connect.c

   1 #include "git-compat-util.h"
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "pkt-line.h"
   5 #include "quote.h"
   6 #include "refs.h"
   7 #include "run-command.h"
   8 #include "remote.h"
   9 #include "connect.h"
  10 #include "url.h"
  11 #include "string-list.h"
  12 #include "oid-array.h"
  13 #include "transport.h"
  14 #include "strbuf.h"
  15 #include "version.h"
  16 #include "protocol.h"
  17 #include "alias.h"
  18
  19 static char *server_capabilities_v1;
  20 static struct argv_array server_capabilities_v2 = ARGV_ARRAY_INIT;
  21 static const char *next_server_feature_value(const char *feature, int *len, int *offset);
  22
  23 static int check_ref(const char *name, unsigned int flags)
  24 {
  25         if (!flags)
  26                 return 1;
  27
  28         if (!skip_prefix(name, "refs/", &name))
  29                 return 0;
  30
  31         /* REF_NORMAL means that we don't want the magic fake tag refs */
  32         if ((flags & REF_NORMAL) && check_refname_format(name, 0))
  33                 return 0;
  34
  35         /* REF_HEADS means that we want regular branch heads */
  36         if ((flags & REF_HEADS) && starts_with(name, "heads/"))
  37                 return 1;
  38
  39         /* REF_TAGS means that we want tags */
  40         if ((flags & REF_TAGS) && starts_with(name, "tags/"))
  41                 return 1;
  42
  43         /* All type bits clear means that we are ok with anything */
  44         return !(flags & ~REF_NORMAL);
  45 }
  46
  47 int check_ref_type(const struct ref *ref, int flags)
  48 {
  49         return check_ref(ref->name, flags);
  50 }
  51
  52 static NORETURN void die_initial_contact(int unexpected)
  53 {
  54         /*
  55          * A hang-up after seeing some response from the other end
  56          * means that it is unexpected, as we know the other end is
  57          * willing to talk to us.  A hang-up before seeing any
  58          * response does not necessarily mean an ACL problem, though.
  59          */
  60         if (unexpected)
  61                 die(_("the remote end hung up upon initial contact"));
  62         else
  63                 die(_("Could not read from remote repository.\n\n"
  64                       "Please make sure you have the correct access rights\n"
  65                       "and the repository exists."));
  66 }
  67
  68 /* Checks if the server supports the capability 'c' */
  69 int server_supports_v2(const char *c, int die_on_error)
  70 {
  71         int i;
  72
  73         for (i = 0; i < server_capabilities_v2.argc; i++) {
  74                 const char *out;
  75                 if (skip_prefix(server_capabilities_v2.argv[i], c, &out) &&
  76                     (!*out || *out == '='))
  77                         return 1;
  78         }
  79
  80         if (die_on_error)
  81                 die(_("server doesn't support '%s'"), c);
  82
  83         return 0;
  84 }
  85
  86 int server_feature_v2(const char *c, const char **v)
  87 {
  88         int i;
  89
  90         for (i = 0; i < server_capabilities_v2.argc; i++) {
  91                 const char *out;
  92                 if (skip_prefix(server_capabilities_v2.argv[i], c, &out) &&
  93                     (*out == '=')) {
  94                         *v = out + 1;
  95                         return 1;
  96                 }
  97         }
  98         return 0;
  99 }
 100
 101 int server_supports_feature(const char *c, const char *feature,
 102                             int die_on_error)
 103 {
 104         int i;
 105
 106         for (i = 0; i < server_capabilities_v2.argc; i++) {
 107                 const char *out;
 108                 if (skip_prefix(server_capabilities_v2.argv[i], c, &out) &&
 109                     (!*out || *(out++) == '=')) {
 110                         if (parse_feature_request(out, feature))
 111                                 return 1;
 112                         else
 113                                 break;
 114                 }
 115         }
 116
 117         if (die_on_error)
 118                 die(_("server doesn't support feature '%s'"), feature);
 119
 120         return 0;
 121 }
 122
 123 static void process_capabilities_v2(struct packet_reader *reader)
 124 {
 125         while (packet_reader_read(reader) == PACKET_READ_NORMAL)
 126                 argv_array_push(&server_capabilities_v2, reader->line);
 127
 128         if (reader->status != PACKET_READ_FLUSH)
 129                 die(_("expected flush after capabilities"));
 130 }
 131
 132 enum protocol_version discover_version(struct packet_reader *reader)
 133 {
 134         enum protocol_version version = protocol_unknown_version;
 135
 136         /*
 137          * Peek the first line of the server's response to
 138          * determine the protocol version the server is speaking.
