include "cache.h" | |
2 | #include "pkt-line.h" | |
3 | #include "run-command.h" | |
4 | ||
5 | char packet_buffer[LARGE_PACKET_MAX]; | |
6 | static const char *packet_trace_prefix = "git"; | |
7 | static struct trace_key trace_packet = TRACE_KEY_INIT(PACKET); | |
8 | static struct trace_key trace_pack = TRACE_KEY_INIT(PACKFILE); | |
9 | ||
10 | void packet_trace_identity(const char *prog) | |
11 | { | |
12 | packet_trace_prefix = xstrdup(prog); | |
13 | } | |
14 | ||
15 | static const char *get_trace_prefix(void) | |
16 | { | |
17 | return in_async() ? "sideband" : packet_trace_prefix; | |
18 | } | |
19 | ||
20 | static int packet_trace_pack(const char *buf, unsigned int len, int sideband) | |
21 | { | |
22 | if (!sideband) { | |
23 | trace_verbatim(&trace_pack, buf, len); | |
24 | return 1; | |
25 | } else if (len && *buf == '\1') { | |
26 | trace_verbatim(&trace_pack, buf + 1, len - 1); | |
27 | return 1; | |
28 | } else { | |
29 | /* it's another non-pack sideband */ | |
30 | return 0; | |
31 | } | |
32 | } | |
33 | ||
34 | static void packet_trace(const char *buf, unsigned int len, int write) | |
35 | { | |
36 | int i; | |
37 | struct strbuf out; | |
38 | static int in_pack, sideband; | |
39 | ||
40 | if (!trace_want(&trace_packet) && !trace_want(&trace_pack)) | |
41 | return; | |
42 | ||
43 | if (in_pack) { | |
44 | if (packet_trace_pack(buf, len, sideband)) | |
45 | return; | |
46 | } else if (starts_with(buf, "PACK") || starts_with(buf, "\1PACK")) { | |
47 | in_pack = 1; | |
48 | sideband = *buf == '\1'; | |
49 | packet_trace_pack(buf, len, sideband); | |
50 | ||
51 | /* | |
52 | * Make a note in the human-readable trace that the pack data | |
53 | * started. | |
54 | */ | |
55 | buf = "PACK ..."; | |
56 | len = strlen(buf); | |
57 | } | |
58 | ||
59 | if (!trace_want(&trace_packet)) | |
60 | return; | |
61 | ||
62 | /* +32 is just a guess for header + quoting */ | |
63 | strbuf_init(&out, len+32); | |
64 | ||
65 | strbuf_addf(&out, "packet: %12s%c ", | |
66 | get_trace_prefix(), write ? '>' : '<'); | |
67 | ||
68 | /* XXX we should really handle printable utf8 */ | |
69 | for (i = 0; i < len; i++) { | |
70 | /* suppress newlines */ | |
71 | if (buf[i] == '\n') | |
72 | continue; | |
73 | if (buf[i] >= 0x20 && buf[i] <= 0x7e) | |
74 | strbuf_addch(&out, buf[i]); | |
75 | else | |
76 | strbuf_addf(&out, "\\%o", buf[i]); | |
77 | } | |
78 | ||
79 | strbuf_addch(&out, '\n'); | |
80 | trace_strbuf(&trace_packet, &out); | |
81 | strbuf_release(&out); | |
82 | } | |
83 | ||
84 | /* | |
85 | * If we buffered things up above (we don't, but we should), | |
86 | * we'd flush it here | |
87 | */ | |
88 | void packet_flush(int fd) | |
89 | { | |
90 | packet_trace("0000", 4, 1); | |
91 | write_or_die(fd, "0000", 4); | |
92 | } | |
93 | ||
94 | void packet_delim(int fd) | |
95 | { | |
96 | packet_trace("0001", 4, 1); | |
97 | write_or_die(fd, "0001", 4); | |
98 | } | |
99 | ||
100 | int packet_flush_gently(int fd) | |
101 | { | |
102 | packet_trace("0000", 4, 1); | |
103 | if (write_in_full(fd, "0000", 4) < 0) | |
104 | return error(_("flush packet write failed")); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | void packet_buf_flush(struct strbuf *buf) | |
109 | { | |
110 | packet_trace("0000", 4, 1); | |
111 | strbuf_add(buf, "0000", 4); | |
112 | } | |
113 | ||
114 | void packet_buf_delim(struct strbuf *buf) | |
115 | { | |
116 | packet_trace("0001", 4, 1); | |
117 | strbuf_add(buf, "0001", 4); | |
118 | } | |
119 | ||
120 | static void set_packet_header(char *buf, const int size) | |
121 | { | |
122 | static char hexchar[] = "0123456789abcdef"; | |
123 | ||
124 | #define hex(a) (hexchar[(a) & 15]) | |
125 | buf[0] = hex(size >> 12); | |
126 | buf[1] = hex(size >> 8); | |
127 | buf[2] = hex(size >> 4); | |
