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Move wsproxy and web utils into utils/ subdir.
This commit is contained in:
Joel Martin
349
utils/websocket.c
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349
utils/websocket.c
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@@ -0,0 +1,349 @@
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/*
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* WebSocket lib with support for "wss://" encryption.
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*
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* You can make a cert/key with openssl using:
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* openssl req -new -x509 -days 365 -nodes -out self.pem -keyout self.pem
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* as taken from http://docs.python.org/dev/library/ssl.html#certificates
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <strings.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <openssl/err.h>
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#include <openssl/ssl.h>
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#include <resolv.h> /* base64 encode/decode */
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#include "websocket.h"
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const char server_handshake[] = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n\
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Upgrade: WebSocket\r\n\
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Connection: Upgrade\r\n\
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WebSocket-Origin: %s\r\n\
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WebSocket-Location: %s://%s%s\r\n\
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WebSocket-Protocol: sample\r\n\
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\r\n";
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const char policy_response[] = "<cross-domain-policy><allow-access-from domain=\"*\" to-ports=\"*\" /></cross-domain-policy>\n";
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/*
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* Global state
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*
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* Warning: not thread safe
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*/
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int ssl_initialized = 0;
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char *tbuf, *cbuf, *tbuf_tmp, *cbuf_tmp;
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unsigned int bufsize, dbufsize;
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client_settings_t client_settings;
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void traffic(char * token) {
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fprintf(stdout, "%s", token);
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fflush(stdout);
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}
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void error(char *msg)
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{
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perror(msg);
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}
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void fatal(char *msg)
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{
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perror(msg);
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exit(1);
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}
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/*
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* SSL Wrapper Code
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*/
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ssize_t ws_recv(ws_ctx_t *ctx, void *buf, size_t len) {
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if (ctx->ssl) {
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//printf("SSL recv\n");
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return SSL_read(ctx->ssl, buf, len);
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} else {
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return recv(ctx->sockfd, buf, len, 0);
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}
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}
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ssize_t ws_send(ws_ctx_t *ctx, const void *buf, size_t len) {
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if (ctx->ssl) {
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//printf("SSL send\n");
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return SSL_write(ctx->ssl, buf, len);
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} else {
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return send(ctx->sockfd, buf, len, 0);
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}
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}
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ws_ctx_t *ws_socket(int socket) {
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ws_ctx_t *ctx;
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ctx = malloc(sizeof(ws_ctx_t));
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ctx->sockfd = socket;
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ctx->ssl = NULL;
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ctx->ssl_ctx = NULL;
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return ctx;
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}
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ws_ctx_t *ws_socket_ssl(int socket, char * certfile) {
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int ret;
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char msg[1024];
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ws_ctx_t *ctx;
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ctx = ws_socket(socket);
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// Initialize the library
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if (! ssl_initialized) {
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SSL_library_init();
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OpenSSL_add_all_algorithms();
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SSL_load_error_strings();
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ssl_initialized = 1;
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}
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ctx->ssl_ctx = SSL_CTX_new(TLSv1_server_method());
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if (ctx->ssl_ctx == NULL) {
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ERR_print_errors_fp(stderr);
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fatal("Failed to configure SSL context");
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}
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if (SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, certfile,
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SSL_FILETYPE_PEM) <= 0) {
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sprintf(msg, "Unable to load private key file %s\n", certfile);
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fatal(msg);
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}
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if (SSL_CTX_use_certificate_file(ctx->ssl_ctx, certfile,
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SSL_FILETYPE_PEM) <= 0) {
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sprintf(msg, "Unable to load certificate file %s\n", certfile);
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fatal(msg);
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}
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// if (SSL_CTX_set_cipher_list(ctx->ssl_ctx, "DEFAULT") != 1) {
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// sprintf(msg, "Unable to set cipher\n");
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// fatal(msg);
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// }
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// Associate socket and ssl object
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ctx->ssl = SSL_new(ctx->ssl_ctx);
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SSL_set_fd(ctx->ssl, socket);
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ret = SSL_accept(ctx->ssl);
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if (ret < 0) {
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ERR_print_errors_fp(stderr);
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return NULL;
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}
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return ctx;
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}
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int ws_socket_free(ws_ctx_t *ctx) {
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if (ctx->ssl) {
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SSL_free(ctx->ssl);
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ctx->ssl = NULL;
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}
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if (ctx->ssl_ctx) {
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SSL_CTX_free(ctx->ssl_ctx);
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ctx->ssl_ctx = NULL;
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}
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if (ctx->sockfd) {
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close(ctx->sockfd);
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ctx->sockfd = 0;
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}
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free(ctx);
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}
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/* ------------------------------------------------------- */
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int encode(u_char const *src, size_t srclength, char *target, size_t targsize) {
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int sz = 0, len = 0;
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target[sz++] = '\x00';
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if (client_settings.do_seq_num) {
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sz += sprintf(target+sz, "%d:", client_settings.seq_num);
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client_settings.seq_num++;
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}
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if (client_settings.do_b64encode) {
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len = __b64_ntop(src, srclength, target+sz, targsize-sz);
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} else {
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fatal("UTF-8 not yet implemented");
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}
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if (len < 0) {
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return len;
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}
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sz += len;
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target[sz++] = '\xff';
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return sz;
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}
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int decode(char *src, size_t srclength, u_char *target, size_t targsize) {
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char *start, *end;
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int len, retlen = 0;
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if ((src[0] != '\x00') || (src[srclength-1] != '\xff')) {
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fprintf(stderr, "WebSocket framing error\n");
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return -1;
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}
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start = src+1; // Skip '\x00' start
