git.oblomov.eu Git - git/blob - 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 strvec server_capabilities_v2 = STRVEC_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.nr; i++) {
  74                 const char *out;
  75                 if (skip_prefix(server_capabilities_v2.v[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.nr; i++) {
  91                 const char *out;
  92                 if (skip_prefix(server_capabilities_v2.v[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.nr; i++) {
 107                 const char *out;
 108                 if (skip_prefix(server_capabilities_v2.v[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                 strvec_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         case PACKET_READ_RESPONSE_END:
 146                 version = protocol_v0;
 147                 break;
 148         case PACKET_READ_NORMAL:
 149                 version = determine_protocol_version_client(reader->line);
 150                 break;
 151         }
 152
 153         switch (version) {
 154         case protocol_v2:
 155                 process_capabilities_v2(reader);
 156                 break;
 157         case protocol_v1:
 158                 /* Read the peeked version line */
 159                 packet_reader_read(reader);
 160                 break;
 161         case protocol_v0:
 162                 break;
 163         case protocol_unknown_version:
 164                 BUG("unknown protocol version");
 165         }
 166
 167         return version;
 168 }
 169
 170 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
 171 {
 172         char *sym, *target;
 173         struct string_list_item *item;
 174
 175         if (!len)
 176                 return; /* just "symref" */
 177         /* e.g. "symref=HEAD:refs/heads/master" */
 178         sym = xmemdupz(val, len);
 179         target = strchr(sym, ':');
 180         if (!target)
 181                 /* just "symref=something" */
 182                 goto reject;
 183         *(target++) = '\0';
 184         if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
 185             check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
 186                 /* "symref=bogus:pair */
 187                 goto reject;
 188         item = string_list_append_nodup(symref, sym);
 189         item->util = target;
 190         return;
 191 reject:
 192         free(sym);
 193         return;
 194 }
 195
 196 static void annotate_refs_with_symref_info(struct ref *ref)
 197 {
 198         struct string_list symref = STRING_LIST_INIT_DUP;
 199         int offset = 0;
 200
 201         while (1) {
 202                 int len;
 203                 const char *val;
 204
 205                 val = next_server_feature_value("symref", &len, &offset);
 206                 if (!val)
 207                         break;
 208                 parse_one_symref_info(&symref, val, len);
 209         }
 210         string_list_sort(&symref);
 211
 212         for (; ref; ref = ref->next) {
 213                 struct string_list_item *item;
 214                 item = string_list_lookup(&symref, ref->name);
 215                 if (!item)
 216                         continue;
 217                 ref->symref = xstrdup((char *)item->util);
 218         }
 219         string_list_clear(&symref, 0);
 220 }
 221
 222 static void process_capabilities(struct packet_reader *reader, int *linelen)
 223 {
 224         const char *feat_val;
 225         int feat_len;
 226         const char *line = reader->line;
 227         int nul_location = strlen(line);
 228         if (nul_location == *linelen)
 229                 return;
 230         server_capabilities_v1 = xstrdup(line + nul_location + 1);
 231         *linelen = nul_location;
 232
 233         feat_val = server_feature_value("object-format", &feat_len);
 234         if (feat_val) {
 235                 char *hash_name = xstrndup(feat_val, feat_len);
 236                 int hash_algo = hash_algo_by_name(hash_name);
 237                 if (hash_algo != GIT_HASH_UNKNOWN)
 238                         reader->hash_algo = &hash_algos[hash_algo];
 239                 free(hash_name);
 240         } else {
 241                 reader->hash_algo = &hash_algos[GIT_HASH_SHA1];
 242         }
 243 }
 244
 245 static int process_dummy_ref(const struct packet_reader *reader)
 246 {
 247         const char *line = reader->line;
 248         struct object_id oid;
 249         const char *name;
 250
 251         if (parse_oid_hex_algop(line, &oid, &name, reader->hash_algo))
 252                 return 0;
 253         if (*name != ' ')
 254                 return 0;
 255         name++;
 256
 257         return oideq(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
 258 }
 259
 260 static void check_no_capabilities(const char *line, int len)
 261 {
 262         if (strlen(line) != len)
 263                 warning(_("ignoring capabilities after first line '%s'"),
 264                         line + strlen(line));
 265 }
 266
 267 static int process_ref(const struct packet_reader *reader, int len,
 268                        struct ref ***list, unsigned int flags,
 269                        struct oid_array *extra_have)
 270 {
 271         const char *line = reader->line;
 272         struct object_id old_oid;
 273         const char *name;
 274
 275         if (parse_oid_hex_algop(line, &old_oid, &name, reader->hash_algo))
 276                 return 0;
 277         if (*name != ' ')
 278                 return 0;
 279         name++;
 280
 281         if (extra_have && !strcmp(name, ".have")) {
 282                 oid_array_append(extra_have, &old_oid);
 283         } else if (!strcmp(name, "capabilities^{}")) {
 284                 die(_("protocol error: unexpected capabilities^{}"));
 285         } else if (check_ref(name, flags)) {
 286                 struct ref *ref = alloc_ref(name);
 287                 oidcpy(&ref->old_oid, &old_oid);
 288                 **list = ref;
 289                 *list = &ref->next;
 290         }
 291         check_no_capabilities(line, len);
 292         return 1;
 293 }
 294
 295 static int process_shallow(const struct packet_reader *reader, int len,
 296                            struct oid_array *shallow_points)
 297 {
 298         const char *line = reader->line;
 299         const char *arg;
 300         struct object_id old_oid;
 301
 302         if (!skip_prefix(line, "shallow ", &arg))
 303                 return 0;
