uclient-http.c

   1 /*
   2  * uclient - ustream based protocol client library
   3  *
   4  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include <stdio.h>
  19 #include <ctype.h>
  20 #include <unistd.h>
  21 #include <stdint.h>
  22
  23 #include <libubox/ustream.h>
  24 #include <libubox/ustream-ssl.h>
  25 #include <libubox/usock.h>
  26 #include <libubox/blobmsg.h>
  27
  28 #include "uclient.h"
  29 #include "uclient-utils.h"
  30 #include "uclient-backend.h"
  31
  32 enum auth_type {
  33         AUTH_TYPE_UNKNOWN,
  34         AUTH_TYPE_NONE,
  35         AUTH_TYPE_BASIC,
  36         AUTH_TYPE_DIGEST,
  37 };
  38
  39 enum request_type {
  40         REQ_GET,
  41         REQ_HEAD,
  42         REQ_POST,
  43         REQ_PUT,
  44         __REQ_MAX
  45 };
  46
  47 enum http_state {
  48         HTTP_STATE_INIT,
  49         HTTP_STATE_HEADERS_SENT,
  50         HTTP_STATE_REQUEST_DONE,
  51         HTTP_STATE_RECV_HEADERS,
  52         HTTP_STATE_RECV_DATA,
  53         HTTP_STATE_ERROR,
  54 };
  55
  56 static const char * const request_types[__REQ_MAX] = {
  57         [REQ_GET] = "GET",
  58         [REQ_HEAD] = "HEAD",
  59         [REQ_POST] = "POST",
  60         [REQ_PUT] = "PUT",
  61 };
  62
  63 struct uclient_http {
  64         struct uclient uc;
  65
  66         const struct ustream_ssl_ops *ssl_ops;
  67         struct ustream_ssl_ctx *ssl_ctx;
  68         struct ustream *us;
  69
  70         struct ustream_fd ufd;
  71         struct ustream_ssl ussl;
  72
  73         struct uloop_timeout disconnect_t;
  74
  75         bool ssl_require_validation;
  76         bool ssl;
  77         bool eof;
  78         bool connection_close;
  79         bool disconnect;
  80         enum request_type req_type;
  81         enum http_state state;
  82
  83         enum auth_type auth_type;
  84         char *auth_str;
  85
  86         long read_chunked;
  87         long content_length;
  88
  89         uint32_t nc;
  90
  91         struct blob_buf headers;
  92         struct blob_buf meta;
  93 };
  94
  95 enum {
  96         PREFIX_HTTP,
  97         PREFIX_HTTPS,
  98         __PREFIX_MAX,
  99 };
 100
 101 static const char * const uclient_http_prefix[] = {
 102         [PREFIX_HTTP] = "http://",
 103         [PREFIX_HTTPS] = "https://",
 104         [__PREFIX_MAX] = NULL
 105 };
 106
 107 static int uclient_do_connect(struct uclient_http *uh, const char *port)
 108 {
 109         socklen_t sl;
 110         int fd;
 111
 112         if (uh->uc.url->port)
 113                 port = uh->uc.url->port;
 114
 115         fd = usock(USOCK_TCP | USOCK_NONBLOCK, uh->uc.url->host, port);
 116         if (fd < 0)
 117                 return -1;
 118
 119         ustream_fd_init(&uh->ufd, fd);
 120
 121         memset(&uh->uc.local_addr, 0, sizeof(uh->uc.local_addr));
 122         memset(&uh->uc.remote_addr, 0, sizeof(uh->uc.remote_addr));
 123
 124         sl = sizeof(uh->uc.local_addr);
 125         getsockname(fd, &uh->uc.local_addr.sa, &sl);
 126         getpeername(fd, &uh->uc.remote_addr.sa, &sl);
 127
 128         return 0;
 129 }
 130
 131 static void uclient_http_disconnect(struct uclient_http *uh)
 132 {
 133         uloop_timeout_cancel(&uh->disconnect_t);
 134         if (!uh->us)
 135                 return;
 136
 137         if (uh->ssl)
 138                 ustream_free(&uh->ussl.stream);
 139         ustream_free(&uh->ufd.stream);
 140         close(uh->ufd.fd.fd);
 141         uh->us = NULL;
 142 }
 143
 144 static void uclient_http_free_url_state(struct uclient *cl)
 145 {
 146         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 147
 148         uh->auth_type = AUTH_TYPE_UNKNOWN;
 149         free(uh->auth_str);
 150         uh->auth_str = NULL;
 151         uclient_http_disconnect(uh);
 152 }
 153
 154 static void uclient_http_error(struct uclient_http *uh, int code)
 155 {
 156         uh->state = HTTP_STATE_ERROR;
 157         uh->us->eof = true;
 158         ustream_state_change(uh->us);
 159         uclient_backend_set_error(&uh->uc, code);
