Andrew's git / gitweb.git / connect.c
?
connect.con commit Merge branch 'pb/gitweb' (01ed107)
   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
   9static char *server_capabilities;
  10
  11static int check_ref(const char *name, int len, unsigned int flags)
  12{
  13        if (!flags)
  14                return 1;
  15
  16        if (len < 5 || memcmp(name, "refs/", 5))
  17                return 0;
  18
  19        /* Skip the "refs/" part */
  20        name += 5;
  21        len -= 5;
  22
  23        /* REF_NORMAL means that we don't want the magic fake tag refs */
  24        if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
  25                return 0;
  26
  27        /* REF_HEADS means that we want regular branch heads */
  28        if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
  29                return 1;
  30
  31        /* REF_TAGS means that we want tags */
  32        if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
  33                return 1;
  34
  35        /* All type bits clear means that we are ok with anything */
  36        return !(flags & ~REF_NORMAL);
  37}
  38
  39int check_ref_type(const struct ref *ref, int flags)
  40{
  41        return check_ref(ref->name, strlen(ref->name), flags);
  42}
  43
  44static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
  45{
  46        ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
  47        hashcpy(&(extra->array[extra->nr][0]), sha1);
  48        extra->nr++;
  49}
  50
  51/*
  52 * Read all the refs from the other end
  53 */
  54struct ref **get_remote_heads(int in, struct ref **list,
  55                              int nr_match, char **match,
  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 < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
  74                        die("protocol error: expected sha/ref, got '%s'", buffer);
  75                name = buffer + 41;
  76
  77                name_len = strlen(name);
  78                if (len != name_len + 41) {
  79                        free(server_capabilities);
  80                        server_capabilities = xstrdup(name + name_len + 1);
  81                }
  82
  83                if (extra_have &&
  84                    name_len == 5 && !memcmp(".have", name, 5)) {
  85                        add_extra_have(extra_have, old_sha1);
  86                        continue;
  87                }
  88
  89                if (!check_ref(name, name_len, flags))
  90                        continue;
  91                if (nr_match && !path_match(name, nr_match, match))
  92                        continue;
  93                ref = alloc_ref(name_len + 1);
  94                hashcpy(ref->old_sha1, old_sha1);
  95                memcpy(ref->name, buffer + 41, name_len + 1);
  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 get_ack(int fd, unsigned char *result_sha1)
 109{
 110        static char line[1000];
 111        int len = packet_read_line(fd, line, sizeof(line));
 112
 113        if (!len)
 114                die("git fetch-pack: expected ACK/NAK, got EOF");
 115        if (line[len-1] == '\n')
 116                line[--len] = 0;
 117        if (!strcmp(line, "NAK"))
 118                return 0;
 119        if (!prefixcmp(line, "ACK ")) {
 120                if (!get_sha1_hex(line+4, result_sha1)) {
 121                        if (strstr(line+45, "continue"))
 122                                return 2;
 123                        return 1;
 124                }
 125        }
 126        die("git fetch_pack: expected ACK/NAK, got '%s'", line);
 127}
 128
 129int path_match(const char *path, int nr, char **match)
 130{
 131        int i;
 132        int pathlen = strlen(path);
 133
 134        for (i = 0; i < nr; i++) {
 135                char *s = match[i];
 136                int len = strlen(s);
 137
 138                if (!len || len > pathlen)
 139                        continue;
 140                if (memcmp(path + pathlen - len, s, len))
 141                        continue;
 142                if (pathlen > len && path[pathlen - len - 1] != '/')
 143                        continue;
 144                *s = 0;
 145                return (i + 1);
 146        }
 147        return 0;
 148}
 149
 150enum protocol {
 151        PROTO_LOCAL = 1,
 152        PROTO_SSH,
 153        PROTO_GIT,
 154};
 155
 156static enum protocol get_protocol(const char *name)
 157{
 158        if (!strcmp(name, "ssh"))
 159                return PROTO_SSH;
 160        if (!strcmp(name, "git"))
 161                return PROTO_GIT;
 162        if (!strcmp(name, "git+ssh"))
 163                return PROTO_SSH;
 164        if (!strcmp(name, "ssh+git"))
 165                return PROTO_SSH;
 166        if (!strcmp(name, "file"))
 167                return PROTO_LOCAL;
 168        die("I don't handle protocol '%s'", name);
 169}
 170
 171#define STR_(s) # s
 172#define STR(s)  STR_(s)
 173
 174#ifndef NO_IPV6
 175
 176static const char *ai_name(const struct addrinfo *ai)
 177{
 178        static char addr[INET_ADDRSTRLEN];
 179        if ( AF_INET == ai->ai_family ) {
 180                struct sockaddr_in *in;
 181                in = (struct sockaddr_in *)ai->ai_addr;
 182                inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
 183        } else if ( AF_INET6 == ai->ai_family ) {
 184                struct sockaddr_in6 *in;
 185                in = (struct sockaddr_in6 *)ai->ai_addr;
 186                inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
 187        } else {
 188                strcpy(addr, "(unknown)");
 189        }
 190        return addr;
 191}
 192
 193/*
 194 * Returns a connected socket() fd, or else die()s.
