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 <sys/socket.h>
  19 #include <stdio.h>
  20 #include <ctype.h>
  21 #include <unistd.h>
  22 #include <stdint.h>
  23 #include <fcntl.h>
  24
  25 #include <libubox/ustream.h>
  26 #include <libubox/ustream-ssl.h>
  27 #include <libubox/usock.h>
  28 #include <libubox/blobmsg.h>
  29
  30 #include "uclient.h"
  31 #include "uclient-utils.h"
  32 #include "uclient-backend.h"
  33
  34 enum auth_type {
  35         AUTH_TYPE_UNKNOWN,
  36         AUTH_TYPE_NONE,
  37         AUTH_TYPE_BASIC,
  38         AUTH_TYPE_DIGEST,
  39 };
  40
  41 enum request_type {
  42         REQ_GET,
  43         REQ_HEAD,
  44         REQ_POST,
  45         REQ_PUT,
  46         REQ_DELETE,
  47         __REQ_MAX
  48 };
  49
  50 enum http_state {
  51         HTTP_STATE_INIT,
  52         HTTP_STATE_HEADERS_SENT,
  53         HTTP_STATE_REQUEST_DONE,
  54         HTTP_STATE_RECV_HEADERS,
  55         HTTP_STATE_RECV_DATA,
  56         HTTP_STATE_ERROR,
  57 };
  58
  59 static const char * const request_types[__REQ_MAX] = {
  60         [REQ_GET] = "GET",
  61         [REQ_HEAD] = "HEAD",
  62         [REQ_POST] = "POST",
  63         [REQ_PUT] = "PUT",
  64         [REQ_DELETE] = "DELETE",
  65 };
  66
  67 struct uclient_http {
  68         struct uclient uc;
  69
  70         const struct ustream_ssl_ops *ssl_ops;
  71         struct ustream_ssl_ctx *ssl_ctx;
  72         struct ustream *us;
  73
  74         struct ustream_fd ufd;
  75         struct ustream_ssl ussl;
  76
  77         struct uloop_timeout disconnect_t;
  78         unsigned int seq;
  79
  80         bool ssl_require_validation;
  81         bool ssl;
  82         bool eof;
  83         bool connection_close;
  84         bool disconnect;
  85         enum request_type req_type;
  86         enum http_state state;
  87
  88         enum auth_type auth_type;
  89         char *auth_str;
  90
  91         long read_chunked;
  92         long content_length;
  93
  94         int usock_flags;
  95
  96         uint32_t nc;
  97
  98         struct blob_buf headers;
  99         struct blob_buf meta;
 100 };
 101
 102 enum {
 103         PREFIX_HTTP,
 104         PREFIX_HTTPS,
 105         __PREFIX_MAX,
 106 };
 107
 108 static const char * const uclient_http_prefix[] = {
 109         [PREFIX_HTTP] = "http://",
 110         [PREFIX_HTTPS] = "https://",
 111         [__PREFIX_MAX] = NULL
 112 };
 113
 114 static int uclient_http_connect(struct uclient *cl);
 115
 116 static int uclient_do_connect(struct uclient_http *uh, const char *port)
 117 {
 118         socklen_t sl;
 119         int fd;
 120
 121         if (uh->uc.url->port)
 122                 port = uh->uc.url->port;
 123
 124         memset(&uh->uc.remote_addr, 0, sizeof(uh->uc.remote_addr));
 125
 126         fd = usock_inet_timeout(USOCK_TCP | USOCK_NONBLOCK | uh->usock_flags,
 127                                 uh->uc.url->host, port, &uh->uc.remote_addr,
 128                                 uh->uc.timeout_msecs);
 129         if (fd < 0)
 130                 return -1;
 131
 132         fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
 133         ustream_fd_init(&uh->ufd, fd);
 134
 135         sl = sizeof(uh->uc.local_addr);
 136         memset(&uh->uc.local_addr, 0, sl);
 137         getsockname(fd, &uh->uc.local_addr.sa, &sl);
 138
 139         return 0;
 140 }
 141
 142 static void uclient_http_disconnect(struct uclient_http *uh)
 143 {
 144         uloop_timeout_cancel(&uh->disconnect_t);
 145         if (!uh->us)
 146                 return;
 147
 148         if (uh->ssl)
 149                 ustream_free(&uh->ussl.stream);
 150         ustream_free(&uh->ufd.stream);
 151         close(uh->ufd.fd.fd);
 152         uh->us = NULL;
 153 }
 154
 155 static void uclient_http_free_url_state(struct uclient *cl)
 156 {
 157         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 158
 159         uh->auth_type = AUTH_TYPE_UNKNOWN;
 160         free(uh->auth_str);
 161         uh->auth_str = NULL;
 162         uclient_http_disconnect(uh);
 163 }
 164
 165 static void uclient_http_error(struct uclient_http *uh, int code)
 166 {
 167         uh->state = HTTP_STATE_ERROR;
 168         uh->us->eof = true;
 169         ustream_state_change(uh->us);
 170         uclient_backend_set_error(&uh->uc, code);
 171 }
 172
 173 static void uclient_http_request_disconnect(struct uclient *cl)
 174 {
 175         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 176
 177         if (!uh->us)
