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jcc.c
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1998-10-30
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char *jcc_rcs = "$Id: jcc.c,v 3.42 1998/10/29 03:11:21 ACJC Exp $";
/* Written and copyright 1997 Anonymous Coders and Junkbusters Corporation.
* Distributed under the GNU General Public License; see the README file.
* This code comes with NO WARRANTY. http://www.junkbusters.com/ht/en/gpl.html
*/
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#ifdef _WIN32
#include <sys/timeb.h>
#include <windows.h>
#include <io.h>
#include <process.h>
#else
#include <unistd.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/stat.h>
#ifdef __BEOS__
#include <socket.h> /* BeOS has select() for sockets only. */
#include <OS.h> /* declarations for threads and stuff. */
#endif
#ifndef FD_ZERO
#include <select.h>
#endif
#endif
#ifdef REGEX
#include <gnu_regex.h>
#endif
#include "jcc.h"
char *prog;
#define BODY "<body bgcolor=\"#f8f8f0\" link=\"#000078\" alink=\"#ff0022\" vlink=\"#787878\">\n"
char CFAIL[] = "HTTP/1.0 503 Connect failed\n"
"Content-Type: text/html\n\n"
"<html>\n"
"<head>\n"
"<title>Internet Junkbuster: Connect failed</title>\n"
"</head>\n"
BODY
"<h1><center>"
BANNER
"</center></h1>"
"TCP connection to '%s' failed: %s.\n<br>"
"</body>\n"
"</html>\n"
;
char CNXDOM[] = "HTTP/1.0 404 Non-existent domain\n"
"Content-Type: text/html\n\n"
"<html>\n"
"<head>\n"
"<title>Internet Junkbuster: Non-existent domain</title>\n"
"</head>\n"
BODY
"<h1><center>"
BANNER
"</center></h1>"
"No such domain: %s\n"
"</body>\n"
"</html>\n"
;
char CSUCCEED[] = "HTTP/1.0 200 Connection established\n"
"Proxy-Agent: IJ/" VERSION "\n\n"
;
char CHEADER[] = "HTTP/1.0 400 Invalid header received from browser\n\n";
char SHEADER[] = "HTTP/1.0 502 Invalid header received from server\n\n";
char VANILLA_WAFER[] =
"NOTICE=TO_WHOM_IT_MAY_CONCERN_"
"Do_not_send_me_any_copyrighted_information_other_than_the_"
"document_that_I_am_requesting_or_any_of_its_necessary_components._"
"In_particular_do_not_send_me_any_cookies_that_"
"are_subject_to_a_claim_of_copyright_by_anybody._"
"Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
"(copyright_or_otherwise)_applying_to_any_cookie._";
char DEFAULT_USER_AGENT[] ="User-Agent: Mozilla/3.01Gold (Macintosh; I; 68K)";
int debug = 0;
int multi_threaded = 1;
int hideConsole = 0;
#ifdef _WIN32
#define sleep(N) Sleep(((N) * 1000))
#endif
char *logfile = NULL;
FILE *logfp;
char *blockfile = NULL;
char *cookiefile = NULL;
char *trustfile = NULL;
char *forwardfile = NULL;
char *aclfile = NULL;
char *jarfile = NULL;
FILE *jar;
char *referrer = NULL;
char *uagent = NULL;
char *from = NULL;
int suppress_vanilla_wafer = 0;
int add_forwarded = 0;
struct client_state clients[1];
struct file_list files[1];
struct list wafer_list[1];
struct list xtra_list[1];
struct list trust_info[1];
struct url_spec * trust_list[64];
int (*loaders[NLOADERS])();
struct gateway gateways[] = {
/* type function gw type/host/port, fw host/port*/
{ "direct", direct_connect, 0, NULL, 0, NULL, 0 },
{ ".", direct_connect, 0, NULL, 0, NULL, 0 },
{ "socks", socks4_connect, SOCKS_4, NULL, 1080, NULL, 0 },
{ "socks4", socks4_connect, SOCKS_4, NULL, 1080, NULL, 0 },
{ "socks4a", socks4_connect, SOCKS_4A, NULL, 1080, NULL, 0 },
{ NULL, NULL, 0, NULL, 0, NULL, 0 }
