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 <string.h>
  24 #include <fcntl.h>
  25
  26 #include <libubox/ustream.h>
  27 #include <libubox/ustream-ssl.h>
  28 #include <libubox/usock.h>
  29 #include <libubox/blobmsg.h>
  30
  31 #include "uclient.h"
  32 #include "uclient-utils.h"
  33 #include "uclient-backend.h"
  34
  35 enum auth_type {
  36         AUTH_TYPE_UNKNOWN,
  37         AUTH_TYPE_NONE,
  38         AUTH_TYPE_BASIC,
  39         AUTH_TYPE_DIGEST,
  40 };
  41
  42 enum request_type {
  43         REQ_GET,
  44         REQ_HEAD,
  45         REQ_POST,
  46         REQ_PUT,
  47         REQ_DELETE,
  48         __REQ_MAX
  49 };
  50
  51 enum http_state {
  52         HTTP_STATE_INIT,
  53         HTTP_STATE_HEADERS_SENT,
  54         HTTP_STATE_REQUEST_DONE,
  55         HTTP_STATE_RECV_HEADERS,
  56         HTTP_STATE_RECV_DATA,
  57         HTTP_STATE_ERROR,
  58 };
  59
  60 static const char * const request_types[__REQ_MAX] = {
  61         [REQ_GET] = "GET",
  62         [REQ_HEAD] = "HEAD",
  63         [REQ_POST] = "POST",
  64         [REQ_PUT] = "PUT",
  65         [REQ_DELETE] = "DELETE",
  66 };
  67
  68 struct uclient_http {
  69         struct uclient uc;
  70
  71         const struct ustream_ssl_ops *ssl_ops;
  72         struct ustream_ssl_ctx *ssl_ctx;
  73         struct ustream *us;
  74
  75         struct ustream_fd ufd;
  76         struct ustream_ssl ussl;
  77
  78         struct uloop_timeout disconnect_t;
  79         unsigned int seq;
  80
  81         bool ssl_require_validation;
  82         bool ssl;
  83         bool eof;
  84         bool connection_close;
  85         bool disconnect;
  86         enum request_type req_type;
  87         enum http_state state;
  88
  89         enum auth_type auth_type;
  90         char *auth_str;
  91
  92         long read_chunked;
  93         long content_length;
  94
  95         int usock_flags;
  96
  97         uint32_t nc;
  98
  99         struct blob_buf headers;
 100         struct blob_buf meta;
 101 };
 102
 103 enum {
 104         PREFIX_HTTP,
 105         PREFIX_HTTPS,
 106         __PREFIX_MAX,
 107 };
 108
 109 static const char * const uclient_http_prefix[] = {
 110         [PREFIX_HTTP] = "http://",
 111         [PREFIX_HTTPS] = "https://",
 112         [__PREFIX_MAX] = NULL
 113 };
 114
 115 static int uclient_http_connect(struct uclient *cl);
 116
 117 static int uclient_do_connect(struct uclient_http *uh, const char *port)
 118 {
 119         socklen_t sl;
 120         int fd;
 121
 122         if (uh->uc.url->port)
 123                 port = uh->uc.url->port;
 124
 125         memset(&uh->uc.remote_addr, 0, sizeof(uh->uc.remote_addr));
 126
 127         fd = usock_inet_timeout(USOCK_TCP | USOCK_NONBLOCK | uh->usock_flags,
 128                                 uh->uc.url->host, port, &uh->uc.remote_addr,
 129                                 uh->uc.timeout_msecs);
 130         if (fd < 0)
 131                 return -1;
 132
 133         fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
 134         ustream_fd_init(&uh->ufd, fd);
 135
 136         sl = sizeof(uh->uc.local_addr);
 137         memset(&uh->uc.local_addr, 0, sl);
 138         getsockname(fd, &uh->uc.local_addr.sa, &sl);
 139
 140         return 0;
 141 }
 142
 143 static void uclient_http_disconnect(struct uclient_http *uh)
 144 {
 145         uloop_timeout_cancel(&uh->disconnect_t);
 146         if (!uh->us)
 147                 return;
 148
 149         if (uh->ssl)
 150                 ustream_free(&uh->ussl.stream);
 151         ustream_free(&uh->ufd.stream);
 152         close(uh->ufd.fd.fd);
 153         uh->us = NULL;
 154 }
 155
 156 static void uclient_http_free_url_state(struct uclient *cl)
 157 {
 158         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 159
 160         uh->auth_type = AUTH_TYPE_UNKNOWN;
 161         free(uh->auth_str);
 162         uh->auth_str = NULL;
 163         uclient_http_disconnect(uh);
 164 }
 165
 166 static void uclient_http_error(struct uclient_http *uh, int code)
 167 {
 168         uh->state = HTTP_STATE_ERROR;
 169         uh->us->eof = true;
 170         ustream_state_change(uh->us);
 171         uclient_backend_set_error(&uh->uc, code);
 172 }
 173
 174 static void uclient_http_request_disconnect(struct uclient *cl)
 175 {
 176         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 177
 178         if (!uh->us)
 179                 return;
 180
 181         uh->eof = true;
 182         uh->disconnect = true;
 183         uloop_timeout_set(&uh->disconnect_t, 1);
 184 }
 185
 186 static void uclient_notify_eof(struct uclient_http *uh)
