Andrew's git - gitweb.git/blob

48df90bfe56068109476ec62fb8209db20c4e8cf
   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_refname_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                              unsigned int flags,
  57                              struct extra_have_objects *extra_have)
  58{
  59        *list = NULL;
  60        for (;;) {
  61                struct ref *ref;
  62                unsigned char old_sha1[20];
  63                static char buffer[1000];
  64                char *name;
  65                int len, name_len;
  66
  67                len = packet_read_line(in, buffer, sizeof(buffer));
  68                if (!len)
  69                        break;
  70                if (buffer[len-1] == '\n')
  71                        buffer[--len] = 0;
  72
  73                if (len > 4 && !prefixcmp(buffer, "ERR "))
  74                        die("remote error: %s", buffer + 4);
  75
  76                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
  77                        die("protocol error: expected sha/ref, got '%s'", buffer);
  78                name = buffer + 41;
  79
  80                name_len = strlen(name);
  81                if (len != name_len + 41) {
  82                        free(server_capabilities);
  83                        server_capabilities = xstrdup(name + name_len + 1);
  84                }
  85
  86                if (extra_have &&
  87                    name_len == 5 && !memcmp(".have", name, 5)) {
  88                        add_extra_have(extra_have, old_sha1);
  89                        continue;
  90                }
  91
  92                if (!check_ref(name, name_len, flags))
  93                        continue;
  94                ref = alloc_ref(buffer + 41);
  95                hashcpy(ref->old_sha1, old_sha1);
  96                *list = ref;
  97                list = &ref->next;
  98        }
  99        return list;
 100}
 101
 102int server_supports(const char *feature)
 103{
 104        return server_capabilities &&
 105                strstr(server_capabilities, feature) != NULL;
 106}
 107
 108int path_match(const char *path, int nr, char **match)
 109{
 110        int i;
 111        int pathlen = strlen(path);
 112
 113        for (i = 0; i < nr; i++) {
 114                char *s = match[i];
 115                int len = strlen(s);
 116
 117                if (!len || len > pathlen)
 118                        continue;
 119                if (memcmp(path + pathlen - len, s, len))
 120                        continue;
 121                if (pathlen > len && path[pathlen - len - 1] != '/')
 122                        continue;
 123                *s = 0;
 124                return (i + 1);
 125        }
 126        return 0;
 127}
 128
 129enum protocol {
 130        PROTO_LOCAL = 1,
 131        PROTO_SSH,
 132        PROTO_GIT
 133};
 134
 135static enum protocol get_protocol(const char *name)
 136{
 137        if (!strcmp(name, "ssh"))
 138                return PROTO_SSH;
 139        if (!strcmp(name, "git"))
 140                return PROTO_GIT;
 141        if (!strcmp(name, "git+ssh"))
 142                return PROTO_SSH;
 143        if (!strcmp(name, "ssh+git"))
 144                return PROTO_SSH;
 145        if (!strcmp(name, "file"))
 146                return PROTO_LOCAL;
 147        die("I don't handle protocol '%s'", name);
 148}
 149
 150#define STR_(s) # s
 151#define STR(s)  STR_(s)
 152
 153static void get_host_and_port(char **host, const char **port)
 154{
 155        char *colon, *end;
 156
 157        if (*host[0] == '[') {
 158                end = strchr(*host + 1, ']');
 159                if (end) {
 160                        *end = 0;
 161                        end++;
 162                        (*host)++;
 163                } else
 164                        end = *host;
 165        } else
 166                end = *host;
 167        colon = strchr(end, ':');
 168
 169        if (colon) {
 170                *colon = 0;
 171                *port = colon + 1;
 172        }
 173}
 174
 175#ifndef NO_IPV6
 176
 177static const char *ai_name(const struct addrinfo *ai)
 178{
 179        static char addr[NI_MAXHOST];
 180        if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
 181                        NI_NUMERICHOST) != 0)
 182                strcpy(addr, "(unknown)");
 183
 184        return addr;
 185}
 186
 187/*
 188 * Returns a connected socket() fd, or else die()s.