};
struct gateway *gw_default = gateways;
char *haddr = "127.0.0.1"; /* default binding to localhost */
int hport = 8000;
struct proxy_args proxy_args[1];
int
write_socket(int fd, char *buf, int n)
{
if(n <= 0) return(0);
if(DEBUG(LOG)) fwrite(buf, n, 1, logfp);
#if defined(_WIN32) || defined(__BEOS__)
return send(fd, buf, n, 0);
#else
return write(fd, buf, n);
#endif
}
int
read_socket(int fd, char *buf, int n)
{
if(n <= 0) return(0);
#if defined(_WIN32) || defined(__BEOS__)
return recv(fd, buf, n, 0);
#else
return read(fd, buf, n);
#endif
}
void
close_socket(int fd)
{
#if defined(_WIN32) || defined(__BEOS__)
closesocket(fd);
#else
close(fd);
#endif
}
void
chat(struct client_state *csp)
{
char buf[BUFSIZ], *hdr, *p, *req;
char *err = NULL;
char *eno;
fd_set rfds;
int n, maxfd, server_body;
struct cookie_spec *cs;
struct gateway *gw;
struct http_request *http;
http = csp->http;
/* read the client's request.
* note that since we're not using select()
* we could get blocked here if a client
* connected, then didn't say anything!
*/
for(;;) {
n = read_socket(csp->cfd, buf, sizeof(buf));
if(n <= 0) break; /* error! */
add_to_iob(csp, buf, n);
req = get_header(csp);
if(req == NULL) break; /* no HTTP request! */
if(*req == '\0') continue; /* more to come! */
parse_http_request(req, http, csp);
freez(req);
break;
}
if(http->cmd == NULL) {
strcpy(buf, CHEADER);
write_socket(csp->cfd, buf, strlen(buf));
return;
}
/* decide how to route the HTTP request */
if((gw = forward_url(http, csp)) == NULL) {
fprintf(logfp,
"%s: gateway spec is NULL!?!? This can't happen!\n", prog);
abort();
}
/* build the http request to send to the server
* we have to do one of the following:
*
* create = use the original HTTP request to create a new
* HTTP request that has only the path component
* without the http://domainspec
* pass = pass the original HTTP request unchanged
*
* drop = drop the HTTP request
*
* here's the matrix:
* SSL
* 0 1
* +--------+--------+
* | | |
* 0 | create | drop |
* | | |
* Forwarding +--------+--------+
* | | |
* 1 | pass | pass |
* | | |
* +--------+--------+
*
*/
if(gw->forward_host) {
/* if forwarding, just pass the request as is */
enlist(csp->headers, http->cmd);
} else {
if(http->ssl == 0) {
/* otherwise elide the host information from the url */
p = NULL;
p = strsav(p, http->gpc);
p = strsav(p, " ");
p = strsav(p, http->path);
p = strsav(p, " ");
p = strsav(p, http->ver);
enlist(csp->headers, p);
freez(p);
}
}
/* decide what we're to do with cookies */
if((cs = cookie_url(http, csp))) {
csp->accept_server_cookie = cs->accept_server_cookie;
csp->send_user_cookie = cs->send_user_cookie;
} else {
csp->accept_server_cookie = 0;
csp->send_user_cookie = 0;
}
/* grab the rest of the client's headers */
for(;;) {
if(( p = get_header(csp))
&& (*p == '\0')) {
n = read_socket(csp->cfd, buf, sizeof(buf));
if(n <= 0) {
fprintf(logfp,
"%s: read from client failed: ", prog);
fperror(logfp, "");
return;
}
add_to_iob(csp, buf, n);
continue;
}
if(p == NULL) break;
enlist(csp->headers, p);
freez(p);
}
/* filter it as required */
hdr = sed(client_patterns, add_client_headers, csp);
destroy_list(csp->headers);
if((p = intercept_url(http, csp))
|| (p = block_url(http, csp))
|| (p = trust_url(http, csp))) {
if(DEBUG(GPC)) {
fprintf(logfp, "%s: GPC\t%s%s crunch!\n",
prog, http->hostport, http->path);