 178                 return;
 179
 180         uh->eof = true;
 181         uh->disconnect = true;
 182         uloop_timeout_set(&uh->disconnect_t, 1);
 183 }
 184
 185 static void uclient_notify_eof(struct uclient_http *uh)
 186 {
 187         struct ustream *us = uh->us;
 188
 189         if (uh->disconnect)
 190                 return;
 191
 192         if (!uh->eof) {
 193                 if (!us->eof && !us->write_error)
 194                         return;
 195
 196                 if (ustream_pending_data(us, false))
 197                         return;
 198         }
 199
 200         if (uh->content_length < 0 && uh->read_chunked >= 0)
 201                 uh->uc.data_eof = true;
 202
 203         uclient_backend_set_eof(&uh->uc);
 204
 205         if (uh->connection_close)
 206                 uclient_http_request_disconnect(&uh->uc);
 207 }
 208
 209 static void uclient_http_reset_state(struct uclient_http *uh)
 210 {
 211         uh->seq++;
 212         uclient_backend_reset_state(&uh->uc);
 213         uh->read_chunked = -1;
 214         uh->content_length = -1;
 215         uh->eof = false;
 216         uh->disconnect = false;
 217         uh->connection_close = false;
 218         uh->state = HTTP_STATE_INIT;
 219
 220         if (uh->auth_type == AUTH_TYPE_UNKNOWN && !uh->uc.url->auth)
 221                 uh->auth_type = AUTH_TYPE_NONE;
 222 }
 223
 224 static void uclient_http_init_request(struct uclient_http *uh)
 225 {
 226         uh->seq++;
 227         uclient_http_reset_state(uh);
 228         blob_buf_init(&uh->meta, 0);
 229 }
 230
 231 static enum auth_type
 232 uclient_http_update_auth_type(struct uclient_http *uh)
 233 {
 234         if (!uh->auth_str)
 235                 return AUTH_TYPE_NONE;
 236
 237         if (!strncasecmp(uh->auth_str, "basic", 5))
 238                 return AUTH_TYPE_BASIC;
 239
 240         if (!strncasecmp(uh->auth_str, "digest", 6))
 241                 return AUTH_TYPE_DIGEST;
 242
 243         return AUTH_TYPE_NONE;
 244 }
 245
 246 static void uclient_http_process_headers(struct uclient_http *uh)
 247 {
 248         enum {
 249                 HTTP_HDR_TRANSFER_ENCODING,
 250                 HTTP_HDR_CONNECTION,
 251                 HTTP_HDR_CONTENT_LENGTH,
 252                 HTTP_HDR_AUTH,
 253                 __HTTP_HDR_MAX,
 254         };
 255         static const struct blobmsg_policy hdr_policy[__HTTP_HDR_MAX] = {
 256 #define hdr(_name) { .name = _name, .type = BLOBMSG_TYPE_STRING }
 257                 [HTTP_HDR_TRANSFER_ENCODING] = hdr("transfer-encoding"),
 258                 [HTTP_HDR_CONNECTION] = hdr("connection"),
 259                 [HTTP_HDR_CONTENT_LENGTH] = hdr("content-length"),
 260                 [HTTP_HDR_AUTH] = hdr("www-authenticate"),
 261 #undef hdr
 262         };
 263         struct blob_attr *tb[__HTTP_HDR_MAX];
 264         struct blob_attr *cur;
 265
 266         blobmsg_parse(hdr_policy, __HTTP_HDR_MAX, tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
 267
 268         cur = tb[HTTP_HDR_TRANSFER_ENCODING];
 269         if (cur && strstr(blobmsg_data(cur), "chunked"))
 270                 uh->read_chunked = 0;
 271
 272         cur = tb[HTTP_HDR_CONNECTION];
 273         if (cur && strstr(blobmsg_data(cur), "close"))
 274                 uh->connection_close = true;
 275
 276         cur = tb[HTTP_HDR_CONTENT_LENGTH];
 277         if (cur)
 278                 uh->content_length = strtoul(blobmsg_data(cur), NULL, 10);
 279
 280         cur = tb[HTTP_HDR_AUTH];
 281         if (cur) {
 282                 free(uh->auth_str);
 283                 uh->auth_str = strdup(blobmsg_data(cur));
 284         }
 285
 286         uh->auth_type = uclient_http_update_auth_type(uh);
 287 }
 288
 289 static bool uclient_request_supports_body(enum request_type req_type)
 290 {
 291         switch (req_type) {
 292         case REQ_POST:
 293         case REQ_PUT:
 294         case REQ_DELETE:
 295                 return true;
 296         default:
 297                 return false;
 298         }
 299 }
 300
 301 static void
 302 uclient_http_add_auth_basic(struct uclient_http *uh)
 303 {
 304         struct uclient_url *url = uh->uc.url;
 305         int auth_len = strlen(url->auth);
 306         char *auth_buf;
 307
 308         if (auth_len > 512)
 309                 return;
 310
 311         auth_buf = alloca(base64_len(auth_len) + 1);
 312         base64_encode(url->auth, auth_len, auth_buf);
 313         ustream_printf(uh->us, "Authorization: Basic %s\r\n", auth_buf);
