wswrapper: wrap existing server using LD_PRELOAD.
wswrapper.so is LD_PRELOAD shared library that interposes and turns a generic TCP socket into a WebSockets service. This current version works but will only allow work for a single connection, subsequent connections will not be wrapped. In addition the wrapper interposes on the first incoming network connection. It should read an environment variable to determine the port to interpose on. Also, should limit origin based on another environment variable. Then there should be a wswrap setup script that allows easier invocation.
This commit is contained in:
Joel Martin
parent
79f0a095b6
commit
5b0bbd5c12
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@ -1,11 +1,21 @@
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TARGETS=wsproxy wswrapper.so
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CFLAGS += -fPIC
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all: $(TARGETS)
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wsproxy: wsproxy.o websocket.o md5.o
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$(CC) $(LDFLAGS) $^ -l ssl -lcrypto -l resolv -o $@
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$(CC) $(LDFLAGS) $^ -lssl -lcrypto -lresolv -o $@
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wswrapper.so: wswrapper.o md5.o
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$(CC) $(LDFLAGS) $^ -shared -fPIC -ldl -lresolv -o $@
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websocket.o: websocket.c websocket.h md5.h
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wsproxy.o: wsproxy.c websocket.h
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wswrapper.o: wswrapper.c
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$(CC) -c $(CFLAGS) -o $@ $*.c
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md5.o: md5.c md5.h
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$(CC) $(CFLAGS) -c -o $@ $*.c -DHAVE_MEMCPY -DSTDC_HEADERS
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$(CC) -c $(CFLAGS) -o $@ $*.c -DHAVE_MEMCPY -DSTDC_HEADERS
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clean:
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rm -f wsproxy wsproxy.o websocket.o md5.o
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rm -f wsproxy wswrapper.so *.o
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@ -0,0 +1,606 @@
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#include <stdio.h>
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#include <stdlib.h>
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#define __USE_GNU 1 // Pull in RTLD_NEXT
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#include <dlfcn.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 <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <resolv.h> /* base64 encode/decode */
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#include "md5.h"
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//#define DO_DEBUG 1
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#ifdef DO_DEBUG
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#define DEBUG(...) \
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if (DO_DEBUG) { \
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fprintf(stderr, "wswrapper: "); \
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fprintf(stderr, __VA_ARGS__); \
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}
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#else
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#define DEBUG(...)
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#endif
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#define MSG(...) \
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fprintf(stderr, "wswrapper: "); \
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fprintf(stderr, __VA_ARGS__);
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#define RET_ERROR(eno, ...) \
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fprintf(stderr, "wswrapper error: "); \
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fprintf(stderr, __VA_ARGS__); \
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errno = eno; \
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return -1;
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const char _WS_response[] = "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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%sWebSocket-Origin: %s\r\n\
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%sWebSocket-Location: %s://%s%s\r\n\
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%sWebSocket-Protocol: sample\r\n\
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\r\n%s";
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/* WARNING: threading not supported */
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int _WS_bufsize = 65536;
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char *_WS_rbuf = NULL;
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char *_WS_sbuf = NULL;
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int _WS_rcarry_cnt = 0;
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char _WS_rcarry[3] = "";
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int _WS_newframe = 1;
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int _WS_sockfd = 0;
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int _WS_init() {
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if (! (_WS_rbuf = malloc(_WS_bufsize)) ) {
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return 0;
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}
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if (! (_WS_sbuf = malloc(_WS_bufsize)) ) {
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return 0;
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}
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}
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int _WS_gen_md5(char *key1, char *key2, char *key3, char *target) {
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unsigned int i, spaces1 = 0, spaces2 = 0;