 139          */
 140         switch (packet_reader_peek(reader)) {
 141         case PACKET_READ_EOF:
 142                 die_initial_contact(0);
 143         case PACKET_READ_FLUSH:
 144         case PACKET_READ_DELIM:
 145                 version = protocol_v0;
 146                 break;
 147         case PACKET_READ_NORMAL:
 148                 version = determine_protocol_version_client(reader->line);
 149                 break;
 150         }
 151
 152         switch (version) {
 153         case protocol_v2:
 154                 process_capabilities_v2(reader);
 155                 break;
 156         case protocol_v1:
 157                 /* Read the peeked version line */
 158                 packet_reader_read(reader);
 159                 break;
 160         case protocol_v0:
 161                 break;
 162         case protocol_unknown_version:
 163                 BUG("unknown protocol version");
 164         }
 165
 166         return version;
 167 }
 168
 169 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
 170 {
 171         char *sym, *target;
 172         struct string_list_item *item;
 173
 174         if (!len)
 175                 return; /* just "symref" */
 176         /* e.g. "symref=HEAD:refs/heads/master" */
 177         sym = xmemdupz(val, len);
 178         target = strchr(sym, ':');
 179         if (!target)
 180                 /* just "symref=something" */
 181                 goto reject;
 182         *(target++) = '\0';
 183         if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
 184             check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
 185                 /* "symref=bogus:pair */
 186                 goto reject;
 187         item = string_list_append_nodup(symref, sym);
 188         item->util = target;
 189         return;
 190 reject:
 191         free(sym);
 192         return;
 193 }
 194
 195 static void annotate_refs_with_symref_info(struct ref *ref)
 196 {
 197         struct string_list symref = STRING_LIST_INIT_DUP;
 198         int offset = 0;
 199
 200         while (1) {
 201                 int len;
 202                 const char *val;
 203
 204                 val = next_server_feature_value("symref", &len, &offset);
 205                 if (!val)
 206                         break;
 207                 parse_one_symref_info(&symref, val, len);
 208         }
 209         string_list_sort(&symref);
 210
 211         for (; ref; ref = ref->next) {
 212                 struct string_list_item *item;
 213                 item = string_list_lookup(&symref, ref->name);
 214                 if (!item)
 215                         continue;
 216                 ref->symref = xstrdup((char *)item->util);
 217         }
 218         string_list_clear(&symref, 0);
 219 }
 220
 221 static void process_capabilities(struct packet_reader *reader, int *linelen)
 222 {
 223         const char *feat_val;
 224         int feat_len;
 225         const char *line = reader->line;
 226         int nul_location = strlen(line);
 227         if (nul_location == *linelen)
 228                 return;
 229         server_capabilities_v1 = xstrdup(line + nul_location + 1);
 230         *linelen = nul_location;
 231
 232         feat_val = server_feature_value("object-format", &feat_len);
 233         if (feat_val) {
 234                 char *hash_name = xstrndup(feat_val, feat_len);
 235                 int hash_algo = hash_algo_by_name(hash_name);
 236                 if (hash_algo != GIT_HASH_UNKNOWN)
 237                         reader->hash_algo = &hash_algos[hash_algo];
 238                 free(hash_name);
 239         } else {
 240                 reader->hash_algo = &hash_algos[GIT_HASH_SHA1];
 241         }
 242 }
 243
 244 static int process_dummy_ref(const struct packet_reader *reader)
 245 {
 246         const char *line = reader->line;
 247         struct object_id oid;
 248         const char *name;
 249
 250         if (parse_oid_hex_algop(line, &oid, &name, reader->hash_algo))
 251                 return 0;
 252         if (*name != ' ')
 253                 return 0;
 254         name++;
 255
 256         return oideq(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
 257 }
 258
 259 static void check_no_capabilities(const char *line, int len)
 260 {
 261         if (strlen(line) != len)
 262                 warning(_("ignoring capabilities after first line '%s'"),
 263                         line + strlen(line));
 264 }
 265
 266 static int process_ref(const struct packet_reader *reader, int len,
 267                        struct ref ***list, unsigned int flags,
 268                        struct oid_array *extra_have)
 269 {
 270         const char *line = reader->line;
 271         struct object_id old_oid;
 272         const char *name;
 273
 274         if (parse_oid_hex_algop(line, &old_oid, &name, reader->hash_algo))
 275                 return 0;
 276         if (*name != ' ')
 277                 return 0;
 278         name++;
 279
 280         if (extra_have && !strcmp(name, ".have")) {
 281                 oid_array_append(extra_have, &old_oid);
 282         } else if (!strcmp(name, "capabilities^{}")) {
 283                 die(_("protocol error: unexpected capabilities^{}"));
 284         } else if (check_ref(name, flags)) {
 285                 struct ref *ref = alloc_ref(name);
 286                 oidcpy(&ref->old_oid, &old_oid);
 287                 **list = ref;
 288                 *list = &ref->next;
 289         }
 290         check_no_capabilities(line, len);
 291         return 1;
 292 }
 293
 294 static int process_shallow(const struct packet_reader *reader, int len,
 295                            struct oid_array *shallow_points)
 296 {
 297         const char *line = reader->line;
 298         const char *arg;
 299         struct object_id old_oid;
 300
 301         if (!skip_prefix(line, "shallow ", &arg))
 302                 return 0;
 303
 304         if (get_oid_hex_algop(arg, &old_oid, reader->hash_algo))
 305                 die(_("protocol error: expected shallow sha-1, got '%s'"), arg);
 306         if (!shallow_points)
 307                 die(_("repository on the other end cannot be shallow"));
 308         oid_array_append(shallow_points, &old_oid);
 309         check_no_capabilities(line, len);
 310         return 1;
 311 }
 312
 313 enum get_remote_heads_state {
 314         EXPECTING_FIRST_REF = 0,
 315         EXPECTING_REF,
 316         EXPECTING_SHALLOW,
 317         EXPECTING_DONE,
 318 };
 319
 320 /*
 321  * Read all the refs from the other end
 322  */
 323 struct ref **get_remote_heads(struct packet_reader *reader,
 324                               struct ref **list, unsigned int flags,
 325                               struct oid_array *extra_have,
 326                               struct oid_array *shallow_points)
 327 {
 328         struct ref **orig_list = list;
 329         int len = 0;
 330         enum get_remote_heads_state state = EXPECTING_FIRST_REF;
 331
 332         *list = NULL;
 333
 334         while (state != EXPECTING_DONE) {
 335                 switch (packet_reader_read(reader)) {
 336                 case PACKET_READ_EOF:
 337                         die_initial_contact(1);
 338                 case PACKET_READ_NORMAL:
 339                         len = reader->pktlen;
 340                         break;
 341                 case PACKET_READ_FLUSH:
 342                         state = EXPECTING_DONE;
 343                         break;
 344                 case PACKET_READ_DELIM:
 345                         die(_("invalid packet"));
 346                 }
 347
 348                 switch (state) {
 349                 case EXPECTING_FIRST_REF:
 350                         process_capabilities(reader, &len);
 351                         if (process_dummy_ref(reader)) {
 352                                 state = EXPECTING_SHALLOW;
 353                                 break;
 354                         }
 355                         state = EXPECTING_REF;
 356                         /* fallthrough */
 357                 case EXPECTING_REF:
 358                         if (process_ref(reader, len, &list, flags, extra_have))
 359                                 break;
 360                         state = EXPECTING_SHALLOW;
 361                         /* fallthrough */
 362                 case EXPECTING_SHALLOW:
 363                         if (process_shallow(reader, len, shallow_points))
 364                                 break;
 365                         die(_("protocol error: unexpected '%s'"), reader->line);
 366                 case EXPECTING_DONE:
 367                         break;
 368                 }
 369         }
 370
 371         annotate_refs_with_symref_info(*orig_list);
 372
 373         return list;
 374 }
 375
 376 /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */
 377 static int process_ref_v2(struct packet_reader *reader, struct ref ***list)
 378 {
 379         int ret = 1;
 380         int i = 0;
 381         struct object_id old_oid;
 382         struct ref *ref;
 383         struct string_list line_sections = STRING_LIST_INIT_DUP;
 384         const char *end;
 385         const char *line = reader->line;
 386
 387         /*
 388          * Ref lines have a number of fields which are space deliminated.  The
 389          * first field is the OID of the ref.  The second field is the ref
 390          * name.  Subsequent fields (symref-target and peeled) are optional and
 391          * don't have a particular order.
