2 * uclient - ustream based protocol client library
4 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
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.
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.
18 #include <sys/socket.h>
25 #include <libubox/ustream.h>
26 #include <libubox/ustream-ssl.h>
27 #include <libubox/usock.h>
28 #include <libubox/blobmsg.h>
31 #include "uclient-utils.h"
32 #include "uclient-backend.h"
52 HTTP_STATE_HEADERS_SENT,
53 HTTP_STATE_REQUEST_DONE,
54 HTTP_STATE_RECV_HEADERS,
59 static const char * const request_types[__REQ_MAX] = {
64 [REQ_DELETE] = "DELETE",
70 const struct ustream_ssl_ops *ssl_ops;
71 struct ustream_ssl_ctx *ssl_ctx;
74 struct ustream_fd ufd;
75 struct ustream_ssl ussl;
77 struct uloop_timeout disconnect_t;
80 bool ssl_require_validation;
83 bool connection_close;
85 enum request_type req_type;
86 enum http_state state;
88 enum auth_type auth_type;
98 struct blob_buf headers;
108 static const char * const uclient_http_prefix[] = {
109 [PREFIX_HTTP] = "http://",
110 [PREFIX_HTTPS] = "https://",
111 [__PREFIX_MAX] = NULL
114 static int uclient_http_connect(struct uclient *cl);
116 static int uclient_do_connect(struct uclient_http *uh, const char *port)
121 if (uh->uc.url->port)
122 port = uh->uc.url->port;
124 memset(&uh->uc.remote_addr, 0, sizeof(uh->uc.remote_addr));
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);
132 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
133 ustream_fd_init(&uh->ufd, fd);
135 sl = sizeof(uh->uc.local_addr);
136 memset(&uh->uc.local_addr, 0, sl);
137 getsockname(fd, &uh->uc.local_addr.sa, &sl);
142 static void uclient_http_disconnect(struct uclient_http *uh)
144 uloop_timeout_cancel(&uh->disconnect_t);
149 ustream_free(&uh->ussl.stream);
150 ustream_free(&uh->ufd.stream);
151 close(uh->ufd.fd.fd);
155 static void uclient_http_free_url_state(struct uclient *cl)
157 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
159 uh->auth_type = AUTH_TYPE_UNKNOWN;
162 uclient_http_disconnect(uh);
165 static void uclient_http_error(struct uclient_http *uh, int code)
167 uh->state = HTTP_STATE_ERROR;
169 ustream_state_change(uh->us);
170 uclient_backend_set_error(&uh->uc, code);
173 static void uclient_http_request_disconnect(struct uclient *cl)
175 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
181 uh->disconnect = true;
182 uloop_timeout_set(&uh->disconnect_t, 1);
185 static void uclient_notify_eof(struct uclient_http *uh)
187 struct ustream *us = uh->us;
193 if (!us->eof && !us->write_error)
196 if (ustream_pending_data(us, false))
200 if (uh->content_length < 0 && uh->read_chunked >= 0)
201 uh->uc.data_eof = true;
203 uclient_backend_set_eof(&uh->uc);
205 if (uh->connection_close)
206 uclient_http_request_disconnect(&uh->uc);
209 static void uclient_http_reset_state(struct uclient_http *uh)
212 uclient_backend_reset_state(&uh->uc);
213 uh->read_chunked = -1;
214 uh->content_length = -1;
216 uh->disconnect = false;
217 uh->connection_close = false;
218 uh->state = HTTP_STATE_INIT;
220 if (uh->auth_type == AUTH_TYPE_UNKNOWN && !uh->uc.url->auth)
221 uh->auth_type = AUTH_TYPE_NONE;
224 static void uclient_http_init_request(struct uclient_http *uh)
227 uclient_http_reset_state(uh);
228 blob_buf_init(&uh->meta, 0);
231 static enum auth_type
232 uclient_http_update_auth_type(struct uclient_http *uh)
235 return AUTH_TYPE_NONE;
237 if (!strncasecmp(uh->auth_str, "basic", 5))
238 return AUTH_TYPE_BASIC;
240 if (!strncasecmp(uh->auth_str, "digest", 6))
241 return AUTH_TYPE_DIGEST;
243 return AUTH_TYPE_NONE;
246 static void uclient_http_process_headers(struct uclient_http *uh)
249 HTTP_HDR_TRANSFER_ENCODING,
251 HTTP_HDR_CONTENT_LENGTH,
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"),