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unsigned long num1 = 0, num2 = 0;
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unsigned char buf[17];
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for (i=0; i < strlen(key1); i++) {
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if (key1[i] == ' ') {
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spaces1 += 1;
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}
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if ((key1[i] >= 48) && (key1[i] <= 57)) {
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num1 = num1 * 10 + (key1[i] - 48);
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}
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}
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num1 = num1 / spaces1;
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for (i=0; i < strlen(key2); i++) {
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if (key2[i] == ' ') {
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spaces2 += 1;
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}
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if ((key2[i] >= 48) && (key2[i] <= 57)) {
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num2 = num2 * 10 + (key2[i] - 48);
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}
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}
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num2 = num2 / spaces2;
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/* Pack it big-endian */
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buf[0] = (num1 & 0xff000000) >> 24;
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buf[1] = (num1 & 0xff0000) >> 16;
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buf[2] = (num1 & 0xff00) >> 8;
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buf[3] = num1 & 0xff;
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buf[4] = (num2 & 0xff000000) >> 24;
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buf[5] = (num2 & 0xff0000) >> 16;
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buf[6] = (num2 & 0xff00) >> 8;
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buf[7] = num2 & 0xff;
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strncpy(buf+8, key3, 8);
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buf[16] = '\0';
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md5_buffer(buf, 16, target);
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target[16] = '\0';
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return 1;
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}
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int _WS_handshake(int sockfd)
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{
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int sz = 0, len, idx;
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int ret = -1, save_errno = EPROTO;
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char *last, *start, *end;
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long flags;
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char handshake[4096], response[4096],
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path[1024], prefix[5] = "", scheme[10] = "ws", host[1024],
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origin[1024], key1[100], key2[100], key3[9], chksum[17];
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static void * (*rfunc)(), * (*wfunc)();
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if (!rfunc) rfunc = (void *(*)()) dlsym(RTLD_NEXT, "recv");
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if (!wfunc) wfunc = (void *(*)()) dlsym(RTLD_NEXT, "send");
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DEBUG("_WS_handshake starting\n");
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/* Disable NONBLOCK if set */
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flags = fcntl(sockfd, F_GETFL, 0);
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if (flags & O_NONBLOCK) {
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fcntl(sockfd, F_SETFL, flags^O_NONBLOCK);
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}
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while (1) {
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len = (int) rfunc(sockfd, handshake+sz, 4095, 0);
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if (len < 1) {
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ret = len;
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save_errno = errno;
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break;
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}
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sz += len;
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handshake[sz] = '\x00';
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if (sz < 4) {
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// Not enough yet
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continue;
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}
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if (strstr(handshake, "GET ") != handshake) {
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// We got something but it wasn't a WebSockets client
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break;
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}
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last = strstr(handshake, "\r\n\r\n");
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if (! last) {
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continue;
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}
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if (! strstr(handshake, "Upgrade: WebSocket\r\n")) {
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MSG("Invalid WebSockets handshake\n");
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break;
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}