 392          */
 393         if (string_list_split(&line_sections, line, ' ', -1) < 2) {
 394                 ret = 0;
 395                 goto out;
 396         }
 397
 398         if (parse_oid_hex_algop(line_sections.items[i++].string, &old_oid, &end, reader->hash_algo) ||
 399             *end) {
 400                 ret = 0;
 401                 goto out;
 402         }
 403
 404         ref = alloc_ref(line_sections.items[i++].string);
 405
 406         memcpy(ref->old_oid.hash, old_oid.hash, reader->hash_algo->rawsz);
 407         **list = ref;
 408         *list = &ref->next;
 409
 410         for (; i < line_sections.nr; i++) {
 411                 const char *arg = line_sections.items[i].string;
 412                 if (skip_prefix(arg, "symref-target:", &arg))
 413                         ref->symref = xstrdup(arg);
 414
 415                 if (skip_prefix(arg, "peeled:", &arg)) {
 416                         struct object_id peeled_oid;
 417                         char *peeled_name;
 418                         struct ref *peeled;
 419                         if (parse_oid_hex_algop(arg, &peeled_oid, &end,
 420                                                 reader->hash_algo) || *end) {
 421                                 ret = 0;
 422                                 goto out;
 423                         }
 424
 425                         peeled_name = xstrfmt("%s^{}", ref->name);
 426                         peeled = alloc_ref(peeled_name);
 427
 428                         memcpy(peeled->old_oid.hash, peeled_oid.hash,
 429                                reader->hash_algo->rawsz);
 430                         **list = peeled;
 431                         *list = &peeled->next;
 432
 433                         free(peeled_name);
 434                 }
 435         }
 436
 437 out:
 438         string_list_clear(&line_sections, 0);
 439         return ret;
 440 }
 441
 442 struct ref **get_remote_refs(int fd_out, struct packet_reader *reader,
 443                              struct ref **list, int for_push,
 444                              const struct argv_array *ref_prefixes,
 445                              const struct string_list *server_options)
 446 {
 447         int i;
 448         const char *hash_name;
 449         *list = NULL;
 450
 451         if (server_supports_v2("ls-refs", 1))
 452                 packet_write_fmt(fd_out, "command=ls-refs\n");
 453
 454         if (server_supports_v2("agent", 0))
 455                 packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized());
 456
 457         if (server_feature_v2("object-format", &hash_name)) {
 458                 int hash_algo = hash_algo_by_name(hash_name);
 459                 if (hash_algo == GIT_HASH_UNKNOWN)
 460                         die(_("unknown object format '%s' specified by server"), hash_name);
 461                 reader->hash_algo = &hash_algos[hash_algo];
 462                 packet_write_fmt(fd_out, "object-format=%s", reader->hash_algo->name);
 463         }
 464
 465         if (server_options && server_options->nr &&
 466             server_supports_v2("server-option", 1))
 467                 for (i = 0; i < server_options->nr; i++)
 468                         packet_write_fmt(fd_out, "server-option=%s",
 469                                          server_options->items[i].string);
 470
 471         packet_delim(fd_out);
 472         /* When pushing we don't want to request the peeled tags */
 473         if (!for_push)
 474                 packet_write_fmt(fd_out, "peel\n");
 475         packet_write_fmt(fd_out, "symrefs\n");
 476         for (i = 0; ref_prefixes && i < ref_prefixes->argc; i++) {
 477                 packet_write_fmt(fd_out, "ref-prefix %s\n",
 478                                  ref_prefixes->argv[i]);
 479         }
 480         packet_flush(fd_out);
 481
 482         /* Process response from server */
 483         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
 484                 if (!process_ref_v2(reader, &list))
 485                         die(_("invalid ls-refs response: %s"), reader->line);
 486         }
 487
 488         if (reader->status != PACKET_READ_FLUSH)
 489                 die(_("expected flush after ref listing"));
 490
 491         return list;
 492 }
 493
 494 const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp, int *offset)
 495 {
 496         int len;
 497
 498         if (!feature_list)
 499                 return NULL;
 500
 501         len = strlen(feature);
 502         if (offset)
 503                 feature_list += *offset;
 504         while (*feature_list) {
 505                 const char *found = strstr(feature_list, feature);
 506                 if (!found)
 507                         return NULL;
 508                 if (feature_list == found || isspace(found[-1])) {
 509                         const char *value = found + len;
 510                         /* feature with no value (e.g., "thin-pack") */
 511                         if (!*value || isspace(*value)) {
 512                                 if (lenp)
 513                                         *lenp = 0;
 514                                 return value;
 515                         }
 516                         /* feature with a value (e.g., "agent=git/1.2.3") */
 517                         else if (*value == '=') {
 518                                 int end;
 519
 520                                 value++;
 521                                 end = strcspn(value, " \t\n");
 522                                 if (lenp)
 523                                         *lenp = end;