 160 }
 161
 162 static void uclient_notify_eof(struct uclient_http *uh)
 163 {
 164         struct ustream *us = uh->us;
 165
 166         if (uh->disconnect)
 167                 return;
 168
 169         if (!uh->eof) {
 170                 if (!us->eof && !us->write_error)
 171                         return;
 172
 173                 if (ustream_pending_data(us, false))
 174                         return;
 175         }
 176
 177         uclient_backend_set_eof(&uh->uc);
 178
 179         if (uh->connection_close)
 180                 uclient_http_disconnect(uh);
 181 }
 182
 183 static void uclient_http_reset_state(struct uclient_http *uh)
 184 {
 185         uclient_backend_reset_state(&uh->uc);
 186         uh->read_chunked = -1;
 187         uh->content_length = -1;
 188         uh->eof = false;
 189         uh->disconnect = false;
 190         uh->connection_close = false;
 191         uh->state = HTTP_STATE_INIT;
 192
 193         if (uh->auth_type == AUTH_TYPE_UNKNOWN && !uh->uc.url->auth)
 194                 uh->auth_type = AUTH_TYPE_NONE;
 195 }
 196
 197 static void uclient_http_init_request(struct uclient_http *uh)
 198 {
 199         uclient_http_reset_state(uh);
 200         blob_buf_init(&uh->meta, 0);
 201 }
 202
 203 static enum auth_type
 204 uclient_http_update_auth_type(struct uclient_http *uh)
 205 {
 206         if (!uh->auth_str)
 207                 return AUTH_TYPE_NONE;
 208
 209         if (!strncasecmp(uh->auth_str, "basic", 5))
 210                 return AUTH_TYPE_BASIC;
 211
 212         if (!strncasecmp(uh->auth_str, "digest", 6))
 213                 return AUTH_TYPE_DIGEST;
 214
 215         return AUTH_TYPE_NONE;
 216 }
 217
 218 static void uclient_http_process_headers(struct uclient_http *uh)
 219 {
 220         enum {
 221                 HTTP_HDR_TRANSFER_ENCODING,
 222                 HTTP_HDR_CONNECTION,
 223                 HTTP_HDR_CONTENT_LENGTH,
 224                 HTTP_HDR_AUTH,
 225                 __HTTP_HDR_MAX,
 226         };
 227         static const struct blobmsg_policy hdr_policy[__HTTP_HDR_MAX] = {
 228 #define hdr(_name) { .name = _name, .type = BLOBMSG_TYPE_STRING }
 229                 [HTTP_HDR_TRANSFER_ENCODING] = hdr("transfer-encoding"),
 230                 [HTTP_HDR_CONNECTION] = hdr("connection"),
 231                 [HTTP_HDR_CONTENT_LENGTH] = hdr("content-length"),
 232                 [HTTP_HDR_AUTH] = hdr("www-authenticate"),
 233 #undef hdr
 234         };
 235         struct blob_attr *tb[__HTTP_HDR_MAX];
 236         struct blob_attr *cur;
 237
 238         blobmsg_parse(hdr_policy, __HTTP_HDR_MAX, tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
 239
 240         cur = tb[HTTP_HDR_TRANSFER_ENCODING];
 241         if (cur && strstr(blobmsg_data(cur), "chunked"))
 242                 uh->read_chunked = 0;
 243
 244         cur = tb[HTTP_HDR_CONNECTION];
 245         if (cur && strstr(blobmsg_data(cur), "close"))
 246                 uh->connection_close = true;
 247
 248         cur = tb[HTTP_HDR_CONTENT_LENGTH];
 249         if (cur)
 250                 uh->content_length = strtoul(blobmsg_data(cur), NULL, 10);
 251
 252         cur = tb[HTTP_HDR_AUTH];
 253         if (cur) {
 254                 free(uh->auth_str);
 255                 uh->auth_str = strdup(blobmsg_data(cur));
 256         }
 257
 258         uh->auth_type = uclient_http_update_auth_type(uh);
 259 }
 260
 261 static void
 262 uclient_http_add_auth_basic(struct uclient_http *uh)
 263 {
 264         struct uclient_url *url = uh->uc.url;
 265         int auth_len = strlen(url->auth);
 266         char *auth_buf;
 267
 268         if (auth_len > 512)
 269                 return;
 270
 271         auth_buf = alloca(base64_len(auth_len) + 1);
 272         base64_encode(url->auth, auth_len, auth_buf);
 273         ustream_printf(uh->us, "Authorization: Basic %s\r\n", auth_buf);
 274 }
 275
 276 static char *digest_unquote_sep(char **str)
 277 {
 278         char *cur = *str + 1;
 279         char *start = cur;