}
write_socket(csp->cfd, p, strlen(p));
if(DEBUG(LOG)) fwrite(p, strlen(p), 1, logfp);
freez(p);
freez(hdr);
return;
}
if(DEBUG(GPC)) {
fprintf(logfp, "%s: GPC\t%s%s\n",
prog, http->hostport, http->path);
}
if(DEBUG(CON)) {
if(gw->forward_host) {
fprintf(logfp,
"%s: connect via %s:%d to: %s ... ",
prog,
gw->forward_host,
gw->forward_port,
http->hostport);
} else {
fprintf(logfp,
"%s: connect to: %s ... ",
prog, http->hostport);
}
}
/* here we connect to the server, gateway, or the forwarder */
csp->sfd = (gw->conn)(gw, http, csp);
if(csp->sfd < 0) {
if(DEBUG(CON)) {
fprintf(logfp, "%s: connect to: %s failed: ",
prog, http->hostport);
fperror(logfp, "");
}
if(errno == EINVAL) {
err = zalloc(strlen(CNXDOM) + strlen(http->host));
sprintf(err, CNXDOM, http->host);
} else {
eno = safe_strerror(errno);
err = zalloc(strlen(CFAIL) + strlen(http->hostport) + strlen(eno));
sprintf(err, CFAIL, http->hostport, eno);
}
write_socket(csp->cfd, err, strlen(err));
if(DEBUG(LOG)) fwrite(err, strlen(err), 1, logfp);
freez(err);
freez(hdr);
return;
}
if(DEBUG(CON)) {
fprintf(logfp, "OK\n");
}
if(gw->forward_host || (http->ssl == 0)) {
/* write the client's (modified) header to the server
* (along with anything else that may be in the buffer)
*/
n = strlen(hdr);
if((write_socket(csp->sfd, hdr, n) != n)
|| (flush_socket(csp->sfd, csp ) < 0)) {
if(DEBUG(CON)) {
fprintf(logfp, "%s: write header to: %s failed: ",
prog, http->hostport);
fperror(logfp, "");
}
eno = safe_strerror(errno);
err = zalloc(strlen(CFAIL) + strlen(http->hostport) + strlen(eno));
sprintf(err, CFAIL, http->hostport, eno);
write_socket(csp->cfd, err, strlen(err));
freez(err);
freez(hdr);
return;
}
} else {
/* we're running an SSL tunnel and we're not
* forwarding, so just send the "connect succeeded"
* message to the client, flush the rest, and
* get out of the way.
*/
if(write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1) < 0) {
freez(hdr);
return;
}
IOB_RESET(csp);
}
/* we're finished with the client's header */
freez(hdr);
maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
/* pass data between the client and server
* until one or the other shuts down the connection.
*/
server_body = 0;
for(;;) {
FD_ZERO(&rfds);
FD_SET(csp->cfd, &rfds);
FD_SET(csp->sfd, &rfds);
n = select(maxfd+1, &rfds, NULL, NULL, NULL);
if(n < 0) {
fprintf(logfp, "%s: select() failed!: ", prog);
fperror(logfp, "");
return;
}
/* this is the body of the browser's request
* just read it and write it.
*/
if(FD_ISSET(csp->cfd, &rfds)) {
n = read_socket(csp->cfd, buf, sizeof(buf));
if(n <= 0) break; /* "game over, man" */
if(write_socket(csp->sfd, buf, n) != n) {
fprintf(logfp, "%s: write to: %s failed: ",
prog, http->host);
fperror(logfp, "");
return;
}
continue;
}
/* the server wants to talk.
* it could be the header or the body.
* if `hdr' is null, then it's the header
* otherwise it's the body
*/
if(FD_ISSET(csp->sfd, &rfds)) {
n = read_socket(csp->sfd, buf, sizeof(buf));
if(n < 0) {
fprintf(logfp, "%s: read from: %s failed: ",
prog, http->host);
fperror(logfp, "");
eno = safe_strerror(errno);
sprintf(buf, CFAIL, http->hostport, eno);
freez(eno);
write_socket(csp->cfd, buf, strlen(buf));
return;
}
if(n == 0) break; /* "game over, man" */
/* if this is an SSL connection or we're in the body
* of the server document, just write it to the client.
