Intention is to partition the demo into multiple files, so that the main program is quite easy to follow. 1. connectlib.c: For any URL parsing and TCP connection related stuff 2. sh2lib.c: Convenience functions for HTTP2+TLS. The goal here is to expose a simpler API than nghttp2. If most usecases end up being served with this library, it could potentially be moved into a separate component
164 lines
4.4 KiB
C
164 lines
4.4 KiB
C
/* With adaptations by Espressif Systems
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*
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* Copyright (c) 2013 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <netdb.h>
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#include "connectlib.h"
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/* Basic parser from nghttp2/examples/client.c */
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int parse_uri(struct uri *res, const char *uri)
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{
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/* We only interested in https */
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size_t len, i, offset;
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int ipv6addr = 0;
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memset(res, 0, sizeof(struct uri));
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len = strlen(uri);
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if (len < 9 || memcmp("https://", uri, 8) != 0) {
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return -1;
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}
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offset = 8;
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res->host = res->hostport = &uri[offset];
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res->hostlen = 0;
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if (uri[offset] == '[') {
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/* IPv6 literal address */
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++offset;
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++res->host;
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ipv6addr = 1;
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for (i = offset; i < len; ++i) {
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if (uri[i] == ']') {
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res->hostlen = i - offset;
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offset = i + 1;
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break;
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}
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}
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} else {
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const char delims[] = ":/?#";
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for (i = offset; i < len; ++i) {
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if (strchr(delims, uri[i]) != NULL) {
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break;
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}
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}
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res->hostlen = i - offset;
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offset = i;
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}
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if (res->hostlen == 0) {
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return -1;
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}
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/* Assuming https */
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res->port = 443;
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if (offset < len) {
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if (uri[offset] == ':') {
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/* port */
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const char delims[] = "/?#";
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int port = 0;
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++offset;
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for (i = offset; i < len; ++i) {
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if (strchr(delims, uri[i]) != NULL) {
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break;
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}
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if ('0' <= uri[i] && uri[i] <= '9') {
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port *= 10;
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port += uri[i] - '0';
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if (port > 65535) {
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return -1;
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}
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} else {
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return -1;
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}
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}
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if (port == 0) {
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return -1;
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}
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offset = i;
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res->port = (uint16_t)port;
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}
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}
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res->hostportlen = (size_t)(uri + offset + ipv6addr - res->host);
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for (i = offset; i < len; ++i) {
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if (uri[i] == '#') {
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break;
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}
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}
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if (i - offset == 0) {
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res->path = "/";
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res->pathlen = 1;
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} else {
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res->path = &uri[offset];
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res->pathlen = i - offset;
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}
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return 0;
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}
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int connect_to_host(const char *host, size_t hostlen, uint16_t port)
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{
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int ret;
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struct addrinfo hints = {
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.ai_family = AF_UNSPEC,
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.ai_socktype = SOCK_STREAM,
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};
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char service[6];
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snprintf(service, sizeof(service), "%u", port);
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char *use_host = calloc(1, hostlen + 1);
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if (!use_host) {
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return -1;
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}
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strncpy(use_host, host, hostlen);
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struct addrinfo *res;
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ret = getaddrinfo(use_host, service, &hints, &res);
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if (ret) {
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free(use_host);
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return -1;
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}
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free(use_host);
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ret = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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if (ret < 0) {
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goto err_freeaddr;
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}
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int fd = ret;
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ret = connect(fd, res->ai_addr, res->ai_addrlen);
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if (ret < 0) {
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goto err_freesocket;
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}
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return fd;
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err_freesocket:
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close(fd);
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err_freeaddr:
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freeaddrinfo(res);
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return -1;
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}
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