 314 }
 315
 316 static char *digest_unquote_sep(char **str)
 317 {
 318         char *cur = *str + 1;
 319         char *start = cur;
 320         char *out;
 321
 322         if (**str != '"')
 323                 return NULL;
 324
 325         out = cur;
 326         while (1) {
 327                 if (!*cur)
 328                         return NULL;
 329
 330                 if (*cur == '"') {
 331                         cur++;
 332                         break;
 333                 }
 334
 335                 if (*cur == '\\')
 336                         cur++;
 337
 338                 *(out++) = *(cur++);
 339         }
 340
 341         if (*cur == ',')
 342                 cur++;
 343
 344         *out = 0;
 345         *str = cur;
 346
 347         return start;
 348 }
 349
 350 static char *digest_sep(char **str)
 351 {
 352         char *cur, *next;
 353
 354         cur = *str;
 355         next = strchr(*str, ',');
 356         if (next) {
 357             *str = next + 1;
 358             *next = 0;
 359         } else {
 360             *str += strlen(*str);
 361         }
 362
 363         return cur;
 364 }
 365
 366 static bool strmatch(char **str, const char *prefix)
 367 {
 368         int len = strlen(prefix);
 369
 370         if (strncmp(*str, prefix, len) != 0 || (*str)[len] != '=')
 371                 return false;
 372
 373         *str += len + 1;
 374         return true;
 375 }
 376
 377 static void
 378 get_cnonce(char *dest)
 379 {
 380         uint32_t val = 0;
 381         FILE *f;
 382
 383         f = fopen("/dev/urandom", "r");
 384         if (f) {
 385                 fread(&val, sizeof(val), 1, f);
 386                 fclose(f);
 387         }
 388
 389         bin_to_hex(dest, &val, sizeof(val));
 390 }
 391
 392 static void add_field(char **buf, int *ofs, int *len, const char *name, const char *val)
 393 {
 394         int available = *len - *ofs;
 395         int required;
 396         const char *next;
 397         char *cur;
 398
 399         if (*len && !*buf)
 400                 return;
 401
 402         required = strlen(name) + 4 + strlen(val) * 2;
 403         if (required > available)
 404                 *len += required - available + 64;
 405
 406         *buf = realloc(*buf, *len);
 407         if (!*buf)
 408                 return;
 409
 410         cur = *buf + *ofs;
 411         cur += sprintf(cur, ", %s=\"", name);
 412
 413         while ((next = strchr(val, '"'))) {
 414                 if (next > val) {
 415                         memcpy(cur, val, next - val);
 416                         cur += next - val;
 417                 }
 418
 419                 cur += sprintf(cur, "\\\"");
 420                 val = next + 1;
 421         }
 422
 423         cur += sprintf(cur, "%s\"", val);
 424         *ofs = cur - *buf;
 425 }
 426
 427 static void
 428 uclient_http_add_auth_digest(struct uclient_http *uh)
 429 {
 430         struct uclient_url *url = uh->uc.url;
 431         const char *realm = NULL, *opaque = NULL;
 432         const char *user, *password;
 433         char *buf, *next;
 434         int len, ofs;
 435
 436         char cnonce_str[9];
 437         char nc_str[9];
 438         char ahash[33];
 439         char hash[33];
 440
 441         struct http_digest_data data = {
 442                 .nc = nc_str,
 443                 .cnonce = cnonce_str,
 444                 .auth_hash = ahash,
 445         };
 446
 447         len = strlen(uh->auth_str) + 1;
 448         if (len > 512)
 449                 return;
 450
 451         buf = alloca(len);
 452         strcpy(buf, uh->auth_str);
 453
 454         /* skip auth type */
 455         strsep(&buf, " ");
 456
 457         next = buf;
 458         while (*next) {
 459                 const char **dest = NULL;
 460                 const char *tmp;
 461
 462                 while (*next && isspace(*next))
 463                         next++;
 464
 465                 if (strmatch(&next, "realm"))
 466                         dest = &realm;
 467                 else if (strmatch(&next, "qop"))
 468                         dest = &data.qop;
 469                 else if (strmatch(&next, "nonce"))
 470                         dest = &data.nonce;
 471                 else if (strmatch(&next, "opaque"))
 472                         dest = &opaque;
 473                 else if (strmatch(&next, "stale") ||
 474                          strmatch(&next, "algorithm") ||