263 struct blob_attr *tb[__HTTP_HDR_MAX];
264 struct blob_attr *cur;
266 blobmsg_parse(hdr_policy, __HTTP_HDR_MAX, tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
268 cur = tb[HTTP_HDR_TRANSFER_ENCODING];
269 if (cur && strstr(blobmsg_data(cur), "chunked"))
270 uh->read_chunked = 0;
272 cur = tb[HTTP_HDR_CONNECTION];
273 if (cur && strstr(blobmsg_data(cur), "close"))
274 uh->connection_close = true;
276 cur = tb[HTTP_HDR_CONTENT_LENGTH];
278 uh->content_length = strtoul(blobmsg_data(cur), NULL, 10);
280 cur = tb[HTTP_HDR_AUTH];
283 uh->auth_str = strdup(blobmsg_data(cur));
286 uh->auth_type = uclient_http_update_auth_type(uh);
289 static bool uclient_request_supports_body(enum request_type req_type)
302 uclient_http_add_auth_basic(struct uclient_http *uh)
304 struct uclient_url *url = uh->uc.url;
305 int auth_len = strlen(url->auth);
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);
316 static char *digest_unquote_sep(char **str)
318 char *cur = *str + 1;
350 static char *digest_sep(char **str)
355 next = strchr(*str, ',');
360 *str += strlen(*str);
366 static bool strmatch(char **str, const char *prefix)
368 int len = strlen(prefix);
370 if (strncmp(*str, prefix, len) != 0 || (*str)[len] != '=')
378 get_cnonce(char *dest)
384 f = fopen("/dev/urandom", "r");
386 n = fread(&val, sizeof(val), 1, f);
392 bin_to_hex(dest, &val, sizeof(val));
395 static void add_field(char **buf, int *ofs, int *len, const char *name, const char *val)
397 int available = *len - *ofs;
405 required = strlen(name) + 4 + strlen(val) * 2;
406 if (required > available)
407 *len += required - available + 64;
409 *buf = realloc(*buf, *len);
414 cur += sprintf(cur, ", %s=\"", name);
416 while ((next = strchr(val, '"'))) {
418 memcpy(cur, val, next - val);
422 cur += sprintf(cur, "\\\"");
426 cur += sprintf(cur, "%s\"", val);
431 uclient_http_add_auth_digest(struct uclient_http *uh)
433 struct uclient_url *url = uh->uc.url;
434 const char *realm = NULL, *opaque = NULL;
435 const char *user, *password;
444 struct http_digest_data data = {
446 .cnonce = cnonce_str,
450 len = strlen(uh->auth_str) + 1;
455 strcpy(buf, uh->auth_str);
462 const char **dest = NULL;
465 while (*next && isspace(*next))
468 if (strmatch(&next, "realm"))
470 else if (strmatch(&next, "qop"))
472 else if (strmatch(&next, "nonce"))
474 else if (strmatch(&next, "opaque"))
476 else if (strmatch(&next, "stale") ||
477 strmatch(&next, "algorithm") ||
478 strmatch(&next, "auth-param")) {
481 } else if (strmatch(&next, "domain") ||
482 strmatch(&next, "qop-options"))
489 *dest = digest_unquote_sep(&next);
492 if (!realm || !data.qop || !data.nonce)
495 sprintf(nc_str, "%08x", uh->nc++);
496 get_cnonce(cnonce_str);
499 data.uri = url->location;
500 data.method = request_types[uh->req_type];
502 password = strchr(url->auth, ':');
506 len = password - url->auth;
510 user_buf = alloca(len + 1);
511 strncpy(user_buf, url->auth, len);
520 http_digest_calculate_auth_hash(ahash, user, realm, password);
521 http_digest_calculate_response(hash, &data);
527 add_field(&buf, &ofs, &len, "username", user);
528 add_field(&buf, &ofs, &len, "realm", realm);
529 add_field(&buf, &ofs, &len, "nonce", data.nonce);
530 add_field(&buf, &ofs, &len, "uri", data.uri);
531 add_field(&buf, &ofs, &len, "cnonce", data.cnonce);
532 add_field(&buf, &ofs, &len, "response", hash);
534 add_field(&buf, &ofs, &len, "opaque", opaque);
536 ustream_printf(uh->us, "Authorization: Digest nc=%s, qop=%s%s\r\n", data.nc, data.qop, buf);
541 uclient_http_add_auth_header(struct uclient_http *uh)
543 if (!uh->uc.url->auth)
546 switch (uh->auth_type) {
547 case AUTH_TYPE_UNKNOWN:
550 case AUTH_TYPE_BASIC:
551 uclient_http_add_auth_basic(uh);
553 case AUTH_TYPE_DIGEST:
554 uclient_http_add_auth_digest(uh);
560 uclient_http_send_headers(struct uclient_http *uh)
562 struct uclient_url *url = uh->uc.url;
563 struct blob_attr *cur;
564 enum request_type req_type = uh->req_type;
567 if (uh->state >= HTTP_STATE_HEADERS_SENT)
570 if (uh->uc.proxy_url)
571 url = uh->uc.proxy_url;
573 ustream_printf(uh->us,
576 request_types[req_type],
577 url->location, url->host,
578 url->port ? ":" : "",
579 url->port ? url->port : "");
581 blobmsg_for_each_attr(cur, uh->headers.head, rem)
582 ustream_printf(uh->us, "%s: %s\r\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
584 if (uclient_request_supports_body(uh->req_type))
585 ustream_printf(uh->us, "Transfer-Encoding: chunked\r\n");
587 uclient_http_add_auth_header(uh);
589 ustream_printf(uh->us, "\r\n");
591 uh->state = HTTP_STATE_HEADERS_SENT;
594 static void uclient_http_headers_complete(struct uclient_http *uh)
596 enum auth_type auth_type = uh->auth_type;
597 int seq = uh->uc.seq;
599 uh->state = HTTP_STATE_RECV_DATA;
600 uh->uc.meta = uh->meta.head;
601 uclient_http_process_headers(uh);
603 if (auth_type == AUTH_TYPE_UNKNOWN && uh->uc.status_code == 401 &&
604 (uh->req_type == REQ_HEAD || uh->req_type == REQ_GET)) {
605 uclient_http_connect(&uh->uc);
606 uclient_http_send_headers(uh);
607 uh->state = HTTP_STATE_REQUEST_DONE;
611 if (uh->uc.cb->header_done)
612 uh->uc.cb->header_done(&uh->uc);
614 if (uh->eof || seq != uh->uc.seq)
617 if (uh->req_type == REQ_HEAD || uh->uc.status_code == 204) {
619 uclient_notify_eof(uh);
623 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
628 if (uh->state == HTTP_STATE_REQUEST_DONE) {
637 code = strsep(&data, " ");
641 uh->uc.status_code = strtoul(code, &sep, 10);
645 uh->state = HTTP_STATE_RECV_HEADERS;
650 uclient_http_headers_complete(uh);
654 sep = strchr(data, ':');
660 for (name = data; *name; name++)
661 *name = tolower(*name);
664 while (isspace(*sep))
667 blobmsg_add_string(&uh->meta, name, sep);
671 uh->uc.status_code = 400;
673 uclient_notify_eof(uh);
676 static void __uclient_notify_read(struct uclient_http *uh)
678 struct uclient *uc = &uh->uc;
679 unsigned int seq = uh->seq;
683 if (uh->state < HTTP_STATE_REQUEST_DONE || uh->state == HTTP_STATE_ERROR)
686 data = ustream_get_read_buf(uh->us, &len);
690 if (uh->state < HTTP_STATE_RECV_DATA) {
695 sep = strchr(data, '\n');
700 if (sep > data && sep[-1] == '\r')
703 /* Check for multi-line HTTP headers */
708 if (isspace(*next) && *next != '\r' && *next != '\n') {
717 cur_len = next - data;
718 uclient_parse_http_line(uh, data);
722 ustream_consume(uh->us, cur_len);
728 data = ustream_get_read_buf(uh->us, &len);
729 } while (data && uh->state < HTTP_STATE_RECV_DATA);
738 if (uh->state == HTTP_STATE_RECV_DATA) {
739 /* Now it's uclient user turn to read some data */
740 uloop_timeout_cancel(&uc->connection_timeout);
742 if (uc->cb->data_read)
743 uc->cb->data_read(uc);
747 static void __uclient_notify_write(struct uclient_http *uh)
749 struct uclient *uc = &uh->uc;
751 if (uc->cb->data_sent)
752 uc->cb->data_sent(uc);
755 static void uclient_notify_read(struct ustream *us, int bytes)
757 struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
759 __uclient_notify_read(uh);
762 static void uclient_notify_write(struct ustream *us, int bytes)
764 struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
766 __uclient_notify_write(uh);
769 static void uclient_notify_state(struct ustream *us)
771 struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
773 if (uh->ufd.stream.write_error) {
774 uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
777 uclient_notify_eof(uh);
780 static int uclient_setup_http(struct uclient_http *uh)
782 struct ustream *us = &uh->ufd.stream;
788 us->string_data = true;
