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 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         } else {
 464                 reader->hash_algo = &hash_algos[GIT_HASH_SHA1];
 465         }
 466
 467         if (server_options && server_options->nr &&
 468             server_supports_v2("server-option", 1))
 469                 for (i = 0; i < server_options->nr; i++)
 470                         packet_write_fmt(fd_out, "server-option=%s",
 471                                          server_options->items[i].string);
 472
 473         packet_delim(fd_out);
 474         /* When pushing we don't want to request the peeled tags */
 475         if (!for_push)
 476                 packet_write_fmt(fd_out, "peel\n");
 477         packet_write_fmt(fd_out, "symrefs\n");
 478         for (i = 0; ref_prefixes && i < ref_prefixes->argc; i++) {
 479                 packet_write_fmt(fd_out, "ref-prefix %s\n",
 480                                  ref_prefixes->argv[i]);
 481         }
 482         packet_flush(fd_out);
 483
 484         /* Process response from server */
 485         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
 486                 if (!process_ref_v2(reader, &list))
 487                         die(_("invalid ls-refs response: %s"), reader->line);
 488         }
 489
 490         if (reader->status != PACKET_READ_FLUSH)
 491                 die(_("expected flush after ref listing"));
 492
 493         return list;
 494 }
 495
 496 const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp, int *offset)
 497 {
 498         int len;
 499
 500         if (!feature_list)
 501                 return NULL;
 502
 503         len = strlen(feature);
 504         if (offset)
 505                 feature_list += *offset;
 506         while (*feature_list) {
 507                 const char *found = strstr(feature_list, feature);
 508                 if (!found)
 509                         return NULL;
 510                 if (feature_list == found || isspace(found[-1])) {
 511                         const char *value = found + len;
 512                         /* feature with no value (e.g., "thin-pack") */
 513                         if (!*value || isspace(*value)) {
 514                                 if (lenp)
 515                                         *lenp = 0;
 516                                 return value;
 517                         }
 518                         /* feature with a value (e.g., "agent=git/1.2.3") */
 519                         else if (*value == '=') {
 520                                 int end;
 521
 522                                 value++;
 523                                 end = strcspn(value, " \t\n");
 524                                 if (lenp)
 525                                         *lenp = end;
 526                                 if (offset)
 527                                         *offset = value + end - feature_list;
 528                                 return value;
 529                         }
 530                         /*
 531                          * otherwise we matched a substring of another feature;
 532                          * keep looking
 533                          */
 534                 }
 535                 feature_list = found + 1;
 536         }
 537         return NULL;
 538 }
 539
 540 int server_supports_hash(const char *desired, int *feature_supported)
 541 {
 542         int offset = 0;
 543         int len;
 544         const char *hash;
 545
 546         hash = next_server_feature_value("object-format", &len, &offset);
 547         if (feature_supported)
 548                 *feature_supported = !!hash;
 549         if (!hash) {
 550                 hash = hash_algos[GIT_HASH_SHA1].name;
 551                 len = strlen(hash);
 552         }
 553         while (hash) {
 554                 if (!xstrncmpz(desired, hash, len))
 555                         return 1;
 556
 557                 hash = next_server_feature_value("object-format", &len, &offset);
 558         }
 559         return 0;
 560 }
 561
 562 int parse_feature_request(const char *feature_list, const char *feature)
 563 {
 564         return !!parse_feature_value(feature_list, feature, NULL, NULL);
 565 }
 566
 567 static const char *next_server_feature_value(const char *feature, int *len, int *offset)
 568 {
 569         return parse_feature_value(server_capabilities_v1, feature, len, offset);
 570 }
 571
 572 const char *server_feature_value(const char *feature, int *len)
 573 {
 574         return parse_feature_value(server_capabilities_v1, feature, len, NULL);
 575 }
 576
 577 int server_supports(const char *feature)
 578 {
 579         return !!server_feature_value(feature, NULL);
 580 }
 581
 582 enum protocol {
 583         PROTO_LOCAL = 1,
 584         PROTO_FILE,
 585         PROTO_SSH,
 586         PROTO_GIT
 587 };
 588
 589 int url_is_local_not_ssh(const char *url)
 590 {
 591         const char *colon = strchr(url, ':');
 592         const char *slash = strchr(url, '/');
 593         return !colon || (slash && slash < colon) ||
 594                 (has_dos_drive_prefix(url) && is_valid_path(url));
 595 }
 596
 597 static const char *prot_name(enum protocol protocol)
 598 {
 599         switch (protocol) {
 600                 case PROTO_LOCAL:
 601                 case PROTO_FILE:
 602                         return "file";
 603                 case PROTO_SSH:
 604                         return "ssh";
 605                 case PROTO_GIT:
 606                         return "git";
 607                 default:
 608                         return "unknown protocol";
 609         }
 610 }
 611
 612 static enum protocol get_protocol(const char *name)
 613 {
 614         if (!strcmp(name, "ssh"))
 615                 return PROTO_SSH;
 616         if (!strcmp(name, "git"))
 617                 return PROTO_GIT;
 618         if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
 619                 return PROTO_SSH;
 620         if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
 621                 return PROTO_SSH;
 622         if (!strcmp(name, "file"))
 623                 return PROTO_FILE;
 624         die(_("protocol '%s' is not supported"), name);
 625 }
 626
 627 static char *host_end(char **hoststart, int removebrackets)
 628 {
 629         char *host = *hoststart;
 630         char *end;
 631         char *start = strstr(host, "@[");
 632         if (start)
 633                 start++; /* Jump over '@' */
 634         else
 635                 start = host;
 636         if (start[0] == '[') {
 637                 end = strchr(start + 1, ']');
 638                 if (end) {
 639                         if (removebrackets) {
 640                                 *end = 0;
 641                                 memmove(start, start + 1, end - start);
 642                                 end++;
 643                         }
 644                 } else
 645                         end = host;
 646         } else
 647                 end = host;
 648         return end;
 649 }
 650
 651 #define STR_(s) # s
 652 #define STR(s)  STR_(s)
 653
 654 static void get_host_and_port(char **host, const char **port)
 655 {
 656         char *colon, *end;
 657         end = host_end(host, 1);
 658         colon = strchr(end, ':');
 659         if (colon) {
 660                 long portnr = strtol(colon + 1, &end, 10);
 661                 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
 662                         *colon = 0;
 663                         *port = colon + 1;
 664                 } else if (!colon[1]) {
 665                         *colon = 0;
 666                 }
 667         }
 668 }
 669
 670 static void enable_keepalive(int sockfd)
 671 {
 672         int ka = 1;
 673
 674         if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
 675                 error_errno(_("unable to set SO_KEEPALIVE on socket"));
 676 }
 677
 678 #ifndef NO_IPV6
 679
 680 static const char *ai_name(const struct addrinfo *ai)
 681 {
 682         static char addr[NI_MAXHOST];
 683         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 684                         NI_NUMERICHOST) != 0)
 685                 xsnprintf(addr, sizeof(addr), "(unknown)");
 686
 687         return addr;
 688 }
 689
 690 /*
 691  * Returns a connected socket() fd, or else die()s.
 692  */
 693 static int git_tcp_connect_sock(char *host, int flags)
 694 {
 695         struct strbuf error_message = STRBUF_INIT;
 696         int sockfd = -1;
 697         const char *port = STR(DEFAULT_GIT_PORT);
 698         struct addrinfo hints, *ai0, *ai;
 699         int gai;
 700         int cnt = 0;
 701
 702         get_host_and_port(&host, &port);
 703         if (!*port)
 704                 port = "<none>";
 705
 706         memset(&hints, 0, sizeof(hints));
 707         if (flags & CONNECT_IPV4)
 708                 hints.ai_family = AF_INET;
 709         else if (flags & CONNECT_IPV6)
 710                 hints.ai_family = AF_INET6;
 711         hints.ai_socktype = SOCK_STREAM;
 712         hints.ai_protocol = IPPROTO_TCP;
 713
 714         if (flags & CONNECT_VERBOSE)
 715                 fprintf(stderr, _("Looking up %s ... "), host);
 716
 717         gai = getaddrinfo(host, port, &hints, &ai);
 718         if (gai)
 719                 die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai));
 720
 721         if (flags & CONNECT_VERBOSE)
 722                 /* TRANSLATORS: this is the end of "Looking up %s ... " */
 723                 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
 724
 725         for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 726                 sockfd = socket(ai->ai_family,
 727                                 ai->ai_socktype, ai->ai_protocol);
 728                 if ((sockfd < 0) ||
 729                     (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 730                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 731                                     host, cnt, ai_name(ai), strerror(errno));
 732                         if (0 <= sockfd)
 733                                 close(sockfd);
 734                         sockfd = -1;
 735                         continue;
 736                 }
 737                 if (flags & CONNECT_VERBOSE)
 738                         fprintf(stderr, "%s ", ai_name(ai));
 739                 break;
 740         }
 741
 742         freeaddrinfo(ai0);
 743
 744         if (sockfd < 0)
 745                 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
 746
 747         enable_keepalive(sockfd);
 748
 749         if (flags & CONNECT_VERBOSE)
 750                 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
 751                 fprintf_ln(stderr, _("done."));
 752
 753         strbuf_release(&error_message);
 754
 755         return sockfd;
 756 }
 757
 758 #else /* NO_IPV6 */
 759
 760 /*
 761  * Returns a connected socket() fd, or else die()s.
 762  */
 763 static int git_tcp_connect_sock(char *host, int flags)
 764 {
 765         struct strbuf error_message = STRBUF_INIT;
 766         int sockfd = -1;
 767         const char *port = STR(DEFAULT_GIT_PORT);
 768         char *ep;
 769         struct hostent *he;
 770         struct sockaddr_in sa;
 771         char **ap;
 772         unsigned int nport;
 773         int cnt;
 774
 775         get_host_and_port(&host, &port);
 776
 777         if (flags & CONNECT_VERBOSE)
 778                 fprintf(stderr, _("Looking up %s ... "), host);
 779
 780         he = gethostbyname(host);
 781         if (!he)
 782                 die(_("unable to look up %s (%s)"), host, hstrerror(h_errno));
 783         nport = strtoul(port, &ep, 10);
 784         if ( ep == port || *ep ) {
 785                 /* Not numeric */
 786                 struct servent *se = getservbyname(port,"tcp");
 787                 if ( !se )
 788                         die(_("unknown port %s"), port);
 789                 nport = se->s_port;
 790         }
 791
 792         if (flags & CONNECT_VERBOSE)
 793                 /* TRANSLATORS: this is the end of "Looking up %s ... " */
 794                 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
 795
 796         for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 797                 memset(&sa, 0, sizeof sa);
 798                 sa.sin_family = he->h_addrtype;
 799                 sa.sin_port = htons(nport);
 800                 memcpy(&sa.sin_addr, *ap, he->h_length);
 801
 802                 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 803                 if ((sockfd < 0) ||
 804                     connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 805                         strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 806                                 host,
 807                                 cnt,
 808                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 809                                 strerror(errno));
 810                         if (0 <= sockfd)
 811                                 close(sockfd);
 812                         sockfd = -1;
 813                         continue;
 814                 }
 815                 if (flags & CONNECT_VERBOSE)
 816                         fprintf(stderr, "%s ",
 817                                 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 818                 break;
 819         }
 820
 821         if (sockfd < 0)
 822                 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
 823
 824         enable_keepalive(sockfd);
 825
 826         if (flags & CONNECT_VERBOSE)
 827                 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
 828                 fprintf_ln(stderr, _("done."));
 829
 830         return sockfd;
 831 }
 832
 833 #endif /* NO_IPV6 */
 834
 835
 836 /*
 837  * Dummy child_process returned by git_connect() if the transport protocol
 838  * does not need fork(2).
 839  */
 840 static struct child_process no_fork = CHILD_PROCESS_INIT;
 841
 842 int git_connection_is_socket(struct child_process *conn)
 843 {
 844         return conn == &no_fork;
 845 }
 846
 847 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
 848 {
 849         int sockfd = git_tcp_connect_sock(host, flags);
 850
 851         fd[0] = sockfd;
 852         fd[1] = dup(sockfd);
 853
 854         return &no_fork;
 855 }
 856
 857
 858 static char *git_proxy_command;
 859
 860 static int git_proxy_command_options(const char *var, const char *value,
 861                 void *cb)
 862 {
 863         if (!strcmp(var, "core.gitproxy")) {
 864                 const char *for_pos;
 865                 int matchlen = -1;
 866                 int hostlen;
 867                 const char *rhost_name = cb;
 868                 int rhost_len = strlen(rhost_name);
 869
 870                 if (git_proxy_command)
 871                         return 0;
 872                 if (!value)
 873                         return config_error_nonbool(var);
 874                 /* [core]
 875                  * ;# matches www.kernel.org as well
 876                  * gitproxy = netcatter-1 for kernel.org
 877                  * gitproxy = netcatter-2 for sample.xz
 878                  * gitproxy = netcatter-default
 879                  */
 880                 for_pos = strstr(value, " for ");
 881                 if (!for_pos)
 882                         /* matches everybody */
 883                         matchlen = strlen(value);
 884                 else {
 885                         hostlen = strlen(for_pos + 5);
 886                         if (rhost_len < hostlen)
 887                                 matchlen = -1;
 888                         else if (!strncmp(for_pos + 5,
 889                                           rhost_name + rhost_len - hostlen,
 890                                           hostlen) &&
 891                                  ((rhost_len == hostlen) ||
 892                                   rhost_name[rhost_len - hostlen -1] == '.'))
 893                                 matchlen = for_pos - value;
 894                         else
 895                                 matchlen = -1;
 896                 }
 897                 if (0 <= matchlen) {
 898                         /* core.gitproxy = none for kernel.org */
 899                         if (matchlen == 4 &&
 900                             !memcmp(value, "none", 4))
 901                                 matchlen = 0;
 902                         git_proxy_command = xmemdupz(value, matchlen);
 903                 }
 904                 return 0;
 905         }
 906
 907         return git_default_config(var, value, cb);
 908 }
 909
 910 static int git_use_proxy(const char *host)
 911 {
 912         git_proxy_command = getenv("GIT_PROXY_COMMAND");
 913         git_config(git_proxy_command_options, (void*)host);
 914         return (git_proxy_command && *git_proxy_command);
 915 }
 916
 917 static struct child_process *git_proxy_connect(int fd[2], char *host)
 918 {
 919         const char *port = STR(DEFAULT_GIT_PORT);
 920         struct child_process *proxy;
 921
 922         get_host_and_port(&host, &port);
 923
 924         if (looks_like_command_line_option(host))
 925                 die(_("strange hostname '%s' blocked"), host);
 926         if (looks_like_command_line_option(port))
 927                 die(_("strange port '%s' blocked"), port);
 928
 929         proxy = xmalloc(sizeof(*proxy));
 930         child_process_init(proxy);
 931         argv_array_push(&proxy->args, git_proxy_command);
 932         argv_array_push(&proxy->args, host);
 933         argv_array_push(&proxy->args, port);
 934         proxy->in = -1;
 935         proxy->out = -1;
 936         if (start_command(proxy))
 937                 die(_("cannot start proxy %s"), git_proxy_command);
 938         fd[0] = proxy->out; /* read from proxy stdout */
 939         fd[1] = proxy->in;  /* write to proxy stdin */
 940         return proxy;
 941 }
 942
 943 static char *get_port(char *host)
 944 {
 945         char *end;
 946         char *p = strchr(host, ':');
 947
 948         if (p) {
 949                 long port = strtol(p + 1, &end, 10);
 950                 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 951                         *p = '\0';
 952                         return p+1;
 953                 }
 954         }
 955
 956         return NULL;
 957 }
 958
 959 /*
 960  * Extract protocol and relevant parts from the specified connection URL.
 961  * The caller must free() the returned strings.
 962  */
 963 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
 964                                        char **ret_path)
 965 {
 966         char *url;
 967         char *host, *path;
 968         char *end;
 969         int separator = '/';
 970         enum protocol protocol = PROTO_LOCAL;
 971
 972         if (is_url(url_orig))
 973                 url = url_decode(url_orig);
 974         else
 975                 url = xstrdup(url_orig);
 976
 977         host = strstr(url, "://");
 978         if (host) {
 979                 *host = '\0';
 980                 protocol = get_protocol(url);
 981                 host += 3;
 982         } else {
 983                 host = url;
 984                 if (!url_is_local_not_ssh(url)) {
 985                         protocol = PROTO_SSH;
 986                         separator = ':';
 987                 }
 988         }
 989
 990         /*
 991          * Don't do destructive transforms as protocol code does
 992          * '[]' unwrapping in get_host_and_port()
 993          */
 994         end = host_end(&host, 0);
 995
 996         if (protocol == PROTO_LOCAL)
 997                 path = end;
 998         else if (protocol == PROTO_FILE && *host != '/' &&
 999                  !has_dos_drive_prefix(host) &&
1000                  offset_1st_component(host - 2) > 1)
1001                 path = host - 2; /* include the leading "//" */
1002         else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
1003                 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
1004         else
1005                 path = strchr(end, separator);
1006
1007         if (!path || !*path)
1008                 die(_("no path specified; see 'git help pull' for valid url syntax"));
1009
1010         /*
1011          * null-terminate hostname and point path to ~ for URL's like this:
1012          *    ssh://host.xz/~user/repo
1013          */
1014
1015         end = path; /* Need to \0 terminate host here */
1016         if (separator == ':')
1017                 path++; /* path starts after ':' */
1018         if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
1019                 if (path[1] == '~')
1020                         path++;
1021         }
1022
1023         path = xstrdup(path);
1024         *end = '\0';
1025
1026         *ret_host = xstrdup(host);
1027         *ret_path = path;
1028         free(url);
1029         return protocol;
1030 }
1031
1032 static const char *get_ssh_command(void)
1033 {
1034         const char *ssh;
1035
1036         if ((ssh = getenv("GIT_SSH_COMMAND")))
1037                 return ssh;
1038
1039         if (!git_config_get_string_const("core.sshcommand", &ssh))
1040                 return ssh;
1041
1042         return NULL;
1043 }
1044
1045 enum ssh_variant {
1046         VARIANT_AUTO,
1047         VARIANT_SIMPLE,
1048         VARIANT_SSH,
1049         VARIANT_PLINK,
1050         VARIANT_PUTTY,
1051         VARIANT_TORTOISEPLINK,
1052 };
1053
1054 static void override_ssh_variant(enum ssh_variant *ssh_variant)
1055 {
1056         const char *variant = getenv("GIT_SSH_VARIANT");
1057
1058         if (!variant && git_config_get_string_const("ssh.variant", &variant))
1059                 return;
1060
1061         if (!strcmp(variant, "auto"))
1062                 *ssh_variant = VARIANT_AUTO;
1063         else if (!strcmp(variant, "plink"))
1064                 *ssh_variant = VARIANT_PLINK;
1065         else if (!strcmp(variant, "putty"))
1066                 *ssh_variant = VARIANT_PUTTY;
1067         else if (!strcmp(variant, "tortoiseplink"))
1068                 *ssh_variant = VARIANT_TORTOISEPLINK;
1069         else if (!strcmp(variant, "simple"))
1070                 *ssh_variant = VARIANT_SIMPLE;
1071         else
1072                 *ssh_variant = VARIANT_SSH;
1073 }
1074
1075 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
1076                                               int is_cmdline)
1077 {
1078         enum ssh_variant ssh_variant = VARIANT_AUTO;
1079         const char *variant;
1080         char *p = NULL;
1081
1082         override_ssh_variant(&ssh_variant);
1083
1084         if (ssh_variant != VARIANT_AUTO)
1085                 return ssh_variant;
1086
1087         if (!is_cmdline) {
1088                 p = xstrdup(ssh_command);
1089                 variant = basename(p);
1090         } else {
1091                 const char **ssh_argv;
1092
1093                 p = xstrdup(ssh_command);
1094                 if (split_cmdline(p, &ssh_argv) > 0) {
1095                         variant = basename((char *)ssh_argv[0]);
1096                         /*
1097                          * At this point, variant points into the buffer
1098                          * referenced by p, hence we do not need ssh_argv
1099                          * any longer.
1100                          */
1101                         free(ssh_argv);
1102                 } else {
1103                         free(p);
1104                         return ssh_variant;
1105                 }
1106         }
1107
1108         if (!strcasecmp(variant, "ssh") ||
1109             !strcasecmp(variant, "ssh.exe"))
1110                 ssh_variant = VARIANT_SSH;
1111         else if (!strcasecmp(variant, "plink") ||
1112                  !strcasecmp(variant, "plink.exe"))
1113                 ssh_variant = VARIANT_PLINK;
1114         else if (!strcasecmp(variant, "tortoiseplink") ||
1115                  !strcasecmp(variant, "tortoiseplink.exe"))
1116                 ssh_variant = VARIANT_TORTOISEPLINK;
1117
1118         free(p);
1119         return ssh_variant;
1120 }
1121
1122 /*
1123  * Open a connection using Git's native protocol.
1124  *
1125  * The caller is responsible for freeing hostandport, but this function may
1126  * modify it (for example, to truncate it to remove the port part).
1127  */
1128 static struct child_process *git_connect_git(int fd[2], char *hostandport,
1129                                              const char *path, const char *prog,
1130                                              enum protocol_version version,
1131                                              int flags)
1132 {
1133         struct child_process *conn;
1134         struct strbuf request = STRBUF_INIT;
1135         /*
1136          * Set up virtual host information based on where we will
1137          * connect, unless the user has overridden us in
1138          * the environment.
1139          */
1140         char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
1141         if (target_host)
1142                 target_host = xstrdup(target_host);
1143         else
1144                 target_host = xstrdup(hostandport);
1145
1146         transport_check_allowed("git");
1147
1148         /*
1149          * These underlying connection commands die() if they
1150          * cannot connect.
1151          */
1152         if (git_use_proxy(hostandport))
1153                 conn = git_proxy_connect(fd, hostandport);
1154         else
1155                 conn = git_tcp_connect(fd, hostandport, flags);
1156         /*
1157          * Separate original protocol components prog and path
1158          * from extended host header with a NUL byte.
1159          *
1160          * Note: Do not add any other headers here!  Doing so
1161          * will cause older git-daemon servers to crash.
1162          */
1163         strbuf_addf(&request,
1164                     "%s %s%chost=%s%c",
1165                     prog, path, 0,
1166                     target_host, 0);
1167
1168         /* If using a new version put that stuff here after a second null byte */
1169         if (version > 0) {
1170                 strbuf_addch(&request, '\0');
1171                 strbuf_addf(&request, "version=%d%c",
1172                             version, '\0');
1173         }
1174
1175         packet_write(fd[1], request.buf, request.len);
1176
1177         free(target_host);
1178         strbuf_release(&request);
1179         return conn;
1180 }
1181
1182 /*
1183  * Append the appropriate environment variables to `env` and options to
1184  * `args` for running ssh in Git's SSH-tunneled transport.
1185  */
1186 static void push_ssh_options(struct argv_array *args, struct argv_array *env,
1187                              enum ssh_variant variant, const char *port,
1188                              enum protocol_version version, int flags)
1189 {
1190         if (variant == VARIANT_SSH &&
1191             version > 0) {
1192                 argv_array_push(args, "-o");
1193                 argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
1194                 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1195                                  version);
1196         }
1197
1198         if (flags & CONNECT_IPV4) {
1199                 switch (variant) {
1200                 case VARIANT_AUTO:
1201                         BUG("VARIANT_AUTO passed to push_ssh_options");
1202                 case VARIANT_SIMPLE:
1203                         die(_("ssh variant 'simple' does not support -4"));
1204                 case VARIANT_SSH:
1205                 case VARIANT_PLINK:
1206                 case VARIANT_PUTTY:
1207                 case VARIANT_TORTOISEPLINK:
1208                         argv_array_push(args, "-4");
1209                 }
1210         } else if (flags & CONNECT_IPV6) {
1211                 switch (variant) {
1212                 case VARIANT_AUTO:
1213                         BUG("VARIANT_AUTO passed to push_ssh_options");
1214                 case VARIANT_SIMPLE:
1215                         die(_("ssh variant 'simple' does not support -6"));
1216                 case VARIANT_SSH:
1217                 case VARIANT_PLINK:
1218                 case VARIANT_PUTTY:
1219                 case VARIANT_TORTOISEPLINK:
1220                         argv_array_push(args, "-6");
1221                 }
1222         }
1223
1224         if (variant == VARIANT_TORTOISEPLINK)
1225                 argv_array_push(args, "-batch");
1226
1227         if (port) {
1228                 switch (variant) {
1229                 case VARIANT_AUTO:
1230                         BUG("VARIANT_AUTO passed to push_ssh_options");
1231                 case VARIANT_SIMPLE:
1232                         die(_("ssh variant 'simple' does not support setting port"));
1233                 case VARIANT_SSH:
1234                         argv_array_push(args, "-p");
1235                         break;
1236                 case VARIANT_PLINK:
1237                 case VARIANT_PUTTY:
1238                 case VARIANT_TORTOISEPLINK:
1239                         argv_array_push(args, "-P");
1240                 }
1241
1242                 argv_array_push(args, port);
1243         }
1244 }
1245
1246 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
1247 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
1248                           const char *port, enum protocol_version version,
1249                           int flags)
1250 {
1251         const char *ssh;
1252         enum ssh_variant variant;
1253
1254         if (looks_like_command_line_option(ssh_host))
1255                 die(_("strange hostname '%s' blocked"), ssh_host);
1256
1257         ssh = get_ssh_command();
1258         if (ssh) {
1259                 variant = determine_ssh_variant(ssh, 1);
1260         } else {
1261                 /*
1262                  * GIT_SSH is the no-shell version of
1263                  * GIT_SSH_COMMAND (and must remain so for
1264                  * historical compatibility).
1265                  */
1266                 conn->use_shell = 0;
1267
1268                 ssh = getenv("GIT_SSH");
1269                 if (!ssh)
1270                         ssh = "ssh";
1271                 variant = determine_ssh_variant(ssh, 0);
1272         }
1273
1274         if (variant == VARIANT_AUTO) {
1275                 struct child_process detect = CHILD_PROCESS_INIT;
1276
1277                 detect.use_shell = conn->use_shell;
1278                 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1279
1280                 argv_array_push(&detect.args, ssh);
1281                 argv_array_push(&detect.args, "-G");
1282                 push_ssh_options(&detect.args, &detect.env_array,
1283                                  VARIANT_SSH, port, version, flags);
1284                 argv_array_push(&detect.args, ssh_host);
1285
1286                 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1287         }
1288
1289         argv_array_push(&conn->args, ssh);
1290         push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
1291         argv_array_push(&conn->args, ssh_host);
1292 }
1293
1294 /*
1295  * This returns the dummy child_process `no_fork` if the transport protocol
1296  * does not need fork(2), or a struct child_process object if it does.  Once
1297  * done, finish the connection with finish_connect() with the value returned
1298  * from this function (it is safe to call finish_connect() with NULL to
1299  * support the former case).