 475                          strmatch(&next, "auth-param")) {
 476                         digest_sep(&next);
 477                         continue;
 478                 } else if (strmatch(&next, "domain") ||
 479                          strmatch(&next, "qop-options"))
 480                         dest = &tmp;
 481                 else {
 482                         digest_sep(&next);
 483                         continue;
 484                 }
 485
 486                 *dest = digest_unquote_sep(&next);
 487         }
 488
 489         if (!realm || !data.qop || !data.nonce)
 490                 return;
 491
 492         sprintf(nc_str, "%08x", uh->nc++);
 493         get_cnonce(cnonce_str);
 494
 495         data.qop = "auth";
 496         data.uri = url->location;
 497         data.method = request_types[uh->req_type];
 498
 499         password = strchr(url->auth, ':');
 500         if (password) {
 501                 char *user_buf;
 502
 503                 len = password - url->auth;
 504                 if (len > 256)
 505                         return;
 506
 507                 user_buf = alloca(len + 1);
 508                 strncpy(user_buf, url->auth, len);
 509                 user_buf[len] = 0;
 510                 user = user_buf;
 511                 password++;
 512         } else {
 513                 user = url->auth;
 514                 password = "";
 515         }
 516
 517         http_digest_calculate_auth_hash(ahash, user, realm, password);
 518         http_digest_calculate_response(hash, &data);
 519
 520         buf = NULL;
 521         len = 0;
 522         ofs = 0;
 523
 524         add_field(&buf, &ofs, &len, "username", user);
 525         add_field(&buf, &ofs, &len, "realm", realm);
 526         add_field(&buf, &ofs, &len, "nonce", data.nonce);
 527         add_field(&buf, &ofs, &len, "uri", data.uri);
 528         add_field(&buf, &ofs, &len, "cnonce", data.cnonce);
 529         add_field(&buf, &ofs, &len, "response", hash);
 530         if (opaque)
 531                 add_field(&buf, &ofs, &len, "opaque", opaque);
 532
 533         ustream_printf(uh->us, "Authorization: Digest nc=%s, qop=%s%s\r\n", data.nc, data.qop, buf);
 534         free(buf);
 535 }
 536
 537 static void
 538 uclient_http_add_auth_header(struct uclient_http *uh)
 539 {
 540         if (!uh->uc.url->auth)
 541                 return;
 542
 543         switch (uh->auth_type) {
 544         case AUTH_TYPE_UNKNOWN:
 545         case AUTH_TYPE_NONE:
 546                 break;
 547         case AUTH_TYPE_BASIC:
 548                 uclient_http_add_auth_basic(uh);
 549                 break;
 550         case AUTH_TYPE_DIGEST:
 551                 uclient_http_add_auth_digest(uh);
 552                 break;
 553         }
 554 }
 555
 556 static void
 557 uclient_http_send_headers(struct uclient_http *uh)
 558 {
 559         struct uclient_url *url = uh->uc.url;
 560         struct blob_attr *cur;
 561         enum request_type req_type = uh->req_type;
 562         int rem;
 563
 564         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 565                 return;
 566
 567         if (uh->uc.proxy_url)
 568                 url = uh->uc.proxy_url;
 569
 570         ustream_printf(uh->us,
 571                 "%s %s HTTP/1.1\r\n"
 572                 "Host: %s\r\n",
 573                 request_types[req_type],
 574                 url->location, url->host);
 575
 576         blobmsg_for_each_attr(cur, uh->headers.head, rem)
 577                 ustream_printf(uh->us, "%s: %s\r\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
 578
 579         if (uclient_request_supports_body(uh->req_type))
 580                 ustream_printf(uh->us, "Transfer-Encoding: chunked\r\n");
 581
 582         uclient_http_add_auth_header(uh);
 583
 584         ustream_printf(uh->us, "\r\n");
 585
 586         uh->state = HTTP_STATE_HEADERS_SENT;
 587 }
 588
 589 static void uclient_http_headers_complete(struct uclient_http *uh)
 590 {
 591         enum auth_type auth_type = uh->auth_type;
 592         int seq = uh->uc.seq;
 593
 594         uh->state = HTTP_STATE_RECV_DATA;
 595         uh->uc.meta = uh->meta.head;
 596         uclient_http_process_headers(uh);
 597
 598         if (auth_type == AUTH_TYPE_UNKNOWN && uh->uc.status_code == 401 &&
 599             (uh->req_type == REQ_HEAD || uh->req_type == REQ_GET)) {
 600                 uclient_http_connect(&uh->uc);
 601                 uclient_http_send_headers(uh);
 602                 uh->state = HTTP_STATE_REQUEST_DONE;