 187 {
 188         struct ustream *us = uh->us;
 189
 190         if (uh->disconnect)
 191                 return;
 192
 193         if (!uh->eof) {
 194                 if (!us->eof && !us->write_error)
 195                         return;
 196
 197                 if (ustream_pending_data(us, false))
 198                         return;
 199         }
 200
 201         if (uh->content_length < 0 && uh->read_chunked >= 0)
 202                 uh->uc.data_eof = true;
 203
 204         uclient_backend_set_eof(&uh->uc);
 205
 206         if (uh->connection_close)
 207                 uclient_http_request_disconnect(&uh->uc);
 208 }
 209
 210 static void uclient_http_reset_state(struct uclient_http *uh)
 211 {
 212         uh->seq++;
 213         uclient_backend_reset_state(&uh->uc);
 214         uh->read_chunked = -1;
 215         uh->content_length = -1;
 216         uh->eof = false;
 217         uh->disconnect = false;
 218         uh->connection_close = false;
 219         uh->state = HTTP_STATE_INIT;
 220
 221         if (uh->auth_type == AUTH_TYPE_UNKNOWN && !uh->uc.url->auth)
 222                 uh->auth_type = AUTH_TYPE_NONE;
 223 }
 224
 225 static void uclient_http_init_request(struct uclient_http *uh)
 226 {
 227         uh->seq++;
 228         uclient_http_reset_state(uh);
 229         blob_buf_init(&uh->meta, 0);
 230 }
 231
 232 static enum auth_type
 233 uclient_http_update_auth_type(struct uclient_http *uh)
 234 {
 235         if (!uh->auth_str)
 236                 return AUTH_TYPE_NONE;
 237
 238         if (!strncasecmp(uh->auth_str, "basic", 5))
 239                 return AUTH_TYPE_BASIC;
 240
 241         if (!strncasecmp(uh->auth_str, "digest", 6))
 242                 return AUTH_TYPE_DIGEST;
 243
 244         return AUTH_TYPE_NONE;
 245 }
 246
 247 static void uclient_http_process_headers(struct uclient_http *uh)
 248 {
 249         enum {
 250                 HTTP_HDR_TRANSFER_ENCODING,
 251                 HTTP_HDR_CONNECTION,
 252                 HTTP_HDR_CONTENT_LENGTH,
 253                 HTTP_HDR_AUTH,
 254                 __HTTP_HDR_MAX,
 255         };
 256         static const struct blobmsg_policy hdr_policy[__HTTP_HDR_MAX] = {
 257 #define hdr(_name) { .name = _name, .type = BLOBMSG_TYPE_STRING }
 258                 [HTTP_HDR_TRANSFER_ENCODING] = hdr("transfer-encoding"),
 259                 [HTTP_HDR_CONNECTION] = hdr("connection"),
 260                 [HTTP_HDR_CONTENT_LENGTH] = hdr("content-length"),
 261                 [HTTP_HDR_AUTH] = hdr("www-authenticate"),
 262 #undef hdr
 263         };
 264         struct blob_attr *tb[__HTTP_HDR_MAX];
 265         struct blob_attr *cur;
 266
 267         blobmsg_parse(hdr_policy, __HTTP_HDR_MAX, tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
 268
 269         cur = tb[HTTP_HDR_TRANSFER_ENCODING];
 270         if (cur && strstr(blobmsg_data(cur), "chunked"))
 271                 uh->read_chunked = 0;
 272
 273         cur = tb[HTTP_HDR_CONNECTION];
 274         if (cur && strstr(blobmsg_data(cur), "close"))
 275                 uh->connection_close = true;
 276
 277         cur = tb[HTTP_HDR_CONTENT_LENGTH];
 278         if (cur)
 279                 uh->content_length = strtoul(blobmsg_data(cur), NULL, 10);
 280
 281         cur = tb[HTTP_HDR_AUTH];
 282         if (cur) {
 283                 free(uh->auth_str);
 284                 uh->auth_str = strdup(blobmsg_data(cur));
 285         }
 286
 287         uh->auth_type = uclient_http_update_auth_type(uh);
 288 }
 289
 290 static bool uclient_request_supports_body(enum request_type req_type)
 291 {
 292         switch (req_type) {
 293         case REQ_POST:
 294         case REQ_PUT:
 295         case REQ_DELETE:
 296                 return true;
 297         default:
 298                 return false;
 299         }
 300 }
 301
 302 static int
 303 uclient_http_add_auth_basic(struct uclient_http *uh)
 304 {
 305         struct uclient_url *url = uh->uc.url;
 306         int auth_len = strlen(url->auth);
 307         char *auth_buf;
 308
 309         if (auth_len > 512)
 310                 return -EINVAL;
 311
 312         auth_buf = alloca(base64_len(auth_len) + 1);
 313         if (!auth_buf)
 314                 return -ENOMEM;
 315
 316         base64_encode(url->auth, auth_len, auth_buf);
 317         ustream_printf(uh->us, "Authorization: Basic %s\r\n", auth_buf);
 318
 319         return 0;
 320 }
 321
 322 static char *digest_unquote_sep(char **str)
 323 {
 324         char *cur = *str + 1;
 325         char *start = cur;
 326         char *out;
 327
 328         if (**str != '"')
 329                 return NULL;
 330
