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#include <libwebsockets.h>
#include <string.h>
#include <zlib.h>
#include "html.h"
#include "server.h"
#include "utils.h"
enum { AUTH_OK, AUTH_FAIL, AUTH_ERROR };
static char *html_cache = NULL;
static size_t html_cache_len = 0;
static int send_unauthorized(struct lws *wsi, unsigned int code, enum lws_token_indexes header) {
unsigned char buffer[1024 + LWS_PRE], *p, *end;
p = buffer + LWS_PRE;
end = p + sizeof(buffer) - LWS_PRE;
if (lws_add_http_header_status(wsi, code, &p, end) ||
lws_add_http_header_by_token(wsi, header, (unsigned char *)"Basic realm=\"ttyd\"", 18, &p, end) ||
lws_add_http_header_content_length(wsi, 0, &p, end) || lws_finalize_http_header(wsi, &p, end) ||
lws_write(wsi, buffer + LWS_PRE, p - (buffer + LWS_PRE), LWS_WRITE_HTTP_HEADERS) < 0)
return AUTH_FAIL;
return lws_http_transaction_completed(wsi) ? AUTH_FAIL : AUTH_ERROR;
}
static int check_auth(struct lws *wsi, struct pss_http *pss) {
if (server->auth_header != NULL) {
if (lws_hdr_custom_length(wsi, server->auth_header, strlen(server->auth_header)) > 0) return AUTH_OK;
return send_unauthorized(wsi, HTTP_STATUS_PROXY_AUTH_REQUIRED, WSI_TOKEN_HTTP_PROXY_AUTHENTICATE);
}
if(server->credential != NULL) {
char buf[256];
int len = lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_AUTHORIZATION);
if (len >= 7 && strstr(buf, "Basic ")) {
if (!strcmp(buf + 6, server->credential)) return AUTH_OK;
}
return send_unauthorized(wsi, HTTP_STATUS_UNAUTHORIZED, WSI_TOKEN_HTTP_WWW_AUTHENTICATE);
}
return AUTH_OK;
}
static bool accept_gzip(struct lws *wsi) {
char buf[256];
int len = lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_HTTP_ACCEPT_ENCODING);
return len > 0 && strstr(buf, "gzip") != NULL;
}
static bool uncompress_html(char **output, size_t *output_len) {
if (html_cache == NULL || html_cache_len == 0) {
z_stream stream;
memset(&stream, 0, sizeof(stream));
if (inflateInit2(&stream, 16 + 15) != Z_OK) return false;
html_cache_len = index_html_size;
html_cache = xmalloc(html_cache_len);
stream.avail_in = index_html_len;
stream.avail_out = html_cache_len;
stream.next_in = (void *)index_html;
stream.next_out = (void *)html_cache;
int ret = inflate(&stream, Z_SYNC_FLUSH);
inflateEnd(&stream);
if (ret != Z_STREAM_END) {
free(html_cache);
html_cache = NULL;
html_cache_len = 0;
return false;
}
}
*output = html_cache;
*output_len = html_cache_len;
return true;
}
static void pss_buffer_free(struct pss_http *pss) {
if (pss->buffer != (char *)index_html && pss->buffer != html_cache) free(pss->buffer);
}
static void access_log(struct lws *wsi, const char *path) {
char rip[50];
lws_get_peer_simple(lws_get_network_wsi(wsi), rip, sizeof(rip));
lwsl_notice("HTTP %s - %s\n", path, rip);
}
int callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) {
struct pss_http *pss = (struct pss_http *)user;
unsigned char buffer[4096 + LWS_PRE], *p, *end;
char buf[256];
bool done = false;
switch (reason) {
case LWS_CALLBACK_HTTP:
access_log(wsi, (const char *)in);
snprintf(pss->path, sizeof(pss->path), "%s", (const char *)in);
switch (check_auth(wsi, pss)) {
case AUTH_OK:
break;
case AUTH_FAIL:
return 0;
case AUTH_ERROR:
default:
return 1;
}
p = buffer + LWS_PRE;
end = p + sizeof(buffer) - LWS_PRE;
if (strcmp(pss->path, endpoints.token) == 0) {
const char *credential = server->credential != NULL ? server->credential : "";
size_t n = sprintf(buf, "{\"token\": \"%s\"}", credential);
if (lws_add_http_header_status(wsi, HTTP_STATUS_OK, &p, end) ||
lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"application/json;charset=utf-8", 30, &p, end) ||