128 | buf[3] = hex(size); | |
129 | #undef hex | |
130 | } | |
131 | ||
132 | static void format_packet(struct strbuf *out, const char *fmt, va_list args) | |
133 | { | |
134 | size_t orig_len, n; | |
135 | ||
136 | orig_len = out->len; | |
137 | strbuf_addstr(out, "0000"); | |
138 | strbuf_vaddf(out, fmt, args); | |
139 | n = out->len - orig_len; | |
140 | ||
141 | if (n > LARGE_PACKET_MAX) | |
142 | die(_("protocol error: impossibly long line")); | |
143 | ||
144 | set_packet_header(&out->buf[orig_len], n); | |
145 | packet_trace(out->buf + orig_len + 4, n - 4, 1); | |
146 | } | |
147 | ||
148 | static int packet_write_fmt_1(int fd, int gently, | |
149 | const char *fmt, va_list args) | |
150 | { | |
151 | static struct strbuf buf = STRBUF_INIT; | |
152 | ||
153 | strbuf_reset(&buf); | |
154 | format_packet(&buf, fmt, args); | |
155 | if (write_in_full(fd, buf.buf, buf.len) < 0) { | |
156 | if (!gently) { | |
157 | check_pipe(errno); | |
158 | die_errno(_("packet write with format failed")); | |
159 | } | |
160 | return error(_("packet write with format failed")); | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | void packet_write_fmt(int fd, const char *fmt, ...) | |
167 | { | |
168 | va_list args; | |
169 | ||
170 | va_start(args, fmt); | |
171 | packet_write_fmt_1(fd, 0, fmt, args); | |
172 | va_end(args); | |
173 | } | |
174 | ||
175 | int packet_write_fmt_gently(int fd, const char *fmt, ...) | |
176 | { | |
177 | int status; | |
178 | va_list args; | |
179 | ||
180 | va_start(args, fmt); | |
181 | status = packet_write_fmt_1(fd, 1, fmt, args); | |
182 | va_end(args); | |
183 | return status; | |
184 | } | |
185 | ||
186 | static int packet_write_gently(const int fd_out, const char *buf, size_t size) | |
187 | { | |
188 | static char packet_write_buffer[LARGE_PACKET_MAX]; | |
189 | size_t packet_size; | |
190 | ||
191 | if (size > sizeof(packet_write_buffer) - 4) | |
192 | return error(_("packet write failed - data exceeds max packet size")); | |
193 | ||
194 | packet_trace(buf, size, 1); | |
195 | packet_size = size + 4; | |
196 | set_packet_header(packet_write_buffer, packet_size); | |
197 | memcpy(packet_write_buffer + 4, buf, size); | |
198 | if (write_in_full(fd_out, packet_write_buffer, packet_size) < 0) | |
199 | return error(_("packet write failed")); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | void packet_write(int fd_out, const char *buf, size_t size) | |
204 | { | |
205 | if (packet_write_gently(fd_out, buf, size)) | |
206 | die_errno(_("packet write failed")); | |
207 | } | |
208 | ||
209 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) | |
210 | { | |
211 | va_list args; | |
212 | ||
213 | va_start(args, fmt); | |
214 | format_packet(buf, fmt, args); | |
215 | va_end(args); | |
216 | } | |
217 | ||
218 | void packet_buf_write_len(struct strbuf *buf, const char *data, size_t len) | |
219 | { | |
220 | size_t orig_len, n; | |
221 | ||
222 | orig_len = buf->len; | |
223 | strbuf_addstr(buf, "0000"); | |
224 | strbuf_add(buf, data, len); | |
225 | n = buf->len - orig_len; | |
226 | ||
227 | if (n > LARGE_PACKET_MAX) | |
228 | die(_("protocol error: impossibly long line")); | |
229 | ||
230 | set_packet_header(&buf->buf[orig_len], n); | |
231 | packet_trace(data, len, 1); | |
232 | } | |
233 | ||
234 | int write_packetized_from_fd(int fd_in, int fd_out) | |
235 | { | |
236 | static char buf[LARGE_PACKET_DATA_MAX]; | |
237 | int err = 0; | |
238 | ssize_t bytes_to_write; | |
239 | ||
240 | while (!err) { | |
241 | bytes_to_write = xread(fd_in, buf, sizeof(buf)); | |
242 | if (bytes_to_write < 0) | |
243 | return COPY_READ_ERROR; | |
244 | if (bytes_to_write == 0) | |
245 | break; | |
246 | err = packet_write_gently(fd_out, buf, bytes_to_write); | |
247 | } | |
248 | if (!err) | |