 331         out = cur;
 332         while (1) {
 333                 if (!*cur)
 334                         return NULL;
 335
 336                 if (*cur == '"') {
 337                         cur++;
 338                         break;
 339                 }
 340
 341                 if (*cur == '\\')
 342                         cur++;
 343
 344                 *(out++) = *(cur++);
 345         }
 346
 347         if (*cur == ',')
 348                 cur++;
 349
 350         *out = 0;
 351         *str = cur;
 352
 353         return start;
 354 }
 355
 356 static char *digest_sep(char **str)
 357 {
 358         char *cur, *next;
 359
 360         cur = *str;
 361         next = strchr(*str, ',');
 362         if (next) {
 363             *str = next + 1;
 364             *next = 0;
 365         } else {
 366             *str += strlen(*str);
 367         }
 368
 369         return cur;
 370 }
 371
 372 static bool strmatch(char **str, const char *prefix)
 373 {
 374         int len = strlen(prefix);
 375
 376         if (strncmp(*str, prefix, len) != 0 || (*str)[len] != '=')
 377                 return false;
 378
 379         *str += len + 1;
 380         return true;
 381 }
 382
 383 static void
 384 get_cnonce(char *dest)
 385 {
 386         uint32_t val = 0;
 387         FILE *f;
 388         size_t n;
 389
 390         f = fopen("/dev/urandom", "r");
 391         if (f) {
 392                 n = fread(&val, sizeof(val), 1, f);
 393                 fclose(f);
 394                 if (n != 1)
 395                         return;
 396         }
 397
 398         bin_to_hex(dest, &val, sizeof(val));
 399 }
 400
 401 static void add_field(char **buf, int *ofs, int *len, const char *name, const char *val)
 402 {
 403         int available = *len - *ofs;
 404         int required;
 405         const char *next;
 406         char *cur;
 407
 408         if (*len && !*buf)
 409                 return;
 410
 411         required = strlen(name) + 4 + strlen(val) * 2;
 412         if (required > available)
 413                 *len += required - available + 64;
 414
 415         *buf = realloc(*buf, *len);
 416         if (!*buf)
 417                 return;
 418
 419         cur = *buf + *ofs;
 420         cur += sprintf(cur, ", %s=\"", name);
 421
 422         while ((next = strchr(val, '"'))) {
 423                 if (next > val) {
 424                         memcpy(cur, val, next - val);
 425                         cur += next - val;
 426                 }
 427
 428                 cur += sprintf(cur, "\\\"");
 429                 val = next + 1;
 430         }
 431
 432         cur += sprintf(cur, "%s\"", val);
 433         *ofs = cur - *buf;
 434 }
 435
 436 static int
 437 uclient_http_add_auth_digest(struct uclient_http *uh)
 438 {
 439         int err = 0;
 440         struct uclient_url *url = uh->uc.url;
 441         const char *realm = NULL, *opaque = NULL;
 442         const char *user, *password;
 443         char *buf, *next, *buf_orig;
 444         int len, ofs;
 445
 446         char cnonce_str[9];
 447         char nc_str[9];
 448         char ahash[33];
 449         char hash[33];
 450
 451         struct http_digest_data data = {
 452                 .nc = nc_str,
 453                 .cnonce = cnonce_str,
 454                 .auth_hash = ahash,
 455         };
 456
 457         len = strlen(uh->auth_str) + 1;
 458         if (len > 512) {
 459                 err = -EINVAL;
 460                 goto fail;
 461         }
 462
 463         buf = alloca(len);
 464         if (!buf) {
 465                 err = -ENOMEM;
 466                 goto fail;
 467         }
 468
 469         strcpy(buf, uh->auth_str);
 470
 471         /* skip auth type */
 472         buf_orig = strsep(&buf, " ");
 473
 474         next = buf;
 475         while (*next) {
 476                 const char **dest = NULL;
 477                 const char *tmp;
 478
 479                 while (*next && isspace(*next))
 480                         next++;
 481
 482                 if (strmatch(&next, "realm"))
 483                         dest = &realm;
 484                 else if (strmatch(&next, "qop"))
 485                         dest = &data.qop;
 486                 else if (strmatch(&next, "nonce"))
 487                         dest = &data.nonce;
 488                 else if (strmatch(&next, "opaque"))
 489                         dest = &opaque;
 490                 else if (strmatch(&next, "stale") ||
 491                          strmatch(&next, "algorithm") ||
 492                          strmatch(&next, "auth-param")) {
 493                         digest_sep(&next);