 280         char *out;
 281
 282         if (**str != '"')
 283                 return NULL;
 284
 285         out = cur;
 286         while (1) {
 287                 if (!*cur)
 288                         return NULL;
 289
 290                 if (*cur == '"') {
 291                         cur++;
 292                         break;
 293                 }
 294
 295                 if (*cur == '\\')
 296                         cur++;
 297
 298                 *(out++) = *(cur++);
 299         }
 300
 301         if (*cur == ',')
 302                 cur++;
 303
 304         *out = 0;
 305         *str = cur;
 306
 307         return start;
 308 }
 309
 310 static bool strmatch(char **str, const char *prefix)
 311 {
 312         int len = strlen(prefix);
 313
 314         if (strncmp(*str, prefix, len) != 0 || (*str)[len] != '=')
 315                 return false;
 316
 317         *str += len + 1;
 318         return true;
 319 }
 320
 321 static void
 322 get_cnonce(char *dest)
 323 {
 324         uint32_t val = 0;
 325         FILE *f;
 326
 327         f = fopen("/dev/urandom", "r");
 328         if (f) {
 329                 fread(&val, sizeof(val), 1, f);
 330                 fclose(f);
 331         }
 332
 333         bin_to_hex(dest, &val, sizeof(val));
 334 }
 335
 336 static void add_field(char **buf, int *ofs, int *len, const char *name, const char *val)
 337 {
 338         int available = *len - *ofs;
 339         int required;
 340         const char *next;
 341         char *cur;
 342
 343         if (*len && !*buf)
 344                 return;
 345
 346         required = strlen(name) + 4 + strlen(val) * 2;
 347         if (required > available)
 348                 *len += required - available + 64;
 349
 350         *buf = realloc(*buf, *len);
 351         if (!*buf)
 352                 return;
 353
 354         cur = *buf + *ofs;
 355         cur += sprintf(cur, ", %s=\"", name);
 356
 357         while ((next = strchr(val, '"'))) {
 358                 if (next > val) {
 359                         memcpy(cur, val, next - val);
 360                         cur += next - val;
 361                 }
 362
 363                 cur += sprintf(cur, "\\\"");
 364                 val = next + 1;
 365         }
 366
 367         cur += sprintf(cur, "%s\"", val);
 368         *ofs = cur - *buf;
 369 }
 370
 371 static void
 372 uclient_http_add_auth_digest(struct uclient_http *uh)
 373 {
 374         struct uclient_url *url = uh->uc.url;
 375         const char *realm = NULL, *opaque = NULL;
 376         const char *user, *password;
 377         char *buf, *next;
 378         int len, ofs;
 379
 380         char cnonce_str[9];
 381         char nc_str[9];
 382         char ahash[33];
 383         char hash[33];
 384
 385         struct http_digest_data data = {
 386                 .nc = nc_str,
 387                 .cnonce = cnonce_str,
 388                 .auth_hash = ahash,
 389         };
 390
 391         len = strlen(uh->auth_str) + 1;
 392         if (len > 512)
 393                 return;
 394
 395         buf = alloca(len);
 396         strcpy(buf, uh->auth_str);
 397
 398         /* skip auth type */
 399         strsep(&buf, " ");
 400
 401         next = buf;
 402         while (*next) {
 403                 const char **dest = NULL;
 404
 405                 while (isspace(*next))
 406                         next++;
 407
 408                 if (strmatch(&next, "realm"))
 409                         dest = &realm;
 410                 else if (strmatch(&next, "qop"))
 411                         dest = &data.qop;
 412                 else if (strmatch(&next, "nonce"))
 413                         dest = &data.nonce;
 414                 else if (strmatch(&next, "opaque"))
 415                         dest = &opaque;
 416                 else
 417                         return;
 418
 419                 *dest = digest_unquote_sep(&next);
 420         }
 421
 422         if (!realm || !data.qop || !data.nonce)
 423                 return;