 603                 return;
 604         }
 605
 606         if (uh->uc.cb->header_done)
 607                 uh->uc.cb->header_done(&uh->uc);
 608
 609         if (uh->eof || seq != uh->uc.seq)
 610                 return;
 611
 612         if (uh->req_type == REQ_HEAD || uh->uc.status_code == 204) {
 613                 uh->eof = true;
 614                 uclient_notify_eof(uh);
 615         }
 616 }
 617
 618 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
 619 {
 620         char *name;
 621         char *sep;
 622
 623         if (uh->state == HTTP_STATE_REQUEST_DONE) {
 624                 char *code;
 625
 626                 if (!strlen(data))
 627                         return;
 628
 629                 /* HTTP/1.1 */
 630                 strsep(&data, " ");
 631
 632                 code = strsep(&data, " ");
 633                 if (!code)
 634                         goto error;
 635
 636                 uh->uc.status_code = strtoul(code, &sep, 10);
 637                 if (sep && *sep)
 638                         goto error;
 639
 640                 uh->state = HTTP_STATE_RECV_HEADERS;
 641                 return;
 642         }
 643
 644         if (!*data) {
 645                 uclient_http_headers_complete(uh);
 646                 return;
 647         }
 648
 649         sep = strchr(data, ':');
 650         if (!sep)
 651                 return;
 652
 653         *(sep++) = 0;
 654
 655         for (name = data; *name; name++)
 656                 *name = tolower(*name);
 657
 658         name = data;
 659         while (isspace(*sep))
 660                 sep++;
 661
 662         blobmsg_add_string(&uh->meta, name, sep);
 663         return;
 664
 665 error:
 666         uh->uc.status_code = 400;
 667         uh->eof = true;
 668         uclient_notify_eof(uh);
 669 }
 670
 671 static void __uclient_notify_read(struct uclient_http *uh)
 672 {
 673         struct uclient *uc = &uh->uc;
 674         unsigned int seq = uh->seq;
 675         char *data;
 676         int len;
 677
 678         if (uh->state < HTTP_STATE_REQUEST_DONE || uh->state == HTTP_STATE_ERROR)
 679                 return;
 680
 681         data = ustream_get_read_buf(uh->us, &len);
 682         if (!data || !len)
 683                 return;
 684
 685         if (uh->state < HTTP_STATE_RECV_DATA) {
 686                 char *sep, *next;
 687                 int cur_len;
 688
 689                 do {
 690                         sep = strchr(data, '\n');
 691                         if (!sep)
 692                                 break;
 693
 694                         next = sep + 1;
 695                         if (sep > data && sep[-1] == '\r')
 696                                 sep--;
 697
 698                         /* Check for multi-line HTTP headers */
 699                         if (sep > data) {
 700                                 if (!*next)
 701                                         return;
 702
 703                                 if (isspace(*next) && *next != '\r' && *next != '\n') {
 704                                         sep[0] = ' ';
 705                                         if (sep + 1 < next)
 706                                                 sep[1] = ' ';
 707                                         continue;
 708                                 }
 709                         }
 710
 711                         *sep = 0;
 712                         cur_len = next - data;
 713                         uclient_parse_http_line(uh, data);
 714                         if (seq != uh->seq)
 715                                 return;
 716
 717                         ustream_consume(uh->us, cur_len);
 718                         len -= cur_len;
 719
 720                         if (uh->eof)
 721                                 return;
 722
 723                         data = ustream_get_read_buf(uh->us, &len);
 724                 } while (data && uh->state < HTTP_STATE_RECV_DATA);
 725
 726                 if (!len)
 727                         return;
 728         }
 729
 730         if (uh->eof)
 731                 return;
 732
 733         if (uh->state == HTTP_STATE_RECV_DATA) {
 734                 /* Now it's uclient user turn to read some data */
 735                 uloop_timeout_cancel(&uc->connection_timeout);
 736
 737                 if (uc->cb->data_read)
 738                         uc->cb->data_read(uc);
 739         }
 740 }
 741
 742 static void __uclient_notify_write(struct uclient_http *uh)