 189 */
 190static int git_tcp_connect_sock(char *host, int flags)
 191{
 192        struct strbuf error_message = STRBUF_INIT;
 193        int sockfd = -1;
 194        const char *port = STR(DEFAULT_GIT_PORT);
 195        struct addrinfo hints, *ai0, *ai;
 196        int gai;
 197        int cnt = 0;
 198
 199        get_host_and_port(&host, &port);
 200        if (!*port)
 201                port = "<none>";
 202
 203        memset(&hints, 0, sizeof(hints));
 204        hints.ai_socktype = SOCK_STREAM;
 205        hints.ai_protocol = IPPROTO_TCP;
 206
 207        if (flags & CONNECT_VERBOSE)
 208                fprintf(stderr, "Looking up %s ... ", host);
 209
 210        gai = getaddrinfo(host, port, &hints, &ai);
 211        if (gai)
 212                die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
 213
 214        if (flags & CONNECT_VERBOSE)
 215                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 216
 217        for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
 218                sockfd = socket(ai->ai_family,
 219                                ai->ai_socktype, ai->ai_protocol);
 220                if ((sockfd < 0) ||
 221                    (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
 222                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 223                                    host, cnt, ai_name(ai), strerror(errno));
 224                        if (0 <= sockfd)
 225                                close(sockfd);
 226                        sockfd = -1;
 227                        continue;
 228                }
 229                if (flags & CONNECT_VERBOSE)
 230                        fprintf(stderr, "%s ", ai_name(ai));
 231                break;
 232        }
 233
 234        freeaddrinfo(ai0);
 235
 236        if (sockfd < 0)
 237                die("unable to connect to %s:\n%s", host, error_message.buf);
 238
 239        if (flags & CONNECT_VERBOSE)
 240                fprintf(stderr, "done.\n");
 241
 242        strbuf_release(&error_message);
 243
 244        return sockfd;
 245}
 246
 247#else /* NO_IPV6 */
 248
 249/*
 250 * Returns a connected socket() fd, or else die()s.
 251 */
 252static int git_tcp_connect_sock(char *host, int flags)
 253{
 254        struct strbuf error_message = STRBUF_INIT;
 255        int sockfd = -1;
 256        const char *port = STR(DEFAULT_GIT_PORT);
 257        char *ep;
 258        struct hostent *he;
 259        struct sockaddr_in sa;
 260        char **ap;
 261        unsigned int nport;
 262        int cnt;
 263
 264        get_host_and_port(&host, &port);
 265
 266        if (flags & CONNECT_VERBOSE)
 267                fprintf(stderr, "Looking up %s ... ", host);
 268
 269        he = gethostbyname(host);
 270        if (!he)
 271                die("Unable to look up %s (%s)", host, hstrerror(h_errno));
 272        nport = strtoul(port, &ep, 10);
 273        if ( ep == port || *ep ) {
 274                /* Not numeric */
 275                struct servent *se = getservbyname(port,"tcp");
 276                if ( !se )
 277                        die("Unknown port %s", port);
 278                nport = se->s_port;
 279        }
 280
 281        if (flags & CONNECT_VERBOSE)
 282                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 283
 284        for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 285                memset(&sa, 0, sizeof sa);
 286                sa.sin_family = he->h_addrtype;
 287                sa.sin_port = htons(nport);
 288                memcpy(&sa.sin_addr, *ap, he->h_length);
 289
 290                sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 291                if ((sockfd < 0) ||
 292                    connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 293                        strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
 294                                host,
 295                                cnt,
 296                                inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 297                                strerror(errno));
 298                        if (0 <= sockfd)
 299                                close(sockfd);
 300                        sockfd = -1;
 301                        continue;
 302                }
 303                if (flags & CONNECT_VERBOSE)
 304                        fprintf(stderr, "%s ",
 305                                inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 306                break;
 307        }
 308
 309        if (sockfd < 0)
 310                die("unable to connect to %s:\n%s", host, error_message.buf);
 311
 312        if (flags & CONNECT_VERBOSE)
 313                fprintf(stderr, "done.\n");
 314
 315        return sockfd;
 316}
 317
 318#endif /* NO_IPV6 */
 319
 320
 321static void git_tcp_connect(int fd[2], char *host, int flags)
 322{
 323        int sockfd = git_tcp_connect_sock(host, flags);
 324
 325        fd[0] = sockfd;
 326        fd[1] = dup(sockfd);
 327}
 328
 329
 330static char *git_proxy_command;
 331
 332static int git_proxy_command_options(const char *var, const char *value,
 333                void *cb)
 334{
 335        if (!strcmp(var, "core.gitproxy")) {
 336                const char *for_pos;
 337                int matchlen = -1;
 338                int hostlen;
 339                const char *rhost_name = cb;
 340                int rhost_len = strlen(rhost_name);
 341
 342                if (git_proxy_command)
 343                        return 0;
 344                if (!value)
 345                        return config_error_nonbool(var);
 346                /* [core]
 347                 * ;# matches www.kernel.org as well
 348                 * gitproxy = netcatter-1 for kernel.org
 349                 * gitproxy = netcatter-2 for sample.xz
 350                 * gitproxy = netcatter-default
 351                 */
 352                for_pos = strstr(value, " for ");
 353                if (!for_pos)
 354                        /* matches everybody */
 355                        matchlen = strlen(value);
 356                else {
 357                        hostlen = strlen(for_pos + 5);
 358                        if (rhost_len < hostlen)
 359                                matchlen = -1;
 360                        else if (!strncmp(for_pos + 5,
 361                                          rhost_name + rhost_len - hostlen,
 362                                          hostlen) &&
 363                                 ((rhost_len == hostlen) ||
 364                                  rhost_name[rhost_len - hostlen -1] == '.'))