 524                                 if (offset)
 525                                         *offset = value + end - feature_list;
 526                                 return value;
 527                         }
 528                         /*
 529                          * otherwise we matched a substring of another feature;
 530                          * keep looking
 531                          */
 532                 }
 533                 feature_list = found + 1;
 534         }
 535         return NULL;
 536 }
 537
 538 int server_supports_hash(const char *desired, int *feature_supported)
 539 {
 540         int offset = 0;
 541         int len;
 542         const char *hash;
 543
 544         hash = next_server_feature_value("object-format", &len, &offset);
 545         if (feature_supported)
 546                 *feature_supported = !!hash;
 547         if (!hash) {
 548                 hash = hash_algos[GIT_HASH_SHA1].name;
 549                 len = strlen(hash);
 550         }
 551         while (hash) {
 552                 if (!xstrncmpz(desired, hash, len))
 553                         return 1;
 554
 555                 hash = next_server_feature_value("object-format", &len, &offset);
 556         }
 557         return 0;
 558 }
 559
 560 int parse_feature_request(const char *feature_list, const char *feature)
 561 {
 562         return !!parse_feature_value(feature_list, feature, NULL, NULL);
 563 }
 564
 565 static const char *next_server_feature_value(const char *feature, int *len, int *offset)
 566 {
 567         return parse_feature_value(server_capabilities_v1, feature, len, offset);
 568 }
 569
 570 const char *server_feature_value(const char *feature, int *len)
 571 {
 572         return parse_feature_value(server_capabilities_v1, feature, len, NULL);
 573 }
 574
 575 int server_supports(const char *feature)
 576 {
 577         return !!server_feature_value(feature, NULL);
 578 }
 579
 580 enum protocol {
 581         PROTO_LOCAL = 1,
 582         PROTO_FILE,
 583         PROTO_SSH,
 584         PROTO_GIT
 585 };
 586
 587 int url_is_local_not_ssh(const char *url)
 588 {
 589         const char *colon = strchr(url, ':');
 590         const char *slash = strchr(url, '/');
 591         return !colon || (slash && slash < colon) ||
 592                 (has_dos_drive_prefix(url) && is_valid_path(url));
 593 }
 594
 595 static const char *prot_name(enum protocol protocol)
 596 {
 597         switch (protocol) {
 598                 case PROTO_LOCAL:
 599                 case PROTO_FILE:
 600                         return "file";
 601                 case PROTO_SSH:
 602                         return "ssh";
 603                 case PROTO_GIT:
 604                         return "git";
 605                 default:
 606                         return "unknown protocol";
 607         }
 608 }
 609
 610 static enum protocol get_protocol(const char *name)
 611 {
 612         if (!strcmp(name, "ssh"))
 613                 return PROTO_SSH;
 614         if (!strcmp(name, "git"))
 615                 return PROTO_GIT;
 616         if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
 617                 return PROTO_SSH;
 618         if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
 619                 return PROTO_SSH;
 620         if (!strcmp(name, "file"))
 621                 return PROTO_FILE;
 622         die(_("protocol '%s' is not supported"), name);
 623 }
 624
 625 static char *host_end(char **hoststart, int removebrackets)
 626 {
 627         char *host = *hoststart;
 628         char *end;
 629         char *start = strstr(host, "@[");
 630         if (start)
 631                 start++; /* Jump over '@' */
 632         else
 633                 start = host;
 634         if (start[0] == '[') {
 635                 end = strchr(start + 1, ']');
 636                 if (end) {
 637                         if (removebrackets) {
 638                                 *end = 0;
 639                                 memmove(start, start + 1, end - start);
 640                                 end++;
 641                         }
 642                 } else
 643                         end = host;
 644         } else
 645                 end = host;
 646         return end;
 647 }
 648
 649 #define STR_(s) # s
 650 #define STR(s)  STR_(s)
 651
 652 static void get_host_and_port(char **host, const char **port)
 653 {
 654         char *colon, *end;
 655         end = host_end(host, 1);
 656         colon = strchr(end, ':');
 657         if (colon) {
 658                 long portnr = strtol(colon + 1, &end, 10);
 659                 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
 660                         *colon = 0;
 661                         *port = colon + 1;
 662                 } else if (!colon[1]) {
 663                         *colon = 0;
 664                 }
 665         }
 666 }
 667
 668 static void enable_keepalive(int sockfd)
 669 {
 670         int ka = 1;
 671
 672         if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
 673                 error_errno(_("unable to set SO_KEEPALIVE on socket"));
 674 }
 675
 676 #ifndef NO_IPV6
 677
 678 static const char *ai_name(const struct addrinfo *ai)
 679 {
 680         static char addr[NI_MAXHOST];
 681         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 682                         NI_NUMERICHOST) != 0)
 683                 xsnprintf(addr, sizeof(addr), "(unknown)");
 684
 685         return addr;
 686 }
 687
 688 /*
 689  * Returns a connected socket() fd, or else die()s.