*/
if(server_body || http->ssl) {
/* just write */
if(write_socket(csp->cfd, buf, n) != n) {
fprintf(logfp, "%s: write to client failed: ",
prog);
fperror(logfp, "");
return;
}
continue;
} else {
/* we're still looking for the end of the
* server's header ... (does that make header
* parsing an "out of body experience" ?
*/
/* buffer up the data we just read */
add_to_iob(csp, buf, n);
/* get header lines from the iob */
while((p = get_header(csp))) {
if(*p == '\0') {
/* see following note */
break;
}
enlist(csp->headers, p);
freez(p);
}
/* NOTE: there are no "empty" headers so
* if the pointer `p' is not NULL we must
* assume that we reached the end of the
* buffer before we hit the end of the header.
*
* Since we have to wait for more from the
* server before we can parse the headers
* we just continue here.
*/
if(p) continue;
/* we have now received the entire header.
* filter it and send the result to the client
*/
hdr = sed(
server_patterns,
add_server_headers,
csp);
n = strlen(hdr);
/* write the server's (modified) header to
* the client (along with anything else that
* may be in the buffer)
*/
if((write_socket(csp->cfd, hdr, n) != n)
|| (flush_socket(csp->cfd, csp ) < 0)) {
if(DEBUG(CON)) {
fprintf(logfp,
"%s: write header to client failed: ",
prog);
fperror(logfp, "");
}
/* the write failed, so don't bother
* mentioning it to the client...
* it probably can't hear us anyway.
*/
freez(hdr);
return;
}
/* we're finished with the server's header */
freez(hdr);
server_body = 1;
}
continue;
}
return; /* huh? we should never get here */
}
}
void
serve(struct client_state *csp)
{
chat(csp);
close_socket(csp->cfd);
if(csp->sfd >= 0) {
close_socket(csp->sfd);
}
csp->active = 0;
}
#ifdef __BEOS__
int32
server_thread(void *data)
{
serve((struct client_state *) data);
return 0;
}
#endif
int
main(int argc, char *argv[])
{
char buf[BUFSIZ];
int cfd, bfd;
char *p, *q;
extern char *optarg;
extern int optind;
struct client_state *csp;
char *default_configfile = NULL;
char *configfile = NULL;
FILE *configfp = NULL;
int err = 0;
prog = argv[0];
logfp = stdout;
init_proxy_args(argc, argv);
cfd = -1;
#ifdef _WIN32
default_configfile = "junkbstr.ini";
#endif
configfile = default_configfile;
if(argc > 1) {
configfile = argv[1];
}
if(configfile) {
if((configfp = fopen(configfile, "r")) == NULL) {
if(configfile != default_configfile) {
fprintf(logfp,
"%s: can't open configuration file '%s': ",
prog, configfile);
fperror(logfp, "");
exit(1);
}
}
}
if(configfp) {
int line_num = 0;
while(fgets(buf, sizeof(buf), configfp)) {
char cmd[BUFSIZ];
char arg[BUFSIZ];
char tmp[BUFSIZ];
line_num++;
strcpy(tmp, buf);
if((p = strpbrk(tmp, "#\r\n"))) *p = '\0';
p = tmp;
/* leading skip whitespace */
while(*p && ((*p == ' ') || (*p == '\t'))) p++;
q = cmd;
while(*p && (*p != ' ') && (*p != '\t')) *q++ = *p++;
*q = '\0';
while(*p && ((*p == ' ') || (*p == '\t'))) p++;
strcpy(arg, p);
p = arg + strlen(arg) - 1;
/* ignore trailing whitespace */