 494                         continue;
 495                 } else if (strmatch(&next, "domain") ||
 496                          strmatch(&next, "qop-options"))
 497                         dest = &tmp;
 498                 else {
 499                         digest_sep(&next);
 500                         continue;
 501                 }
 502
 503                 *dest = digest_unquote_sep(&next);
 504         }
 505
 506         if (!realm || !data.qop || !data.nonce) {
 507                 err = -EINVAL;
 508                 goto fail_buf;
 509         }
 510
 511         sprintf(nc_str, "%08x", uh->nc++);
 512         get_cnonce(cnonce_str);
 513
 514         data.qop = "auth";
 515         data.uri = url->location;
 516         data.method = request_types[uh->req_type];
 517
 518         password = strchr(url->auth, ':');
 519         if (password) {
 520                 char *user_buf;
 521
 522                 len = password - url->auth;
 523                 if (len > 256) {
 524                         err = -EINVAL;
 525                         goto fail_buf;
 526                 }
 527
 528                 user_buf = alloca(len + 1);
 529                 if (!user_buf) {
 530                         err = -ENOMEM;
 531                         goto fail_buf;
 532                 }
 533
 534                 strncpy(user_buf, url->auth, len);
 535                 user_buf[len] = 0;
 536                 user = user_buf;
 537                 password++;
 538         } else {
 539                 user = url->auth;
 540                 password = "";
 541         }
 542
 543         http_digest_calculate_auth_hash(ahash, user, realm, password);
 544         http_digest_calculate_response(hash, &data);
 545
 546         buf = NULL;
 547         len = 0;
 548         ofs = 0;
 549
 550         add_field(&buf, &ofs, &len, "username", user);
 551         add_field(&buf, &ofs, &len, "realm", realm);
 552         add_field(&buf, &ofs, &len, "nonce", data.nonce);
 553         add_field(&buf, &ofs, &len, "uri", data.uri);
 554         add_field(&buf, &ofs, &len, "cnonce", data.cnonce);
 555         add_field(&buf, &ofs, &len, "response", hash);
 556         if (opaque)
 557                 add_field(&buf, &ofs, &len, "opaque", opaque);
 558
 559         ustream_printf(uh->us, "Authorization: Digest nc=%s, qop=%s%s\r\n", data.nc, data.qop, buf);
 560
 561         free(buf);
 562
 563         return 0;
 564
 565 fail_buf:
 566         free(buf_orig);
 567 fail:
 568         return err;
 569 }
 570
 571 static void
 572 uclient_http_add_auth_header(struct uclient_http *uh)
 573 {
 574         if (!uh->uc.url->auth)
 575                 return;
 576
 577         switch (uh->auth_type) {
 578         case AUTH_TYPE_UNKNOWN:
 579         case AUTH_TYPE_NONE:
 580                 break;
 581         case AUTH_TYPE_BASIC:
 582                 uclient_http_add_auth_basic(uh);
 583                 break;
 584         case AUTH_TYPE_DIGEST:
 585                 uclient_http_add_auth_digest(uh);
 586                 break;
 587         }
 588 }
 589
 590 static void
 591 uclient_http_send_headers(struct uclient_http *uh)
 592 {
 593         struct uclient_url *url = uh->uc.url;
 594         struct blob_attr *cur;
 595         enum request_type req_type = uh->req_type;
 596         bool literal_ipv6;
 597         int rem;
 598
 599         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 600                 return;
 601
 602         if (uh->uc.proxy_url)
 603                 url = uh->uc.proxy_url;
 604
 605         literal_ipv6 = strchr(url->host, ':');
 606
 607         ustream_printf(uh->us,
 608                 "%s %s HTTP/1.1\r\n"
 609                 "Host: %s%s%s%s%s\r\n",
 610                 request_types[req_type], url->location,
 611                 literal_ipv6 ? "[" : "",
 612                 url->host,
 613                 literal_ipv6 ? "]" : "",
 614                 url->port ? ":" : "",
 615                 url->port ? url->port : "");
 616
 617         blobmsg_for_each_attr(cur, uh->headers.head, rem)
 618                 ustream_printf(uh->us, "%s: %s\r\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
 619
 620         if (uclient_request_supports_body(uh->req_type))
 621                 ustream_printf(uh->us, "Transfer-Encoding: chunked\r\n");
 622
 623         uclient_http_add_auth_header(uh);
 624
 625         ustream_printf(uh->us, "\r\n");
 626
 627         uh->state = HTTP_STATE_HEADERS_SENT;
 628 }
 629
 630 static void uclient_http_headers_complete(struct uclient_http *uh)
 631 {
 632         enum auth_type auth_type = uh->auth_type;
 633         int seq = uh->uc.seq;