 690  */
 691 static int git_tcp_connect_sock(char *host, int flags)
 692 {
 693         struct strbuf error_message = STRBUF_INIT;
 694         int sockfd = -1;
 695         const char *port = STR(DEFAULT_GIT_PORT);
 696         struct addrinfo hints, *ai0, *ai;
 697         int gai;
 698         int cnt = 0;
 699
 700         get_host_and_port(&host, &port);
 701         if (!*port)
 702                 port = "<none>";
 703
 704         memset(&hints, 0, sizeof(hints));
 705         if (flags & CONNECT_IPV4)
 706                 hints.ai_family = AF_INET;
 707         else if (flags & CONNECT_IPV6)
 708                 hints.ai_family = AF_INET6;
 709         hints.ai_socktype = SOCK_STREAM;
 710         hints.ai_protocol = IPPROTO_TCP;
 711
 712         if (flags & CONNECT_VERBOSE)
 713                 fprintf(stderr, _("Looking up %s ... "), host);
 714
 715         gai = getaddrinfo(host, port, &hints, &ai);
 716         if (gai)
 717                 die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai));
 718
 719         if (flags & CONNECT_VERBOSE)
 720                 /* TRANSLATORS: this is the end of "Looking up %s ... " */
 721                 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
 722
 723         for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 724                 sockfd = socket(ai->ai_family,
 725                                 ai->ai_socktype, ai->ai_protocol);
 726                 if ((sockfd < 0) ||
 727                     (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 728                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 729                                     host, cnt, ai_name(ai), strerror(errno));
 730                         if (0 <= sockfd)
 731                                 close(sockfd);
 732                         sockfd = -1;
 733                         continue;
 734                 }
 735                 if (flags & CONNECT_VERBOSE)
 736                         fprintf(stderr, "%s ", ai_name(ai));
 737                 break;
 738         }
 739
 740         freeaddrinfo(ai0);
 741
 742         if (sockfd < 0)
 743                 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
 744
 745         enable_keepalive(sockfd);
 746
 747         if (flags & CONNECT_VERBOSE)
 748                 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
 749                 fprintf_ln(stderr, _("done."));
 750
 751         strbuf_release(&error_message);
 752
 753         return sockfd;
 754 }
 755
 756 #else /* NO_IPV6 */
 757
 758 /*
 759  * Returns a connected socket() fd, or else die()s.
 760  */
 761 static int git_tcp_connect_sock(char *host, int flags)
 762 {
 763         struct strbuf error_message = STRBUF_INIT;
 764         int sockfd = -1;
 765         const char *port = STR(DEFAULT_GIT_PORT);
 766         char *ep;
 767         struct hostent *he;
 768         struct sockaddr_in sa;
 769         char **ap;
 770         unsigned int nport;
 771         int cnt;
 772
 773         get_host_and_port(&host, &port);
 774
 775         if (flags & CONNECT_VERBOSE)
 776                 fprintf(stderr, _("Looking up %s ... "), host);
 777
 778         he = gethostbyname(host);
 779         if (!he)
 780                 die(_("unable to look up %s (%s)"), host, hstrerror(h_errno));
 781         nport = strtoul(port, &ep, 10);
 782         if ( ep == port || *ep ) {
 783                 /* Not numeric */
 784                 struct servent *se = getservbyname(port,"tcp");
 785                 if ( !se )
 786                         die(_("unknown port %s"), port);
 787                 nport = se->s_port;
 788         }
 789
 790         if (flags & CONNECT_VERBOSE)
 791                 /* TRANSLATORS: this is the end of "Looking up %s ... " */
 792                 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
 793
 794         for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 795                 memset(&sa, 0, sizeof sa);
 796                 sa.sin_family = he->h_addrtype;
 797                 sa.sin_port = htons(nport);
 798                 memcpy(&sa.sin_addr, *ap, he->h_length);
 799
 800                 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 801                 if ((sockfd < 0) ||
 802                     connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 803                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 804                                 host,
 805                                 cnt,
 806                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 807                                 strerror(errno));
 808                         if (0 <= sockfd)
 809                                 close(sockfd);
 810                         sockfd = -1;
 811                         continue;
 812                 }
 813                 if (flags & CONNECT_VERBOSE)
 814                         fprintf(stderr, "%s ",
 815                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 816                 break;
 817         }
 818
 819         if (sockfd < 0)
 820                 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
 821
 822         enable_keepalive(sockfd);
 823
 824         if (flags & CONNECT_VERBOSE)
 825                 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
 826                 fprintf_ln(stderr, _("done."));
 827
 828         return sockfd;
 829 }
 830
 831 #endif /* NO_IPV6 */
 832
 833
 834 /*
 835  * Dummy child_process returned by git_connect() if the transport protocol
 836  * does not need fork(2).
 837  */
 838 static struct child_process no_fork = CHILD_PROCESS_INIT;
 839
 840 int git_connection_is_socket(struct child_process *conn)
 841 {
 842         return conn == &no_fork;
 843 }
 844
 845 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
 846 {
 847         int sockfd = git_tcp_connect_sock(host, flags);
 848
 849         fd[0] = sockfd;
 850         fd[1] = dup(sockfd);
 851
 852         return &no_fork;
 853 }
 854
 855
 856 static char *git_proxy_command;
 857
 858 static int git_proxy_command_options(const char *var, const char *value,
 859                 void *cb)
 860 {
 861         if (!strcmp(var, "core.gitproxy")) {
 862                 const char *for_pos;
 863                 int matchlen = -1;
 864                 int hostlen;
 865                 const char *rhost_name = cb;
 866                 int rhost_len = strlen(rhost_name);
 867
 868                 if (git_proxy_command)
 869                         return 0;
 870                 if (!value)
 871                         return config_error_nonbool(var);
 872                 /* [core]
 873                  * ;# matches www.kernel.org as well
 874                  * gitproxy = netcatter-1 for kernel.org
 875                  * gitproxy = netcatter-2 for sample.xz
 876                  * gitproxy = netcatter-default
 877                  */
 878                 for_pos = strstr(value, " for ");
 879                 if (!for_pos)
 880                         /* matches everybody */
 881                         matchlen = strlen(value);
 882                 else {
 883                         hostlen = strlen(for_pos + 5);
 884                         if (rhost_len < hostlen)
 885                                 matchlen = -1;
 886                         else if (!strncmp(for_pos + 5,
 887                                           rhost_name + rhost_len - hostlen,
 888                                           hostlen) &&
 889                                  ((rhost_len == hostlen) ||
 890                                   rhost_name[rhost_len - hostlen -1] == '.'))
 891                                 matchlen = for_pos - value;
 892                         else
 893                                 matchlen = -1;
 894                 }
 895                 if (0 <= matchlen) {
 896                         /* core.gitproxy = none for kernel.org */
 897                         if (matchlen == 4 &&
 898                             !memcmp(value, "none", 4))
 899                                 matchlen = 0;
 900                         git_proxy_command = xmemdupz(value, matchlen);
 901                 }
 902                 return 0;
 903         }
 904
 905         return git_default_config(var, value, cb);
 906 }
 907
 908 static int git_use_proxy(const char *host)
 909 {
 910         git_proxy_command = getenv("GIT_PROXY_COMMAND");
 911         git_config(git_proxy_command_options, (void*)host);
 912         return (git_proxy_command && *git_proxy_command);
 913 }
 914
 915 static struct child_process *git_proxy_connect(int fd[2], char *host)
 916 {
 917         const char *port = STR(DEFAULT_GIT_PORT);
 918         struct child_process *proxy;
 919
 920         get_host_and_port(&host, &port);
 921
 922         if (looks_like_command_line_option(host))
 923                 die(_("strange hostname '%s' blocked"), host);
 924         if (looks_like_command_line_option(port))
 925                 die(_("strange port '%s' blocked"), port);
 926
 927         proxy = xmalloc(sizeof(*proxy));
 928         child_process_init(proxy);
 929         argv_array_push(&proxy->args, git_proxy_command);
 930         argv_array_push(&proxy->args, host);
 931         argv_array_push(&proxy->args, port);
 932         proxy->in = -1;
 933         proxy->out = -1;
 934         if (start_command(proxy))
 935                 die(_("cannot start proxy %s"), git_proxy_command);
 936         fd[0] = proxy->out; /* read from proxy stdout */
 937         fd[1] = proxy->in;  /* write to proxy stdin */
 938         return proxy;
 939 }
 940
 941 static char *get_port(char *host)
 942 {
 943         char *end;
 944         char *p = strchr(host, ':');
 945
 946         if (p) {
 947                 long port = strtol(p + 1, &end, 10);
 948                 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 949                         *p = '\0';
 950                         return p+1;
 951                 }
 952         }
 953
 954         return NULL;
 955 }
 956
 957 /*
 958  * Extract protocol and relevant parts from the specified connection URL.
 959  * The caller must free() the returned strings.
 960  */
 961 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
 962                                        char **ret_path)
 963 {
 964         char *url;
 965         char *host, *path;
 966         char *end;
 967         int separator = '/';
 968         enum protocol protocol = PROTO_LOCAL;
 969
 970         if (is_url(url_orig))
 971                 url = url_decode(url_orig);
 972         else
 973                 url = xstrdup(url_orig);
 974
 975         host = strstr(url, "://");
 976         if (host) {
 977                 *host = '\0';
 978                 protocol = get_protocol(url);
 979                 host += 3;
 980         } else {
 981                 host = url;
 982                 if (!url_is_local_not_ssh(url)) {
 983                         protocol = PROTO_SSH;
 984                         separator = ':';
 985                 }
 986         }
 987
 988         /*
 989          * Don't do destructive transforms as protocol code does
 990          * '[]' unwrapping in get_host_and_port()
 991          */
 992         end = host_end(&host, 0);
 993
 994         if (protocol == PROTO_LOCAL)
 995                 path = end;
 996         else if (protocol == PROTO_FILE && *host != '/' &&
 997                  !has_dos_drive_prefix(host) &&
 998                  offset_1st_component(host - 2) > 1)
 999                 path = host - 2; /* include the leading "//" */
1000         else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
1001                 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
1002         else
1003                 path = strchr(end, separator);
1004
1005         if (!path || !*path)
1006                 die(_("no path specified; see 'git help pull' for valid url syntax"));
1007
1008         /*
1009          * null-terminate hostname and point path to ~ for URL's like this:
1010          *    ssh://host.xz/~user/repo
1011          */
1012
1013         end = path; /* Need to \0 terminate host here */
1014         if (separator == ':')
1015                 path++; /* path starts after ':' */
1016         if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
1017                 if (path[1] == '~')
1018                         path++;
1019         }
1020
1021         path = xstrdup(path);
1022         *end = '\0';
1023
1024         *ret_host = xstrdup(host);
1025         *ret_path = path;
1026         free(url);
1027         return protocol;
1028 }
1029
1030 static const char *get_ssh_command(void)
1031 {
1032         const char *ssh;
1033
1034         if ((ssh = getenv("GIT_SSH_COMMAND")))
1035                 return ssh;
1036
1037         if (!git_config_get_string_const("core.sshcommand", &ssh))
1038                 return ssh;
1039
1040         return NULL;
1041 }
1042
1043 enum ssh_variant {
1044         VARIANT_AUTO,
1045         VARIANT_SIMPLE,
1046         VARIANT_SSH,
1047         VARIANT_PLINK,
1048         VARIANT_PUTTY,
1049         VARIANT_TORTOISEPLINK,
1050 };
1051
1052 static void override_ssh_variant(enum ssh_variant *ssh_variant)
1053 {
1054         const char *variant = getenv("GIT_SSH_VARIANT");
1055
1056         if (!variant && git_config_get_string_const("ssh.variant", &variant))
1057                 return;
1058
1059         if (!strcmp(variant, "auto"))
1060                 *ssh_variant = VARIANT_AUTO;
1061         else if (!strcmp(variant, "plink"))
1062                 *ssh_variant = VARIANT_PLINK;
1063         else if (!strcmp(variant, "putty"))
1064                 *ssh_variant = VARIANT_PUTTY;
1065         else if (!strcmp(variant, "tortoiseplink"))
1066                 *ssh_variant = VARIANT_TORTOISEPLINK;
1067         else if (!strcmp(variant, "simple"))
1068                 *ssh_variant = VARIANT_SIMPLE;
1069         else
1070                 *ssh_variant = VARIANT_SSH;
1071 }
1072
1073 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
1074                                               int is_cmdline)
1075 {
1076         enum ssh_variant ssh_variant = VARIANT_AUTO;
1077         const char *variant;
1078         char *p = NULL;
1079
1080         override_ssh_variant(&ssh_variant);
1081
1082         if (ssh_variant != VARIANT_AUTO)
1083                 return ssh_variant;
1084
1085         if (!is_cmdline) {
1086                 p = xstrdup(ssh_command);
1087                 variant = basename(p);
1088         } else {
1089                 const char **ssh_argv;
1090
1091                 p = xstrdup(ssh_command);
1092                 if (split_cmdline(p, &ssh_argv) > 0) {
1093                         variant = basename((char *)ssh_argv[0]);
1094                         /*
1095                          * At this point, variant points into the buffer
1096                          * referenced by p, hence we do not need ssh_argv
1097                          * any longer.