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// Now parse out the data
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start = handshake+4;
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end = strstr(start, " HTTP/1.1");
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if (!end) { break; }
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snprintf(path, end-start+1, "%s", start);
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start = strstr(handshake, "\r\nHost: ");
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if (!start) { break; }
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start += 8;
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end = strstr(start, "\r\n");
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snprintf(host, end-start+1, "%s", start);
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start = strstr(handshake, "\r\nOrigin: ");
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if (!start) { break; }
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start += 10;
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end = strstr(start, "\r\n");
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snprintf(origin, end-start+1, "%s", start);
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start = strstr(handshake, "\r\n\r\n") + 4;
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if (strlen(start) == 8) {
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sprintf(prefix, "Sec-");
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snprintf(key3, 8+1, "%s", start);
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start = strstr(handshake, "\r\nSec-WebSocket-Key1: ");
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if (!start) { break; }
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start += 22;
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end = strstr(start, "\r\n");
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snprintf(key1, end-start+1, "%s", start);
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start = strstr(handshake, "\r\nSec-WebSocket-Key2: ");
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if (!start) { break; }
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start += 22;
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end = strstr(start, "\r\n");
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snprintf(key2, end-start+1, "%s", start);
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_WS_gen_md5(key1, key2, key3, chksum);
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//DEBUG("Got handshake (v76): %s\n", handshake);
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MSG("Got handshake (v76)\n");
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} else {
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sprintf(prefix, "");
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sprintf(key1, "");
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sprintf(key2, "");
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sprintf(key3, "");
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sprintf(chksum, "");
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//DEBUG("Got handshake (v75): %s\n", handshake);
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MSG("Got handshake (v75)\n");
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}
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sprintf(response, _WS_response, prefix, origin, prefix, scheme,
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host, path, prefix, chksum);
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//DEBUG("Handshake response: %s\n", response);
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wfunc(sockfd, response, strlen(response), 0);
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save_errno = 0;
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ret = 0;
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break;
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}
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/* Re-enable NONBLOCK if it was set */
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if (flags & O_NONBLOCK) {
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fcntl(sockfd, F_SETFL, flags);
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}
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errno = save_errno;
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return ret;
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}
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ssize_t _WS_recv(int recvf, int sockfd, const void *buf,
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size_t len, int flags)
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{
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int rawcount, deccount, left, rawlen, retlen, decodelen;
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int sockflags;
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int i;
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char * fstart, * fend, * cstart;
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static void * (*rfunc)(), * (*rfunc2)();
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if (!rfunc) rfunc = (void *(*)()) dlsym(RTLD_NEXT, "recv");
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if (!rfunc2) rfunc2 = (void *(*)()) dlsym(RTLD_NEXT, "read");
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if (len == 0) {
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return 0;
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}
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if ((_WS_sockfd == 0) || (_WS_sockfd != sockfd)) {
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// Not our file descriptor, just pass through
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if (recvf) {
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return (ssize_t) rfunc(sockfd, buf, len, flags);
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} else {
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return (ssize_t) rfunc2(sockfd, buf, len);