 634
 635         uh->state = HTTP_STATE_RECV_DATA;
 636         uh->uc.meta = uh->meta.head;
 637         uclient_http_process_headers(uh);
 638
 639         if (auth_type == AUTH_TYPE_UNKNOWN && uh->uc.status_code == 401 &&
 640             (uh->req_type == REQ_HEAD || uh->req_type == REQ_GET)) {
 641                 uclient_http_connect(&uh->uc);
 642                 uclient_http_send_headers(uh);
 643                 uh->state = HTTP_STATE_REQUEST_DONE;
 644                 return;
 645         }
 646
 647         if (uh->uc.cb->header_done)
 648                 uh->uc.cb->header_done(&uh->uc);
 649
 650         if (uh->eof || seq != uh->uc.seq)
 651                 return;
 652
 653         if (uh->req_type == REQ_HEAD || uh->uc.status_code == 204) {
 654                 uh->eof = true;
 655                 uclient_notify_eof(uh);
 656         }
 657 }
 658
 659 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
 660 {
 661         char *name;
 662         char *sep;
 663
 664         if (uh->state == HTTP_STATE_REQUEST_DONE) {
 665                 char *code;
 666
 667                 if (!strlen(data))
 668                         return;
 669
 670                 /* HTTP/1.1 */
 671                 strsep(&data, " ");
 672
 673                 code = strsep(&data, " ");
 674                 if (!code)
 675                         goto error;
 676
 677                 uh->uc.status_code = strtoul(code, &sep, 10);
 678                 if (sep && *sep)
 679                         goto error;
 680
 681                 uh->state = HTTP_STATE_RECV_HEADERS;
 682                 return;
 683         }
 684
 685         if (!*data) {
 686                 uclient_http_headers_complete(uh);
 687                 return;
 688         }
 689
 690         sep = strchr(data, ':');
 691         if (!sep)
 692                 return;
 693
 694         *(sep++) = 0;
 695
 696         for (name = data; *name; name++)
 697                 *name = tolower(*name);
 698
 699         name = data;
 700         while (isspace(*sep))
 701                 sep++;
 702
 703         blobmsg_add_string(&uh->meta, name, sep);
 704         return;
 705
 706 error:
 707         uh->uc.status_code = 400;
 708         uh->eof = true;
 709         uclient_notify_eof(uh);
 710 }
 711
 712 static void __uclient_notify_read(struct uclient_http *uh)
 713 {
 714         struct uclient *uc = &uh->uc;
 715         unsigned int seq = uh->seq;
 716         char *data;
 717         int len;
 718
 719         if (uh->state < HTTP_STATE_REQUEST_DONE || uh->state == HTTP_STATE_ERROR)
 720                 return;
 721
 722         data = ustream_get_read_buf(uh->us, &len);
 723         if (!data || !len)
 724                 return;
 725
 726         if (uh->state < HTTP_STATE_RECV_DATA) {
 727                 char *sep, *next;
 728                 int cur_len;
 729
 730                 do {
 731                         sep = strchr(data, '\n');
 732                         if (!sep)
 733                                 break;
 734
 735                         next = sep + 1;
 736                         if (sep > data && sep[-1] == '\r')
 737                                 sep--;
 738
 739                         /* Check for multi-line HTTP headers */
 740                         if (sep > data) {
 741                                 if (!*next)
 742                                         return;
 743
 744                                 if (isspace(*next) && *next != '\r' && *next != '\n') {
 745                                         sep[0] = ' ';
 746                                         if (sep + 1 < next)
 747                                                 sep[1] = ' ';
 748                                         continue;
 749                                 }
 750                         }
 751
 752                         *sep = 0;
 753                         cur_len = next - data;
 754                         uclient_parse_http_line(uh, data);
 755                         if (seq != uh->seq)
 756                                 return;
 757
 758                         ustream_consume(uh->us, cur_len);
 759                         len -= cur_len;
 760
 761                         if (uh->eof)
 762                                 return;
 763
 764                         data = ustream_get_read_buf(uh->us, &len);
 765                 } while (data && uh->state < HTTP_STATE_RECV_DATA);
 766
 767                 if (!len)
 768                         return;
 769         }
 770
 771         if (uh->eof)
 772                 return;
 773
 774         if (uh->state == HTTP_STATE_RECV_DATA) {