249 | err = packet_flush_gently(fd_out); | |
250 | return err; | |
251 | } | |
252 | ||
253 | int write_packetized_from_buf(const char *src_in, size_t len, int fd_out) | |
254 | { | |
255 | int err = 0; | |
256 | size_t bytes_written = 0; | |
257 | size_t bytes_to_write; | |
258 | ||
259 | while (!err) { | |
260 | if ((len - bytes_written) > LARGE_PACKET_DATA_MAX) | |
261 | bytes_to_write = LARGE_PACKET_DATA_MAX; | |
262 | else | |
263 | bytes_to_write = len - bytes_written; | |
264 | if (bytes_to_write == 0) | |
265 | break; | |
266 | err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write); | |
267 | bytes_written += bytes_to_write; | |
268 | } | |
269 | if (!err) | |
270 | err = packet_flush_gently(fd_out); | |
271 | return err; | |
272 | } | |
273 | ||
274 | static int get_packet_data(int fd, char **src_buf, size_t *src_size, | |
275 | void *dst, unsigned size, int options) | |
276 | { | |
277 | ssize_t ret; | |
278 | ||
279 | if (fd >= 0 && src_buf && *src_buf) | |
280 | BUG("multiple sources given to packet_read"); | |
281 | ||
282 | /* Read up to "size" bytes from our source, whatever it is. */ | |
283 | if (src_buf && *src_buf) { | |
284 | ret = size < *src_size ? size : *src_size; | |
285 | memcpy(dst, *src_buf, ret); | |
286 | *src_buf += ret; | |
287 | *src_size -= ret; | |
288 | } else { | |
289 | ret = read_in_full(fd, dst, size); | |
290 | if (ret < 0) | |
291 | die_errno(_("read error")); | |
292 | } | |
293 | ||
294 | /* And complain if we didn't get enough bytes to satisfy the read. */ | |
295 | if (ret != size) { | |
296 | if (options & PACKET_READ_GENTLE_ON_EOF) | |
297 | return -1; | |
298 | ||
299 | die(_("the remote end hung up unexpectedly")); | |
300 | } | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
305 | static int packet_length(const char *linelen) | |
306 | { | |
307 | int val = hex2chr(linelen); | |
308 | return (val < 0) ? val : (val << 8) | hex2chr(linelen + 2); | |
309 | } | |
310 | ||
311 | enum packet_read_status packet_read_with_status(int fd, char **src_buffer, | |
312 | size_t *src_len, char *buffer, | |
313 | unsigned size, int *pktlen, | |
314 | int options) | |
315 | { | |
316 | int len; | |
317 | char linelen[4]; | |
318 | ||
319 | if (get_packet_data(fd, src_buffer, src_len, linelen, 4, options) < 0) { | |
320 | *pktlen = -1; | |
321 | return PACKET_READ_EOF; | |
322 | } | |
323 | ||
324 | len = packet_length(linelen); | |
325 | ||
326 | if (len < 0) { | |
327 | die(_("protocol error: bad line length character: %.4s"), linelen); | |
328 | } else if (!len) { | |
329 | packet_trace("0000", 4, 0); | |
330 | *pktlen = 0; | |
331 | return PACKET_READ_FLUSH; | |
332 | } else if (len == 1) { | |
333 | packet_trace("0001", 4, 0); | |
334 | *pktlen = 0; | |
335 | return PACKET_READ_DELIM; | |
336 | } else if (len < 4) { | |
337 | die(_("protocol error: bad line length %d"), len); | |
338 | } | |
339 | ||
340 | len -= 4; | |
341 | if ((unsigned)len >= size) | |
342 | die(_("protocol error: bad line length %d"), len); | |
343 | ||
344 | if (get_packet_data(fd, src_buffer, src_len, buffer, len, options) < 0) { | |
345 | *pktlen = -1; | |
346 | return PACKET_READ_EOF; | |
347 | } | |
348 | ||
349 | if ((options & PACKET_READ_CHOMP_NEWLINE) && | |
350 | len && buffer[len-1] == '\n') | |
351 | len--; | |
352 | ||
353 | buffer[len] = 0; | |
354 | packet_trace(buffer, len, 0); | |
355 | *pktlen = len; | |
356 | return PACKET_READ_NORMAL; | |
357 | } | |
358 | ||
359 | int packet_read(int fd, char **src_buffer, size_t *src_len, | |
360 | char *buffer, unsigned size, int options) | |
361 | { | |
362 | int pktlen = -1; | |
363 | ||
364 | packet_read_with_status(fd, src_buffer, src_len, buffer, size, | |
365 | &pktlen, options); | |
366 | ||
367 | return pktlen; | |
368 | } | |
369 | ||