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}
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}
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DEBUG("_WS_recv(%d, _, %d) called\n", sockfd, len);
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sockflags = fcntl(sockfd, F_GETFL, 0);
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left = len;
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retlen = 0;
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// first copy in any carry-over bytes
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if (_WS_rcarry_cnt) {
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if (_WS_rcarry_cnt == 1) {
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DEBUG("Using carry byte: %u (", _WS_rcarry[0]);
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} else if (_WS_rcarry_cnt == 2) {
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DEBUG("Using carry bytes: %u,%u (", _WS_rcarry[0],
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_WS_rcarry[1]);
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} else {
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RET_ERROR(EIO, "Too many carry-over bytes\n");
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}
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if (len <= _WS_rcarry_cnt) {
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DEBUG("final)\n");
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memcpy((char *) buf, _WS_rcarry, len);
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_WS_rcarry_cnt -= len;
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return len;
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} else {
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DEBUG("prepending)\n");
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memcpy((char *) buf, _WS_rcarry, _WS_rcarry_cnt);
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retlen += _WS_rcarry_cnt;
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left -= _WS_rcarry_cnt;
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_WS_rcarry_cnt = 0;
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}
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}
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// Determine the number of base64 encoded bytes needed
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rawcount = (left * 4) / 3 + 3;
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rawcount -= rawcount%4;
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if (rawcount > _WS_bufsize - 1) {
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RET_ERROR(ENOMEM, "recv of %d bytes is larger than buffer\n", rawcount);
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}
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i = 0;
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while (1) {
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// Peek at everything available
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rawlen = (int) rfunc(sockfd, _WS_rbuf, _WS_bufsize-1,
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flags | MSG_PEEK);
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if (rawlen <= 0) {
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DEBUG("_WS_recv: returning because rawlen %d\n", rawlen);
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return (ssize_t) rawlen;
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}
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fstart = _WS_rbuf;
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/*
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while (rawlen >= 2 && fstart[0] == '\x00' && fstart[1] == '\xff') {
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fstart += 2;
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rawlen -= 2;
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}
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*/
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if (rawlen >= 2 && fstart[0] == '\x00' && fstart[1] == '\xff') {
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rawlen = (int) rfunc(sockfd, _WS_rbuf, 2, flags);
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if (rawlen != 2) {
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RET_ERROR(EIO, "Could not strip empty frame headers\n");
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}
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continue;
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}
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fstart[rawlen] = '\x00';
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if (rawlen - _WS_newframe >= 4) {
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// We have enough to base64 decode at least 1 byte
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break;
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}
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// Not enough to base64 decode
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if (sockflags & O_NONBLOCK) {
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// Just tell the caller to call again
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DEBUG("_WS_recv: returning because O_NONBLOCK, rawlen %d\n", rawlen);
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errno = EAGAIN;
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return -1;
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}
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// Repeat until at least 1 byte (4 raw bytes) to decode
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i++;
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if (i > 1000000) {
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MSG("Could not send final part of frame\n");
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}
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}
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/*