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do {
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/* We may have more than one frame */
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end = strchr(start, '\xff');
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if (end < (src+srclength-1)) {
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printf("More than one frame to decode\n");
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}
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*end = '\x00';
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if (client_settings.do_b64encode) {
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len = __b64_pton(start, target+retlen, targsize-retlen);
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} else {
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fatal("UTF-8 not yet implemented");
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}
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if (len < 0) {
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return len;
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}
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retlen += len;
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start = end + 2; // Skip '\xff' end and '\x00' start
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} while (end < (src+srclength-1));
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return retlen;
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}
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ws_ctx_t *do_handshake(int sock) {
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char handshake[4096], response[4096];
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char *scheme, *line, *path, *host, *origin;
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char *args_start, *args_end, *arg_idx;
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int len;
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ws_ctx_t * ws_ctx;
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// Reset settings
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client_settings.do_b64encode = 0;
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client_settings.do_seq_num = 0;
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client_settings.seq_num = 0;
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len = recv(sock, handshake, 1024, MSG_PEEK);
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handshake[len] = 0;
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if (bcmp(handshake, "<policy-file-request/>", 22) == 0) {
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len = recv(sock, handshake, 1024, 0);
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handshake[len] = 0;
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printf("Sending flash policy response\n");
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send(sock, policy_response, sizeof(policy_response), 0);
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close(sock);
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return NULL;
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} else if (bcmp(handshake, "\x16", 1) == 0) {
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// SSL
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ws_ctx = ws_socket_ssl(sock, "self.pem");
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if (! ws_ctx) { return NULL; }
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scheme = "wss";
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printf("Using SSL socket\n");
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} else {
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ws_ctx = ws_socket(sock);
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if (! ws_ctx) { return NULL; }
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scheme = "ws";
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printf("Using plain (not SSL) socket\n");
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}
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len = ws_recv(ws_ctx, handshake, 4096);
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handshake[len] = 0;
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//printf("handshake: %s\n", handshake);
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if ((len < 92) || (bcmp(handshake, "GET ", 4) != 0)) {
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fprintf(stderr, "Invalid WS request\n");
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return NULL;
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}
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strtok(handshake, " "); // Skip "GET "
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path = strtok(NULL, " "); // Extract path
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strtok(NULL, "\n"); // Skip to Upgrade line
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strtok(NULL, "\n"); // Skip to Connection line
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strtok(NULL, "\n"); // Skip to Host line
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strtok(NULL, " "); // Skip "Host: "
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host = strtok(NULL, "\r"); // Extract host
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strtok(NULL, " "); // Skip "Origin: "
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origin = strtok(NULL, "\r"); // Extract origin
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//printf("path: %s\n", path);
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//printf("host: %s\n", host);
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//printf("origin: %s\n", origin);
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// TODO: parse out client settings
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args_start = strstr(path, "?");
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if (args_start) {
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if (strstr(args_start, "#")) {
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args_end = strstr(args_start, "#");
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} else {
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args_end = args_start + strlen(args_start);
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}
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arg_idx = strstr(args_start, "b64encode");
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if (arg_idx && arg_idx < args_end) {
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//printf("setting b64encode\n");
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client_settings.do_b64encode = 1;
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}
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arg_idx = strstr(args_start, "seq_num");
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if (arg_idx && arg_idx < args_end) {
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//printf("setting seq_num\n");
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client_settings.do_seq_num = 1;
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}
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}
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sprintf(response, server_handshake, origin, scheme, host, path);
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printf("response: %s\n", response);
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ws_send(ws_ctx, response, strlen(response));
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return ws_ctx;
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}
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void start_server(int listen_port,
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void (*handler)(ws_ctx_t*)) {
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int lsock, csock, clilen, sopt = 1;
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struct sockaddr_in serv_addr, cli_addr;
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ws_ctx_t *ws_ctx;
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/* Initialize buffers */
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bufsize = 65536;
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if (! (tbuf = malloc(bufsize)) )
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{ fatal("malloc()"); }
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if (! (cbuf = malloc(bufsize)) )
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{ fatal("malloc()"); }
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if (! (tbuf_tmp = malloc(bufsize)) )
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{ fatal("malloc()"); }
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if (! (cbuf_tmp = malloc(bufsize)) )
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{ fatal("malloc()"); }
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lsock = socket(AF_INET, SOCK_STREAM, 0);
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if (lsock < 0) { error("ERROR creating listener socket"); }
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bzero((char *) &serv_addr, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_addr.s_addr = INADDR_ANY;
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serv_addr.sin_port = htons(listen_port);
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setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR, (char *)&sopt, sizeof(sopt));
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if (bind(lsock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
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error("ERROR on binding listener socket");
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}
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listen(lsock,100);
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while (1) {
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clilen = sizeof(cli_addr);
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printf("waiting for connection on port %d\n", listen_port);
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csock = accept(lsock,
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(struct sockaddr *) &cli_addr,
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&clilen);
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if (csock < 0) {
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error("ERROR on accept");
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}
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printf("Got client connection from %s\n", inet_ntoa(cli_addr.sin_addr));
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ws_ctx = do_handshake(csock);
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if (ws_ctx == NULL) {
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close(csock);
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continue;
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}
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/* Calculate dbufsize based on client_settings */
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if (client_settings.do_b64encode) {
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/* base64 is 4 bytes for every 3
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* 20 for WS '\x00' / '\xff', seq_num and good measure */
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dbufsize = (bufsize * 3)/4 - 20;
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} else {
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fatal("UTF-8 not yet implemented");
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/* UTF-8 encoding is up to 2X larger */
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dbufsize = (bufsize/2) - 15;
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}
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handler(ws_ctx);
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close(csock);
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}
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}
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