lws_add_http_header_content_length(wsi, (unsigned long)n, &p, end) ||
lws_finalize_http_header(wsi, &p, end) ||
lws_write(wsi, buffer + LWS_PRE, p - (buffer + LWS_PRE), LWS_WRITE_HTTP_HEADERS) < 0)
return 1;
pss->buffer = pss->ptr = strdup(buf);
pss->len = n;
lws_callback_on_writable(wsi);
break;
}
// redirects `/base-path` to `/base-path/`
if (strcmp(pss->path, endpoints.parent) == 0) {
if (lws_add_http_header_status(wsi, HTTP_STATUS_FOUND, &p, end) ||
lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_LOCATION, (unsigned char *)endpoints.index,
(int)strlen(endpoints.index), &p, end) ||
lws_add_http_header_content_length(wsi, 0, &p, end) || lws_finalize_http_header(wsi, &p, end) ||
lws_write(wsi, buffer + LWS_PRE, p - (buffer + LWS_PRE), LWS_WRITE_HTTP_HEADERS) < 0)
return 1;
goto try_to_reuse;
}
if (strcmp(pss->path, endpoints.index) != 0) {
lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
goto try_to_reuse;
}
const char *content_type = "text/html";
if (server->index != NULL) {
int n = lws_serve_http_file(wsi, server->index, content_type, NULL, 0);
if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi))) return 1;
} else {
char *output = (char *)index_html;
size_t output_len = index_html_len;
if (lws_add_http_header_status(wsi, HTTP_STATUS_OK, &p, end) ||
lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE, (const unsigned char *)content_type, 9, &p,
end))
return 1;
#ifdef LWS_WITH_HTTP_STREAM_COMPRESSION
if (!uncompress_html(&output, &output_len)) return 1;
#else
if (accept_gzip(wsi)) {
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_ENCODING, (unsigned char *)"gzip", 4, &p, end))
return 1;
} else {
if (!uncompress_html(&output, &output_len)) return 1;
}
#endif
if (lws_add_http_header_content_length(wsi, (unsigned long)output_len, &p, end) ||
lws_finalize_http_header(wsi, &p, end) ||
lws_write(wsi, buffer + LWS_PRE, p - (buffer + LWS_PRE), LWS_WRITE_HTTP_HEADERS) < 0)
return 1;
pss->buffer = pss->ptr = output;
pss->len = output_len;
lws_callback_on_writable(wsi);
}
break;
case LWS_CALLBACK_HTTP_WRITEABLE:
if (!pss->buffer || pss->len == 0) {
goto try_to_reuse;
}
do {
int n = sizeof(buffer) - LWS_PRE;
int m = lws_get_peer_write_allowance(wsi);
if (m == 0) {
lws_callback_on_writable(wsi);
return 0;
} else if (m != -1 && m < n) {
n = m;
}
if (pss->ptr + n > pss->buffer + pss->len) {
n = (int)(pss->len - (pss->ptr - pss->buffer));
done = true;
}
memcpy(buffer + LWS_PRE, pss->ptr, n);
pss->ptr += n;
if (lws_write_http(wsi, buffer + LWS_PRE, (size_t)n) < n) {
pss_buffer_free(pss);
return -1;
}
} while (!lws_send_pipe_choked(wsi) && !done);
if (!done && pss->ptr < pss->buffer + pss->len) {
lws_callback_on_writable(wsi);
break;
}
pss_buffer_free(pss);
goto try_to_reuse;
case LWS_CALLBACK_HTTP_FILE_COMPLETION:
goto try_to_reuse;
#if (defined(LWS_OPENSSL_SUPPORT) || defined(LWS_WITH_TLS)) && !defined(LWS_WITH_MBEDTLS)
case LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION:
if (!len || (SSL_get_verify_result((SSL *)in) != X509_V_OK)) {
int err = X509_STORE_CTX_get_error((X509_STORE_CTX *)user);
int depth = X509_STORE_CTX_get_error_depth((X509_STORE_CTX *)user);
const char *msg = X509_verify_cert_error_string(err);
lwsl_err("client certificate verification error: %s (%d), depth: %d\n", msg, err, depth);
return 1;
}
break;
#endif
default:
break;
}
return 0;
/* if we're on HTTP1.1 or 2.0, will keep the idle connection alive */
try_to_reuse:
if (lws_http_transaction_completed(wsi)) return -1;
return 0;
}
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