 304
 305         if (get_oid_hex_algop(arg, &old_oid, reader->hash_algo))
 306                 die(_("protocol error: expected shallow sha-1, got '%s'"), arg);
 307         if (!shallow_points)
 308                 die(_("repository on the other end cannot be shallow"));
 309         oid_array_append(shallow_points, &old_oid);
 310         check_no_capabilities(line, len);
 311         return 1;
 312 }
 313
 314 enum get_remote_heads_state {
 315         EXPECTING_FIRST_REF = 0,
 316         EXPECTING_REF,
 317         EXPECTING_SHALLOW,
 318         EXPECTING_DONE,
 319 };
 320
 321 /*
 322  * Read all the refs from the other end
 323  */
 324 struct ref **get_remote_heads(struct packet_reader *reader,
 325                               struct ref **list, unsigned int flags,
 326                               struct oid_array *extra_have,
 327                               struct oid_array *shallow_points)
 328 {
 329         struct ref **orig_list = list;
 330         int len = 0;
 331         enum get_remote_heads_state state = EXPECTING_FIRST_REF;
 332
 333         *list = NULL;
 334
 335         while (state != EXPECTING_DONE) {
 336                 switch (packet_reader_read(reader)) {
 337                 case PACKET_READ_EOF:
 338                         die_initial_contact(1);
 339                 case PACKET_READ_NORMAL:
 340                         len = reader->pktlen;
 341                         break;
 342                 case PACKET_READ_FLUSH:
 343                         state = EXPECTING_DONE;
 344                         break;
 345                 case PACKET_READ_DELIM:
 346                 case PACKET_READ_RESPONSE_END:
 347                         die(_("invalid packet"));
 348                 }
 349
 350                 switch (state) {
 351                 case EXPECTING_FIRST_REF:
 352                         process_capabilities(reader, &len);
 353                         if (process_dummy_ref(reader)) {
 354                                 state = EXPECTING_SHALLOW;
 355                                 break;
 356                         }
 357                         state = EXPECTING_REF;
 358                         /* fallthrough */
 359                 case EXPECTING_REF:
 360                         if (process_ref(reader, len, &list, flags, extra_have))
 361                                 break;
 362                         state = EXPECTING_SHALLOW;
 363                         /* fallthrough */
 364                 case EXPECTING_SHALLOW:
 365                         if (process_shallow(reader, len, shallow_points))
 366                                 break;
 367                         die(_("protocol error: unexpected '%s'"), reader->line);
 368                 case EXPECTING_DONE:
 369                         break;
 370                 }
 371         }
 372
 373         annotate_refs_with_symref_info(*orig_list);
 374
 375         return list;
 376 }
 377
 378 /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */
 379 static int process_ref_v2(struct packet_reader *reader, struct ref ***list)
 380 {
 381         int ret = 1;
 382         int i = 0;
 383         struct object_id old_oid;
 384         struct ref *ref;
 385         struct string_list line_sections = STRING_LIST_INIT_DUP;
 386         const char *end;
 387         const char *line = reader->line;
 388
 389         /*
 390          * Ref lines have a number of fields which are space deliminated.  The
 391          * first field is the OID of the ref.  The second field is the ref
 392          * name.  Subsequent fields (symref-target and peeled) are optional and
 393          * don't have a particular order.
 394          */
 395         if (string_list_split(&line_sections, line, ' ', -1) < 2) {
 396                 ret = 0;
 397                 goto out;
 398         }
 399
 400         if (parse_oid_hex_algop(line_sections.items[i++].string, &old_oid, &end, reader->hash_algo) ||
 401             *end) {
 402                 ret = 0;
 403                 goto out;
 404         }
 405
 406         ref = alloc_ref(line_sections.items[i++].string);
 407
 408         memcpy(ref->old_oid.hash, old_oid.hash, reader->hash_algo->rawsz);
 409         **list = ref;
 410         *list = &ref->next;
 411
 412         for (; i < line_sections.nr; i++) {
 413                 const char *arg = line_sections.items[i].string;
 414                 if (skip_prefix(arg, "symref-target:", &arg))
 415                         ref->symref = xstrdup(arg);
 416
 417                 if (skip_prefix(arg, "peeled:", &arg)) {
 418                         struct object_id peeled_oid;
 419                         char *peeled_name;
 420                         struct ref *peeled;
 421                         if (parse_oid_hex_algop(arg, &peeled_oid, &end,
 422                                                 reader->hash_algo) || *end) {
 423                                 ret = 0;
 424                                 goto out;
 425                         }
 426
 427                         peeled_name = xstrfmt("%s^{}", ref->name);
 428                         peeled = alloc_ref(peeled_name);
 429
 430                         memcpy(peeled->old_oid.hash, peeled_oid.hash,
 431                                reader->hash_algo->rawsz);
 432                         **list = peeled;
 433                         *list = &peeled->next;
 434
 435                         free(peeled_name);
 436                 }
 437         }
 438
 439 out:
 440         string_list_clear(&line_sections, 0);
 441         return ret;
 442 }
 443
 444 void check_stateless_delimiter(int stateless_rpc,
 445                               struct packet_reader *reader,
 446                               const char *error)
 447 {
 448         if (!stateless_rpc)
 449                 return; /* not in stateless mode, no delimiter expected */
 450         if (packet_reader_read(reader) != PACKET_READ_RESPONSE_END)
 451                 die("%s", error);
 452 }
 453
 454 struct ref **get_remote_refs(int fd_out, struct packet_reader *reader,
 455                              struct ref **list, int for_push,
 456                              struct transport_ls_refs_options *transport_options,
 457                              const struct string_list *server_options,
 458                              int stateless_rpc)
 459 {
 460         int i;
 461         const char *hash_name;
 462         struct strvec *ref_prefixes = transport_options ?