 365                                matchlen = for_pos - value;
 366                        else
 367                                matchlen = -1;
 368                }
 369                if (0 <= matchlen) {
 370                        /* core.gitproxy = none for kernel.org */
 371                        if (matchlen == 4 &&
 372                            !memcmp(value, "none", 4))
 373                                matchlen = 0;
 374                        git_proxy_command = xmemdupz(value, matchlen);
 375                }
 376                return 0;
 377        }
 378
 379        return git_default_config(var, value, cb);
 380}
 381
 382static int git_use_proxy(const char *host)
 383{
 384        git_proxy_command = getenv("GIT_PROXY_COMMAND");
 385        git_config(git_proxy_command_options, (void*)host);
 386        return (git_proxy_command && *git_proxy_command);
 387}
 388
 389static struct child_process *git_proxy_connect(int fd[2], char *host)
 390{
 391        const char *port = STR(DEFAULT_GIT_PORT);
 392        const char **argv;
 393        struct child_process *proxy;
 394
 395        get_host_and_port(&host, &port);
 396
 397        argv = xmalloc(sizeof(*argv) * 4);
 398        argv[0] = git_proxy_command;
 399        argv[1] = host;
 400        argv[2] = port;
 401        argv[3] = NULL;
 402        proxy = xcalloc(1, sizeof(*proxy));
 403        proxy->argv = argv;
 404        proxy->in = -1;
 405        proxy->out = -1;
 406        if (start_command(proxy))
 407                die("cannot start proxy %s", argv[0]);
 408        fd[0] = proxy->out; /* read from proxy stdout */
 409        fd[1] = proxy->in;  /* write to proxy stdin */
 410        return proxy;
 411}
 412
 413#define MAX_CMD_LEN 1024
 414
 415static char *get_port(char *host)
 416{
 417        char *end;
 418        char *p = strchr(host, ':');
 419
 420        if (p) {
 421                long port = strtol(p + 1, &end, 10);
 422                if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
 423                        *p = '\0';
 424                        return p+1;
 425                }
 426        }
 427
 428        return NULL;
 429}
 430
 431static struct child_process no_fork;
 432
 433/*
 434 * This returns a dummy child_process if the transport protocol does not
 435 * need fork(2), or a struct child_process object if it does.  Once done,
 436 * finish the connection with finish_connect() with the value returned from
 437 * this function (it is safe to call finish_connect() with NULL to support
 438 * the former case).
 439 *
 440 * If it returns, the connect is successful; it just dies on errors (this
 441 * will hopefully be changed in a libification effort, to return NULL when
 442 * the connection failed).
 443 */
 444struct child_process *git_connect(int fd[2], const char *url_orig,
 445                                  const char *prog, int flags)
 446{
 447        char *url;
 448        char *host, *path;
 449        char *end;
 450        int c;
 451        struct child_process *conn = &no_fork;
 452        enum protocol protocol = PROTO_LOCAL;
 453        int free_path = 0;
 454        char *port = NULL;
 455        const char **arg;
 456        struct strbuf cmd;
 457
 458        /* Without this we cannot rely on waitpid() to tell
 459         * what happened to our children.
 460         */
 461        signal(SIGCHLD, SIG_DFL);
 462
 463        if (is_url(url_orig))
 464                url = url_decode(url_orig);
 465        else
 466                url = xstrdup(url_orig);
 467
 468        host = strstr(url, "://");
 469        if (host) {
 470                *host = '\0';
 471                protocol = get_protocol(url);
 472                host += 3;
 473                c = '/';
 474        } else {
 475                host = url;
 476                c = ':';
 477        }
 478
 479        /*
 480         * Don't do destructive transforms with git:// as that
 481         * protocol code does '[]' unwrapping of its own.
 482         */
 483        if (host[0] == '[') {
 484                end = strchr(host + 1, ']');
 485                if (end) {
 486                        if (protocol != PROTO_GIT) {
 487                                *end = 0;
 488                                host++;
 489                        }
 490                        end++;
 491                } else
 492                        end = host;
 493        } else
 494                end = host;
 495
 496        path = strchr(end, c);
 497        if (path && !has_dos_drive_prefix(end)) {
 498                if (c == ':') {
 499                        protocol = PROTO_SSH;
 500                        *path++ = '\0';
 501                }
 502        } else
 503                path = end;
 504
 505        if (!path || !*path)
 506                die("No path specified. See 'man git-pull' for valid url syntax");
 507
 508        /*
 509         * null-terminate hostname and point path to ~ for URL's like this:
 510         *    ssh://host.xz/~user/repo
 511         */
 512        if (protocol != PROTO_LOCAL && host != url) {
 513                char *ptr = path;
 514                if (path[1] == '~')
 515                        path++;
 516                else {
 517                        path = xstrdup(ptr);
 518                        free_path = 1;
 519                }
 520
 521                *ptr = '\0';
 522        }
 523
 524        /*
 525         * Add support for ssh port: ssh://host.xy:<port>/...