 743 {
 744         struct uclient *uc = &uh->uc;
 745
 746         if (uc->cb->data_sent)
 747                 uc->cb->data_sent(uc);
 748 }
 749
 750 static void uclient_notify_read(struct ustream *us, int bytes)
 751 {
 752         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 753
 754         __uclient_notify_read(uh);
 755 }
 756
 757 static void uclient_notify_write(struct ustream *us, int bytes)
 758 {
 759         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 760
 761         __uclient_notify_write(uh);
 762 }
 763
 764 static void uclient_notify_state(struct ustream *us)
 765 {
 766         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 767
 768         if (uh->ufd.stream.write_error) {
 769                 uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 770                 return;
 771         }
 772         uclient_notify_eof(uh);
 773 }
 774
 775 static int uclient_setup_http(struct uclient_http *uh)
 776 {
 777         struct ustream *us = &uh->ufd.stream;
 778         int ret;
 779
 780         uh->us = us;
 781         uh->ssl = false;
 782
 783         us->string_data = true;
 784         us->notify_state = uclient_notify_state;
 785         us->notify_read = uclient_notify_read;
 786         us->notify_write = uclient_notify_write;
 787
 788         ret = uclient_do_connect(uh, "80");
 789         if (ret)
 790                 return UCLIENT_ERROR_CONNECT;
 791
 792         return 0;
 793 }
 794
 795 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
 796 {
 797         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 798
 799         __uclient_notify_read(uh);
 800 }
 801
 802 static void uclient_ssl_notify_write(struct ustream *us, int bytes)
 803 {
 804         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 805
 806         __uclient_notify_write(uh);
 807 }
 808
 809 static void uclient_ssl_notify_state(struct ustream *us)
 810 {
 811         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 812
 813         uclient_notify_eof(uh);
 814 }
 815
 816 static void uclient_ssl_notify_error(struct ustream_ssl *ssl, int error, const char *str)
 817 {
 818         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 819
 820         uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 821 }
 822
 823 static void uclient_ssl_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
 824 {
 825         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 826
 827         if (!uh->ssl_require_validation)
 828                 return;
 829
 830         uclient_http_error(uh, UCLIENT_ERROR_SSL_INVALID_CERT);
 831 }
 832
 833 static void uclient_ssl_notify_connected(struct ustream_ssl *ssl)
 834 {
 835         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 836
 837         if (!uh->ssl_require_validation)
 838                 return;
 839
 840         if (!uh->ussl.valid_cn)
 841                 uclient_http_error(uh, UCLIENT_ERROR_SSL_CN_MISMATCH);
 842 }
 843
 844 static int uclient_setup_https(struct uclient_http *uh)
 845 {
 846         struct ustream *us = &uh->ussl.stream;
 847         int ret;
 848
 849         uh->ssl = true;
 850         uh->us = us;
 851
 852         if (!uh->ssl_ctx)
 853                 return UCLIENT_ERROR_MISSING_SSL_CONTEXT;
 854
 855         ret = uclient_do_connect(uh, "443");
 856         if (ret)
 857                 return UCLIENT_ERROR_CONNECT;
 858
 859         us->string_data = true;
 860         us->notify_state = uclient_ssl_notify_state;
 861         us->notify_read = uclient_ssl_notify_read;
 862         us->notify_write = uclient_ssl_notify_write;
 863         uh->ussl.notify_error = uclient_ssl_notify_error;
 864         uh->ussl.notify_verify_error = uclient_ssl_notify_verify_error;
 865         uh->ussl.notify_connected = uclient_ssl_notify_connected;
 866         uh->ussl.server_name = uh->uc.url->host;
 867         uh->ssl_ops->init(&uh->ussl, &uh->ufd.stream, uh->ssl_ctx, false);
 868         uh->ssl_ops->set_peer_cn(&uh->ussl, uh->uc.url->host);
 869
 870         return 0;
 871 }
 872
 873 static int uclient_http_connect(struct uclient *cl)
 874 {
 875         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 876         int ret;
 877
 878         if (!cl->eof || uh->disconnect || uh->connection_close)
 879                 uclient_http_disconnect(uh);
 880
 881         uclient_http_init_request(uh);
 882
 883         if (uh->us)
 884                 return 0;
 885
 886         uh->ssl = cl->url->prefix == PREFIX_HTTPS;
 887