 463                 &transport_options->ref_prefixes : NULL;
 464         *list = NULL;
 465
 466         if (server_supports_v2("ls-refs", 1))
 467                 packet_write_fmt(fd_out, "command=ls-refs\n");
 468
 469         if (server_supports_v2("agent", 0))
 470                 packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized());
 471
 472         if (server_feature_v2("object-format", &hash_name)) {
 473                 int hash_algo = hash_algo_by_name(hash_name);
 474                 if (hash_algo == GIT_HASH_UNKNOWN)
 475                         die(_("unknown object format '%s' specified by server"), hash_name);
 476                 reader->hash_algo = &hash_algos[hash_algo];
 477                 packet_write_fmt(fd_out, "object-format=%s", reader->hash_algo->name);
 478         } else {
 479                 reader->hash_algo = &hash_algos[GIT_HASH_SHA1];
 480         }
 481
 482         if (server_options && server_options->nr &&
 483             server_supports_v2("server-option", 1))
 484                 for (i = 0; i < server_options->nr; i++)
 485                         packet_write_fmt(fd_out, "server-option=%s",
 486                                          server_options->items[i].string);
 487
 488         packet_delim(fd_out);
 489         /* When pushing we don't want to request the peeled tags */
 490         if (!for_push)
 491                 packet_write_fmt(fd_out, "peel\n");
 492         packet_write_fmt(fd_out, "symrefs\n");
 493         for (i = 0; ref_prefixes && i < ref_prefixes->nr; i++) {
 494                 packet_write_fmt(fd_out, "ref-prefix %s\n",
 495                                  ref_prefixes->v[i]);
 496         }
 497         packet_flush(fd_out);
 498
 499         /* Process response from server */
 500         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
 501                 if (!process_ref_v2(reader, &list))
 502                         die(_("invalid ls-refs response: %s"), reader->line);
 503         }
 504
 505         if (reader->status != PACKET_READ_FLUSH)
 506                 die(_("expected flush after ref listing"));
 507
 508         check_stateless_delimiter(stateless_rpc, reader,
 509                                   _("expected response end packet after ref listing"));
 510
 511         return list;
 512 }
 513
 514 const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp, int *offset)
 515 {
 516         int len;
 517
 518         if (!feature_list)
 519                 return NULL;
 520
 521         len = strlen(feature);
 522         if (offset)
 523                 feature_list += *offset;
 524         while (*feature_list) {
 525                 const char *found = strstr(feature_list, feature);
 526                 if (!found)
 527                         return NULL;
 528                 if (feature_list == found || isspace(found[-1])) {
 529                         const char *value = found + len;
 530                         /* feature with no value (e.g., "thin-pack") */
 531                         if (!*value || isspace(*value)) {
 532                                 if (lenp)
 533                                         *lenp = 0;
 534                                 return value;
 535                         }
 536                         /* feature with a value (e.g., "agent=git/1.2.3") */
 537                         else if (*value == '=') {
 538                                 int end;
 539
 540                                 value++;
 541                                 end = strcspn(value, " \t\n");
 542                                 if (lenp)
 543                                         *lenp = end;
 544                                 if (offset)
 545                                         *offset = value + end - feature_list;
 546                                 return value;
 547                         }
 548                         /*
 549                          * otherwise we matched a substring of another feature;
 550                          * keep looking
 551                          */
 552                 }
 553                 feature_list = found + 1;
 554         }
 555         return NULL;
 556 }
 557
 558 int server_supports_hash(const char *desired, int *feature_supported)
 559 {
 560         int offset = 0;
 561         int len;
 562         const char *hash;
 563
 564         hash = next_server_feature_value("object-format", &len, &offset);
 565         if (feature_supported)
 566                 *feature_supported = !!hash;
 567         if (!hash) {
 568                 hash = hash_algos[GIT_HASH_SHA1].name;
 569                 len = strlen(hash);
 570         }
 571         while (hash) {
 572                 if (!xstrncmpz(desired, hash, len))
 573                         return 1;
 574
 575                 hash = next_server_feature_value("object-format", &len, &offset);
 576         }
 577         return 0;
 578 }
 579
 580 int parse_feature_request(const char *feature_list, const char *feature)
 581 {
 582         return !!parse_feature_value(feature_list, feature, NULL, NULL);
 583 }
 584
 585 static const char *next_server_feature_value(const char *feature, int *len, int *offset)
 586 {
 587         return parse_feature_value(server_capabilities_v1, feature, len, offset);
 588 }
 589
 590 const char *server_feature_value(const char *feature, int *len)
 591 {
 592         return parse_feature_value(server_capabilities_v1, feature, len, NULL);
 593 }
 594
 595 int server_supports(const char *feature)
 596 {
 597         return !!server_feature_value(feature, NULL);
 598 }
 599
 600 enum protocol {
 601         PROTO_LOCAL = 1,
 602         PROTO_FILE,
 603         PROTO_SSH,
 604         PROTO_GIT
 605 };
 606
 607 int url_is_local_not_ssh(const char *url)
 608 {
 609         const char *colon = strchr(url, ':');
 610         const char *slash = strchr(url, '/');
 611         return !colon || (slash && slash < colon) ||
