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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 | int packet_flush_gently(int fd) | |
95 | { | |
96 | packet_trace("0000", 4, 1); | |
97 | if (write_in_full(fd, "0000", 4) < 0) | |
98 | return error("flush packet write failed"); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | void packet_buf_flush(struct strbuf *buf) | |
103 | { | |
104 | packet_trace("0000", 4, 1); | |
105 | strbuf_add(buf, "0000", 4); | |
106 | } | |
107 | ||
108 | static void set_packet_header(char *buf, const int size) | |
109 | { | |
110 | static char hexchar[] = "0123456789abcdef"; | |
111 | ||
112 | #define hex(a) (hexchar[(a) & 15]) | |
113 | buf[0] = hex(size >> 12); | |
114 | buf[1] = hex(size >> 8); | |
115 | buf[2] = hex(size >> 4); | |
116 | buf[3] = hex(size); | |
117 | #undef hex | |
118 | } | |
119 | ||
120 | static void format_packet(struct strbuf *out, const char *fmt, va_list args) | |
121 | { | |
122 | size_t orig_len, n; | |
123 | ||
124 | orig_len = out->len; | |
125 | strbuf_addstr(out, "0000"); | |
126 | strbuf_vaddf(out, fmt, args); | |
127 | n = out->len - orig_len; | |
128 | ||
129 | if (n > LARGE_PACKET_MAX) | |
130 | die("protocol error: impossibly long line"); | |
131 | ||
132 | set_packet_header(&out->buf[orig_len], n); | |
133 | packet_trace(out->buf + orig_len + 4, n - 4, 1); | |
134 | } | |
135 | ||
136 | static int packet_write_fmt_1(int fd, int gently, | |
137 | const char *fmt, va_list args) | |
138 | { | |
139 | static struct strbuf buf = STRBUF_INIT; | |
140 | ||
141 | strbuf_reset(&buf); | |
142 | format_packet(&buf, fmt, args); | |
143 | if (write_in_full(fd, buf.buf, buf.len) < 0) { | |
144 | if (!gently) { | |
145 | check_pipe(errno); | |
146 | die_errno("packet write with format failed"); | |
147 | } | |
148 | return error("packet write with format failed"); | |
149 | } | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | void packet_write_fmt(int fd, const char *fmt, ...) | |
155 | { | |
156 | va_list args; | |
157 | ||
158 | va_start(args, fmt); | |
159 | packet_write_fmt_1(fd, 0, fmt, args); | |
160 | va_end(args); | |
161 | } | |
162 | ||
163 | int packet_write_fmt_gently(int fd, const char *fmt, ...) | |
164 | { | |
165 | int status; | |
166 | va_list args; | |
167 | ||
168 | va_start(args, fmt); | |
169 | status = packet_write_fmt_1(fd, 1, fmt, args); | |
170 | va_end(args); | |
171 | return status; | |
172 | } | |
173 | ||
174 | static int packet_write_gently(const int fd_out, const char *buf, size_t size) | |
175 | { | |
176 | static char packet_write_buffer[LARGE_PACKET_MAX]; | |
177 | size_t packet_size; | |
178 | ||
179 | if (size > sizeof(packet_write_buffer) - 4) | |
180 | return error("packet write failed - data exceeds max packet size"); | |
181 | ||
182 | packet_trace(buf, size, 1); | |
183 | packet_size = size + 4; | |
184 | set_packet_header(packet_write_buffer, packet_size); | |
185 | memcpy(packet_write_buffer + 4, buf, size); | |
186 | if (write_in_full(fd_out, packet_write_buffer, packet_size) < 0) | |
187 | return error("packet write failed"); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | void packet_write(int fd_out, const char *buf, size_t size) | |
192 | { | |
193 | if (packet_write_gently(fd_out, buf, size)) | |
194 | die_errno("packet write failed"); | |
195 | } | |
196 | ||
197 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) | |
198 | { | |
199 | va_list args; | |
200 | ||
201 | va_start(args, fmt); | |
202 | format_packet(buf, fmt, args); | |
203 | va_end(args); | |
204 | } | |
205 | ||
206 | int write_packetized_from_fd(int fd_in, int fd_out) | |
207 | { | |
208 | static char buf[LARGE_PACKET_DATA_MAX]; | |
209 | int err = 0; | |
210 | ssize_t bytes_to_write; | |
211 | ||
212 | while (!err) { | |
213 | bytes_to_write = xread(fd_in, buf, sizeof(buf)); | |
214 | if (bytes_to_write < 0) | |
215 | return COPY_READ_ERROR; | |
216 | if (bytes_to_write == 0) | |
217 | break; | |
218 | err = packet_write_gently(fd_out, buf, bytes_to_write); | |
219 | } | |
220 | if (!err) | |
221 | err = packet_flush_gently(fd_out); | |
222 | return err; | |
223 | } | |
224 | ||
225 | int write_packetized_from_buf(const char *src_in, size_t len, int fd_out) | |
226 | { | |
227 | int err = 0; | |
228 | size_t bytes_written = 0; | |
229 | size_t bytes_to_write; | |
230 | ||
231 | while (!err) { | |
232 | if ((len - bytes_written) > LARGE_PACKET_DATA_MAX) | |
233 | bytes_to_write = LARGE_PACKET_DATA_MAX; | |
234 | else | |
235 | bytes_to_write = len - bytes_written; | |
236 | if (bytes_to_write == 0) | |
237 | break; | |