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DEBUG("_WS_recv, left: %d, len: %d, rawlen: %d, newframe: %d, raw: ",
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left, len, rawlen, _WS_newframe);
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for (i = 0; i < rawlen; i++) {
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DEBUG("%u,", (unsigned char) ((char *) fstart)[i]);
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}
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DEBUG("\n");
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*/
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if (_WS_newframe) {
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if (fstart[0] != '\x00') {
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RET_ERROR(EPROTO, "Missing frame start\n");
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}
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fstart++;
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rawlen--;
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_WS_newframe = 0;
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}
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fend = memchr(fstart, '\xff', rawlen);
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if (fend) {
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_WS_newframe = 1;
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if ((fend - fstart) % 4) {
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RET_ERROR(EPROTO, "Frame length is not multiple of 4\n");
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}
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} else {
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fend = fstart + rawlen - (rawlen % 4);
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if (fend - fstart < 4) {
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RET_ERROR(EPROTO, "Frame too short\n");
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}
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}
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// How much should we consume
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if (rawcount < fend - fstart) {
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_WS_newframe = 0;
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deccount = rawcount;
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} else {
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deccount = fend - fstart;
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}
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// Now consume what we processed
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if (flags & MSG_PEEK) {
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MSG("*** Got MSG_PEEK ***\n");
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} else {
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rfunc(sockfd, _WS_rbuf, fstart - _WS_rbuf + deccount + _WS_newframe, flags);
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}
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fstart[deccount] = '\x00'; // base64 terminator
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// Do direct base64 decode, instead of decode()
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decodelen = b64_pton(fstart, (char *) buf + retlen, deccount);
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if (decodelen <= 0) {
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RET_ERROR(EPROTO, "Base64 decode error\n");
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}
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if (decodelen <= left) {
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retlen += decodelen;
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} else {
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retlen += left;
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if (! (flags & MSG_PEEK)) {
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// Add anything left over to the carry-over
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_WS_rcarry_cnt = decodelen - left;
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if (_WS_rcarry_cnt > 2) {
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RET_ERROR(EPROTO, "Got too much base64 data\n");
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}
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memcpy(_WS_rcarry, buf + retlen, _WS_rcarry_cnt);
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if (_WS_rcarry_cnt == 1) {
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DEBUG("Saving carry byte: %u\n", _WS_rcarry[0]);
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} else if (_WS_rcarry_cnt == 2) {
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DEBUG("Saving carry bytes: %u,%u\n", _WS_rcarry[0],
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_WS_rcarry[1]);
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} else {
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MSG("Waah2!\n");
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}
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}
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}
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((char *) buf)[retlen] = '\x00';
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/*
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DEBUG("*** recv %s as ", fstart);
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for (i = 0; i < retlen; i++) {
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DEBUG("%u,", (unsigned char) ((char *) buf)[i]);
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}
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DEBUG(" (%d -> %d): %d\n", deccount, decodelen, retlen);
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*/
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return retlen;
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}
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ssize_t _WS_send(int sendf, int sockfd, const void *buf,