 612                 (has_dos_drive_prefix(url) && is_valid_path(url));
 613 }
 614
 615 static const char *prot_name(enum protocol protocol)
 616 {
 617         switch (protocol) {
 618                 case PROTO_LOCAL:
 619                 case PROTO_FILE:
 620                         return "file";
 621                 case PROTO_SSH:
 622                         return "ssh";
 623                 case PROTO_GIT:
 624                         return "git";
 625                 default:
 626                         return "unknown protocol";
 627         }
 628 }
 629
 630 static enum protocol get_protocol(const char *name)
 631 {
 632         if (!strcmp(name, "ssh"))
 633                 return PROTO_SSH;
 634         if (!strcmp(name, "git"))
 635                 return PROTO_GIT;
 636         if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
 637                 return PROTO_SSH;
 638         if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
 639                 return PROTO_SSH;
 640         if (!strcmp(name, "file"))
 641                 return PROTO_FILE;
 642         die(_("protocol '%s' is not supported"), name);
 643 }
 644
 645 static char *host_end(char **hoststart, int removebrackets)
 646 {
 647         char *host = *hoststart;
 648         char *end;
 649         char *start = strstr(host, "@[");
 650         if (start)
 651                 start++; /* Jump over '@' */
 652         else
 653                 start = host;
 654         if (start[0] == '[') {
 655                 end = strchr(start + 1, ']');
 656                 if (end) {
 657                         if (removebrackets) {
 658                                 *end = 0;
 659                                 memmove(start, start + 1, end - start);
 660                                 end++;
 661                         }
 662                 } else
 663                         end = host;
 664         } else
 665                 end = host;
 666         return end;
 667 }
 668
 669 #define STR_(s) # s
 670 #define STR(s)  STR_(s)
 671
 672 static void get_host_and_port(char **host, const char **port)
 673 {
 674         char *colon, *end;
 675         end = host_end(host, 1);
 676         colon = strchr(end, ':');
 677         if (colon) {
 678                 long portnr = strtol(colon + 1, &end, 10);
 679                 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
 680                         *colon = 0;
 681                         *port = colon + 1;
 682                 } else if (!colon[1]) {
 683                         *colon = 0;
 684                 }
 685         }
 686 }
 687
 688 static void enable_keepalive(int sockfd)
 689 {
 690         int ka = 1;
 691
 692         if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
 693                 error_errno(_("unable to set SO_KEEPALIVE on socket"));
 694 }
 695
 696 #ifndef NO_IPV6
 697
 698 static const char *ai_name(const struct addrinfo *ai)
 699 {
 700         static char addr[NI_MAXHOST];
 701         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 702                         NI_NUMERICHOST) != 0)
 703                 xsnprintf(addr, sizeof(addr), "(unknown)");
 704
 705         return addr;
 706 }
 707
 708 /*
 709  * Returns a connected socket() fd, or else die()s.
 710  */
 711 static int git_tcp_connect_sock(char *host, int flags)
 712 {
 713         struct strbuf error_message = STRBUF_INIT;
 714         int sockfd = -1;
 715         const char *port = STR(DEFAULT_GIT_PORT);
 716         struct addrinfo hints, *ai0, *ai;
 717         int gai;
 718         int cnt = 0;
 719
 720         get_host_and_port(&host, &port);
 721         if (!*port)
 722                 port = "<none>";
 723
 724         memset(&hints, 0, sizeof(hints));
 725         if (flags & CONNECT_IPV4)
 726                 hints.ai_family = AF_INET;
 727         else if (flags & CONNECT_IPV6)
 728                 hints.ai_family = AF_INET6;
 729         hints.ai_socktype = SOCK_STREAM;
 730         hints.ai_protocol = IPPROTO_TCP;
 731
 732         if (flags & CONNECT_VERBOSE)
 733                 fprintf(stderr, _("Looking up %s ... "), host);
 734
 735         gai = getaddrinfo(host, port, &hints, &ai);
 736         if (gai)
 737                 die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai));
 738
 739         if (flags & CONNECT_VERBOSE)
 740                 /* TRANSLATORS: this is the end of "Looking up %s ... " */
 741                 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
 742
 743         for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 744                 sockfd = socket(ai->ai_family,
 745                                 ai->ai_socktype, ai->ai_protocol);
 746                 if ((sockfd < 0) ||
 747                     (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 748                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 749                                     host, cnt, ai_name(ai), strerror(errno));
 750                         if (0 <= sockfd)
 751                                 close(sockfd);
 752                         sockfd = -1;
 753                         continue;
 754                 }
 755                 if (flags & CONNECT_VERBOSE)
 756                         fprintf(stderr, "%s ", ai_name(ai));
 757                 break;
 758         }
 759
 760         freeaddrinfo(ai0);
 761
 762         if (sockfd < 0)
 763                 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
 764
 765         enable_keepalive(sockfd);
 766
 767         if (flags & CONNECT_VERBOSE)
 768                 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
 769                 fprintf_ln(stderr, _("done."));
 770
 771         strbuf_release(&error_message);
 772
 773         return sockfd;
 774 }
 775
 776 #else /* NO_IPV6 */
 777
 778 /*
 779  * Returns a connected socket() fd, or else die()s.