1300  *
1301  * If it returns, the connect is successful; it just dies on errors (this
1302  * will hopefully be changed in a libification effort, to return NULL when
1303  * the connection failed).
1304  */
1305 struct child_process *git_connect(int fd[2], const char *url,
1306                                   const char *prog, int flags)
1307 {
1308         char *hostandport, *path;
1309         struct child_process *conn;
1310         enum protocol protocol;
1311         enum protocol_version version = get_protocol_version_config();
1312
1313         /*
1314          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
1315          * to perform a push, then fallback to v0 since the client doesn't know
1316          * how to push yet using v2.
1317          */
1318         if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
1319                 version = protocol_v0;
1320
1321         /* Without this we cannot rely on waitpid() to tell
1322          * what happened to our children.
1323          */
1324         signal(SIGCHLD, SIG_DFL);
1325
1326         protocol = parse_connect_url(url, &hostandport, &path);
1327         if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1328                 printf("Diag: url=%s\n", url ? url : "NULL");
1329                 printf("Diag: protocol=%s\n", prot_name(protocol));
1330                 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1331                 printf("Diag: path=%s\n", path ? path : "NULL");
1332                 conn = NULL;
1333         } else if (protocol == PROTO_GIT) {
1334                 conn = git_connect_git(fd, hostandport, path, prog, version, flags);
1335                 conn->trace2_child_class = "transport/git";
1336         } else {
1337                 struct strbuf cmd = STRBUF_INIT;
1338                 const char *const *var;
1339
1340                 conn = xmalloc(sizeof(*conn));
1341                 child_process_init(conn);
1342
1343                 if (looks_like_command_line_option(path))
1344                         die(_("strange pathname '%s' blocked"), path);
1345
1346                 strbuf_addstr(&cmd, prog);
1347                 strbuf_addch(&cmd, ' ');
1348                 sq_quote_buf(&cmd, path);
1349
1350                 /* remove repo-local variables from the environment */
1351                 for (var = local_repo_env; *var; var++)
1352                         argv_array_push(&conn->env_array, *var);
1353
1354                 conn->use_shell = 1;
1355                 conn->in = conn->out = -1;
1356                 if (protocol == PROTO_SSH) {
1357                         char *ssh_host = hostandport;
1358                         const char *port = NULL;
1359                         transport_check_allowed("ssh");
1360                         get_host_and_port(&ssh_host, &port);
1361
1362                         if (!port)
1363                                 port = get_port(ssh_host);
1364
1365                         if (flags & CONNECT_DIAG_URL) {
1366                                 printf("Diag: url=%s\n", url ? url : "NULL");
1367                                 printf("Diag: protocol=%s\n", prot_name(protocol));
1368                                 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1369                                 printf("Diag: port=%s\n", port ? port : "NONE");
1370                                 printf("Diag: path=%s\n", path ? path : "NULL");
1371
1372                                 free(hostandport);
1373                                 free(path);
1374                                 free(conn);
1375                                 strbuf_release(&cmd);
1376                                 return NULL;
1377                         }
1378                         conn->trace2_child_class = "transport/ssh";
1379                         fill_ssh_args(conn, ssh_host, port, version, flags);
1380                 } else {
1381                         transport_check_allowed("file");
1382                         conn->trace2_child_class = "transport/file";
1383                         if (version > 0) {
1384                                 argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1385                                                  version);
1386                         }
1387                 }
1388                 argv_array_push(&conn->args, cmd.buf);
1389
1390                 if (start_command(conn))
1391                         die(_("unable to fork"));
1392
1393                 fd[0] = conn->out; /* read from child's stdout */
1394                 fd[1] = conn->in;  /* write to child's stdin */
1395                 strbuf_release(&cmd);
1396         }
1397         free(hostandport);
1398         free(path);
1399         return conn;
1400 }
1401
1402 int finish_connect(struct child_process *conn)
1403 {
1404         int code;
1405         if (!conn || git_connection_is_socket(conn))
1406                 return 0;
1407
1408         code = finish_command(conn);
1409         free(conn);
1410         return code;
1411 }