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size_t len, int flags)
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{
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int rawlen, enclen, rlen, over, left, clen, retlen, dbufsize;
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int sockflags;
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char * target;
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int i;
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static void * (*sfunc)(), * (*sfunc2)();
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if (!sfunc) sfunc = (void *(*)()) dlsym(RTLD_NEXT, "send");
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if (!sfunc2) sfunc2 = (void *(*)()) dlsym(RTLD_NEXT, "write");
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if ((_WS_sockfd == 0) || (_WS_sockfd != sockfd)) {
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// Not our file descriptor, just pass through
|
||||
if (sendf) {
|
||||
return (ssize_t) sfunc(sockfd, buf, len, flags);
|
||||
} else {
|
||||
return (ssize_t) sfunc2(sockfd, buf, len);
|
||||
}
|
||||
}
|
||||
DEBUG("_WS_send(%d, _, %d) called\n", sockfd, len);
|
||||
|
||||
sockflags = fcntl(sockfd, F_GETFL, 0);
|
||||
|
||||
dbufsize = (_WS_bufsize * 3)/4 - 2;
|
||||
if (len > dbufsize) {
|
||||
RET_ERROR(ENOMEM, "send of %d bytes is larger than send buffer\n", len);
|
||||
}
|
||||
|
||||
// base64 encode and add frame markers
|
||||
rawlen = 0;
|
||||
_WS_sbuf[rawlen++] = '\x00';
|
||||
enclen = b64_ntop(buf, len, _WS_sbuf+rawlen, _WS_bufsize-rawlen);
|
||||
if (enclen < 0) {
|
||||
RET_ERROR(EPROTO, "Base64 encoding error\n");
|
||||
}
|
||||
rawlen += enclen;
|
||||
_WS_sbuf[rawlen++] = '\xff';
|
||||
|
||||
rlen = (int) sfunc(sockfd, _WS_sbuf, rawlen, flags);
|
||||
|
||||
if (rlen <= 0) {
|
||||
return rlen;
|
||||
} else if (rlen < rawlen) {
|
||||
// Spin until we can send a whole base64 chunck and frame end
|
||||
over = (rlen - 1) % 4;
|
||||
left = (4 - over) % 4 + 1; // left to send
|
||||
DEBUG("_WS_send: rlen: %d (over: %d, left: %d), rawlen: %d\n", rlen, over, left, rawlen);
|
||||
rlen += left;
|
||||
_WS_sbuf[rlen-1] = '\xff';
|
||||
i = 0;
|
||||
do {
|
||||
i++;
|
||||
clen = (int) sfunc(sockfd, _WS_sbuf + rlen - left, left, flags);
|
||||
if (clen > 0) {
|
||||
left -= clen;
|
||||
} else if (clen == 0) {
|
||||
MSG("_WS_send: got clen %d\n", clen);
|
||||
} else if (!(sockflags & O_NONBLOCK)) {
|
||||
MSG("_WS_send: clen %d\n", clen);
|
||||
return clen;
|
||||
}
|
||||
if (i > 1000000) {
|
||||
MSG("Could not send final part of frame\n");
|
||||
}
|
||||
} while (left > 0);
|
||||
DEBUG("_WS_send: spins until finished %d\n", i);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Report back the number of original characters sent,
|
||||
* not the raw number sent
|
||||
*/
|
||||
// Adjust for framing
|
||||
retlen = rlen - 2;
|
||||
// Adjust for base64 padding
|
||||
if (_WS_sbuf[rlen-1] == '=') { retlen --; }
|
||||
if (_WS_sbuf[rlen-2] == '=') { retlen --; }
|
||||
|
||||
// Adjust for base64 encoding
|
||||
retlen = (retlen*3)/4;
|
||||
|
||||
/*
|
||||
DEBUG("*** send ");
|
||||
for (i = 0; i < retlen; i++) {
|
||||
DEBUG("%u,", (unsigned char) ((char *)buf)[i]);
|
||||
}
|
||||
DEBUG(" as '%s' (%d)\n", _WS_sbuf+1, rlen);
|
||||
*/
|
||||
return (ssize_t) retlen;
|
||||
}
|
||||
|
||||
|
||||
/* Override network routines */
|
||||
|
||||
/*
|
||||
int socket(int domain, int type, int protocol)
|
||||
{
|
||||
static void * (*func)();
|
||||
if (!func) func = (void *(*)()) dlsym(RTLD_NEXT, "socket");
|
||||
DEBUG("socket(_, %d, _) called\n", type);
|
||||
|
||||
return (int) func(domain, type, protocol);
|
||||
}
|
||||
|
||||
int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
|
||||
{
|
||||
static void * (*func)();
|
||||
if (!func) func = (void *(*)()) dlsym(RTLD_NEXT, "bind");
|
||||
DEBUG("bind(%d, _, %d) called\n", sockfd, addrlen);
|
||||
|
||||
return (int) func(sockfd, addr, addrlen);
|
||||
}
|
||||
*/
|
||||
|
||||
int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
|
||||
{
|
||||
int fd, ret, envfd;
|
||||
static void * (*func)();
|
||||
if (!func) func = (void *(*)()) dlsym(RTLD_NEXT, "accept");
|
||||
DEBUG("accept(%d, _, _) called\n", sockfd);
|
||||
|
||||
fd = (int) func(sockfd, addr, addrlen);
|
||||
|
||||
if (_WS_sockfd == 0) {
|
||||
_WS_sockfd = fd;
|
||||
|
||||
if (!_WS_rbuf) {
|
||||
if (! _WS_init()) {
|
||||
RET_ERROR(ENOMEM, "Could not allocate interposer buffer\n");
|
||||
}
|
||||
}
|
||||
|
||||
ret = _WS_handshake(_WS_sockfd);
|
||||
if (ret < 0) {
|
||||
errno = EPROTO;
|
||||
return ret;
|
||||
}
|
||||
MSG("interposing on fd %d\n", _WS_sockfd);
|
||||
} else {
|
||||
DEBUG("already interposing on fd %d\n", _WS_sockfd);
|
||||
}
|
||||
|
||||
return fd;
|
||||
}
|
||||
|
||||
int close(int fd)
|
||||
{
|
||||
static void * (*func)();
|
||||
if (!func) func = (void *(*)()) dlsym(RTLD_NEXT, "close");
|
||||
|
||||
if ((_WS_sockfd != 0) && (_WS_sockfd == fd)) {
|
||||
MSG("finished interposing on fd %d\n", _WS_sockfd);
|
||||
_WS_sockfd = 0;
|
||||
}
|
||||
return (int) func(fd);
|
||||
}
|
||||
|
||||
|
||||
ssize_t read(int fd, void *buf, size_t count)
|
||||
{
|
||||
//DEBUG("read(%d, _, %d) called\n", fd, count);
|
||||
return (ssize_t) _WS_recv(0, fd, buf, count, 0);
|
||||
}
|
||||
|
||||
ssize_t write(int fd, const void *buf, size_t count)
|
||||
{
|
||||
//DEBUG("write(%d, _, %d) called\n", fd, count);
|
||||
return (ssize_t) _WS_send(0, fd, buf, count, 0);
|
||||
}
|
||||
|
||||
ssize_t recv(int sockfd, void *buf, size_t len, int flags)
|
||||
{
|
||||
//DEBUG("recv(%d, _, %d, %d) called\n", sockfd, len, flags);
|
||||
return (ssize_t) _WS_recv(1, sockfd, buf, len, flags);
|
||||
}
|
||||
|
||||
ssize_t send(int sockfd, const void *buf, size_t len, int flags)
|
||||
{
|
||||
//DEBUG("send(%d, _, %d, %d) called\n", sockfd, len, flags);
|
||||
return (ssize_t) _WS_send(1, sockfd, buf, len, flags);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue