1#include "cache.h"
2#include "pkt-line.h"
3#include "quote.h"
4#include <sys/wait.h>
5#include <sys/socket.h>
6#include <netinet/in.h>
7#include <arpa/inet.h>
8#include <netdb.h>
9
10/*
11 * Read all the refs from the other end
12 */
13struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match)
14{
15 *list = NULL;
16 for (;;) {
17 struct ref *ref;
18 unsigned char old_sha1[20];
19 static char buffer[1000];
20 char *name;
21 int len;
22
23 len = packet_read_line(in, buffer, sizeof(buffer));
24 if (!len)
25 break;
26 if (buffer[len-1] == '\n')
27 buffer[--len] = 0;
28
29 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
30 die("protocol error: expected sha/ref, got '%s'", buffer);
31 name = buffer + 41;
32 if (nr_match && !path_match(name, nr_match, match))
33 continue;
34 ref = xcalloc(1, sizeof(*ref) + len - 40);
35 memcpy(ref->old_sha1, old_sha1, 20);
36 memcpy(ref->name, buffer + 41, len - 40);
37 *list = ref;
38 list = &ref->next;
39 }
40 return list;
41}
42
43int get_ack(int fd, unsigned char *result_sha1)
44{
45 static char line[1000];
46 int len = packet_read_line(fd, line, sizeof(line));
47
48 if (!len)
49 die("git-fetch-pack: expected ACK/NAK, got EOF");
50 if (line[len-1] == '\n')
51 line[--len] = 0;
52 if (!strcmp(line, "NAK"))
53 return 0;
54 if (!strncmp(line, "ACK ", 3)) {
55 if (!get_sha1_hex(line+4, result_sha1))
56 return 1;
57 }
58 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
59}
60
61int path_match(const char *path, int nr, char **match)
62{
63 int i;
64 int pathlen = strlen(path);
65
66 for (i = 0; i < nr; i++) {
67 char *s = match[i];
68 int len = strlen(s);
69
70 if (!len || len > pathlen)
71 continue;
72 if (memcmp(path + pathlen - len, s, len))
73 continue;
74 if (pathlen > len && path[pathlen - len - 1] != '/')
75 continue;
76 *s = 0;
77 return 1;
78 }
79 return 0;
80}
81
82struct refspec {
83 char *src;
84 char *dst;
85};
86
87static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
88{
89 int i;
90 struct refspec *rs = xmalloc(sizeof(*rs) * (nr_refspec + 1));
91 for (i = 0; i < nr_refspec; i++) {
92 char *sp, *dp, *ep;
93 sp = refspec[i];
94 ep = strchr(sp, ':');
95 if (ep) {
96 dp = ep + 1;
97 *ep = 0;
98 }
99 else
100 dp = sp;
101 rs[i].src = sp;
102 rs[i].dst = dp;
103 }
104 rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
105 return rs;
106}
107
108static int count_refspec_match(const char *pattern,
109 struct ref *refs,
110 struct ref **matched_ref)
111{
112 int match;
113 int patlen = strlen(pattern);
114
115 for (match = 0; refs; refs = refs->next) {
116 char *name = refs->name;
117 int namelen = strlen(name);
118 if (namelen < patlen ||
119 memcmp(name + namelen - patlen, pattern, patlen))
120 continue;
121 if (namelen != patlen && name[namelen - patlen - 1] != '/')
122 continue;
123 match++;
124 *matched_ref = refs;
125 }
126 return match;
127}
128
129static void link_dst_tail(struct ref *ref, struct ref ***tail)
130{
131 **tail = ref;
132 *tail = &ref->next;
133 **tail = NULL;
134}
135
136static int match_explicit_refs(struct ref *src, struct ref *dst,
137 struct ref ***dst_tail, struct refspec *rs)
138{
139 int i, errs;
140 for (i = errs = 0; rs[i].src; i++) {
141 struct ref *matched_src, *matched_dst;
142
143 matched_src = matched_dst = NULL;
144 switch (count_refspec_match(rs[i].src, src, &matched_src)) {
145 case 1:
146 break;
147 case 0:
148 errs = 1;
149 error("src refspec %s does not match any.");
150 break;
151 default:
152 errs = 1;
153 error("src refspec %s matches more than one.",
154 rs[i].src);
155 break;
156 }
157 switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
158 case 1:
159 break;
160 case 0:
161 if (!memcmp(rs[i].dst, "refs/", 5)) {
162 int len = strlen(rs[i].dst) + 1;
163 matched_dst = xcalloc(1, sizeof(*dst) + len);
164 memcpy(matched_dst->name, rs[i].dst, len);
165 link_dst_tail(matched_dst, dst_tail);
166 }
167 else if (!strcmp(rs[i].src, rs[i].dst) &&
168 matched_src) {
169 /* pushing "master:master" when
170 * remote does not have master yet.