789 us->notify_state = uclient_notify_state;
790 us->notify_read = uclient_notify_read;
791 us->notify_write = uclient_notify_write;
793 ret = uclient_do_connect(uh, "80");
795 return UCLIENT_ERROR_CONNECT;
800 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
802 struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
804 __uclient_notify_read(uh);
807 static void uclient_ssl_notify_write(struct ustream *us, int bytes)
809 struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
811 __uclient_notify_write(uh);
814 static void uclient_ssl_notify_state(struct ustream *us)
816 struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
818 uclient_notify_eof(uh);
821 static void uclient_ssl_notify_error(struct ustream_ssl *ssl, int error, const char *str)
823 struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
825 uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
828 static void uclient_ssl_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
830 struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
832 if (!uh->ssl_require_validation)
835 uclient_http_error(uh, UCLIENT_ERROR_SSL_INVALID_CERT);
838 static void uclient_ssl_notify_connected(struct ustream_ssl *ssl)
840 struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
842 if (!uh->ssl_require_validation)
845 if (!uh->ussl.valid_cn)
846 uclient_http_error(uh, UCLIENT_ERROR_SSL_CN_MISMATCH);
849 static int uclient_setup_https(struct uclient_http *uh)
851 struct ustream *us = &uh->ussl.stream;
858 return UCLIENT_ERROR_MISSING_SSL_CONTEXT;
860 ret = uclient_do_connect(uh, "443");
862 return UCLIENT_ERROR_CONNECT;
864 us->string_data = true;
865 us->notify_state = uclient_ssl_notify_state;
866 us->notify_read = uclient_ssl_notify_read;
867 us->notify_write = uclient_ssl_notify_write;
868 uh->ussl.notify_error = uclient_ssl_notify_error;
869 uh->ussl.notify_verify_error = uclient_ssl_notify_verify_error;
870 uh->ussl.notify_connected = uclient_ssl_notify_connected;
871 uh->ussl.server_name = uh->uc.url->host;
872 uh->ssl_ops->init(&uh->ussl, &uh->ufd.stream, uh->ssl_ctx, false);
873 uh->ssl_ops->set_peer_cn(&uh->ussl, uh->uc.url->host);
878 static int uclient_http_connect(struct uclient *cl)
880 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
883 if (!cl->eof || uh->disconnect || uh->connection_close)
884 uclient_http_disconnect(uh);
886 uclient_http_init_request(uh);
891 uh->ssl = cl->url->prefix == PREFIX_HTTPS;
894 ret = uclient_setup_https(uh);
896 ret = uclient_setup_http(uh);
901 static void uclient_http_disconnect_cb(struct uloop_timeout *timeout)
903 struct uclient_http *uh = container_of(timeout, struct uclient_http, disconnect_t);
905 uclient_http_disconnect(uh);
908 static struct uclient *uclient_http_alloc(void)
910 struct uclient_http *uh;
912 uh = calloc_a(sizeof(*uh));
913 uh->disconnect_t.cb = uclient_http_disconnect_cb;
914 blob_buf_init(&uh->headers, 0);
919 static void uclient_http_free_ssl_ctx(struct uclient_http *uh)
925 static void uclient_http_free(struct uclient *cl)
927 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
929 uclient_http_free_url_state(cl);
930 uclient_http_free_ssl_ctx(uh);
931 blob_buf_free(&uh->headers);
932 blob_buf_free(&uh->meta);
937 uclient_http_set_request_type(struct uclient *cl, const char *type)
939 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
942 if (cl->backend != &uclient_backend_http)
945 if (uh->state > HTTP_STATE_INIT)
948 for (i = 0; i < ARRAY_SIZE(request_types); i++) {
949 if (strcmp(request_types[i], type) != 0)
960 uclient_http_reset_headers(struct uclient *cl)
962 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
964 blob_buf_init(&uh->headers, 0);
970 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
972 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