1098                          */
1099                         free(ssh_argv);
1100                 } else {
1101                         free(p);
1102                         return ssh_variant;
1103                 }
1104         }
1105
1106         if (!strcasecmp(variant, "ssh") ||
1107             !strcasecmp(variant, "ssh.exe"))
1108                 ssh_variant = VARIANT_SSH;
1109         else if (!strcasecmp(variant, "plink") ||
1110                  !strcasecmp(variant, "plink.exe"))
1111                 ssh_variant = VARIANT_PLINK;
1112         else if (!strcasecmp(variant, "tortoiseplink") ||
1113                  !strcasecmp(variant, "tortoiseplink.exe"))
1114                 ssh_variant = VARIANT_TORTOISEPLINK;
1115
1116         free(p);
1117         return ssh_variant;
1118 }
1119
1120 /*
1121  * Open a connection using Git's native protocol.
1122  *
1123  * The caller is responsible for freeing hostandport, but this function may
1124  * modify it (for example, to truncate it to remove the port part).
1125  */
1126 static struct child_process *git_connect_git(int fd[2], char *hostandport,
1127                                              const char *path, const char *prog,
1128                                              enum protocol_version version,
1129                                              int flags)
1130 {
1131         struct child_process *conn;
1132         struct strbuf request = STRBUF_INIT;
1133         /*
1134          * Set up virtual host information based on where we will
1135          * connect, unless the user has overridden us in
1136          * the environment.
1137          */
1138         char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
1139         if (target_host)
1140                 target_host = xstrdup(target_host);
1141         else
1142                 target_host = xstrdup(hostandport);
1143
1144         transport_check_allowed("git");
1145
1146         /*
1147          * These underlying connection commands die() if they
1148          * cannot connect.
1149          */
1150         if (git_use_proxy(hostandport))
1151                 conn = git_proxy_connect(fd, hostandport);
1152         else
1153                 conn = git_tcp_connect(fd, hostandport, flags);
1154         /*
1155          * Separate original protocol components prog and path
1156          * from extended host header with a NUL byte.
1157          *
1158          * Note: Do not add any other headers here!  Doing so
1159          * will cause older git-daemon servers to crash.
1160          */
1161         strbuf_addf(&request,
1162                     "%s %s%chost=%s%c",
1163                     prog, path, 0,
1164                     target_host, 0);
1165
1166         /* If using a new version put that stuff here after a second null byte */
1167         if (version > 0) {
1168                 strbuf_addch(&request, '\0');
1169                 strbuf_addf(&request, "version=%d%c",
1170                             version, '\0');
1171         }
1172
1173         packet_write(fd[1], request.buf, request.len);
1174
1175         free(target_host);
1176         strbuf_release(&request);
1177         return conn;
1178 }
1179
1180 /*
1181  * Append the appropriate environment variables to `env` and options to
1182  * `args` for running ssh in Git's SSH-tunneled transport.
1183  */
1184 static void push_ssh_options(struct argv_array *args, struct argv_array *env,
1185                              enum ssh_variant variant, const char *port,
1186                              enum protocol_version version, int flags)
1187 {
1188         if (variant == VARIANT_SSH &&
1189             version > 0) {
1190                 argv_array_push(args, "-o");
1191                 argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
1192                 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1193                                  version);
1194         }
1195
1196         if (flags & CONNECT_IPV4) {
1197                 switch (variant) {
1198                 case VARIANT_AUTO:
1199                         BUG("VARIANT_AUTO passed to push_ssh_options");
1200                 case VARIANT_SIMPLE:
1201                         die(_("ssh variant 'simple' does not support -4"));
1202                 case VARIANT_SSH:
1203                 case VARIANT_PLINK:
1204                 case VARIANT_PUTTY:
1205                 case VARIANT_TORTOISEPLINK:
1206                         argv_array_push(args, "-4");
1207                 }
1208         } else if (flags & CONNECT_IPV6) {
1209                 switch (variant) {
1210                 case VARIANT_AUTO:
1211                         BUG("VARIANT_AUTO passed to push_ssh_options");
1212                 case VARIANT_SIMPLE:
1213                         die(_("ssh variant 'simple' does not support -6"));
1214                 case VARIANT_SSH:
1215                 case VARIANT_PLINK:
1216                 case VARIANT_PUTTY:
1217                 case VARIANT_TORTOISEPLINK:
1218                         argv_array_push(args, "-6");
1219                 }
1220         }
1221
1222         if (variant == VARIANT_TORTOISEPLINK)
1223                 argv_array_push(args, "-batch");
1224
1225         if (port) {
1226                 switch (variant) {
1227                 case VARIANT_AUTO:
1228                         BUG("VARIANT_AUTO passed to push_ssh_options");
1229                 case VARIANT_SIMPLE:
1230                         die(_("ssh variant 'simple' does not support setting port"));
1231                 case VARIANT_SSH:
1232                         argv_array_push(args, "-p");
1233                         break;
1234                 case VARIANT_PLINK:
1235                 case VARIANT_PUTTY:
1236                 case VARIANT_TORTOISEPLINK:
1237                         argv_array_push(args, "-P");
1238                 }
1239
1240                 argv_array_push(args, port);
1241         }
1242 }
1243
1244 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
1245 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
1246                           const char *port, enum protocol_version version,
1247                           int flags)
1248 {
1249         const char *ssh;
1250         enum ssh_variant variant;
1251
1252         if (looks_like_command_line_option(ssh_host))
1253                 die(_("strange hostname '%s' blocked"), ssh_host);
1254
1255         ssh = get_ssh_command();
1256         if (ssh) {
1257                 variant = determine_ssh_variant(ssh, 1);
1258         } else {
1259                 /*
1260                  * GIT_SSH is the no-shell version of
1261                  * GIT_SSH_COMMAND (and must remain so for
1262                  * historical compatibility).