 775                 /* Now it's uclient user turn to read some data */
 776                 uloop_timeout_cancel(&uc->connection_timeout);
 777
 778                 if (uc->cb->data_read)
 779                         uc->cb->data_read(uc);
 780         }
 781 }
 782
 783 static void __uclient_notify_write(struct uclient_http *uh)
 784 {
 785         struct uclient *uc = &uh->uc;
 786
 787         if (uc->cb->data_sent)
 788                 uc->cb->data_sent(uc);
 789 }
 790
 791 static void uclient_notify_read(struct ustream *us, int bytes)
 792 {
 793         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 794
 795         __uclient_notify_read(uh);
 796 }
 797
 798 static void uclient_notify_write(struct ustream *us, int bytes)
 799 {
 800         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 801
 802         __uclient_notify_write(uh);
 803 }
 804
 805 static void uclient_notify_state(struct ustream *us)
 806 {
 807         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 808
 809         if (uh->ufd.stream.write_error) {
 810                 uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 811                 return;
 812         }
 813         uclient_notify_eof(uh);
 814 }
 815
 816 static int uclient_setup_http(struct uclient_http *uh)
 817 {
 818         struct ustream *us = &uh->ufd.stream;
 819         int ret;
 820
 821         uh->us = us;
 822         uh->ssl = false;
 823
 824         us->string_data = true;
 825         us->notify_state = uclient_notify_state;
 826         us->notify_read = uclient_notify_read;
 827         us->notify_write = uclient_notify_write;
 828
 829         ret = uclient_do_connect(uh, "80");
 830         if (ret)
 831                 return UCLIENT_ERROR_CONNECT;
 832
 833         return 0;
 834 }
 835
 836 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
 837 {
 838         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 839
 840         __uclient_notify_read(uh);
 841 }
 842
 843 static void uclient_ssl_notify_write(struct ustream *us, int bytes)
 844 {
 845         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 846
 847         __uclient_notify_write(uh);
 848 }
 849
 850 static void uclient_ssl_notify_state(struct ustream *us)
 851 {
 852         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 853
 854         uclient_notify_eof(uh);
 855 }
 856
 857 static void uclient_ssl_notify_error(struct ustream_ssl *ssl, int error, const char *str)
 858 {
 859         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 860
 861         uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 862 }
 863
 864 static void uclient_ssl_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
 865 {
 866         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 867
 868         if (!uh->ssl_require_validation)
 869                 return;
 870
 871         uclient_http_error(uh, UCLIENT_ERROR_SSL_INVALID_CERT);
 872 }
 873
 874 static void uclient_ssl_notify_connected(struct ustream_ssl *ssl)
 875 {
 876         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 877
 878         if (!uh->ssl_require_validation)
 879                 return;
 880
 881         if (!uh->ussl.valid_cn)
 882                 uclient_http_error(uh, UCLIENT_ERROR_SSL_CN_MISMATCH);
 883 }
 884
 885 static int uclient_setup_https(struct uclient_http *uh)
 886 {
 887         struct ustream *us = &uh->ussl.stream;
 888         int ret;
 889
 890         uh->ssl = true;
 891         uh->us = us;
 892
 893         if (!uh->ssl_ctx)
 894                 return UCLIENT_ERROR_MISSING_SSL_CONTEXT;
 895
 896         ret = uclient_do_connect(uh, "443");
 897         if (ret)
 898                 return UCLIENT_ERROR_CONNECT;
 899
 900         us->string_data = true;
 901         us->notify_state = uclient_ssl_notify_state;
 902         us->notify_read = uclient_ssl_notify_read;
 903         us->notify_write = uclient_ssl_notify_write;
 904         uh->ussl.notify_error = uclient_ssl_notify_error;
 905         uh->ussl.notify_verify_error = uclient_ssl_notify_verify_error;
 906         uh->ussl.notify_connected = uclient_ssl_notify_connected;
 907         uh->ussl.server_name = uh->uc.url->host;
 908         uh->ssl_ops->init(&uh->ussl, &uh->ufd.stream, uh->ssl_ctx, false);
 909         uh->ssl_ops->set_peer_cn(&uh->ussl, uh->uc.url->host);
 910
 911         return 0;
 912 }
 913
 914 static int uclient_http_connect(struct uclient *cl)
 915 {
 916         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 917         int ret;
 918
 919         if (!cl->eof || uh->disconnect || uh->connection_close)