 780  */
 781 static int git_tcp_connect_sock(char *host, int flags)
 782 {
 783         struct strbuf error_message = STRBUF_INIT;
 784         int sockfd = -1;
 785         const char *port = STR(DEFAULT_GIT_PORT);
 786         char *ep;
 787         struct hostent *he;
 788         struct sockaddr_in sa;
 789         char **ap;
 790         unsigned int nport;
 791         int cnt;
 792
 793         get_host_and_port(&host, &port);
 794
 795         if (flags & CONNECT_VERBOSE)
 796                 fprintf(stderr, _("Looking up %s ... "), host);
 797
 798         he = gethostbyname(host);
 799         if (!he)
 800                 die(_("unable to look up %s (%s)"), host, hstrerror(h_errno));
 801         nport = strtoul(port, &ep, 10);
 802         if ( ep == port || *ep ) {
 803                 /* Not numeric */
 804                 struct servent *se = getservbyname(port,"tcp");
 805                 if ( !se )
 806                         die(_("unknown port %s"), port);
 807                 nport = se->s_port;
 808         }
 809
 810         if (flags & CONNECT_VERBOSE)
 811                 /* TRANSLATORS: this is the end of "Looking up %s ... " */
 812                 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
 813
 814         for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 815                 memset(&sa, 0, sizeof sa);
 816                 sa.sin_family = he->h_addrtype;
 817                 sa.sin_port = htons(nport);
 818                 memcpy(&sa.sin_addr, *ap, he->h_length);
 819
 820                 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 821                 if ((sockfd < 0) ||
 822                     connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 823                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 824                                 host,
 825                                 cnt,
 826                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 827                                 strerror(errno));
 828                         if (0 <= sockfd)
 829                                 close(sockfd);
 830                         sockfd = -1;
 831                         continue;
 832                 }
 833                 if (flags & CONNECT_VERBOSE)
 834                         fprintf(stderr, "%s ",
 835                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 836                 break;
 837         }
 838
 839         if (sockfd < 0)
 840                 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
 841
 842         enable_keepalive(sockfd);
 843
 844         if (flags & CONNECT_VERBOSE)
 845                 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
 846                 fprintf_ln(stderr, _("done."));
 847
 848         return sockfd;
 849 }
 850
 851 #endif /* NO_IPV6 */
 852
 853
 854 /*
 855  * Dummy child_process returned by git_connect() if the transport protocol
 856  * does not need fork(2).
 857  */
 858 static struct child_process no_fork = CHILD_PROCESS_INIT;
 859
 860 int git_connection_is_socket(struct child_process *conn)
 861 {
 862         return conn == &no_fork;
 863 }
 864
 865 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
 866 {
 867         int sockfd = git_tcp_connect_sock(host, flags);
 868
 869         fd[0] = sockfd;
 870         fd[1] = dup(sockfd);
 871
 872         return &no_fork;
 873 }
 874
 875
 876 static char *git_proxy_command;
 877
 878 static int git_proxy_command_options(const char *var, const char *value,
 879                 void *cb)
 880 {
 881         if (!strcmp(var, "core.gitproxy")) {
 882                 const char *for_pos;
 883                 int matchlen = -1;
 884                 int hostlen;
 885                 const char *rhost_name = cb;
 886                 int rhost_len = strlen(rhost_name);
 887
 888                 if (git_proxy_command)
 889                         return 0;
 890                 if (!value)
 891                         return config_error_nonbool(var);
 892                 /* [core]
 893                  * ;# matches www.kernel.org as well
 894                  * gitproxy = netcatter-1 for kernel.org
 895                  * gitproxy = netcatter-2 for sample.xz
 896                  * gitproxy = netcatter-default
 897                  */
 898                 for_pos = strstr(value, " for ");
 899                 if (!for_pos)
 900                         /* matches everybody */
 901                         matchlen = strlen(value);
 902                 else {
 903                         hostlen = strlen(for_pos + 5);
 904                         if (rhost_len < hostlen)
 905                                 matchlen = -1;
 906                         else if (!strncmp(for_pos + 5,
 907                                           rhost_name + rhost_len - hostlen,
 908                                           hostlen) &&
 909                                  ((rhost_len == hostlen) ||
 910                                   rhost_name[rhost_len - hostlen -1] == '.'))
 911                                 matchlen = for_pos - value;
 912                         else
 913                                 matchlen = -1;
 914                 }
 915                 if (0 <= matchlen) {
 916                         /* core.gitproxy = none for kernel.org */
 917                         if (matchlen == 4 &&
 918                             !memcmp(value, "none", 4))
 919                                 matchlen = 0;
 920                         git_proxy_command = xmemdupz(value, matchlen);
 921                 }
 922                 return 0;
 923         }
 924
 925         return git_default_config(var, value, cb);
 926 }
 927
 928 static int git_use_proxy(const char *host)
 929 {
 930         git_proxy_command = getenv("GIT_PROXY_COMMAND");
 931         git_config(git_proxy_command_options, (void*)host);
 932         return (git_proxy_command && *git_proxy_command);
 933 }
 934
 935 static struct child_process *git_proxy_connect(int fd[2], char *host)
 936 {
 937         const char *port = STR(DEFAULT_GIT_PORT);
 938         struct child_process *proxy;
 939
 940         get_host_and_port(&host, &port);
 941
 942         if (looks_like_command_line_option(host))
 943                 die(_("strange hostname '%s' blocked"), host);
 944         if (looks_like_command_line_option(port))
 945                 die(_("strange port '%s' blocked"), port);
 946
 947         proxy = xmalloc(sizeof(*proxy));
 948         child_process_init(proxy);
 949         strvec_push(&proxy->args, git_proxy_command);
 950         strvec_push(&proxy->args, host);
 951         strvec_push(&proxy->args, port);
 952         proxy->in = -1;
 953         proxy->out = -1;
 954         if (start_command(proxy))
 955                 die(_("cannot start proxy %s"), git_proxy_command);
 956         fd[0] = proxy->out; /* read from proxy stdout */
 957         fd[1] = proxy->in;  /* write to proxy stdin */
 958         return proxy;
 959 }
 960
 961 static char *get_port(char *host)
 962 {
 963         char *end;
 964         char *p = strchr(host, ':');
 965
 966         if (p) {
 967                 long port = strtol(p + 1, &end, 10);
 968                 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 969                         *p = '\0';
 970                         return p+1;
 971                 }
 972         }
 973
 974         return NULL;
 975 }
 976
 977 /*
 978  * Extract protocol and relevant parts from the specified connection URL.