 424
 425         sprintf(nc_str, "%08x", uh->nc++);
 426         get_cnonce(cnonce_str);
 427
 428         data.qop = "auth";
 429         data.uri = url->location;
 430         data.method = request_types[uh->req_type];
 431
 432         password = strchr(url->auth, ':');
 433         if (password) {
 434                 char *user_buf;
 435
 436                 len = password - url->auth;
 437                 if (len > 256)
 438                         return;
 439
 440                 user_buf = alloca(len + 1);
 441                 strncpy(user_buf, url->auth, len);
 442                 user_buf[len] = 0;
 443                 user = user_buf;
 444                 password++;
 445         } else {
 446                 user = url->auth;
 447                 password = "";
 448         }
 449
 450         http_digest_calculate_auth_hash(ahash, user, realm, password);
 451         http_digest_calculate_response(hash, &data);
 452
 453         buf = NULL;
 454         len = 0;
 455         ofs = 0;
 456
 457         add_field(&buf, &ofs, &len, "username", user);
 458         add_field(&buf, &ofs, &len, "realm", realm);
 459         add_field(&buf, &ofs, &len, "nonce", data.nonce);
 460         add_field(&buf, &ofs, &len, "uri", data.uri);
 461         add_field(&buf, &ofs, &len, "cnonce", data.cnonce);
 462         add_field(&buf, &ofs, &len, "response", hash);
 463         if (opaque)
 464                 add_field(&buf, &ofs, &len, "opaque", opaque);
 465
 466         ustream_printf(uh->us, "Authorization: Digest nc=%s, qop=%s%s\r\n", data.nc, data.qop, buf);
 467         free(buf);
 468 }
 469
 470 static void
 471 uclient_http_add_auth_header(struct uclient_http *uh)
 472 {
 473         if (!uh->uc.url->auth)
 474                 return;
 475
 476         switch (uh->auth_type) {
 477         case AUTH_TYPE_UNKNOWN:
 478         case AUTH_TYPE_NONE:
 479                 break;
 480         case AUTH_TYPE_BASIC:
 481                 uclient_http_add_auth_basic(uh);
 482                 break;
 483         case AUTH_TYPE_DIGEST:
 484                 uclient_http_add_auth_digest(uh);
 485                 break;
 486         }
 487 }
 488
 489 static void
 490 uclient_http_send_headers(struct uclient_http *uh)
 491 {
 492         struct uclient_url *url = uh->uc.url;
 493         struct blob_attr *cur;
 494         enum request_type req_type = uh->req_type;
 495         int rem;
 496
 497         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 498                 return;
 499
 500         ustream_printf(uh->us,
 501                 "%s %s HTTP/1.1\r\n"
 502                 "Host: %s\r\n",
 503                 request_types[req_type],
 504                 url->location, url->host);
 505
 506         blobmsg_for_each_attr(cur, uh->headers.head, rem)
 507                 ustream_printf(uh->us, "%s: %s\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
 508
 509         if (uh->req_type == REQ_POST || uh->req_type == REQ_PUT)
 510                 ustream_printf(uh->us, "Transfer-Encoding: chunked\r\n");
 511
 512         uclient_http_add_auth_header(uh);
 513
 514         ustream_printf(uh->us, "\r\n");
 515
 516         uh->state = HTTP_STATE_HEADERS_SENT;
 517 }
 518
 519 static void uclient_http_headers_complete(struct uclient_http *uh)
 520 {
 521         enum auth_type auth_type = uh->auth_type;
 522
 523         uh->state = HTTP_STATE_RECV_DATA;
 524         uh->uc.meta = uh->meta.head;
 525         uclient_http_process_headers(uh);
 526
 527         if (auth_type == AUTH_TYPE_UNKNOWN && uh->uc.status_code == 401 &&
 528             (uh->req_type == REQ_HEAD || uh->req_type == REQ_GET)) {
 529                 uclient_http_init_request(uh);
 530                 uclient_http_send_headers(uh);
 531                 uh->state = HTTP_STATE_REQUEST_DONE;
 532                 return;
 533         }
 534
 535         if (uh->uc.cb->header_done)
 536                 uh->uc.cb->header_done(&uh->uc);
 537
 538         if (uh->eof)
 539                 return;
 540