 920                 uclient_http_disconnect(uh);
 921
 922         uclient_http_init_request(uh);
 923
 924         if (uh->us)
 925                 return 0;
 926
 927         uh->ssl = cl->url->prefix == PREFIX_HTTPS;
 928
 929         if (uh->ssl)
 930                 ret = uclient_setup_https(uh);
 931         else
 932                 ret = uclient_setup_http(uh);
 933
 934         return ret;
 935 }
 936
 937 static void uclient_http_disconnect_cb(struct uloop_timeout *timeout)
 938 {
 939         struct uclient_http *uh = container_of(timeout, struct uclient_http, disconnect_t);
 940
 941         uclient_http_disconnect(uh);
 942 }
 943
 944 static struct uclient *uclient_http_alloc(void)
 945 {
 946         struct uclient_http *uh;
 947
 948         uh = calloc_a(sizeof(*uh));
 949         if (!uh)
 950                 return NULL;
 951
 952         uh->disconnect_t.cb = uclient_http_disconnect_cb;
 953         blob_buf_init(&uh->headers, 0);
 954
 955         return &uh->uc;
 956 }
 957
 958 static void uclient_http_free_ssl_ctx(struct uclient_http *uh)
 959 {
 960         uh->ssl_ops = NULL;
 961         uh->ssl_ctx = NULL;
 962 }
 963
 964 static void uclient_http_free(struct uclient *cl)
 965 {
 966         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 967
 968         uclient_http_free_url_state(cl);
 969         uclient_http_free_ssl_ctx(uh);
 970         blob_buf_free(&uh->headers);
 971         blob_buf_free(&uh->meta);
 972         free(uh);
 973 }
 974
 975 int
 976 uclient_http_set_request_type(struct uclient *cl, const char *type)
 977 {
 978         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 979         int i;
 980
 981         if (cl->backend != &uclient_backend_http)
 982                 return -1;
 983
 984         if (uh->state > HTTP_STATE_INIT)
 985                 return -1;
 986
 987         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
 988                 if (strcmp(request_types[i], type) != 0)
 989                         continue;
 990
 991                 uh->req_type = i;
 992                 return 0;
 993         }
 994
 995         return -1;
 996 }
 997
 998 int
 999 uclient_http_reset_headers(struct uclient *cl)
1000 {
1001         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1002
1003         blob_buf_init(&uh->headers, 0);
1004
1005         return 0;
1006 }
1007
1008 int
1009 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
1010 {
1011         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1012
1013         if (cl->backend != &uclient_backend_http)
1014                 return -1;
1015
1016         if (uh->state > HTTP_STATE_INIT)
1017                 return -1;
1018
1019         blobmsg_add_string(&uh->headers, name, value);
1020         return 0;
1021 }
1022
1023 static int
1024 uclient_http_send_data(struct uclient *cl, const char *buf, unsigned int len)
1025 {
1026         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1027
1028         if (uh->state >= HTTP_STATE_REQUEST_DONE)
1029                 return -1;
1030
1031         uclient_http_send_headers(uh);
1032
1033         if (len > 0) {
1034                 ustream_printf(uh->us, "%X\r\n", len);
1035                 ustream_write(uh->us, buf, len, false);
1036                 ustream_printf(uh->us, "\r\n");
1037         }
1038
1039         return len;
1040 }
1041
1042 static int
1043 uclient_http_request_done(struct uclient *cl)
1044 {
1045         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1046
1047         if (uh->state >= HTTP_STATE_REQUEST_DONE)
1048                 return -1;
1049
1050         uclient_http_send_headers(uh);
1051         if (uclient_request_supports_body(uh->req_type))
1052                 ustream_printf(uh->us, "0\r\n\r\n");
1053         uh->state = HTTP_STATE_REQUEST_DONE;
1054
1055         return 0;
1056 }
1057
1058 static int
1059 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
1060 {
1061         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1062         int read_len = 0;
1063         char *data, *data_end;
1064
1065         if (uh->state < HTTP_STATE_RECV_DATA || !uh->us)
1066                 return 0;
1067
1068         data = ustream_get_read_buf(uh->us, &read_len);
1069         if (!data || !read_len)
1070                 return 0;
1071
1072         data_end = data + read_len;
1073         read_len = 0;
1074
1075         if (uh->read_chunked == 0) {
1076                 char *sep;
1077
1078                 if (data[0] == '\r' && data[1] == '\n') {
1079                         data += 2;
1080                         read_len += 2;
1081                 }
1082
1083                 sep = strstr(data, "\r\n");