 195 */
 196static int git_tcp_connect_sock(char *host, int flags)
 197{
 198        int sockfd = -1, saved_errno = 0;
 199        char *colon, *end;
 200        const char *port = STR(DEFAULT_GIT_PORT);
 201        struct addrinfo hints, *ai0, *ai;
 202        int gai;
 203        int cnt = 0;
 204
 205        if (host[0] == '[') {
 206                end = strchr(host + 1, ']');
 207                if (end) {
 208                        *end = 0;
 209                        end++;
 210                        host++;
 211                } else
 212                        end = host;
 213        } else
 214                end = host;
 215        colon = strchr(end, ':');
 216
 217        if (colon) {
 218                *colon = 0;
 219                port = colon + 1;
 220                if (!*port)
 221                        port = "<none>";
 222        }
 223
 224        memset(&hints, 0, sizeof(hints));
 225        hints.ai_socktype = SOCK_STREAM;
 226        hints.ai_protocol = IPPROTO_TCP;
 227
 228        if (flags & CONNECT_VERBOSE)
 229                fprintf(stderr, "Looking up %s ... ", host);
 230
 231        gai = getaddrinfo(host, port, &hints, &ai);
 232        if (gai)
 233                die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
 234
 235        if (flags & CONNECT_VERBOSE)
 236                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 237
 238        for (ai0 = ai; ai; ai = ai->ai_next) {
 239                sockfd = socket(ai->ai_family,
 240                                ai->ai_socktype, ai->ai_protocol);
 241                if (sockfd < 0) {
 242                        saved_errno = errno;
 243                        continue;
 244                }
 245                if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
 246                        saved_errno = errno;
 247                        fprintf(stderr, "%s[%d: %s]: errno=%s\n",
 248                                host,
 249                                cnt,
 250                                ai_name(ai),
 251                                strerror(saved_errno));
 252                        close(sockfd);
 253                        sockfd = -1;
 254                        continue;
 255                }
 256                if (flags & CONNECT_VERBOSE)
 257                        fprintf(stderr, "%s ", ai_name(ai));
 258                break;
 259        }
 260
 261        freeaddrinfo(ai0);
 262
 263        if (sockfd < 0)
 264                die("unable to connect a socket (%s)", strerror(saved_errno));
 265
 266        if (flags & CONNECT_VERBOSE)
 267                fprintf(stderr, "done.\n");
 268
 269        return sockfd;
 270}
 271
 272#else /* NO_IPV6 */
 273
 274/*
 275 * Returns a connected socket() fd, or else die()s.
 276 */
 277static int git_tcp_connect_sock(char *host, int flags)
 278{
 279        int sockfd = -1, saved_errno = 0;
 280        char *colon, *end;
 281        char *port = STR(DEFAULT_GIT_PORT), *ep;
 282        struct hostent *he;
 283        struct sockaddr_in sa;
 284        char **ap;
 285        unsigned int nport;
 286        int cnt;
 287
 288        if (host[0] == '[') {
 289                end = strchr(host + 1, ']');
 290                if (end) {
 291                        *end = 0;
 292                        end++;
 293                        host++;
 294                } else
 295                        end = host;
 296        } else
 297                end = host;
 298        colon = strchr(end, ':');
 299
 300        if (colon) {
 301                *colon = 0;
 302                port = colon + 1;
 303        }
 304
 305        if (flags & CONNECT_VERBOSE)
 306                fprintf(stderr, "Looking up %s ... ", host);
 307
 308        he = gethostbyname(host);
 309        if (!he)
 310                die("Unable to look up %s (%s)", host, hstrerror(h_errno));
 311        nport = strtoul(port, &ep, 10);
 312        if ( ep == port || *ep ) {
 313                /* Not numeric */
 314                struct servent *se = getservbyname(port,"tcp");
 315                if ( !se )
 316                        die("Unknown port %s\n", port);
 317                nport = se->s_port;
 318        }
 319
 320        if (flags & CONNECT_VERBOSE)
 321                fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
 322
 323        for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
 324                sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
 325                if (sockfd < 0) {
 326                        saved_errno = errno;
 327                        continue;
 328                }
 329
 330                memset(&sa, 0, sizeof sa);
 331                sa.sin_family = he->h_addrtype;
 332                sa.sin_port = htons(nport);
 333                memcpy(&sa.sin_addr, *ap, he->h_length);
 334
 335                if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 336                        saved_errno = errno;
 337                        fprintf(stderr, "%s[%d: %s]: errno=%s\n",
 338                                host,
 339                                cnt,
 340                                inet_ntoa(*(struct in_addr *)&sa.sin_addr),
 341                                strerror(saved_errno));
 342                        close(sockfd);
 343                        sockfd = -1;
 344                        continue;
 345                }
 346                if (flags & CONNECT_VERBOSE)
 347                        fprintf(stderr, "%s ",
 348                                inet_ntoa(*(struct in_addr *)&sa.sin_addr));
 349                break;
 350        }
 351
 352        if (sockfd < 0)
 353                die("unable to connect a socket (%s)", strerror(saved_errno));
 354
 355        if (flags & CONNECT_VERBOSE)
 356                fprintf(stderr, "done.\n");
 357
 358        return sockfd;
 359}
 360
 361#endif /* NO_IPV6 */
 362
 363
 364static void git_tcp_connect(int fd[2], char *host, int flags)
 365{
 366        int sockfd = git_tcp_connect_sock(host, flags);
 367
 368        fd[0] = sockfd;
 369        fd[1] = dup(sockfd);
 370}
 371
 372
 373static char *git_proxy_command;
 374static const char *rhost_name;
 375static int rhost_len;
 376
 377static int git_proxy_command_options(const char *var, const char *value,
 378                void *cb)
 379{
 380        if (!strcmp(var, "core.gitproxy")) {
 381                const char *for_pos;
 382                int matchlen = -1;
 383                int hostlen;
 384
 385                if (git_proxy_command)
 386                        return 0;
 387                if (!value)
 388                        return config_error_nonbool(var);
 389                /* [core]
 390                 * ;# matches www.kernel.org as well
 391                 * gitproxy = netcatter-1 for kernel.org
 392                 * gitproxy = netcatter-2 for sample.xz
 393                 * gitproxy = netcatter-default
 394                 */
 395                for_pos = strstr(value, " for ");
 396                if (!for_pos)
 397                        /* matches everybody */
 398                        matchlen = strlen(value);
 399                else {
 400                        hostlen = strlen(for_pos + 5);
 401                        if (rhost_len < hostlen)
 402                                matchlen = -1;
 403                        else if (!strncmp(for_pos + 5,
 404                                          rhost_name + rhost_len - hostlen,
 405                                          hostlen) &&
 406                                 ((rhost_len == hostlen) ||
 407                                  rhost_name[rhost_len - hostlen -1] == '.'))
 408                                matchlen = for_pos - value;
 409                        else
 410                                matchlen = -1;
 411                }
 412                if (0 <= matchlen) {
 413                        /* core.gitproxy = none for kernel.org */
 414                        if (matchlen == 4 &&
 415                            !memcmp(value, "none", 4))
 416                                matchlen = 0;
 417                        git_proxy_command = xmemdupz(value, matchlen);
 418                }
 419                return 0;
 420        }
 421
 422        return git_default_config(var, value, cb);
 423}
 424
 425static int git_use_proxy(const char *host)
 426{
 427        rhost_name = host;
 428        rhost_len = strlen(host);
 429        git_proxy_command = getenv("GIT_PROXY_COMMAND");
 430        git_config(git_proxy_command_options, NULL);
 431        rhost_name = NULL;
 432        return (git_proxy_command && *git_proxy_command);
 433}
 434
 435static void git_proxy_connect(int fd[2], char *host)
 436{
 437        const char *port = STR(DEFAULT_GIT_PORT);
 438        char *colon, *end;
 439        const char *argv[4];
 440        struct child_process proxy;
 441
 442        if (host[0] == '[') {
 443                end = strchr(host + 1, ']');
 444                if (end) {
 445                        *end = 0;
 446                        end++;
 447                        host++;
 448                } else
 449                        end = host;
 450        } else
 451                end = host;
 452        colon = strchr(end, ':');
 453
 454        if (colon) {
 455                *colon = 0;
 456                port = colon + 1;
 457        }
 458
 459        argv[0] = git_proxy_command;
 460        argv[1] = host;
 461        argv[2] = port;
 462        argv[3] = NULL;
 463        memset(&proxy, 0, sizeof(proxy));
 464        proxy.argv = argv;
 465        proxy.in = -1;
 466        proxy.out = -1;
 467        if (start_command(&proxy))
 468                die("cannot start proxy %s", argv[0]);
 469        fd[0] = proxy.out; /* read from proxy stdout */
 470        fd[1] = proxy.in;  /* write to proxy stdin */
 471}
 472
 473#define MAX_CMD_LEN 1024
 474
 475char *get_port(char *host)
 476{
 477        char *end;
 478        char *p = strchr(host, ':');
 479
 480        if (p) {
 481                strtol(p+1, &end, 10);
 482                if (*end == '\0') {
 483                        *p = '\0';
 484                        return p+1;
 485                }
 486        }
 487
 488        return NULL;
 489}
 490
 491static struct child_process no_fork;
 492
 493/*
 494 * This returns a dummy child_process if the transport protocol does not
 495 * need fork(2), or a struct child_process object if it does.  Once done,
 496 * finish the connection with finish_connect() with the value returned from
 497 * this function (it is safe to call finish_connect() with NULL to support
 498 * the former case).
 499 *
 500 * If it returns, the connect is successful; it just dies on errors (this
 501 * will hopefully be changed in a libification effort, to return NULL when
 502 * the connection failed).
 503 */
 504struct child_process *git_connect(int fd[2], const char *url_orig,
 505                                  const char *prog, int flags)
 506{
 507        char *url = xstrdup(url_orig);
 508        char *host, *path = url;
 509        char *end;
 510        int c;
 511        struct child_process *conn;
 512        enum protocol protocol = PROTO_LOCAL;
 513        int free_path = 0;
 514        char *port = NULL;
 515        const char **arg;
 516        struct strbuf cmd;
 517
 518        /* Without this we cannot rely on waitpid() to tell
 519         * what happened to our children.