 541         if (uh->req_type == REQ_HEAD || uh->uc.status_code == 204) {
 542                 uh->eof = true;
 543                 uclient_notify_eof(uh);
 544         }
 545 }
 546
 547 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
 548 {
 549         char *name;
 550         char *sep;
 551
 552         if (uh->state == HTTP_STATE_REQUEST_DONE) {
 553                 char *code;
 554
 555                 /* HTTP/1.1 */
 556                 strsep(&data, " ");
 557
 558                 code = strsep(&data, " ");
 559                 if (!code)
 560                         goto error;
 561
 562                 uh->uc.status_code = strtoul(code, &sep, 10);
 563                 if (sep && *sep)
 564                         goto error;
 565
 566                 uh->state = HTTP_STATE_RECV_HEADERS;
 567                 return;
 568         }
 569
 570         if (!*data) {
 571                 uclient_http_headers_complete(uh);
 572                 return;
 573         }
 574
 575         sep = strchr(data, ':');
 576         if (!sep)
 577                 return;
 578
 579         *(sep++) = 0;
 580
 581         for (name = data; *name; name++)
 582                 *name = tolower(*name);
 583
 584         name = data;
 585         while (isspace(*sep))
 586                 sep++;
 587
 588         blobmsg_add_string(&uh->meta, name, sep);
 589         return;
 590
 591 error:
 592         uh->uc.status_code = 400;
 593         uh->eof = true;
 594         uclient_notify_eof(uh);
 595 }
 596
 597 static void __uclient_notify_read(struct uclient_http *uh)
 598 {
 599         struct uclient *uc = &uh->uc;
 600         char *data;
 601         int len;
 602
 603         if (uh->state < HTTP_STATE_REQUEST_DONE || uh->state == HTTP_STATE_ERROR)
 604                 return;
 605
 606         data = ustream_get_read_buf(uh->us, &len);
 607         if (!data || !len)
 608                 return;
 609
 610         if (uh->state < HTTP_STATE_RECV_DATA) {
 611                 char *sep;
 612                 int cur_len;
 613
 614                 do {
 615                         sep = strstr(data, "\r\n");
 616                         if (!sep)
 617                                 break;
 618
 619                         /* Check for multi-line HTTP headers */
 620                         if (sep > data) {
 621                                 if (!sep[2])
 622                                         return;
 623
 624                                 if (isspace(sep[2]) && sep[2] != '\r') {
 625                                         sep[0] = ' ';
 626                                         sep[1] = ' ';
 627                                         continue;
 628                                 }
 629                         }
 630
 631                         *sep = 0;
 632                         cur_len = sep + 2 - data;
 633                         uclient_parse_http_line(uh, data);
 634                         ustream_consume(uh->us, cur_len);
 635                         len -= cur_len;
 636
 637                         if (uh->eof)
 638                                 return;
 639
 640                         data = ustream_get_read_buf(uh->us, &len);
 641                 } while (data && uh->state < HTTP_STATE_RECV_DATA);
 642
 643                 if (!len)
 644                         return;
 645         }
 646
 647         if (uh->eof)
 648                 return;
 649
 650         if (uh->state == HTTP_STATE_RECV_DATA && uc->cb->data_read)
 651                 uc->cb->data_read(uc);
 652 }
 653
 654 static void __uclient_notify_write(struct uclient_http *uh)
 655 {
 656         struct uclient *uc = &uh->uc;
 657         uc->cb->data_sent(uc);
 658 }
 659
 660 static void uclient_notify_read(struct ustream *us, int bytes)
 661 {
 662         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 663
 664         __uclient_notify_read(uh);
 665 }
 666
 667 static void uclient_notify_write(struct ustream *us, int bytes)
 668 {
 669         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 670