 888         if (uh->ssl)
 889                 ret = uclient_setup_https(uh);
 890         else
 891                 ret = uclient_setup_http(uh);
 892
 893         return ret;
 894 }
 895
 896 static void uclient_http_disconnect_cb(struct uloop_timeout *timeout)
 897 {
 898         struct uclient_http *uh = container_of(timeout, struct uclient_http, disconnect_t);
 899
 900         uclient_http_disconnect(uh);
 901 }
 902
 903 static struct uclient *uclient_http_alloc(void)
 904 {
 905         struct uclient_http *uh;
 906
 907         uh = calloc_a(sizeof(*uh));
 908         uh->disconnect_t.cb = uclient_http_disconnect_cb;
 909         blob_buf_init(&uh->headers, 0);
 910
 911         return &uh->uc;
 912 }
 913
 914 static void uclient_http_free_ssl_ctx(struct uclient_http *uh)
 915 {
 916         uh->ssl_ops = NULL;
 917         uh->ssl_ctx = NULL;
 918 }
 919
 920 static void uclient_http_free(struct uclient *cl)
 921 {
 922         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 923
 924         uclient_http_free_url_state(cl);
 925         uclient_http_free_ssl_ctx(uh);
 926         blob_buf_free(&uh->headers);
 927         blob_buf_free(&uh->meta);
 928         free(uh);
 929 }
 930
 931 int
 932 uclient_http_set_request_type(struct uclient *cl, const char *type)
 933 {
 934         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 935         int i;
 936
 937         if (cl->backend != &uclient_backend_http)
 938                 return -1;
 939
 940         if (uh->state > HTTP_STATE_INIT)
 941                 return -1;
 942
 943         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
 944                 if (strcmp(request_types[i], type) != 0)
 945                         continue;
 946
 947                 uh->req_type = i;
 948                 return 0;
 949         }
 950
 951         return -1;
 952 }
 953
 954 int
 955 uclient_http_reset_headers(struct uclient *cl)
 956 {
 957         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 958
 959         blob_buf_init(&uh->headers, 0);
 960
 961         return 0;
 962 }
 963
 964 int
 965 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
 966 {
 967         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 968
 969         if (cl->backend != &uclient_backend_http)
 970                 return -1;
 971
 972         if (uh->state > HTTP_STATE_INIT)
 973                 return -1;
 974
 975         blobmsg_add_string(&uh->headers, name, value);
 976         return 0;
 977 }
 978
 979 static int
 980 uclient_http_send_data(struct uclient *cl, const char *buf, unsigned int len)
 981 {
 982         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 983
 984         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 985                 return -1;
 986
 987         uclient_http_send_headers(uh);
 988
 989         if (len > 0) {
 990                 ustream_printf(uh->us, "%X\r\n", len);
 991                 ustream_write(uh->us, buf, len, false);
 992                 ustream_printf(uh->us, "\r\n");
 993         }
 994
 995         return len;
 996 }
 997
 998 static int
 999 uclient_http_request_done(struct uclient *cl)
1000 {
1001         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1002
1003         if (uh->state >= HTTP_STATE_REQUEST_DONE)
1004                 return -1;
1005
1006         uclient_http_send_headers(uh);
1007         if (uclient_request_supports_body(uh->req_type))
1008                 ustream_printf(uh->us, "0\r\n\r\n");
1009         uh->state = HTTP_STATE_REQUEST_DONE;
1010
1011         return 0;
1012 }
1013
1014 static int
1015 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
1016 {
1017         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1018         int read_len = 0;
1019         char *data, *data_end;
1020
1021         if (uh->state < HTTP_STATE_RECV_DATA || !uh->us)
1022                 return 0;
1023
1024         data = ustream_get_read_buf(uh->us, &read_len);
1025         if (!data || !read_len)
1026                 return 0;
1027
1028         data_end = data + read_len;
1029         read_len = 0;
1030
1031         if (uh->read_chunked == 0) {
1032                 char *sep;
1033
1034                 if (data[0] == '\r' && data[1] == '\n') {
1035                         data += 2;
1036                         read_len += 2;
1037                 }
1038
1039                 sep = strstr(data, "\r\n");
1040                 if (!sep)
1041                         return 0;
1042
1043                 *sep = 0;