 979  * The caller must free() the returned strings.
 980  */
 981 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
 982                                        char **ret_path)
 983 {
 984         char *url;
 985         char *host, *path;
 986         char *end;
 987         int separator = '/';
 988         enum protocol protocol = PROTO_LOCAL;
 989
 990         if (is_url(url_orig))
 991                 url = url_decode(url_orig);
 992         else
 993                 url = xstrdup(url_orig);
 994
 995         host = strstr(url, "://");
 996         if (host) {
 997                 *host = '\0';
 998                 protocol = get_protocol(url);
 999                 host += 3;
1000         } else {
1001                 host = url;
1002                 if (!url_is_local_not_ssh(url)) {
1003                         protocol = PROTO_SSH;
1004                         separator = ':';
1005                 }
1006         }
1007
1008         /*
1009          * Don't do destructive transforms as protocol code does
1010          * '[]' unwrapping in get_host_and_port()
1011          */
1012         end = host_end(&host, 0);
1013
1014         if (protocol == PROTO_LOCAL)
1015                 path = end;
1016         else if (protocol == PROTO_FILE && *host != '/' &&
1017                  !has_dos_drive_prefix(host) &&
1018                  offset_1st_component(host - 2) > 1)
1019                 path = host - 2; /* include the leading "//" */
1020         else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
1021                 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
1022         else
1023                 path = strchr(end, separator);
1024
1025         if (!path || !*path)
1026                 die(_("no path specified; see 'git help pull' for valid url syntax"));
1027
1028         /*
1029          * null-terminate hostname and point path to ~ for URL's like this:
1030          *    ssh://host.xz/~user/repo
1031          */
1032
1033         end = path; /* Need to \0 terminate host here */
1034         if (separator == ':')
1035                 path++; /* path starts after ':' */
1036         if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
1037                 if (path[1] == '~')
1038                         path++;
1039         }
1040
1041         path = xstrdup(path);
1042         *end = '\0';
1043
1044         *ret_host = xstrdup(host);
1045         *ret_path = path;
1046         free(url);
1047         return protocol;
1048 }
1049
1050 static const char *get_ssh_command(void)
1051 {
1052         const char *ssh;
1053
1054         if ((ssh = getenv("GIT_SSH_COMMAND")))
1055                 return ssh;
1056
1057         if (!git_config_get_string_tmp("core.sshcommand", &ssh))
1058                 return ssh;
1059
1060         return NULL;
1061 }
1062
1063 enum ssh_variant {
1064         VARIANT_AUTO,
1065         VARIANT_SIMPLE,
1066         VARIANT_SSH,
1067         VARIANT_PLINK,
1068         VARIANT_PUTTY,
1069         VARIANT_TORTOISEPLINK,
1070 };
1071
1072 static void override_ssh_variant(enum ssh_variant *ssh_variant)
1073 {
1074         const char *variant = getenv("GIT_SSH_VARIANT");
1075
1076         if (!variant && git_config_get_string_tmp("ssh.variant", &variant))
1077                 return;
1078
1079         if (!strcmp(variant, "auto"))
1080                 *ssh_variant = VARIANT_AUTO;
1081         else if (!strcmp(variant, "plink"))
1082                 *ssh_variant = VARIANT_PLINK;
1083         else if (!strcmp(variant, "putty"))
1084                 *ssh_variant = VARIANT_PUTTY;
1085         else if (!strcmp(variant, "tortoiseplink"))
1086                 *ssh_variant = VARIANT_TORTOISEPLINK;
1087         else if (!strcmp(variant, "simple"))
1088                 *ssh_variant = VARIANT_SIMPLE;
1089         else
1090                 *ssh_variant = VARIANT_SSH;
1091 }
1092
1093 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
1094                                               int is_cmdline)
1095 {
1096         enum ssh_variant ssh_variant = VARIANT_AUTO;
1097         const char *variant;
1098         char *p = NULL;
1099
1100         override_ssh_variant(&ssh_variant);
1101
1102         if (ssh_variant != VARIANT_AUTO)
1103                 return ssh_variant;
1104
1105         if (!is_cmdline) {
1106                 p = xstrdup(ssh_command);
1107                 variant = basename(p);
1108         } else {
1109                 const char **ssh_argv;
1110
1111                 p = xstrdup(ssh_command);
1112                 if (split_cmdline(p, &ssh_argv) > 0) {
1113                         variant = basename((char *)ssh_argv[0]);
1114                         /*
1115                          * At this point, variant points into the buffer
1116                          * referenced by p, hence we do not need ssh_argv
1117                          * any longer.