974 if (cl->backend != &uclient_backend_http)
977 if (uh->state > HTTP_STATE_INIT)
980 blobmsg_add_string(&uh->headers, name, value);
985 uclient_http_send_data(struct uclient *cl, const char *buf, unsigned int len)
987 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
989 if (uh->state >= HTTP_STATE_REQUEST_DONE)
992 uclient_http_send_headers(uh);
995 ustream_printf(uh->us, "%X\r\n", len);
996 ustream_write(uh->us, buf, len, false);
997 ustream_printf(uh->us, "\r\n");
1004 uclient_http_request_done(struct uclient *cl)
1006 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1008 if (uh->state >= HTTP_STATE_REQUEST_DONE)
1011 uclient_http_send_headers(uh);
1012 if (uclient_request_supports_body(uh->req_type))
1013 ustream_printf(uh->us, "0\r\n\r\n");
1014 uh->state = HTTP_STATE_REQUEST_DONE;
1020 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
1022 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1024 char *data, *data_end;
1026 if (uh->state < HTTP_STATE_RECV_DATA || !uh->us)
1029 data = ustream_get_read_buf(uh->us, &read_len);
1030 if (!data || !read_len)
1033 data_end = data + read_len;
1036 if (uh->read_chunked == 0) {
1039 if (data[0] == '\r' && data[1] == '\n') {
1044 sep = strstr(data, "\r\n");
1049 uh->read_chunked = strtoul(data, NULL, 16);
1051 read_len += sep + 2 - data;
1054 if (!uh->read_chunked) {
1056 uh->uc.data_eof = true;
1060 if (len > data_end - data)
1061 len = data_end - data;
1063 if (uh->read_chunked >= 0) {
1064 if (len > uh->read_chunked)
1065 len = uh->read_chunked;
1067 uh->read_chunked -= len;
1068 } else if (uh->content_length >= 0) {
1069 if (len > uh->content_length)
1070 len = uh->content_length;
1072 uh->content_length -= len;
1073 if (!uh->content_length) {
1075 uh->uc.data_eof = true;
1081 memcpy(buf, data, len);
1085 ustream_consume(uh->us, read_len);
1087 uclient_notify_eof(uh);
1089 /* Now that we consumed something and if this isn't EOF, start timer again */
1090 if (!uh->uc.eof && !cl->connection_timeout.pending)
1091 uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
1096 int uclient_http_redirect(struct uclient *cl)
1098 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1099 struct blobmsg_policy location = {
1101 .type = BLOBMSG_TYPE_STRING,
1103 struct uclient_url *url = cl->url;
1104 struct blob_attr *tb;
1106 if (cl->backend != &uclient_backend_http)
1109 switch (cl->status_code) {
1118 blobmsg_parse(&location, 1, &tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
1122 url = uclient_get_url_location(url, blobmsg_data(tb));
1128 if (uclient_http_connect(cl))
1131 uclient_http_request_done(cl);
1136 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
1137 struct ustream_ssl_ctx *ctx, bool require_validation)
1139 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1141 if (cl->backend != &uclient_backend_http)
1144 uclient_http_free_url_state(cl);
1146 uclient_http_free_ssl_ctx(uh);
1149 uh->ssl_require_validation = !!ctx && require_validation;
1154 int uclient_http_set_address_family(struct uclient *cl, int af)
1156 struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1158 if (cl->backend != &uclient_backend_http)
1163 uh->usock_flags = USOCK_IPV4ONLY;
1166 uh->usock_flags = USOCK_IPV6ONLY;
1169 uh->usock_flags = 0;
1176 const struct uclient_backend uclient_backend_http = {
1177 .prefix = uclient_http_prefix,
1179 .alloc = uclient_http_alloc,
1180 .free = uclient_http_free,
1181 .connect = uclient_http_connect,
1182 .disconnect = uclient_http_request_disconnect,
1183 .update_url = uclient_http_free_url_state,
1184 .update_proxy_url = uclient_http_free_url_state,
1186 .read = uclient_http_read,
1187 .write = uclient_http_send_data,
1188 .request = uclient_http_request_done,