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#include "libnetdata/libnetdata.h"
#include "https_client.h"
#include "../mqtt_websockets/c-rbuf/include/ringbuffer.h"
enum http_parse_state {
HTTP_PARSE_INITIAL = 0,
HTTP_PARSE_HEADERS,
HTTP_PARSE_CONTENT
};
typedef struct {
enum http_parse_state state;
int content_length;
int http_code;
} http_parse_ctx;
#define HTTP_PARSE_CTX_INITIALIZER { .state = HTTP_PARSE_INITIAL, .content_length = -1, .http_code = 0 }
#define NEED_MORE_DATA 0
#define PARSE_SUCCESS 1
#define PARSE_ERROR -1
#define HTTP_LINE_TERM "\x0D\x0A"
#define RESP_PROTO "HTTP/1.1 "
#define HTTP_KEYVAL_SEPARATOR ": "
#define HTTP_HDR_BUFFER_SIZE 256
#define PORT_STR_MAX_BYTES 7
static void process_http_hdr(http_parse_ctx *parse_ctx, const char *key, const char *val)
{
// currently we care only about content-length
// but in future the way this is written
// it can be extended
if (!strcmp("content-length", key)) {
parse_ctx->content_length = atoi(val);
}
}
static int parse_http_hdr(rbuf_t buf, http_parse_ctx *parse_ctx)
{
int idx, idx_end;
char buf_key[HTTP_HDR_BUFFER_SIZE];
char buf_val[HTTP_HDR_BUFFER_SIZE];
char *ptr = buf_key;
if (!rbuf_find_bytes(buf, HTTP_LINE_TERM, strlen(HTTP_LINE_TERM), &idx_end)) {
error("CRLF expected");
return 1;
}
char *separator = rbuf_find_bytes(buf, HTTP_KEYVAL_SEPARATOR, strlen(HTTP_KEYVAL_SEPARATOR), &idx);
if (!separator) {
error("Missing Key/Value separator");
return 1;
}
if (idx >= HTTP_HDR_BUFFER_SIZE) {
error("Key name is too long");
return 1;
}
rbuf_pop(buf, buf_key, idx);
buf_key[idx] = 0;
rbuf_bump_tail(buf, strlen(HTTP_KEYVAL_SEPARATOR));
idx_end -= strlen(HTTP_KEYVAL_SEPARATOR) + idx;
if (idx_end >= HTTP_HDR_BUFFER_SIZE) {
error("Value of key \"%s\" too long", buf_key);
return 1;
}
rbuf_pop(buf, buf_val, idx_end);
buf_val[idx_end] = 0;
rbuf_bump_tail(buf, strlen(HTTP_KEYVAL_SEPARATOR));
for (ptr = buf_key; *ptr; ptr++)
*ptr = tolower(*ptr);
process_http_hdr(parse_ctx, buf_key, buf_val);
return 0;
}
static int parse_http_response(rbuf_t buf, http_parse_ctx *parse_ctx)
{
int idx;
char rc[4];
do {
if (parse_ctx->state != HTTP_PARSE_CONTENT && !rbuf_find_bytes(buf, HTTP_LINE_TERM, strlen(HTTP_LINE_TERM), &idx))
return NEED_MORE_DATA;
switch (parse_ctx->state) {
case HTTP_PARSE_INITIAL:
if (rbuf_memcmp_n(buf, RESP_PROTO, strlen(RESP_PROTO))) {
error("Expected response to start with \"%s\"", RESP_PROTO);
return PARSE_ERROR;
}
rbuf_bump_tail(buf, strlen(RESP_PROTO));
if (rbuf_pop(buf, rc, 4) != 4) {
error("Expected HTTP status code");
return PARSE_ERROR;
}
if (rc[3] != ' ') {
error("Expected space after HTTP return code");
return PARSE_ERROR;
}
rc[3] = 0;
parse_ctx->http_code = atoi(rc);
if (parse_ctx->http_code < 100 || parse_ctx->http_code >= 600) {
error("HTTP code not in range 100 to 599");
return PARSE_ERROR;
}
rbuf_find_bytes(buf, HTTP_LINE_TERM, strlen(HTTP_LINE_TERM), &idx);
rbuf_bump_tail(buf, idx + strlen(HTTP_LINE_TERM));
