Andrew's git / gitweb.git / connect.c
?
connect.con commit imap-send: move #ifdef around (1e1fe52)
   1#include "git-compat-util.h"
   2#include "cache.h"
   3#include "pkt-line.h"
   4#include "quote.h"
   5#include "refs.h"
   6#include "run-command.h"
   7#include "remote.h"
   8#include "url.h"
   9
  10static char *server_capabilities;
  11
  12static int check_ref(const char *name, int len, unsigned int flags)
  13{
  14        if (!flags)
  15                return 1;
  16
  17        if (len < 5 || memcmp(name, "refs/", 5))
  18                return 0;
  19
  20        /* Skip the "refs/" part */
  21        name += 5;
  22        len -= 5;
  23
  24        /* REF_NORMAL means that we don't want the magic fake tag refs */
  25        if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
  26                return 0;
  27
  28        /* REF_HEADS means that we want regular branch heads */
  29        if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
  30                return 1;
  31
  32        /* REF_TAGS means that we want tags */
  33        if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
  34                return 1;
  35
  36        /* All type bits clear means that we are ok with anything */
  37        return !(flags & ~REF_NORMAL);
  38}
  39
  40int check_ref_type(const struct ref *ref, int flags)
  41{
  42        return check_ref(ref->name, strlen(ref->name), flags);
  43}
  44
  45static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
  46{
  47        ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
  48        hashcpy(&(extra->array[extra->nr][0]), sha1);
  49        extra->nr++;
  50}
  51
  52/*
  53 * Read all the refs from the other end
  54 */
  55struct ref **get_remote_heads(int in, struct ref **list,
  56                              int nr_match, char **match,
  57                              unsigned int flags,
  58                              struct extra_have_objects *extra_have)
  59{
  60        *list = NULL;
  61        for (;;) {
  62                struct ref *ref;
  63                unsigned char old_sha1[20];
  64                static char buffer[1000];
  65                char *name;
  66                int len, name_len;
  67
  68                len = packet_read_line(in, buffer, sizeof(buffer));
  69                if (!len)
  70                        break;
  71                if (buffer[len-1] == '\n')
  72                        buffer[--len] = 0;
  73
  74                if (len > 4 && !prefixcmp(buffer, "ERR "))
  75                        die("remote error: %s", buffer + 4);
  76
  77                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
  78                        die("protocol error: expected sha/ref, got '%s'", buffer);
  79                name = buffer + 41;
  80
  81                name_len = strlen(name);
  82                if (len != name_len + 41) {
  83                        free(server_capabilities);
  84                        server_capabilities = xstrdup(name + name_len + 1);
  85                }
  86
  87                if (extra_have &&
  88                    name_len == 5 && !memcmp(".have", name, 5)) {
  89                        add_extra_have(extra_have, old_sha1);
  90                        continue;
  91                }
  92
  93                if (!check_ref(name, name_len, flags))
  94                        continue;
  95                if (nr_match && !path_match(name, nr_match, match))
  96                        continue;
  97                ref = alloc_ref(buffer + 41);
  98                hashcpy(ref->old_sha1, old_sha1);
  99                *list = ref;
 100                list = &ref->next;
 101        }
 102        return list;
 103}
 104
 105int server_supports(const char *feature)
 106{
 107        return server_capabilities &&
 108                strstr(server_capabilities, feature) != NULL;
 109}
 110
 111int path_match(const char *path, int nr, char **match)
 112{
 113        int i;
 114        int pathlen = strlen(path);
 115
 116        for (i = 0; i < nr; i++) {
 117                char *s = match[i];
 118                int len = strlen(s);
 119
 120                if (!len || len > pathlen)
 121                        continue;
 122                if (memcmp(path + pathlen - len, s, len))
 123                        continue;
 124                if (pathlen > len && path[pathlen - len - 1] != '/')
 125                        continue;
 126                *s = 0;
 127                return (i + 1);
 128        }
 129        return 0;
 130}
 131
 132enum protocol {
 133        PROTO_LOCAL = 1,
 134        PROTO_SSH,
 135        PROTO_GIT
 136};
 137
 138static enum protocol get_protocol(const char *name)
 139{
 140        if (!strcmp(name, "ssh"))
 141                return PROTO_SSH;
 142        if (!strcmp(name, "git"))
 143                return PROTO_GIT;
 144        if (!strcmp(name, "git+ssh"))
 145                return PROTO_SSH;
 146        if (!strcmp(name, "ssh+git"))
 147                return PROTO_SSH;
 148        if (!strcmp(name, "file"))
 149                return PROTO_LOCAL;
 150        die("I don't handle protocol '%s'", name);
 151}
 152
 153#define STR_(s) # s
 154#define STR(s)  STR_(s)
 155
 156static void get_host_and_port(char **host, const char **port)
 157{
 158        char *colon, *end;
 159
 160        if (*host[0] == '[') {
 161                end = strchr(*host + 1, ']');
 162                if (end) {
 163                        *end = 0;
 164                        end++;
 165                        (*host)++;
 166                } else
 167                        end = *host;
 168        } else
 169                end = *host;
 170        colon = strchr(end, ':');
 171
 172        if (colon) {
 173                *colon = 0;
 174                *port = colon + 1;
 175        }
 176}
 177
 178#ifndef NO_IPV6
 179
 180static const char *ai_name(const struct addrinfo *ai)
 181{
 182        static char addr[NI_MAXHOST];
 183        if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 184                        NI_NUMERICHOST) != 0)
 185                strcpy(addr, "(unknown)");
 186
 187        return addr;
 188}
 189
 190/*
 191 * Returns a connected socket() fd, or else die()s.
 192 */
 193static int git_tcp_connect_sock(char *host, int flags)
 194{
 195        struct strbuf error_message = STRBUF_INIT;
 196        int sockfd = -1;
 197        const char *port = STR(DEFAULT_GIT_PORT);
 198        struct addrinfo hints, *ai0, *ai;
 199        int gai;
 200        int cnt = 0;
 201
 202        get_host_and_port(&host, &port);
 203        if (!*port)
 204                port = "<none>";
 205
 206        memset(&hints, 0, sizeof(hints));
 207        hints.ai_socktype = SOCK_STREAM;
 208        hints.ai_protocol = IPPROTO_TCP;
 209
 210        if (flags & CONNECT_VERBOSE)
 211                fprintf(stderr, "Looking up %s ... ", host);
 212
 213        gai = getaddrinfo(host, port, &hints, &ai);
 214        if (gai)
 215                die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
 216
 217        if (flags & CONNECT_VERBOSE)
 218                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 219
 220        for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 221                sockfd = socket(ai->ai_family,
 222                                ai->ai_socktype, ai->ai_protocol);
 223                if ((sockfd < 0) ||
 224                    (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 225                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 226                                    host, cnt, ai_name(ai), strerror(errno));
 227                        if (0 <= sockfd)
 228                                close(sockfd);
 229                        sockfd = -1;
 230                        continue;
 231                }
 232                if (flags & CONNECT_VERBOSE)
 233                        fprintf(stderr, "%s ", ai_name(ai));
 234                break;
 235        }
 236
 237        freeaddrinfo(ai0);
 238
 239        if (sockfd < 0)
 240                die("unable to connect to %s:\n%s", host, error_message.buf);
 241
 242        if (flags & CONNECT_VERBOSE)
 243                fprintf(stderr, "done.\n");
 244
 245        strbuf_release(&error_message);
 246
 247        return sockfd;
 248}
 249
 250#else /* NO_IPV6 */
 251
 252/*
 253 * Returns a connected socket() fd, or else die()s.
 254 */
 255static int git_tcp_connect_sock(char *host, int flags)
 256{
 257        int sockfd = -1, saved_errno = 0;
 258        const char *port = STR(DEFAULT_GIT_PORT);
 259        char *ep;
 260        struct hostent *he;
 261        struct sockaddr_in sa;
 262        char **ap;
 263        unsigned int nport;
 264        int cnt;
 265
 266        get_host_and_port(&host, &port);
 267
 268        if (flags & CONNECT_VERBOSE)
 269                fprintf(stderr, "Looking up %s ... ", host);
 270
 271        he = gethostbyname(host);
 272        if (!he)
 273                die("Unable to look up %s (%s)", host, hstrerror(h_errno));
 274        nport = strtoul(port, &ep, 10);
 275        if ( ep == port || *ep ) {
 276                /* Not numeric */
 277                struct servent *se = getservbyname(port,"tcp");
 278                if ( !se )
 279                        die("Unknown port %s", port);
 280                nport = se->s_port;
 281        }
 282
 283        if (flags & CONNECT_VERBOSE)
 284                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 285
 286        for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 287                sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 288                if (sockfd < 0) {
 289                        saved_errno = errno;
 290                        continue;
 291                }
 292
 293                memset(&sa, 0, sizeof sa);
 294                sa.sin_family = he->h_addrtype;
 295                sa.sin_port = htons(nport);
 296                memcpy(&sa.sin_addr, *ap, he->h_length);
 297
 298                if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 299                        saved_errno = errno;
 300                        fprintf(stderr, "%s[%d: %s]: errno=%s\n",
 301                                host,
 302                                cnt,
 303                                inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 304                                strerror(saved_errno));
 305                        close(sockfd);
 306                        sockfd = -1;
 307                        continue;
 308                }
 309                if (flags & CONNECT_VERBOSE)
 310                        fprintf(stderr, "%s ",
 311                                inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 312                break;
 313        }
 314
 315        if (sockfd < 0)
 316                die("unable to connect a socket (%s)", strerror(saved_errno));
 317
 318        if (flags & CONNECT_VERBOSE)
 319                fprintf(stderr, "done.\n");
 320
 321        return sockfd;
 322}
 323
 324#endif /* NO_IPV6 */
 325
 326
 327static void git_tcp_connect(int fd[2], char *host, int flags)
 328{
 329        int sockfd = git_tcp_connect_sock(host, flags);
 330
 331        fd[0] = sockfd;
 332        fd[1] = dup(sockfd);
 333}
 334
 335
 336static char *git_proxy_command;
 337
 338static int git_proxy_command_options(const char *var, const char *value,
 339                void *cb)
 340{
 341        if (!strcmp(var, "core.gitproxy")) {
 342                const char *for_pos;
 343                int matchlen = -1;
 344                int hostlen;
 345                const char *rhost_name = cb;
 346                int rhost_len = strlen(rhost_name);
 347
 348                if (git_proxy_command)
 349                        return 0;
 350                if (!value)
 351                        return config_error_nonbool(var);
 352                /* [core]
 353                 * ;# matches www.kernel.org as well
 354                 * gitproxy = netcatter-1 for kernel.org
 355                 * gitproxy = netcatter-2 for sample.xz
 356                 * gitproxy = netcatter-default
 357                 */
 358                for_pos = strstr(value, " for ");
 359                if (!for_pos)
 360                        /* matches everybody */
 361                        matchlen = strlen(value);
 362                else {
 363                        hostlen = strlen(for_pos + 5);
 364                        if (rhost_len < hostlen)
 365                                matchlen = -1;
 366                        else if (!strncmp(for_pos + 5,
 367                                          rhost_name + rhost_len - hostlen,
 368                                          hostlen) &&
 369                                 ((rhost_len == hostlen) ||
 370                                  rhost_name[rhost_len - hostlen -1] == '.'))
 371                                matchlen = for_pos - value;
 372                        else
 373                                matchlen = -1;
 374                }
 375                if (0 <= matchlen) {
 376                        /* core.gitproxy = none for kernel.org */
 377                        if (matchlen == 4 &&
 378                            !memcmp(value, "none", 4))
 379                                matchlen = 0;
 380                        git_proxy_command = xmemdupz(value, matchlen);
 381                }
 382                return 0;
 383        }
 384
 385        return git_default_config(var, value, cb);
 386}
 387
 388static int git_use_proxy(const char *host)
 389{
 390        git_proxy_command = getenv("GIT_PROXY_COMMAND");
 391        git_config(git_proxy_command_options, (void*)host);
 392        return (git_proxy_command && *git_proxy_command);
 393}
 394
 395static struct child_process *git_proxy_connect(int fd[2], char *host)
 396{
 397        const char *port = STR(DEFAULT_GIT_PORT);
 398        const char **argv;
 399        struct child_process *proxy;
 400
 401        get_host_and_port(&host, &port);
 402
 403        argv = xmalloc(sizeof(*argv) * 4);
 404        argv[0] = git_proxy_command;
 405        argv[1] = host;
 406        argv[2] = port;
 407        argv[3] = NULL;
 408        proxy = xcalloc(1, sizeof(*proxy));
 409        proxy->argv = argv;
 410        proxy->in = -1;
 411        proxy->out = -1;
 412        if (start_command(proxy))
 413                die("cannot start proxy %s", argv[0]);
 414        fd[0] = proxy->out; /* read from proxy stdout */
 415        fd[1] = proxy->in;  /* write to proxy stdin */
 416        return proxy;
 417}
 418
 419#define MAX_CMD_LEN 1024
 420
 421static char *get_port(char *host)
 422{
 423        char *end;
 424        char *p = strchr(host, ':');
 425
 426        if (p) {
 427                long port = strtol(p + 1, &end, 10);
 428                if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 429                        *p = '\0';
 430                        return p+1;
 431                }
 432        }
 433
 434        return NULL;
 435}
 436
 437static struct child_process no_fork;
 438
 439/*
 440 * This returns a dummy child_process if the transport protocol does not
 441 * need fork(2), or a struct child_process object if it does.  Once done,
 442 * finish the connection with finish_connect() with the value returned from
 443 * this function (it is safe to call finish_connect() with NULL to support
 444 * the former case).
 445 *
 446 * If it returns, the connect is successful; it just dies on errors (this
 447 * will hopefully be changed in a libification effort, to return NULL when
 448 * the connection failed).
 449 */
 450struct child_process *git_connect(int fd[2], const char *url_orig,
 451                                  const char *prog, int flags)
 452{
 453        char *url;
 454        char *host, *path;
 455        char *end;
 456        int c;
 457        struct child_process *conn = &no_fork;
 458        enum protocol protocol = PROTO_LOCAL;
 459        int free_path = 0;
 460        char *port = NULL;
 461        const char **arg;
 462        struct strbuf cmd;
 463
 464        /* Without this we cannot rely on waitpid() to tell
 465         * what happened to our children.
 466         */
 467        signal(SIGCHLD, SIG_DFL);
 468
 469        if (is_url(url_orig))
 470                url = url_decode(url_orig);
 471        else
 472                url = xstrdup(url_orig);
 473
 474        host = strstr(url, "://");
 475        if (host) {
 476                *host = '\0';
 477                protocol = get_protocol(url);
 478                host += 3;
 479                c = '/';
 480        } else {
 481                host = url;
 482                c = ':';
 483        }
 484
 485        /*
 486         * Don't do destructive transforms with git:// as that
 487         * protocol code does '[]' unwrapping of its own.
 488         */
 489        if (host[0] == '[') {
 490                end = strchr(host + 1, ']');
 491                if (end) {
 492                        if (protocol != PROTO_GIT) {
 493                                *end = 0;
 494                                host++;
 495                        }
 496                        end++;
 497                } else
 498                        end = host;
 499        } else
 500                end = host;
 501
 502        path = strchr(end, c);
 503        if (path && !has_dos_drive_prefix(end)) {
 504                if (c == ':') {
 505                        protocol = PROTO_SSH;
 506                        *path++ = '\0';
 507                }
 508        } else
 509                path = end;
 510
 511        if (!path || !*path)
 512                die("No path specified. See 'man git-pull' for valid url syntax");
 513
 514        /*
 515         * null-terminate hostname and point path to ~ for URL's like this:
 516         *    ssh://host.xz/~user/repo
 517         */
 518        if (protocol != PROTO_LOCAL && host != url) {
 519                char *ptr = path;
 520                if (path[1] == '~')
 521                        path++;
 522                else {
 523                        path = xstrdup(ptr);
 524                        free_path = 1;
 525                }
 526
 527                *ptr = '\0';
 528        }
 529
 530        /*
 531         * Add support for ssh port: ssh://host.xy:<port>/...
 532         */
 533        if (protocol == PROTO_SSH && host != url)
 534                port = get_port(host);
 535
 536        if (protocol == PROTO_GIT) {
 537                /* These underlying connection commands die() if they
 538                 * cannot connect.