1084                 if (!sep)
1085                         return 0;
1086
1087                 *sep = 0;
1088                 uh->read_chunked = strtoul(data, NULL, 16);
1089
1090                 read_len += sep + 2 - data;
1091                 data = sep + 2;
1092
1093                 if (!uh->read_chunked) {
1094                         uh->eof = true;
1095                         uh->uc.data_eof = true;
1096                 }
1097         }
1098
1099         if (len > data_end - data)
1100                 len = data_end - data;
1101
1102         if (uh->read_chunked >= 0) {
1103                 if (len > uh->read_chunked)
1104                         len = uh->read_chunked;
1105
1106                 uh->read_chunked -= len;
1107         } else if (uh->content_length >= 0) {
1108                 if (len > uh->content_length)
1109                         len = uh->content_length;
1110
1111                 uh->content_length -= len;
1112                 if (!uh->content_length) {
1113                         uh->eof = true;
1114                         uh->uc.data_eof = true;
1115                 }
1116         }
1117
1118         if (len > 0) {
1119                 read_len += len;
1120                 memcpy(buf, data, len);
1121         }
1122
1123         if (read_len > 0)
1124                 ustream_consume(uh->us, read_len);
1125
1126         uclient_notify_eof(uh);
1127
1128         /* Now that we consumed something and if this isn't EOF, start timer again */
1129         if (!uh->uc.eof && !cl->connection_timeout.pending)
1130                 uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
1131
1132         return len;
1133 }
1134
1135 int uclient_http_redirect(struct uclient *cl)
1136 {
1137         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1138         struct blobmsg_policy location = {
1139                 .name = "location",
1140                 .type = BLOBMSG_TYPE_STRING,
1141         };
1142         struct uclient_url *url = cl->url;
1143         struct blob_attr *tb;
1144
1145         if (cl->backend != &uclient_backend_http)
1146                 return false;
1147
1148         switch (cl->status_code) {
1149         case 301:
1150         case 302:
1151         case 307:
1152                 break;
1153         default:
1154                 return false;
1155         }
1156
1157         blobmsg_parse(&location, 1, &tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
1158         if (!tb)
1159                 return false;
1160
1161         url = uclient_get_url_location(url, blobmsg_data(tb));
1162         if (!url)
1163                 return false;
1164
1165         free(cl->url);
1166         cl->url = url;
1167         if (uclient_http_connect(cl))
1168                 return -1;
1169
1170         uclient_http_request_done(cl);
1171
1172         return true;
1173 }
1174
1175 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
1176                              struct ustream_ssl_ctx *ctx, bool require_validation)
1177 {
1178         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1179
1180         if (cl->backend != &uclient_backend_http)
1181                 return -1;
1182
1183         uclient_http_free_url_state(cl);
1184
1185         uclient_http_free_ssl_ctx(uh);
1186         uh->ssl_ops = ops;
1187         uh->ssl_ctx = ctx;
1188         uh->ssl_require_validation = !!ctx && require_validation;
1189
1190         return 0;
1191 }
1192
1193 int uclient_http_set_address_family(struct uclient *cl, int af)
1194 {
1195         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1196
1197         if (cl->backend != &uclient_backend_http)
1198                 return -1;
1199
1200         switch (af) {
1201         case AF_INET:
1202                 uh->usock_flags = USOCK_IPV4ONLY;
1203                 break;
1204         case AF_INET6:
1205                 uh->usock_flags = USOCK_IPV6ONLY;
1206                 break;
1207         default:
1208                 uh->usock_flags = 0;
1209                 break;
1210         }
1211
1212         return 0;
1213 }
1214
1215 const struct uclient_backend uclient_backend_http = {
1216         .prefix = uclient_http_prefix,
1217
1218         .alloc = uclient_http_alloc,
1219         .free = uclient_http_free,
1220         .connect = uclient_http_connect,
1221         .disconnect = uclient_http_request_disconnect,
1222         .update_url = uclient_http_free_url_state,
1223         .update_proxy_url = uclient_http_free_url_state,
1224
1225         .read = uclient_http_read,
1226         .write = uclient_http_send_data,
1227         .request = uclient_http_request_done,
1228 };