1118                          */
1119                         free(ssh_argv);
1120                 } else {
1121                         free(p);
1122                         return ssh_variant;
1123                 }
1124         }
1125
1126         if (!strcasecmp(variant, "ssh") ||
1127             !strcasecmp(variant, "ssh.exe"))
1128                 ssh_variant = VARIANT_SSH;
1129         else if (!strcasecmp(variant, "plink") ||
1130                  !strcasecmp(variant, "plink.exe"))
1131                 ssh_variant = VARIANT_PLINK;
1132         else if (!strcasecmp(variant, "tortoiseplink") ||
1133                  !strcasecmp(variant, "tortoiseplink.exe"))
1134                 ssh_variant = VARIANT_TORTOISEPLINK;
1135
1136         free(p);
1137         return ssh_variant;
1138 }
1139
1140 /*
1141  * Open a connection using Git's native protocol.
1142  *
1143  * The caller is responsible for freeing hostandport, but this function may
1144  * modify it (for example, to truncate it to remove the port part).
1145  */
1146 static struct child_process *git_connect_git(int fd[2], char *hostandport,
1147                                              const char *path, const char *prog,
1148                                              enum protocol_version version,
1149                                              int flags)
1150 {
1151         struct child_process *conn;
1152         struct strbuf request = STRBUF_INIT;
1153         /*
1154          * Set up virtual host information based on where we will
1155          * connect, unless the user has overridden us in
1156          * the environment.
1157          */
1158         char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
1159         if (target_host)
1160                 target_host = xstrdup(target_host);
1161         else
1162                 target_host = xstrdup(hostandport);
1163
1164         transport_check_allowed("git");
1165
1166         /*
1167          * These underlying connection commands die() if they
1168          * cannot connect.
1169          */
1170         if (git_use_proxy(hostandport))
1171                 conn = git_proxy_connect(fd, hostandport);
1172         else
1173                 conn = git_tcp_connect(fd, hostandport, flags);
1174         /*
1175          * Separate original protocol components prog and path
1176          * from extended host header with a NUL byte.
1177          *
1178          * Note: Do not add any other headers here!  Doing so
1179          * will cause older git-daemon servers to crash.
1180          */
1181         strbuf_addf(&request,
1182                     "%s %s%chost=%s%c",
1183                     prog, path, 0,
1184                     target_host, 0);
1185
1186         /* If using a new version put that stuff here after a second null byte */
1187         if (version > 0) {
1188                 strbuf_addch(&request, '\0');
1189                 strbuf_addf(&request, "version=%d%c",
1190                             version, '\0');
1191         }
1192
1193         packet_write(fd[1], request.buf, request.len);
1194
1195         free(target_host);
1196         strbuf_release(&request);
1197         return conn;
1198 }
1199
1200 /*
1201  * Append the appropriate environment variables to `env` and options to
1202  * `args` for running ssh in Git's SSH-tunneled transport.
1203  */
1204 static void push_ssh_options(struct strvec *args, struct strvec *env,
1205                              enum ssh_variant variant, const char *port,
1206                              enum protocol_version version, int flags)
1207 {
1208         if (variant == VARIANT_SSH &&
1209             version > 0) {
1210                 strvec_push(args, "-o");
1211                 strvec_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
1212                 strvec_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1213                              version);
1214         }
1215
1216         if (flags & CONNECT_IPV4) {
1217                 switch (variant) {
1218                 case VARIANT_AUTO:
1219                         BUG("VARIANT_AUTO passed to push_ssh_options");
1220                 case VARIANT_SIMPLE:
1221                         die(_("ssh variant 'simple' does not support -4"));
1222                 case VARIANT_SSH:
1223                 case VARIANT_PLINK:
1224                 case VARIANT_PUTTY:
1225                 case VARIANT_TORTOISEPLINK:
1226                         strvec_push(args, "-4");
1227                 }
1228         } else if (flags & CONNECT_IPV6) {
1229                 switch (variant) {
1230                 case VARIANT_AUTO:
1231                         BUG("VARIANT_AUTO passed to push_ssh_options");
1232                 case VARIANT_SIMPLE:
1233                         die(_("ssh variant 'simple' does not support -6"));
1234                 case VARIANT_SSH:
1235                 case VARIANT_PLINK:
1236                 case VARIANT_PUTTY:
1237                 case VARIANT_TORTOISEPLINK:
1238                         strvec_push(args, "-6");
1239                 }
1240         }
1241
1242         if (variant == VARIANT_TORTOISEPLINK)
1243                 strvec_push(args, "-batch");
1244
1245         if (port) {
1246                 switch (variant) {
1247                 case VARIANT_AUTO:
1248                         BUG("VARIANT_AUTO passed to push_ssh_options");
1249                 case VARIANT_SIMPLE:
1250                         die(_("ssh variant 'simple' does not support setting port"));
1251                 case VARIANT_SSH:
1252                         strvec_push(args, "-p");
1253                         break;
1254                 case VARIANT_PLINK:
1255                 case VARIANT_PUTTY:
1256                 case VARIANT_TORTOISEPLINK:
1257                         strvec_push(args, "-P");
1258                 }
1259
1260                 strvec_push(args, port);
1261         }
1262 }
1263
1264 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
1265 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
1266                           const char *port, enum protocol_version version,
1267                           int flags)
1268 {
1269         const char *ssh;
1270         enum ssh_variant variant;
1271
1272         if (looks_like_command_line_option(ssh_host))
1273                 die(_("strange hostname '%s' blocked"), ssh_host);
1274
1275         ssh = get_ssh_command();
1276         if (ssh) {
1277                 variant = determine_ssh_variant(ssh, 1);
1278         } else {
1279                 /*
1280                  * GIT_SSH is the no-shell version of
1281                  * GIT_SSH_COMMAND (and must remain so for
1282                  * historical compatibility).