1263                  */
1264                 conn->use_shell = 0;
1265
1266                 ssh = getenv("GIT_SSH");
1267                 if (!ssh)
1268                         ssh = "ssh";
1269                 variant = determine_ssh_variant(ssh, 0);
1270         }
1271
1272         if (variant == VARIANT_AUTO) {
1273                 struct child_process detect = CHILD_PROCESS_INIT;
1274
1275                 detect.use_shell = conn->use_shell;
1276                 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1277
1278                 argv_array_push(&detect.args, ssh);
1279                 argv_array_push(&detect.args, "-G");
1280                 push_ssh_options(&detect.args, &detect.env_array,
1281                                  VARIANT_SSH, port, version, flags);
1282                 argv_array_push(&detect.args, ssh_host);
1283
1284                 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1285         }
1286
1287         argv_array_push(&conn->args, ssh);
1288         push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
1289         argv_array_push(&conn->args, ssh_host);
1290 }
1291
1292 /*
1293  * This returns the dummy child_process `no_fork` if the transport protocol
1294  * does not need fork(2), or a struct child_process object if it does.  Once
1295  * done, finish the connection with finish_connect() with the value returned
1296  * from this function (it is safe to call finish_connect() with NULL to
1297  * support the former case).
1298  *
1299  * If it returns, the connect is successful; it just dies on errors (this
1300  * will hopefully be changed in a libification effort, to return NULL when
1301  * the connection failed).
1302  */
1303 struct child_process *git_connect(int fd[2], const char *url,
1304                                   const char *prog, int flags)
1305 {
1306         char *hostandport, *path;
1307         struct child_process *conn;
1308         enum protocol protocol;
1309         enum protocol_version version = get_protocol_version_config();
1310
1311         /*
1312          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
1313          * to perform a push, then fallback to v0 since the client doesn't know
1314          * how to push yet using v2.
1315          */
1316         if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
1317                 version = protocol_v0;
1318
1319         /* Without this we cannot rely on waitpid() to tell
1320          * what happened to our children.
1321          */
1322         signal(SIGCHLD, SIG_DFL);
1323
1324         protocol = parse_connect_url(url, &hostandport, &path);
1325         if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1326                 printf("Diag: url=%s\n", url ? url : "NULL");
1327                 printf("Diag: protocol=%s\n", prot_name(protocol));
1328                 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1329                 printf("Diag: path=%s\n", path ? path : "NULL");
1330                 conn = NULL;
1331         } else if (protocol == PROTO_GIT) {
1332                 conn = git_connect_git(fd, hostandport, path, prog, version, flags);
1333                 conn->trace2_child_class = "transport/git";
1334         } else {
1335                 struct strbuf cmd = STRBUF_INIT;
1336                 const char *const *var;
1337
1338                 conn = xmalloc(sizeof(*conn));
1339                 child_process_init(conn);
1340
1341                 if (looks_like_command_line_option(path))
1342                         die(_("strange pathname '%s' blocked"), path);
1343
1344                 strbuf_addstr(&cmd, prog);
1345                 strbuf_addch(&cmd, ' ');
1346                 sq_quote_buf(&cmd, path);
1347
1348                 /* remove repo-local variables from the environment */
1349                 for (var = local_repo_env; *var; var++)
1350                         argv_array_push(&conn->env_array, *var);
1351
1352                 conn->use_shell = 1;
1353                 conn->in = conn->out = -1;
1354                 if (protocol == PROTO_SSH) {
1355                         char *ssh_host = hostandport;
1356                         const char *port = NULL;
1357                         transport_check_allowed("ssh");
1358                         get_host_and_port(&ssh_host, &port);
1359
1360                         if (!port)
1361                                 port = get_port(ssh_host);
1362
1363                         if (flags & CONNECT_DIAG_URL) {
1364                                 printf("Diag: url=%s\n", url ? url : "NULL");
1365                                 printf("Diag: protocol=%s\n", prot_name(protocol));
1366                                 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1367                                 printf("Diag: port=%s\n", port ? port : "NONE");
1368                                 printf("Diag: path=%s\n", path ? path : "NULL");
1369
1370                                 free(hostandport);
1371                                 free(path);
1372                                 free(conn);
1373                                 strbuf_release(&cmd);
1374                                 return NULL;
1375                         }
1376                         conn->trace2_child_class = "transport/ssh";
1377                         fill_ssh_args(conn, ssh_host, port, version, flags);
1378                 } else {
1379                         transport_check_allowed("file");
1380                         conn->trace2_child_class = "transport/file";
1381                         if (version > 0) {
1382                                 argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1383                                                  version);
1384                         }
1385                 }
1386                 argv_array_push(&conn->args, cmd.buf);
1387
1388                 if (start_command(conn))
1389                         die(_("unable to fork"));
1390
1391                 fd[0] = conn->out; /* read from child's stdout */
1392                 fd[1] = conn->in;  /* write to child's stdin */
1393                 strbuf_release(&cmd);
1394         }
1395         free(hostandport);
1396         free(path);
1397         return conn;
1398 }
1399
1400 int finish_connect(struct child_process *conn)
1401 {
1402         int code;
1403         if (!conn || git_connection_is_socket(conn))
1404                 return 0;
1405
1406         code = finish_command(conn);
1407         free(conn);
1408         return code;
1409 }