370 | static char *packet_read_line_generic(int fd, | |
371 | char **src, size_t *src_len, | |
372 | int *dst_len) | |
373 | { | |
374 | int len = packet_read(fd, src, src_len, | |
375 | packet_buffer, sizeof(packet_buffer), | |
376 | PACKET_READ_CHOMP_NEWLINE); | |
377 | if (dst_len) | |
378 | *dst_len = len; | |
379 | return (len > 0) ? packet_buffer : NULL; | |
380 | } | |
381 | ||
382 | char *packet_read_line(int fd, int *len_p) | |
383 | { | |
384 | return packet_read_line_generic(fd, NULL, NULL, len_p); | |
385 | } | |
386 | ||
387 | int packet_read_line_gently(int fd, int *dst_len, char **dst_line) | |
388 | { | |
389 | int len = packet_read(fd, NULL, NULL, | |
390 | packet_buffer, sizeof(packet_buffer), | |
391 | PACKET_READ_CHOMP_NEWLINE|PACKET_READ_GENTLE_ON_EOF); | |
392 | if (dst_len) | |
393 | *dst_len = len; | |
394 | if (dst_line) | |
395 | *dst_line = (len > 0) ? packet_buffer : NULL; | |
396 | return len; | |
397 | } | |
398 | ||
399 | char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len) | |
400 | { | |
401 | return packet_read_line_generic(-1, src, src_len, dst_len); | |
402 | } | |
403 | ||
404 | ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out) | |
405 | { | |
406 | int packet_len; | |
407 | ||
408 | size_t orig_len = sb_out->len; | |
409 | size_t orig_alloc = sb_out->alloc; | |
410 | ||
411 | for (;;) { | |
412 | strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX); | |
413 | packet_len = packet_read(fd_in, NULL, NULL, | |
414 | /* strbuf_grow() above always allocates one extra byte to | |
415 | * store a '\0' at the end of the string. packet_read() | |
416 | * writes a '\0' extra byte at the end, too. Let it know | |
417 | * that there is already room for the extra byte. | |
418 | */ | |
419 | sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1, | |
420 | PACKET_READ_GENTLE_ON_EOF); | |
421 | if (packet_len <= 0) | |
422 | break; | |
423 | sb_out->len += packet_len; | |
424 | } | |
425 | ||
426 | if (packet_len < 0) { | |
427 | if (orig_alloc == 0) | |
428 | strbuf_release(sb_out); | |
429 | else | |
430 | strbuf_setlen(sb_out, orig_len); | |
431 | return packet_len; | |
432 | } | |
433 | return sb_out->len - orig_len; | |
434 | } | |
435 | ||
436 | /* Packet Reader Functions */ | |
437 | void packet_reader_init(struct packet_reader *reader, int fd, | |
438 | char *src_buffer, size_t src_len, | |
439 | int options) | |
440 | { | |
441 | memset(reader, 0, sizeof(*reader)); | |
442 | ||
443 | reader->fd = fd; | |
444 | reader->src_buffer = src_buffer; | |
445 | reader->src_len = src_len; | |
446 | reader->buffer = packet_buffer; | |
447 | reader->buffer_size = sizeof(packet_buffer); | |
448 | reader->options = options; | |
449 | } | |
450 | ||
451 | enum packet_read_status packet_reader_read(struct packet_reader *reader) | |
452 | { | |
453 | if (reader->line_peeked) { | |
454 | reader->line_peeked = 0; | |
455 | return reader->status; | |
456 | } | |
457 | ||
458 | reader->status = packet_read_with_status(reader->fd, | |
459 | &reader->src_buffer, | |
460 | &reader->src_len, | |
461 | reader->buffer, | |
462 | reader->buffer_size, | |
463 | &reader->pktlen, | |
464 | reader->options); | |
465 | ||
466 | if (reader->status == PACKET_READ_NORMAL) | |
467 | reader->line = reader->buffer; | |
468 | else | |
469 | reader->line = NULL; | |
470 | ||
471 | return reader->status; | |
472 | } | |
473 | ||
474 | enum packet_read_status packet_reader_peek(struct packet_reader *reader) | |
475 | { | |
476 | /* Only allow peeking a single line */ | |
477 | if (reader->line_peeked) | |
478 | return reader->status; | |
479 | ||
480 | /* Peek a line by reading it and setting peeked flag */ | |
481 | packet_reader_read(reader); | |
482 | reader->line_peeked = 1; | |
483 | return reader->status; | |
484 | } |