1283                  */
1284                 conn->use_shell = 0;
1285
1286                 ssh = getenv("GIT_SSH");
1287                 if (!ssh)
1288                         ssh = "ssh";
1289                 variant = determine_ssh_variant(ssh, 0);
1290         }
1291
1292         if (variant == VARIANT_AUTO) {
1293                 struct child_process detect = CHILD_PROCESS_INIT;
1294
1295                 detect.use_shell = conn->use_shell;
1296                 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1297
1298                 strvec_push(&detect.args, ssh);
1299                 strvec_push(&detect.args, "-G");
1300                 push_ssh_options(&detect.args, &detect.env_array,
1301                                  VARIANT_SSH, port, version, flags);
1302                 strvec_push(&detect.args, ssh_host);
1303
1304                 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1305         }
1306
1307         strvec_push(&conn->args, ssh);
1308         push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
1309         strvec_push(&conn->args, ssh_host);
1310 }
1311
1312 /*
1313  * This returns the dummy child_process `no_fork` if the transport protocol
1314  * does not need fork(2), or a struct child_process object if it does.  Once
1315  * done, finish the connection with finish_connect() with the value returned
1316  * from this function (it is safe to call finish_connect() with NULL to
1317  * support the former case).
1318  *
1319  * If it returns, the connect is successful; it just dies on errors (this
1320  * will hopefully be changed in a libification effort, to return NULL when
1321  * the connection failed).
1322  */
1323 struct child_process *git_connect(int fd[2], const char *url,
1324                                   const char *prog, int flags)
1325 {
1326         char *hostandport, *path;
1327         struct child_process *conn;
1328         enum protocol protocol;
1329         enum protocol_version version = get_protocol_version_config();
1330
1331         /*
1332          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
1333          * to perform a push, then fallback to v0 since the client doesn't know
1334          * how to push yet using v2.
1335          */
1336         if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
1337                 version = protocol_v0;
1338
1339         /* Without this we cannot rely on waitpid() to tell
1340          * what happened to our children.
1341          */
1342         signal(SIGCHLD, SIG_DFL);
1343
1344         protocol = parse_connect_url(url, &hostandport, &path);
1345         if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1346                 printf("Diag: url=%s\n", url ? url : "NULL");
1347                 printf("Diag: protocol=%s\n", prot_name(protocol));
1348                 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1349                 printf("Diag: path=%s\n", path ? path : "NULL");
1350                 conn = NULL;
1351         } else if (protocol == PROTO_GIT) {
1352                 conn = git_connect_git(fd, hostandport, path, prog, version, flags);
1353                 conn->trace2_child_class = "transport/git";
1354         } else {
1355                 struct strbuf cmd = STRBUF_INIT;
1356                 const char *const *var;
1357
1358                 conn = xmalloc(sizeof(*conn));
1359                 child_process_init(conn);
1360
1361                 if (looks_like_command_line_option(path))
1362                         die(_("strange pathname '%s' blocked"), path);
1363
1364                 strbuf_addstr(&cmd, prog);
1365                 strbuf_addch(&cmd, ' ');
1366                 sq_quote_buf(&cmd, path);
1367
1368                 /* remove repo-local variables from the environment */
1369                 for (var = local_repo_env; *var; var++)
1370                         strvec_push(&conn->env_array, *var);
1371
1372                 conn->use_shell = 1;
1373                 conn->in = conn->out = -1;
1374                 if (protocol == PROTO_SSH) {
1375                         char *ssh_host = hostandport;
1376                         const char *port = NULL;
1377                         transport_check_allowed("ssh");
1378                         get_host_and_port(&ssh_host, &port);
1379
1380                         if (!port)
1381                                 port = get_port(ssh_host);
1382
1383                         if (flags & CONNECT_DIAG_URL) {
1384                                 printf("Diag: url=%s\n", url ? url : "NULL");
1385                                 printf("Diag: protocol=%s\n", prot_name(protocol));
1386                                 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1387                                 printf("Diag: port=%s\n", port ? port : "NONE");
1388                                 printf("Diag: path=%s\n", path ? path : "NULL");
1389
1390                                 free(hostandport);
1391                                 free(path);
1392                                 free(conn);
1393                                 strbuf_release(&cmd);
1394                                 return NULL;
1395                         }
1396                         conn->trace2_child_class = "transport/ssh";
1397                         fill_ssh_args(conn, ssh_host, port, version, flags);
1398                 } else {
1399                         transport_check_allowed("file");
1400                         conn->trace2_child_class = "transport/file";
1401                         if (version > 0) {
1402                                 strvec_pushf(&conn->env_array,
1403                                              GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1404                                              version);
1405                         }
1406                 }
1407                 strvec_push(&conn->args, cmd.buf);
1408
1409                 if (start_command(conn))
1410                         die(_("unable to fork"));
1411
1412                 fd[0] = conn->out; /* read from child's stdout */
1413                 fd[1] = conn->in;  /* write to child's stdin */
1414                 strbuf_release(&cmd);
1415         }
1416         free(hostandport);
1417         free(path);
1418         return conn;
1419 }
1420
1421 int finish_connect(struct child_process *conn)
1422 {
1423         int code;
1424         if (!conn || git_connection_is_socket(conn))
1425                 return 0;
1426
1427         code = finish_command(conn);
1428         free(conn);
1429         return code;
1430 }