 671         __uclient_notify_write(uh);
 672 }
 673
 674 static void uclient_notify_state(struct ustream *us)
 675 {
 676         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 677
 678         uclient_notify_eof(uh);
 679 }
 680
 681 static int uclient_setup_http(struct uclient_http *uh)
 682 {
 683         struct ustream *us = &uh->ufd.stream;
 684         int ret;
 685
 686         uh->us = us;
 687         uh->ssl = false;
 688
 689         us->string_data = true;
 690         us->notify_state = uclient_notify_state;
 691         us->notify_read = uclient_notify_read;
 692         us->notify_write = uclient_notify_write;
 693
 694         ret = uclient_do_connect(uh, "80");
 695         if (ret)
 696                 return UCLIENT_ERROR_CONNECT;
 697
 698         return 0;
 699 }
 700
 701 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
 702 {
 703         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 704
 705         __uclient_notify_read(uh);
 706 }
 707
 708 static void uclient_ssl_notify_write(struct ustream *us, int bytes)
 709 {
 710         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 711
 712         __uclient_notify_write(uh);
 713 }
 714
 715 static void uclient_ssl_notify_state(struct ustream *us)
 716 {
 717         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 718
 719         uclient_notify_eof(uh);
 720 }
 721
 722 static void uclient_ssl_notify_error(struct ustream_ssl *ssl, int error, const char *str)
 723 {
 724         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 725
 726         uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 727 }
 728
 729 static void uclient_ssl_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
 730 {
 731         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 732
 733         if (!uh->ssl_require_validation)
 734                 return;
 735
 736         uclient_http_error(uh, UCLIENT_ERROR_SSL_INVALID_CERT);
 737 }
 738
 739 static void uclient_ssl_notify_connected(struct ustream_ssl *ssl)
 740 {
 741         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 742
 743         if (!uh->ssl_require_validation)
 744                 return;
 745
 746         if (!uh->ussl.valid_cn)
 747                 uclient_http_error(uh, UCLIENT_ERROR_SSL_CN_MISMATCH);
 748 }
 749
 750 static int uclient_setup_https(struct uclient_http *uh)
 751 {
 752         struct ustream *us = &uh->ussl.stream;
 753         int ret;
 754
 755         uh->ssl = true;
 756         uh->us = us;
 757
 758         if (!uh->ssl_ctx)
 759                 return UCLIENT_ERROR_MISSING_SSL_CONTEXT;
 760
 761         ret = uclient_do_connect(uh, "443");
 762         if (ret)
 763                 return UCLIENT_ERROR_CONNECT;
 764
 765         us->string_data = true;
 766         us->notify_state = uclient_ssl_notify_state;
 767         us->notify_read = uclient_ssl_notify_read;
 768         us->notify_write = uclient_ssl_notify_write;
 769         uh->ussl.notify_error = uclient_ssl_notify_error;
 770         uh->ussl.notify_verify_error = uclient_ssl_notify_verify_error;
 771         uh->ussl.notify_connected = uclient_ssl_notify_connected;
 772         uh->ssl_ops->init(&uh->ussl, &uh->ufd.stream, uh->ssl_ctx, false);
 773         uh->ssl_ops->set_peer_cn(&uh->ussl, uh->uc.url->host);
 774
 775         return 0;
 776 }
 777
 778 static int uclient_http_connect(struct uclient *cl)
 779 {
 780         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 781         int ret;
 782
 783         uclient_http_init_request(uh);
 784
 785         if (uh->us)
 786                 return 0;
 787
 788         uh->ssl = cl->url->prefix == PREFIX_HTTPS;
 789
 790         if (uh->ssl)
 791                 ret = uclient_setup_https(uh);
 792         else
 793                 ret = uclient_setup_http(uh);
 794
 795         return ret;
 796 }
 797
 798 static void uclient_http_disconnect_cb(struct uloop_timeout *timeout)
 799 {
 800         struct uclient_http *uh = container_of(timeout, struct uclient_http, disconnect_t);