171 */
172 int len = strlen(matched_src->name);
173 matched_dst = xcalloc(1, sizeof(*dst) + len);
174 memcpy(matched_dst->name, matched_src->name,
175 len);
176 link_dst_tail(matched_dst, dst_tail);
177 }
178 else {
179 errs = 1;
180 error("dst refspec %s does not match any "
181 "existing ref on the remote and does "
182 "not start with refs/.", rs[i].dst);
183 }
184 break;
185 default:
186 errs = 1;
187 error("dst refspec %s matches more than one.",
188 rs[i].dst);
189 break;
190 }
191 if (errs)
192 continue;
193 if (matched_src->peer_ref) {
194 errs = 1;
195 error("src ref %s is sent to more than one dst.",
196 matched_src->name);
197 }
198 else
199 matched_src->peer_ref = matched_dst;
200 if (matched_dst->peer_ref) {
201 errs = 1;
202 error("dst ref %s receives from more than one src.",
203 matched_dst->name);
204 }
205 else
206 matched_dst->peer_ref = matched_src;
207 }
208 return -errs;
209}
210
211static struct ref *find_ref_by_name(struct ref *list, const char *name)
212{
213 for ( ; list; list = list->next)
214 if (!strcmp(list->name, name))
215 return list;
216 return NULL;
217}
218
219int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
220 int nr_refspec, char **refspec, int all)
221{
222 struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
223
224 if (nr_refspec)
225 return match_explicit_refs(src, dst, dst_tail, rs);
226
227 /* pick the remainder */
228 for ( ; src; src = src->next) {
229 struct ref *dst_peer;
230 if (src->peer_ref)
231 continue;
232 dst_peer = find_ref_by_name(dst, src->name);
233 if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
234 continue;
235 if (!dst_peer) {
236 /* Create a new one and link it */
237 int len = strlen(src->name) + 1;
238 dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
239 memcpy(dst_peer->name, src->name, len);
240 memcpy(dst_peer->new_sha1, src->new_sha1, 20);
241 link_dst_tail(dst_peer, dst_tail);
242 }
243 dst_peer->peer_ref = src;
244 }
245 return 0;
246}
247
248enum protocol {
249 PROTO_LOCAL = 1,
250 PROTO_SSH,
251 PROTO_GIT,
252};
253
254static enum protocol get_protocol(const char *name)
255{
256 if (!strcmp(name, "ssh"))
257 return PROTO_SSH;
258 if (!strcmp(name, "git"))
259 return PROTO_GIT;
260 die("I don't handle protocol '%s'", name);
261}
262
263#define STR_(s) # s
264#define STR(s) STR_(s)
265
266static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
267{
268 int sockfd = -1;
269 char *colon, *end;
270 char *port = STR(DEFAULT_GIT_PORT);
271 struct addrinfo hints, *ai0, *ai;
272 int gai;
273
274 if (host[0] == '[') {
275 end = strchr(host + 1, ']');
276 if (end) {
277 *end = 0;
278 end++;
279 host++;
280 } else
281 end = host;
282 } else
283 end = host;
284 colon = strchr(end, ':');
285
286 if (colon) {
287 *colon = 0;
288 port = colon + 1;
289 }
290
291 memset(&hints, 0, sizeof(hints));
292 hints.ai_socktype = SOCK_STREAM;
293 hints.ai_protocol = IPPROTO_TCP;
294
295 gai = getaddrinfo(host, port, &hints, &ai);
296 if (gai)
297 die("Unable to look up %s (%s)", host, gai_strerror(gai));
298
299 for (ai0 = ai; ai; ai = ai->ai_next) {
300 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
301 if (sockfd < 0)
302 continue;
303 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
304 close(sockfd);
305 sockfd = -1;
306 continue;
307 }
308 break;
309 }
310
311 freeaddrinfo(ai0);
312
313 if (sockfd < 0)
314 die("unable to connect a socket (%s)", strerror(errno));
315
316 fd[0] = sockfd;
317 fd[1] = sockfd;
318 packet_write(sockfd, "%s %s\n", prog, path);
319 return 0;
320}
321
322/*
323 * Yeah, yeah, fixme. Need to pass in the heads etc.
324 */
325int git_connect(int fd[2], char *url, const char *prog)
326{
327 char command[1024];
328 char *host, *path;
329 char *colon;
330 int pipefd[2][2];
331 pid_t pid;
332 enum protocol protocol;
333
334 host = NULL;
335 path = url;
336 colon = strchr(url, ':');
337 protocol = PROTO_LOCAL;
338 if (colon) {
339 *colon = 0;
340 host = url;
341 path = colon+1;
342 protocol = PROTO_SSH;
343 if (!memcmp(path, "//", 2)) {
344 char *slash = strchr(path + 2, '/');
345 if (slash) {
346 int nr = slash - path - 2;
347 memmove(path, path+2, nr);
348 path[nr] = 0;
349 protocol = get_protocol(url);
350 host = path;
351 path = slash;
352 }
353 }
354 }
355
356 if (protocol == PROTO_GIT)
357 return git_tcp_connect(fd, prog, host, path);
358
359 if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
360 die("unable to create pipe pair for communication");
361 pid = fork();
362 if (!pid) {
363 snprintf(command, sizeof(command), "%s %s", prog,
364 sq_quote(path));
365 dup2(pipefd[1][0], 0);
366 dup2(pipefd[0][1], 1);
367 close(pipefd[0][0]);
368 close(pipefd[0][1]);
369 close(pipefd[1][0]);
370 close(pipefd[1][1]);
371 if (protocol == PROTO_SSH)
372 execlp("ssh", "ssh", host, command, NULL);
373 else
374 execlp("sh", "sh", "-c", command, NULL);
375 die("exec failed");
376 }
377 fd[0] = pipefd[0][0];
378 fd[1] = pipefd[1][1];
379 close(pipefd[0][1]);
380 close(pipefd[1][0]);
381 return pid;
382}
383
384int finish_connect(pid_t pid)
385{
386 int ret;
387
388 for (;;) {
389 ret = waitpid(pid, NULL, 0);
390 if (!ret)
391 break;
392 if (errno != EINTR)
393 break;
394 }
395 return ret;
396}