 520         */
 521        signal(SIGCHLD, SIG_DFL);
 522
 523        host = strstr(url, "://");
 524        if(host) {
 525                *host = '\0';
 526                protocol = get_protocol(url);
 527                host += 3;
 528                c = '/';
 529        } else {
 530                host = url;
 531                c = ':';
 532        }
 533
 534        if (host[0] == '[') {
 535                end = strchr(host + 1, ']');
 536                if (end) {
 537                        *end = 0;
 538                        end++;
 539                        host++;
 540                } else
 541                        end = host;
 542        } else
 543                end = host;
 544
 545        path = strchr(end, c);
 546        if (path && !has_dos_drive_prefix(end)) {
 547                if (c == ':') {
 548                        protocol = PROTO_SSH;
 549                        *path++ = '\0';
 550                }
 551        } else
 552                path = end;
 553
 554        if (!path || !*path)
 555                die("No path specified. See 'man git-pull' for valid url syntax");
 556
 557        /*
 558         * null-terminate hostname and point path to ~ for URL's like this:
 559         *    ssh://host.xz/~user/repo
 560         */
 561        if (protocol != PROTO_LOCAL && host != url) {
 562                char *ptr = path;
 563                if (path[1] == '~')
 564                        path++;
 565                else {
 566                        path = xstrdup(ptr);
 567                        free_path = 1;
 568                }
 569
 570                *ptr = '\0';
 571        }
 572
 573        /*
 574         * Add support for ssh port: ssh://host.xy:<port>/...
 575         */
 576        if (protocol == PROTO_SSH && host != url)
 577                port = get_port(host);
 578
 579        if (protocol == PROTO_GIT) {
 580                /* These underlying connection commands die() if they
 581                 * cannot connect.
 582                 */
 583                char *target_host = xstrdup(host);
 584                if (git_use_proxy(host))
 585                        git_proxy_connect(fd, host);
 586                else
 587                        git_tcp_connect(fd, host, flags);
 588                /*
 589                 * Separate original protocol components prog and path
 590                 * from extended components with a NUL byte.
 591                 */
 592                packet_write(fd[1],
 593                             "%s %s%chost=%s%c",
 594                             prog, path, 0,
 595                             target_host, 0);
 596                free(target_host);
 597                free(url);
 598                if (free_path)
 599                        free(path);
 600                return &no_fork;
 601        }
 602
 603        conn = xcalloc(1, sizeof(*conn));
 604
 605        strbuf_init(&cmd, MAX_CMD_LEN);
 606        strbuf_addstr(&cmd, prog);
 607        strbuf_addch(&cmd, ' ');
 608        sq_quote_buf(&cmd, path);
 609        if (cmd.len >= MAX_CMD_LEN)
 610                die("command line too long");
 611
 612        conn->in = conn->out = -1;
 613        conn->argv = arg = xcalloc(6, sizeof(*arg));
 614        if (protocol == PROTO_SSH) {
 615                const char *ssh = getenv("GIT_SSH");
 616                if (!ssh) ssh = "ssh";
 617
 618                *arg++ = ssh;
 619                if (port) {
 620                        *arg++ = "-p";
 621                        *arg++ = port;
 622                }
 623                *arg++ = host;
 624        }
 625        else {
 626                /* remove these from the environment */
 627                const char *env[] = {
 628                        ALTERNATE_DB_ENVIRONMENT,
 629                        DB_ENVIRONMENT,
 630                        GIT_DIR_ENVIRONMENT,
 631                        GIT_WORK_TREE_ENVIRONMENT,
 632                        GRAFT_ENVIRONMENT,
 633                        INDEX_ENVIRONMENT,
 634                        NULL
 635                };
 636                conn->env = env;
 637                *arg++ = "sh";
 638                *arg++ = "-c";
 639        }
 640        *arg++ = cmd.buf;
 641        *arg = NULL;
 642
 643        if (start_command(conn))
 644                die("unable to fork");
 645
 646        fd[0] = conn->out; /* read from child's stdout */
 647        fd[1] = conn->in;  /* write to child's stdin */
 648        strbuf_release(&cmd);
 649        free(url);
 650        if (free_path)
 651                free(path);
 652        return conn;
 653}
 654
 655int finish_connect(struct child_process *conn)
 656{
 657        int code;
 658        if (!conn || conn == &no_fork)
 659                return 0;
 660
 661        code = finish_command(conn);
 662        free(conn->argv);
 663        free(conn);
 664        return code;
 665}