parse_ctx->state = HTTP_PARSE_HEADERS;
break;
case HTTP_PARSE_HEADERS:
if (!idx) {
parse_ctx->state = HTTP_PARSE_CONTENT;
rbuf_bump_tail(buf, strlen(HTTP_LINE_TERM));
break;
}
if (parse_http_hdr(buf, parse_ctx))
return PARSE_ERROR;
rbuf_find_bytes(buf, HTTP_LINE_TERM, strlen(HTTP_LINE_TERM), &idx);
rbuf_bump_tail(buf, idx + strlen(HTTP_LINE_TERM));
break;
case HTTP_PARSE_CONTENT:
if (parse_ctx->content_length < 0) {
error("content-length missing and http headers ended");
return PARSE_ERROR;
}
if (rbuf_bytes_available(buf) >= (size_t)parse_ctx->content_length)
return PARSE_SUCCESS;
return NEED_MORE_DATA;
}
} while(1);
}
int https_request(http_req_type_t method, char *host, int port, char *url, char *b, size_t b_size, char *payload)
{
struct timeval timeout = { .tv_sec = 30, .tv_usec = 0 };
char sport[PORT_STR_MAX_BYTES];
size_t len = 0;
int rc = 1;
int ret;
char *ptr;
http_parse_ctx parse_ctx = HTTP_PARSE_CTX_INITIALIZER;
rbuf_t buffer = rbuf_create(b_size);
if (!buffer)
return 1;
snprintf(sport, PORT_STR_MAX_BYTES, "%d", port);
if (payload != NULL)
len = strlen(payload);
snprintf(
b,
b_size,
"%s %s HTTP/1.1\r\nHost: %s\r\nAccept: application/json\r\nContent-length: %zu\r\nAccept-Language: en-us\r\n"
"User-Agent: Netdata/rocks\r\n\r\n",
(method == HTTP_REQ_GET ? "GET" : "POST"), url, host, len);
if (payload != NULL)
strncat(b, payload, b_size - len);
len = strlen(b);
debug(D_ACLK, "Sending HTTPS req (%zu bytes): '%s'", len, b);
int sock = connect_to_this_ip46(IPPROTO_TCP, SOCK_STREAM, host, 0, sport, &timeout);
if (unlikely(sock == -1)) {
error("Handshake failed");
goto exit_buf;
}
SSL_CTX *ctx = security_initialize_openssl_client();
if (ctx==NULL) {
error("Cannot allocate SSL context");
goto exit_sock;
}
// Certificate chain: not updating the stores - do we need private CA roots?
// Calls to SSL_CTX_load_verify_locations would go here.
SSL *ssl = SSL_new(ctx);
if (ssl==NULL) {
error("Cannot allocate SSL");
goto exit_CTX;
}
SSL_set_fd(ssl, sock);
ret = SSL_connect(ssl);
if (ret != 1) {
error("SSL_connect() failed with err=%d", ret);
goto exit_SSL;
}
ret = SSL_write(ssl, b, len);
if (ret <= 0)
{
error("SSL_write() failed with err=%d", ret);
goto exit_SSL;
}
b[0] = 0;
do {
ptr = rbuf_get_linear_insert_range(buffer, &len);
ret = SSL_read(ssl, ptr, len - 1);
if (ret)
rbuf_bump_head(buffer, ret);
if (ret <= 0)
{
error("No response available - SSL_read()=%d", ret);
goto exit_FULL;
}
} while (!(ret = parse_http_response(buffer, &parse_ctx)));
if (ret != PARSE_SUCCESS) {
error("Error parsing HTTP response");
goto exit_FULL;
}
if (parse_ctx.http_code < 200 || parse_ctx.http_code >= 300) {
error("HTTP Response not Success (got %d)", parse_ctx.http_code);
goto exit_FULL;
}
len = rbuf_pop(buffer, b, b_size);
b[MIN(len, b_size-1)] = 0;
rc = 0;
exit_FULL:
exit_SSL:
SSL_free(ssl);
exit_CTX:
SSL_CTX_free(ctx);
exit_sock:
close(sock);
exit_buf:
rbuf_free(buffer);
return rc;
}
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