238 | err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write); | |
239 | bytes_written += bytes_to_write; | |
240 | } | |
241 | if (!err) | |
242 | err = packet_flush_gently(fd_out); | |
243 | return err; | |
244 | } | |
245 | ||
246 | static int get_packet_data(int fd, char **src_buf, size_t *src_size, | |
247 | void *dst, unsigned size, int options) | |
248 | { | |
249 | ssize_t ret; | |
250 | ||
251 | if (fd >= 0 && src_buf && *src_buf) | |
252 | die("BUG: multiple sources given to packet_read"); | |
253 | ||
254 | /* Read up to "size" bytes from our source, whatever it is. */ | |
255 | if (src_buf && *src_buf) { | |
256 | ret = size < *src_size ? size : *src_size; | |
257 | memcpy(dst, *src_buf, ret); | |
258 | *src_buf += ret; | |
259 | *src_size -= ret; | |
260 | } else { | |
261 | ret = read_in_full(fd, dst, size); | |
262 | if (ret < 0) | |
263 | die_errno("read error"); | |
264 | } | |
265 | ||
266 | /* And complain if we didn't get enough bytes to satisfy the read. */ | |
267 | if (ret != size) { | |
268 | if (options & PACKET_READ_GENTLE_ON_EOF) | |
269 | return -1; | |
270 | ||
271 | die("The remote end hung up unexpectedly"); | |
272 | } | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | static int packet_length(const char *linelen) | |
278 | { | |
279 | int val = hex2chr(linelen); | |
280 | return (val < 0) ? val : (val << 8) | hex2chr(linelen + 2); | |
281 | } | |
282 | ||
283 | int packet_read(int fd, char **src_buf, size_t *src_len, | |
284 | char *buffer, unsigned size, int options) | |
285 | { | |
286 | int len, ret; | |
287 | char linelen[4]; | |
288 | ||
289 | ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options); | |
290 | if (ret < 0) | |
291 | return ret; | |
292 | len = packet_length(linelen); | |
293 | if (len < 0) | |
294 | die("protocol error: bad line length character: %.4s", linelen); | |
295 | if (!len) { | |
296 | packet_trace("0000", 4, 0); | |
297 | return 0; | |
298 | } | |
299 | len -= 4; | |
300 | if (len >= size) | |
301 | die("protocol error: bad line length %d", len); | |
302 | ret = get_packet_data(fd, src_buf, src_len, buffer, len, options); | |
303 | if (ret < 0) | |
304 | return ret; | |
305 | ||
306 | if ((options & PACKET_READ_CHOMP_NEWLINE) && | |
307 | len && buffer[len-1] == '\n') | |
308 | len--; | |
309 | ||
310 | buffer[len] = 0; | |
311 | packet_trace(buffer, len, 0); | |
312 | return len; | |
313 | } | |
314 | ||
315 | static char *packet_read_line_generic(int fd, | |
316 | char **src, size_t *src_len, | |
317 | int *dst_len) | |
318 | { | |
319 | int len = packet_read(fd, src, src_len, | |
320 | packet_buffer, sizeof(packet_buffer), | |
321 | PACKET_READ_CHOMP_NEWLINE); | |
322 | if (dst_len) | |
323 | *dst_len = len; | |
324 | return (len > 0) ? packet_buffer : NULL; | |
325 | } | |
326 | ||
327 | char *packet_read_line(int fd, int *len_p) | |
328 | { | |
329 | return packet_read_line_generic(fd, NULL, NULL, len_p); | |
330 | } | |
331 | ||
332 | int packet_read_line_gently(int fd, int *dst_len, char **dst_line) | |
333 | { | |
334 | int len = packet_read(fd, NULL, NULL, | |
335 | packet_buffer, sizeof(packet_buffer), | |
336 | PACKET_READ_CHOMP_NEWLINE|PACKET_READ_GENTLE_ON_EOF); | |
337 | if (dst_len) | |
338 | *dst_len = len; | |
339 | if (dst_line) | |
340 | *dst_line = (len > 0) ? packet_buffer : NULL; | |
341 | return len; | |
342 | } | |
343 | ||
344 | char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len) | |
345 | { | |
346 | return packet_read_line_generic(-1, src, src_len, dst_len); | |
347 | } | |
348 | ||
349 | ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out) | |
350 | { | |
351 | int packet_len; | |
352 | ||
353 | size_t orig_len = sb_out->len; | |
354 | size_t orig_alloc = sb_out->alloc; | |
355 | ||
356 | for (;;) { | |
357 | strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX); | |
358 | packet_len = packet_read(fd_in, NULL, NULL, | |
359 | /* strbuf_grow() above always allocates one extra byte to | |
360 | * store a '\0' at the end of the string. packet_read() | |
361 | * writes a '\0' extra byte at the end, too. Let it know | |
362 | * that there is already room for the extra byte. | |
363 | */ | |
364 | sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1, | |
365 | PACKET_READ_GENTLE_ON_EOF); | |
366 | if (packet_len <= 0) | |
367 | break; | |
368 | sb_out->len += packet_len; | |
369 | } | |
370 | ||
371 | if (packet_len < 0) { | |
372 | if (orig_alloc == 0) | |
373 | strbuf_release(sb_out); | |
374 | else | |
375 | strbuf_setlen(sb_out, orig_len); | |
376 | return packet_len; | |
377 | } | |
378 | return sb_out->len - orig_len; | |
379 | } |