 539                 */
 540                char *target_host = xstrdup(host);
 541                if (git_use_proxy(host))
 542                        conn = git_proxy_connect(fd, host);
 543                else
 544                        git_tcp_connect(fd, host, flags);
 545                /*
 546                 * Separate original protocol components prog and path
 547                 * from extended host header with a NUL byte.
 548                 *
 549                 * Note: Do not add any other headers here!  Doing so
 550                 * will cause older git-daemon servers to crash.
 551                 */
 552                packet_write(fd[1],
 553                             "%s %s%chost=%s%c",
 554                             prog, path, 0,
 555                             target_host, 0);
 556                free(target_host);
 557                free(url);
 558                if (free_path)
 559                        free(path);
 560                return conn;
 561        }
 562
 563        conn = xcalloc(1, sizeof(*conn));
 564
 565        strbuf_init(&cmd, MAX_CMD_LEN);
 566        strbuf_addstr(&cmd, prog);
 567        strbuf_addch(&cmd, ' ');
 568        sq_quote_buf(&cmd, path);
 569        if (cmd.len >= MAX_CMD_LEN)
 570                die("command line too long");
 571
 572        conn->in = conn->out = -1;
 573        conn->argv = arg = xcalloc(7, sizeof(*arg));
 574        if (protocol == PROTO_SSH) {
 575                const char *ssh = getenv("GIT_SSH");
 576                int putty = ssh && strcasestr(ssh, "plink");
 577                if (!ssh) ssh = "ssh";
 578
 579                *arg++ = ssh;
 580                if (putty && !strcasestr(ssh, "tortoiseplink"))
 581                        *arg++ = "-batch";
 582                if (port) {
 583                        /* P is for PuTTY, p is for OpenSSH */
 584                        *arg++ = putty ? "-P" : "-p";
 585                        *arg++ = port;
 586                }
 587                *arg++ = host;
 588        }
 589        else {
 590                /* remove repo-local variables from the environment */
 591                conn->env = local_repo_env;
 592                conn->use_shell = 1;
 593        }
 594        *arg++ = cmd.buf;
 595        *arg = NULL;
 596
 597        if (start_command(conn))
 598                die("unable to fork");
 599
 600        fd[0] = conn->out; /* read from child's stdout */
 601        fd[1] = conn->in;  /* write to child's stdin */
 602        strbuf_release(&cmd);
 603        free(url);
 604        if (free_path)
 605                free(path);
 606        return conn;
 607}
 608
 609int git_connection_is_socket(struct child_process *conn)
 610{
 611        return conn == &no_fork;
 612}
 613
 614int finish_connect(struct child_process *conn)
 615{
 616        int code;
 617        if (!conn || git_connection_is_socket(conn))
 618                return 0;
 619
 620        code = finish_command(conn);
 621        free(conn->argv);
 622        free(conn);
 623        return code;
 624}
 625
 626char *git_getpass(const char *prompt)
 627{
 628        const char *askpass;
 629        struct child_process pass;
 630        const char *args[3];
 631        static struct strbuf buffer = STRBUF_INIT;
 632
 633        askpass = getenv("GIT_ASKPASS");
 634        if (!askpass)
 635                askpass = askpass_program;
 636        if (!askpass)
 637                askpass = getenv("SSH_ASKPASS");
 638        if (!askpass || !(*askpass)) {
 639                char *result = getpass(prompt);
 640                if (!result)
 641                        die_errno("Could not read password");
 642                return result;
 643        }
 644
 645        args[0] = askpass;
 646        args[1] = prompt;
 647        args[2] = NULL;
 648
 649        memset(&pass, 0, sizeof(pass));
 650        pass.argv = args;
 651        pass.out = -1;
 652
 653        if (start_command(&pass))
 654                exit(1);
 655
 656        strbuf_reset(&buffer);
 657        if (strbuf_read(&buffer, pass.out, 20) < 0)
 658                die("failed to read password from %s\n", askpass);
 659
 660        close(pass.out);
 661
 662        if (finish_command(&pass))
 663                exit(1);
 664
 665        strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
 666
 667        return buffer.buf;
 668}