Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "config.h"
   3#include "refs.h"
   4#include "pkt-line.h"
   5#include "object.h"
   6#include "tag.h"
   7#include "exec_cmd.h"
   8#include "run-command.h"
   9#include "string-list.h"
  10#include "url.h"
  11#include "argv-array.h"
  12#include "packfile.h"
  13#include "protocol.h"
  14
  15static const char content_type[] = "Content-Type";
  16static const char content_length[] = "Content-Length";
  17static const char last_modified[] = "Last-Modified";
  18static int getanyfile = 1;
  19static unsigned long max_request_buffer = 10 * 1024 * 1024;
  20
  21static struct string_list *query_params;
  22
  23struct rpc_service {
  24        const char *name;
  25        const char *config_name;
  26        unsigned buffer_input : 1;
  27        signed enabled : 2;
  28};
  29
  30static struct rpc_service rpc_service[] = {
  31        { "upload-pack", "uploadpack", 1, 1 },
  32        { "receive-pack", "receivepack", 0, -1 },
  33};
  34
  35static struct string_list *get_parameters(void)
  36{
  37        if (!query_params) {
  38                const char *query = getenv("QUERY_STRING");
  39
  40                query_params = xcalloc(1, sizeof(*query_params));
  41                while (query && *query) {
  42                        char *name = url_decode_parameter_name(&query);
  43                        char *value = url_decode_parameter_value(&query);
  44                        struct string_list_item *i;
  45
  46                        i = string_list_lookup(query_params, name);
  47                        if (!i)
  48                                i = string_list_insert(query_params, name);
  49                        else
  50                                free(i->util);
  51                        i->util = value;
  52                }
  53        }
  54        return query_params;
  55}
  56
  57static const char *get_parameter(const char *name)
  58{
  59        struct string_list_item *i;
  60        i = string_list_lookup(get_parameters(), name);
  61        return i ? i->util : NULL;
  62}
  63
  64__attribute__((format (printf, 2, 3)))
  65static void format_write(int fd, const char *fmt, ...)
  66{
  67        static char buffer[1024];
  68
  69        va_list args;
  70        unsigned n;
  71
  72        va_start(args, fmt);
  73        n = vsnprintf(buffer, sizeof(buffer), fmt, args);
  74        va_end(args);
  75        if (n >= sizeof(buffer))
  76                die("protocol error: impossibly long line");
  77
  78        write_or_die(fd, buffer, n);
  79}
  80
  81static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
  82{
  83        strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
  84}
  85
  86static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
  87{
  88        strbuf_addf(hdr, "%s: %s\r\n", name, value);
  89}
  90
  91static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
  92{
  93        strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
  94}
  95
  96static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
  97{
  98        const char *value = show_date(when, 0, DATE_MODE(RFC2822));
  99        hdr_str(hdr, name, value);
 100}
 101
 102static void hdr_nocache(struct strbuf *hdr)
 103{
 104        hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
 105        hdr_str(hdr, "Pragma", "no-cache");
 106        hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
 107}
 108
 109static void hdr_cache_forever(struct strbuf *hdr)
 110{
 111        timestamp_t now = time(NULL);
 112        hdr_date(hdr, "Date", now);
 113        hdr_date(hdr, "Expires", now + 31536000);
 114        hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
 115}
 116
 117static void end_headers(struct strbuf *hdr)
 118{
 119        strbuf_add(hdr, "\r\n", 2);
 120        write_or_die(1, hdr->buf, hdr->len);
 121        strbuf_release(hdr);
 122}
 123
 124__attribute__((format (printf, 2, 3)))
 125static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
 126{
 127        va_list params;
 128
 129        http_status(hdr, 404, "Not Found");
 130        hdr_nocache(hdr);
 131        end_headers(hdr);
 132
 133        va_start(params, err);
 134        if (err && *err)
 135                vfprintf(stderr, err, params);
 136        va_end(params);
 137        exit(0);
 138}
 139
 140__attribute__((format (printf, 2, 3)))
 141static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
 142{
 143        va_list params;
 144
 145        http_status(hdr, 403, "Forbidden");
 146        hdr_nocache(hdr);
 147        end_headers(hdr);
 148
 149        va_start(params, err);
 150        if (err && *err)
 151                vfprintf(stderr, err, params);
 152        va_end(params);
 153        exit(0);
 154}
 155
 156static void select_getanyfile(struct strbuf *hdr)
 157{
 158        if (!getanyfile)
 159                forbidden(hdr, "Unsupported service: getanyfile");
 160}
 161
 162static void send_strbuf(struct strbuf *hdr,
 163                        const char *type, struct strbuf *buf)
 164{
 165        hdr_int(hdr, content_length, buf->len);
 166        hdr_str(hdr, content_type, type);
 167        end_headers(hdr);
 168        write_or_die(1, buf->buf, buf->len);
 169}
 170
 171static void send_local_file(struct strbuf *hdr, const char *the_type,
 172                                const char *name)
 173{
 174        char *p = git_pathdup("%s", name);
 175        size_t buf_alloc = 8192;
 176        char *buf = xmalloc(buf_alloc);
 177        int fd;
 178        struct stat sb;
 179
 180        fd = open(p, O_RDONLY);
 181        if (fd < 0)
 182                not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
 183        if (fstat(fd, &sb) < 0)
 184                die_errno("Cannot stat '%s'", p);
 185
 186        hdr_int(hdr, content_length, sb.st_size);
 187        hdr_str(hdr, content_type, the_type);
 188        hdr_date(hdr, last_modified, sb.st_mtime);
 189        end_headers(hdr);
 190
 191        for (;;) {
 192                ssize_t n = xread(fd, buf, buf_alloc);
 193                if (n < 0)
 194                        die_errno("Cannot read '%s'", p);
 195                if (!n)
 196                        break;
 197                write_or_die(1, buf, n);
 198        }
 199        close(fd);
 200        free(buf);
 201        free(p);
 202}
 203
 204static void get_text_file(struct strbuf *hdr, char *name)
 205{
 206        select_getanyfile(hdr);
 207        hdr_nocache(hdr);
 208        send_local_file(hdr, "text/plain", name);
 209}
 210
 211static void get_loose_object(struct strbuf *hdr, char *name)
 212{
 213        select_getanyfile(hdr);
 214        hdr_cache_forever(hdr);
 215        send_local_file(hdr, "application/x-git-loose-object", name);
 216}
 217
 218static void get_pack_file(struct strbuf *hdr, char *name)
 219{
 220        select_getanyfile(hdr);
 221        hdr_cache_forever(hdr);
 222        send_local_file(hdr, "application/x-git-packed-objects", name);
 223}
 224
 225static void get_idx_file(struct strbuf *hdr, char *name)
 226{
 227        select_getanyfile(hdr);
 228        hdr_cache_forever(hdr);
 229        send_local_file(hdr, "application/x-git-packed-objects-toc", name);
 230}
 231
 232static void http_config(void)
 233{
 234        int i, value = 0;
 235        struct strbuf var = STRBUF_INIT;
 236
 237        git_config_get_bool("http.getanyfile", &getanyfile);
 238        git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
 239
 240        for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 241                struct rpc_service *svc = &rpc_service[i];
 242                strbuf_addf(&var, "http.%s", svc->config_name);
 243                if (!git_config_get_bool(var.buf, &value))
 244                        svc->enabled = value;
 245                strbuf_reset(&var);
 246        }
 247
 248        strbuf_release(&var);
 249}
 250
 251static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
 252{
 253        const char *svc_name;
 254        struct rpc_service *svc = NULL;
 255        int i;
 256
 257        if (!skip_prefix(name, "git-", &svc_name))
 258                forbidden(hdr, "Unsupported service: '%s'", name);
 259
 260        for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 261                struct rpc_service *s = &rpc_service[i];
 262                if (!strcmp(s->name, svc_name)) {
 263                        svc = s;
 264                        break;
 265                }
 266        }
 267
 268        if (!svc)
 269                forbidden(hdr, "Unsupported service: '%s'", name);
 270
 271        if (svc->enabled < 0) {
 272                const char *user = getenv("REMOTE_USER");
 273                svc->enabled = (user && *user) ? 1 : 0;
 274        }
 275        if (!svc->enabled)
 276                forbidden(hdr, "Service not enabled: '%s'", svc->name);
 277        return svc;
 278}
 279
 280/*
 281 * This is basically strbuf_read(), except that if we
 282 * hit max_request_buffer we die (we'd rather reject a
 283 * maliciously large request than chew up infinite memory).
 284 */
 285static ssize_t read_request(int fd, unsigned char **out)
 286{
 287        size_t len = 0, alloc = 8192;
 288        unsigned char *buf = xmalloc(alloc);
 289
 290        if (max_request_buffer < alloc)
 291                max_request_buffer = alloc;
 292
 293        while (1) {
 294                ssize_t cnt;
 295
 296                cnt = read_in_full(fd, buf + len, alloc - len);
 297                if (cnt < 0) {
 298                        free(buf);
 299                        return -1;
 300                }
 301
 302                /* partial read from read_in_full means we hit EOF */
 303                len += cnt;
 304                if (len < alloc) {
 305                        *out = buf;
 306                        return len;
 307                }
 308
 309                /* otherwise, grow and try again (if we can) */
 310                if (alloc == max_request_buffer)
 311                        die("request was larger than our maximum size (%lu);"
 312                            " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 313                            max_request_buffer);
 314
 315                alloc = alloc_nr(alloc);
 316                if (alloc > max_request_buffer)
 317                        alloc = max_request_buffer;
 318                REALLOC_ARRAY(buf, alloc);
 319        }
 320}
 321
 322static void inflate_request(const char *prog_name, int out, int buffer_input)
 323{
 324        git_zstream stream;
 325        unsigned char *full_request = NULL;
 326        unsigned char in_buf[8192];
 327        unsigned char out_buf[8192];
 328        unsigned long cnt = 0;
 329
 330        memset(&stream, 0, sizeof(stream));
 331        git_inflate_init_gzip_only(&stream);
 332
 333        while (1) {
 334                ssize_t n;
 335
 336                if (buffer_input) {
 337                        if (full_request)
 338                                n = 0; /* nothing left to read */
 339                        else
 340                                n = read_request(0, &full_request);
 341                        stream.next_in = full_request;
 342                } else {
 343                        n = xread(0, in_buf, sizeof(in_buf));
 344                        stream.next_in = in_buf;
 345                }
 346
 347                if (n <= 0)
 348                        die("request ended in the middle of the gzip stream");
 349                stream.avail_in = n;
 350
 351                while (0 < stream.avail_in) {
 352                        int ret;
 353
 354                        stream.next_out = out_buf;
 355                        stream.avail_out = sizeof(out_buf);
 356
 357                        ret = git_inflate(&stream, Z_NO_FLUSH);
 358                        if (ret != Z_OK && ret != Z_STREAM_END)
 359                                die("zlib error inflating request, result %d", ret);
 360
 361                        n = stream.total_out - cnt;
 362                        if (write_in_full(out, out_buf, n) < 0)
 363                                die("%s aborted reading request", prog_name);
 364                        cnt += n;
 365
 366                        if (ret == Z_STREAM_END)
 367                                goto done;
 368                }
 369        }
 370
 371done:
 372        git_inflate_end(&stream);
 373        close(out);
 374        free(full_request);
 375}
 376
 377static void copy_request(const char *prog_name, int out)
 378{
 379        unsigned char *buf;
 380        ssize_t n = read_request(0, &buf);
 381        if (n < 0)
 382                die_errno("error reading request body");
 383        if (write_in_full(out, buf, n) < 0)
 384                die("%s aborted reading request", prog_name);
 385        close(out);
 386        free(buf);
 387}
 388
 389static void run_service(const char **argv, int buffer_input)
 390{
 391        const char *encoding = getenv("HTTP_CONTENT_ENCODING");
 392        const char *user = getenv("REMOTE_USER");
 393        const char *host = getenv("REMOTE_ADDR");
 394        int gzipped_request = 0;
 395        struct child_process cld = CHILD_PROCESS_INIT;
 396
 397        if (encoding && !strcmp(encoding, "gzip"))
 398                gzipped_request = 1;
 399        else if (encoding && !strcmp(encoding, "x-gzip"))
 400                gzipped_request = 1;
 401
 402        if (!user || !*user)
 403                user = "anonymous";
 404        if (!host || !*host)
 405                host = "(none)";
 406
 407        if (!getenv("GIT_COMMITTER_NAME"))
 408                argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
 409        if (!getenv("GIT_COMMITTER_EMAIL"))
 410                argv_array_pushf(&cld.env_array,
 411                                 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
 412
 413        cld.argv = argv;
 414        if (buffer_input || gzipped_request)
 415                cld.in = -1;
 416        cld.git_cmd = 1;
 417        if (start_command(&cld))
 418                exit(1);
 419
 420        close(1);
 421        if (gzipped_request)
 422                inflate_request(argv[0], cld.in, buffer_input);
 423        else if (buffer_input)
 424                copy_request(argv[0], cld.in);
 425        else
 426                close(0);
 427
 428        if (finish_command(&cld))
 429                exit(1);
 430}
 431
 432static int show_text_ref(const char *name, const struct object_id *oid,
 433                         int flag, void *cb_data)
 434{
 435        const char *name_nons = strip_namespace(name);
 436        struct strbuf *buf = cb_data;
 437        struct object *o = parse_object(oid);
 438        if (!o)
 439                return 0;
 440
 441        strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
 442        if (o->type == OBJ_TAG) {
 443                o = deref_tag(o, name, 0);
 444                if (!o)
 445                        return 0;
 446                strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
 447                            name_nons);
 448        }
 449        return 0;
 450}
 451
 452static void get_info_refs(struct strbuf *hdr, char *arg)
 453{
 454        const char *service_name = get_parameter("service");
 455        struct strbuf buf = STRBUF_INIT;
 456
 457        hdr_nocache(hdr);
 458
 459        if (service_name) {
 460                const char *argv[] = {NULL /* service name */,
 461                        "--stateless-rpc", "--advertise-refs",
 462                        ".", NULL};
 463                struct rpc_service *svc = select_service(hdr, service_name);
 464
 465                strbuf_addf(&buf, "application/x-git-%s-advertisement",
 466                        svc->name);
 467                hdr_str(hdr, content_type, buf.buf);
 468                end_headers(hdr);
 469
 470
 471                if (determine_protocol_version_server() != protocol_v2) {
 472                        packet_write_fmt(1, "# service=git-%s\n", svc->name);
 473                        packet_flush(1);
 474                }
 475
 476                argv[0] = svc->name;
 477                run_service(argv, 0);
 478
 479        } else {
 480                select_getanyfile(hdr);
 481                for_each_namespaced_ref(show_text_ref, &buf);
 482                send_strbuf(hdr, "text/plain", &buf);
 483        }
 484        strbuf_release(&buf);
 485}
 486
 487static int show_head_ref(const char *refname, const struct object_id *oid,
 488                         int flag, void *cb_data)
 489{
 490        struct strbuf *buf = cb_data;
 491
 492        if (flag & REF_ISSYMREF) {
 493                const char *target = resolve_ref_unsafe(refname,
 494                                                        RESOLVE_REF_READING,
 495                                                        NULL, NULL);
 496
 497                if (target)
 498                        strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
 499        } else {
 500                strbuf_addf(buf, "%s\n", oid_to_hex(oid));
 501        }
 502
 503        return 0;
 504}
 505
 506static void get_head(struct strbuf *hdr, char *arg)
 507{
 508        struct strbuf buf = STRBUF_INIT;
 509
 510        select_getanyfile(hdr);
 511        head_ref_namespaced(show_head_ref, &buf);
 512        send_strbuf(hdr, "text/plain", &buf);
 513        strbuf_release(&buf);
 514}
 515
 516static void get_info_packs(struct strbuf *hdr, char *arg)
 517{
 518        size_t objdirlen = strlen(get_object_directory());
 519        struct strbuf buf = STRBUF_INIT;
 520        struct packed_git *p;
 521        size_t cnt = 0;
 522
 523        select_getanyfile(hdr);
 524        prepare_packed_git();
 525        for (p = packed_git; p; p = p->next) {
 526                if (p->pack_local)
 527                        cnt++;
 528        }
 529
 530        strbuf_grow(&buf, cnt * 53 + 2);
 531        for (p = packed_git; p; p = p->next) {
 532                if (p->pack_local)
 533                        strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
 534        }
 535        strbuf_addch(&buf, '\n');
 536
 537        hdr_nocache(hdr);
 538        send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
 539        strbuf_release(&buf);
 540}
 541
 542static void check_content_type(struct strbuf *hdr, const char *accepted_type)
 543{
 544        const char *actual_type = getenv("CONTENT_TYPE");
 545
 546        if (!actual_type)
 547                actual_type = "";
 548
 549        if (strcmp(actual_type, accepted_type)) {
 550                http_status(hdr, 415, "Unsupported Media Type");
 551                hdr_nocache(hdr);
 552                end_headers(hdr);
 553                format_write(1,
 554                        "Expected POST with Content-Type '%s',"
 555                        " but received '%s' instead.\n",
 556                        accepted_type, actual_type);
 557                exit(0);
 558        }
 559}
 560
 561static void service_rpc(struct strbuf *hdr, char *service_name)
 562{
 563        const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
 564        struct rpc_service *svc = select_service(hdr, service_name);
 565        struct strbuf buf = STRBUF_INIT;
 566
 567        strbuf_reset(&buf);
 568        strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
 569        check_content_type(hdr, buf.buf);
 570
 571        hdr_nocache(hdr);
 572
 573        strbuf_reset(&buf);
 574        strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
 575        hdr_str(hdr, content_type, buf.buf);
 576
 577        end_headers(hdr);
 578
 579        argv[0] = svc->name;
 580        run_service(argv, svc->buffer_input);
 581        strbuf_release(&buf);
 582}
 583
 584static int dead;
 585static NORETURN void die_webcgi(const char *err, va_list params)
 586{
 587        if (dead <= 1) {
 588                struct strbuf hdr = STRBUF_INIT;
 589
 590                vreportf("fatal: ", err, params);
 591
 592                http_status(&hdr, 500, "Internal Server Error");
 593                hdr_nocache(&hdr);
 594                end_headers(&hdr);
 595        }
 596        exit(0); /* we successfully reported a failure ;-) */
 597}
 598
 599static int die_webcgi_recursing(void)
 600{
 601        return dead++ > 1;
 602}
 603
 604static char* getdir(void)
 605{
 606        struct strbuf buf = STRBUF_INIT;
 607        char *pathinfo = getenv("PATH_INFO");
 608        char *root = getenv("GIT_PROJECT_ROOT");
 609        char *path = getenv("PATH_TRANSLATED");
 610
 611        if (root && *root) {
 612                if (!pathinfo || !*pathinfo)
 613                        die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
 614                if (daemon_avoid_alias(pathinfo))
 615                        die("'%s': aliased", pathinfo);
 616                end_url_with_slash(&buf, root);
 617                if (pathinfo[0] == '/')
 618                        pathinfo++;
 619                strbuf_addstr(&buf, pathinfo);
 620                return strbuf_detach(&buf, NULL);
 621        } else if (path && *path) {
 622                return xstrdup(path);
 623        } else
 624                die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
 625        return NULL;
 626}
 627
 628static struct service_cmd {
 629        const char *method;
 630        const char *pattern;
 631        void (*imp)(struct strbuf *, char *);
 632} services[] = {
 633        {"GET", "/HEAD$", get_head},
 634        {"GET", "/info/refs$", get_info_refs},
 635        {"GET", "/objects/info/alternates$", get_text_file},
 636        {"GET", "/objects/info/http-alternates$", get_text_file},
 637        {"GET", "/objects/info/packs$", get_info_packs},
 638        {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
 639        {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
 640        {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
 641
 642        {"POST", "/git-upload-pack$", service_rpc},
 643        {"POST", "/git-receive-pack$", service_rpc}
 644};
 645
 646static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
 647{
 648        const char *proto = getenv("SERVER_PROTOCOL");
 649
 650        if (proto && !strcmp(proto, "HTTP/1.1")) {
 651                http_status(hdr, 405, "Method Not Allowed");
 652                hdr_str(hdr, "Allow",
 653                        !strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
 654        } else
 655                http_status(hdr, 400, "Bad Request");
 656        hdr_nocache(hdr);
 657        end_headers(hdr);
 658        return 0;
 659}
 660
 661int cmd_main(int argc, const char **argv)
 662{
 663        char *method = getenv("REQUEST_METHOD");
 664        char *dir;
 665        struct service_cmd *cmd = NULL;
 666        char *cmd_arg = NULL;
 667        int i;
 668        struct strbuf hdr = STRBUF_INIT;
 669
 670        set_die_routine(die_webcgi);
 671        set_die_is_recursing_routine(die_webcgi_recursing);
 672
 673        if (!method)
 674                die("No REQUEST_METHOD from server");
 675        if (!strcmp(method, "HEAD"))
 676                method = "GET";
 677        dir = getdir();
 678
 679        for (i = 0; i < ARRAY_SIZE(services); i++) {
 680                struct service_cmd *c = &services[i];
 681                regex_t re;
 682                regmatch_t out[1];
 683
 684                if (regcomp(&re, c->pattern, REG_EXTENDED))
 685                        die("Bogus regex in service table: %s", c->pattern);
 686                if (!regexec(&re, dir, 1, out, 0)) {
 687                        size_t n;
 688
 689                        if (strcmp(method, c->method))
 690                                return bad_request(&hdr, c);
 691
 692                        cmd = c;
 693                        n = out[0].rm_eo - out[0].rm_so;
 694                        cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
 695                        dir[out[0].rm_so] = 0;
 696                        break;
 697                }
 698                regfree(&re);
 699        }
 700
 701        if (!cmd)
 702                not_found(&hdr, "Request not supported: '%s'", dir);
 703
 704        setup_path();
 705        if (!enter_repo(dir, 0))
 706                not_found(&hdr, "Not a git repository: '%s'", dir);
 707        if (!getenv("GIT_HTTP_EXPORT_ALL") &&
 708            access("git-daemon-export-ok", F_OK) )
 709                not_found(&hdr, "Repository not exported: '%s'", dir);
 710
 711        http_config();
 712        max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
 713                                           max_request_buffer);
 714
 715        cmd->imp(&hdr, cmd_arg);
 716        return 0;
 717}