 801
 802         uclient_http_disconnect(uh);
 803 }
 804
 805 static struct uclient *uclient_http_alloc(void)
 806 {
 807         struct uclient_http *uh;
 808
 809         uh = calloc_a(sizeof(*uh));
 810         uh->disconnect_t.cb = uclient_http_disconnect_cb;
 811         blob_buf_init(&uh->headers, 0);
 812
 813         return &uh->uc;
 814 }
 815
 816 static void uclient_http_free_ssl_ctx(struct uclient_http *uh)
 817 {
 818         uh->ssl_ops = NULL;
 819         uh->ssl_ctx = NULL;
 820 }
 821
 822 static void uclient_http_free(struct uclient *cl)
 823 {
 824         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 825
 826         uclient_http_free_url_state(cl);
 827         uclient_http_free_ssl_ctx(uh);
 828         blob_buf_free(&uh->headers);
 829         blob_buf_free(&uh->meta);
 830         free(uh);
 831 }
 832
 833 int
 834 uclient_http_set_request_type(struct uclient *cl, const char *type)
 835 {
 836         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 837         int i;
 838
 839         if (cl->backend != &uclient_backend_http)
 840                 return -1;
 841
 842         if (uh->state > HTTP_STATE_INIT)
 843                 return -1;
 844
 845         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
 846                 if (strcmp(request_types[i], type) != 0)
 847                         continue;
 848
 849                 uh->req_type = i;
 850                 return 0;
 851         }
 852
 853         return -1;
 854 }
 855
 856 int
 857 uclient_http_reset_headers(struct uclient *cl)
 858 {
 859         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 860
 861         blob_buf_init(&uh->headers, 0);
 862
 863         return 0;
 864 }
 865
 866 int
 867 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
 868 {
 869         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 870
 871         if (cl->backend != &uclient_backend_http)
 872                 return -1;
 873
 874         if (uh->state > HTTP_STATE_INIT)
 875                 return -1;
 876
 877         blobmsg_add_string(&uh->headers, name, value);
 878         return 0;
 879 }
 880
 881 static int
 882 uclient_http_send_data(struct uclient *cl, char *buf, unsigned int len)
 883 {
 884         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 885
 886         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 887                 return -1;
 888
 889         uclient_http_send_headers(uh);
 890
 891         if (len > 0) {
 892                 ustream_printf(uh->us, "%X\r\n", len);
 893                 ustream_write(uh->us, buf, len, false);
 894                 ustream_printf(uh->us, "\r\n");
 895         }
 896
 897         return len;
 898 }
 899
 900 static int
 901 uclient_http_request_done(struct uclient *cl)
 902 {
 903         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 904
 905         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 906                 return -1;
 907
 908         uclient_http_send_headers(uh);
 909         if (uh->req_type == REQ_POST || uh->req_type == REQ_PUT)
 910                 ustream_printf(uh->us, "0\r\n\r\n");
 911         uh->state = HTTP_STATE_REQUEST_DONE;
 912
 913         return 0;
 914 }
 915
 916 static int
 917 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
 918 {
 919         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 920         int read_len = 0;
 921         char *data, *data_end;
 922
 923         if (uh->state < HTTP_STATE_RECV_DATA || !uh->us)
 924                 return 0;
 925
 926         data = ustream_get_read_buf(uh->us, &read_len);
 927         if (!data || !read_len)
 928                 return 0;
 929
 930         data_end = data + read_len;
 931         read_len = 0;
 932
 933         if (uh->read_chunked == 0) {
 934                 char *sep;
 935
 936                 if (data[0] == '\r' && data[1] == '\n') {
 937                         data += 2;
 938                         read_len += 2;
 939                 }
 940