1044                 uh->read_chunked = strtoul(data, NULL, 16);
1045
1046                 read_len += sep + 2 - data;
1047                 data = sep + 2;
1048
1049                 if (!uh->read_chunked) {
1050                         uh->eof = true;
1051                         uh->uc.data_eof = true;
1052                 }
1053         }
1054
1055         if (len > data_end - data)
1056                 len = data_end - data;
1057
1058         if (uh->read_chunked >= 0) {
1059                 if (len > uh->read_chunked)
1060                         len = uh->read_chunked;
1061
1062                 uh->read_chunked -= len;
1063         } else if (uh->content_length >= 0) {
1064                 if (len > uh->content_length)
1065                         len = uh->content_length;
1066
1067                 uh->content_length -= len;
1068                 if (!uh->content_length) {
1069                         uh->eof = true;
1070                         uh->uc.data_eof = true;
1071                 }
1072         }
1073
1074         if (len > 0) {
1075                 read_len += len;
1076                 memcpy(buf, data, len);
1077         }
1078
1079         if (read_len > 0)
1080                 ustream_consume(uh->us, read_len);
1081
1082         uclient_notify_eof(uh);
1083
1084         /* Now that we consumed something and if this isn't EOF, start timer again */
1085         if (!uh->uc.eof && !cl->connection_timeout.pending)
1086                 uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
1087
1088         return len;
1089 }
1090
1091 int uclient_http_redirect(struct uclient *cl)
1092 {
1093         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1094         struct blobmsg_policy location = {
1095                 .name = "location",
1096                 .type = BLOBMSG_TYPE_STRING,
1097         };
1098         struct uclient_url *url = cl->url;
1099         struct blob_attr *tb;
1100
1101         if (cl->backend != &uclient_backend_http)
1102                 return false;
1103
1104         switch (cl->status_code) {
1105         case 301:
1106         case 302:
1107         case 307:
1108                 break;
1109         default:
1110                 return false;
1111         }
1112
1113         blobmsg_parse(&location, 1, &tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
1114         if (!tb)
1115                 return false;
1116
1117         url = uclient_get_url(blobmsg_data(tb), url->auth);
1118         if (!url)
1119                 return false;
1120
1121         free(cl->url);
1122         cl->url = url;
1123         if (uclient_http_connect(cl))
1124                 return -1;
1125
1126         uclient_http_request_done(cl);
1127
1128         return true;
1129 }
1130
1131 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
1132                              struct ustream_ssl_ctx *ctx, bool require_validation)
1133 {
1134         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1135
1136         if (cl->backend != &uclient_backend_http)
1137                 return -1;
1138
1139         uclient_http_free_url_state(cl);
1140
1141         uclient_http_free_ssl_ctx(uh);
1142         uh->ssl_ops = ops;
1143         uh->ssl_ctx = ctx;
1144         uh->ssl_require_validation = !!ctx && require_validation;
1145
1146         return 0;
1147 }
1148
1149 int uclient_http_set_address_family(struct uclient *cl, int af)
1150 {
1151         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1152
1153         if (cl->backend != &uclient_backend_http)
1154                 return -1;
1155
1156         switch (af) {
1157         case AF_INET:
1158                 uh->usock_flags = USOCK_IPV4ONLY;
1159                 break;
1160         case AF_INET6:
1161                 uh->usock_flags = USOCK_IPV6ONLY;
1162                 break;
1163         default:
1164                 uh->usock_flags = 0;
1165                 break;
1166         }
1167
1168         return 0;
1169 }
1170
1171 const struct uclient_backend uclient_backend_http = {
1172         .prefix = uclient_http_prefix,
1173
1174         .alloc = uclient_http_alloc,
1175         .free = uclient_http_free,
1176         .connect = uclient_http_connect,
1177         .disconnect = uclient_http_request_disconnect,
1178         .update_url = uclient_http_free_url_state,
1179         .update_proxy_url = uclient_http_free_url_state,
1180
1181         .read = uclient_http_read,
1182         .write = uclient_http_send_data,
1183         .request = uclient_http_request_done,
1184 };