OVMS3-idf/examples/protocols/http2_request/components/sh2lib/connectlib.c
Kedar Sovani 3ace8416b5 [examples] Create HTTP2 example with http2.golang.org
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
2017-11-06 09:43:03 +05:30

164 lines
4.4 KiB
C

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