 941                 sep = strstr(data, "\r\n");
 942                 if (!sep)
 943                         return 0;
 944
 945                 *sep = 0;
 946                 uh->read_chunked = strtoul(data, NULL, 16);
 947
 948                 read_len += sep + 2 - data;
 949                 data = sep + 2;
 950
 951                 if (!uh->read_chunked) {
 952                         uh->eof = true;
 953                         uh->uc.data_eof = true;
 954                 }
 955         }
 956
 957         if (len > data_end - data)
 958                 len = data_end - data;
 959
 960         if (uh->read_chunked >= 0) {
 961                 if (len > uh->read_chunked)
 962                         len = uh->read_chunked;
 963
 964                 uh->read_chunked -= len;
 965         } else if (uh->content_length >= 0) {
 966                 if (len > uh->content_length)
 967                         len = uh->content_length;
 968
 969                 uh->content_length -= len;
 970                 if (!uh->content_length) {
 971                         uh->eof = true;
 972                         uh->uc.data_eof = true;
 973                 }
 974         }
 975
 976         if (len > 0) {
 977                 read_len += len;
 978                 memcpy(buf, data, len);
 979         }
 980
 981         if (read_len > 0)
 982                 ustream_consume(uh->us, read_len);
 983
 984         uclient_notify_eof(uh);
 985
 986         return len;
 987 }
 988
 989 bool uclient_http_redirect(struct uclient *cl)
 990 {
 991         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 992         struct blobmsg_policy location = {
 993                 .name = "location",
 994                 .type = BLOBMSG_TYPE_STRING,
 995         };
 996         struct uclient_url *url = cl->url;
 997         struct blob_attr *tb;
 998
 999         if (cl->backend != &uclient_backend_http)
1000                 return false;
1001
1002         switch (cl->status_code) {
1003         case 301:
1004         case 302:
1005         case 307:
1006                 break;
1007         default:
1008                 return false;
1009         }
1010
1011         blobmsg_parse(&location, 1, &tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
1012         if (!tb)
1013                 return false;
1014
1015         url = uclient_get_url(blobmsg_data(tb), url->auth);
1016         if (!url)
1017                 return false;
1018
1019         free(cl->url);
1020         cl->url = url;
1021         uclient_http_connect(cl);
1022         uclient_http_request_done(cl);
1023
1024         return true;
1025 }
1026
1027 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
1028                              struct ustream_ssl_ctx *ctx, bool require_validation)
1029 {
1030         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1031
1032         if (cl->backend != &uclient_backend_http)
1033                 return -1;
1034
1035         uclient_http_free_url_state(cl);
1036
1037         uclient_http_free_ssl_ctx(uh);
1038         uh->ssl_ops = ops;
1039         uh->ssl_ctx = ctx;
1040         uh->ssl_require_validation = !!ctx && require_validation;
1041
1042         return 0;
1043 }
1044
1045 static void uclient_http_request_disconnect(struct uclient *cl)
1046 {
1047         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1048
1049         if (!uh->us)
1050                 return;
1051
1052         uh->eof = true;
1053         uh->disconnect = true;
1054         uloop_timeout_set(&uh->disconnect_t, 1);
1055 }
1056
1057 const struct uclient_backend uclient_backend_http = {
1058         .prefix = uclient_http_prefix,
1059
1060         .alloc = uclient_http_alloc,
1061         .free = uclient_http_free,
1062         .connect = uclient_http_connect,
1063         .disconnect = uclient_http_request_disconnect,
1064         .update_url = uclient_http_free_url_state,
1065
1066         .read = uclient_http_read,
1067         .write = uclient_http_send_data,
1068         .request = uclient_http_request_done,
1069 };