 526         */
 527        if (protocol == PROTO_SSH && host != url)
 528                port = get_port(host);
 529
 530        if (protocol == PROTO_GIT) {
 531                /* These underlying connection commands die() if they
 532                 * cannot connect.
 533                 */
 534                char *target_host = xstrdup(host);
 535                if (git_use_proxy(host))
 536                        conn = git_proxy_connect(fd, host);
 537                else
 538                        git_tcp_connect(fd, host, flags);
 539                /*
 540                 * Separate original protocol components prog and path
 541                 * from extended host header with a NUL byte.
 542                 *
 543                 * Note: Do not add any other headers here!  Doing so
 544                 * will cause older git-daemon servers to crash.
 545                 */
 546                packet_write(fd[1],
 547                             "%s %s%chost=%s%c",
 548                             prog, path, 0,
 549                             target_host, 0);
 550                free(target_host);
 551                free(url);
 552                if (free_path)
 553                        free(path);
 554                return conn;
 555        }
 556
 557        conn = xcalloc(1, sizeof(*conn));
 558
 559        strbuf_init(&cmd, MAX_CMD_LEN);
 560        strbuf_addstr(&cmd, prog);
 561        strbuf_addch(&cmd, ' ');
 562        sq_quote_buf(&cmd, path);
 563        if (cmd.len >= MAX_CMD_LEN)
 564                die("command line too long");
 565
 566        conn->in = conn->out = -1;
 567        conn->argv = arg = xcalloc(7, sizeof(*arg));
 568        if (protocol == PROTO_SSH) {
 569                const char *ssh = getenv("GIT_SSH");
 570                int putty = ssh && strcasestr(ssh, "plink");
 571                if (!ssh) ssh = "ssh";
 572
 573                *arg++ = ssh;
 574                if (putty && !strcasestr(ssh, "tortoiseplink"))
 575                        *arg++ = "-batch";
 576                if (port) {
 577                        /* P is for PuTTY, p is for OpenSSH */
 578                        *arg++ = putty ? "-P" : "-p";
 579                        *arg++ = port;
 580                }
 581                *arg++ = host;
 582        }
 583        else {
 584                /* remove repo-local variables from the environment */
 585                conn->env = local_repo_env;
 586                conn->use_shell = 1;
 587        }
 588        *arg++ = cmd.buf;
 589        *arg = NULL;
 590
 591        if (start_command(conn))
 592                die("unable to fork");
 593
 594        fd[0] = conn->out; /* read from child's stdout */
 595        fd[1] = conn->in;  /* write to child's stdin */
 596        strbuf_release(&cmd);
 597        free(url);
 598        if (free_path)
 599                free(path);
 600        return conn;
 601}
 602
 603int git_connection_is_socket(struct child_process *conn)
 604{
 605        return conn == &no_fork;
 606}
 607
 608int finish_connect(struct child_process *conn)
 609{
 610        int code;
 611        if (!conn || git_connection_is_socket(conn))
 612                return 0;
 613
 614        code = finish_command(conn);
 615        free(conn->argv);
 616        free(conn);
 617        return code;
 618}
 619
 620char *git_getpass(const char *prompt)
 621{
 622        const char *askpass;
 623        struct child_process pass;
 624        const char *args[3];
 625        static struct strbuf buffer = STRBUF_INIT;
 626
 627        askpass = getenv("GIT_ASKPASS");
 628        if (!askpass)
 629                askpass = askpass_program;
 630        if (!askpass)
 631                askpass = getenv("SSH_ASKPASS");
 632        if (!askpass || !(*askpass)) {
 633                char *result = getpass(prompt);
 634                if (!result)
 635                        die_errno("Could not read password");
 636                return result;
 637        }
 638
 639        args[0] = askpass;
 640        args[1] = prompt;
 641        args[2] = NULL;
 642
 643        memset(&pass, 0, sizeof(pass));
 644        pass.argv = args;
 645        pass.out = -1;
 646
 647        if (start_command(&pass))
 648                exit(1);
 649
 650        strbuf_reset(&buffer);
 651        if (strbuf_read(&buffer, pass.out, 20) < 0)
 652                die("failed to read password from %s\n", askpass);
 653
 654        close(pass.out);
 655
 656        if (finish_command(&pass))
 657                exit(1);
 658
 659        strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
 660
 661        return buffer.buf;
 662}