while(*p && ((*p == ' ') || (*p == '\t'))) *p-- = '\0';
if(*cmd == '\0') continue;
/* insure the command field is lower case */
for(p=cmd; *p; p++) if(isupper(*p)) *p = tolower(*p);
savearg(cmd, arg);
if(strcmp(cmd, "trustfile") == 0) {
trustfile = strdup(arg);
continue;
}
if(strcmp(cmd, "trust_info_url") == 0) {
enlist(trust_info, arg);
continue;
}
if(strcmp(cmd, "debug") == 0) {
debug |= atoi(arg);
continue;
}
if(strcmp(cmd, "add-forwarded-header") == 0) {
add_forwarded = 1;
continue;
}
if(strcmp(cmd, "single-threaded") == 0) {
multi_threaded = 0;
continue;
}
if(strcmp(cmd, "suppress-vanilla-wafer") == 0) {
suppress_vanilla_wafer = 1;
continue;
}
if(strcmp(cmd, "wafer") == 0) {
enlist(wafer_list, arg);
continue;
}
if(strcmp(cmd, "add-header") == 0) {
enlist(xtra_list, arg);
continue;
}
if(strcmp(cmd, "cookiefile") == 0) {
cookiefile = strdup(arg);
continue;
}
if(strcmp(cmd, "logfile") == 0) {
logfile = strdup(arg);
continue;
}
if(strcmp(cmd, "blockfile") == 0) {
blockfile = strdup(arg);
continue;
}
if(strcmp(cmd, "jarfile") == 0) {
jarfile = strdup(arg);
continue;
}
if(strcmp(cmd, "listen-address") == 0) {
haddr = strdup(arg);
continue;
}
if(strcmp(cmd, "forwardfile") == 0) {
forwardfile = strdup(arg);
continue;
}
if(strcmp(cmd, "aclfile") == 0) {
aclfile = strdup(arg);
continue;
}
if(strcmp(cmd, "user-agent") == 0) {
uagent = strdup(arg);
continue;
}
if((strcmp(cmd, "referrer") == 0)
|| (strcmp(cmd, "referer" ) == 0)) {
referrer = strdup(arg);
continue;
}
if(strcmp(cmd, "from") == 0) {
from = strdup(arg);
continue;
}
if(strcmp(cmd, "hide-console") == 0) {
hideConsole = 1;
continue;
}
fprintf(logfp,
"%s: unrecognized directive "
"in configuration file "
"at line number %d:\n%s",
prog, line_num, buf);
err = 1;
}
fclose(configfp);
}
if(err) exit(1);
#ifdef _WIN32
InitWin32();
#endif
if(logfile) {
FILE *tlog = fopen(logfile, "a");
if(tlog == NULL) {
fprintf(logfp, "%s: can't open logfile '%s': ",
prog, logfile);
fperror(logfp, "");
err = 1;
}
logfp = tlog;
}
setbuf(logfp, NULL);
if(cookiefile) add_loader(load_cookiefile);
if(blockfile) add_loader(load_blockfile);
if(trustfile) add_loader(load_trustfile);
if(forwardfile) add_loader(load_forwardfile);
if(aclfile) add_loader(load_aclfile);
if(jarfile) {
jar = fopen(jarfile, "a");
if(jar == NULL) {
fprintf(logfp, "%s: can't open jarfile '%s': ",
prog, jarfile);
fperror(logfp, "");
err = 1;
}
setbuf(jar, NULL);
}
if(haddr) {
if((p = strchr(haddr, ':'))) {
*p++ = '\0';
if(*p) hport = atoi(p);
}
if(hport <= 0) {
*--p = ':' ;
fprintf(logfp, "%s: invalid bind port spec %s",
prog, haddr);
err = 1;
}
if(*haddr == '\0') haddr = NULL;
}
if(run_loader(NULL)) err = 1;
if(err) exit(1);
/* if we're logging cookies in a cookie jar,
* and the user has not supplied any wafers,
* and the user has not told us to suppress the vanilla wafer,
* then send the vanilla wafer.
*/
if((jarfile != NULL)
&& (wafer_list->next == NULL)
&& (suppress_vanilla_wafer == 0)) {
enlist(wafer_list, VANILLA_WAFER);
}
if(DEBUG(CON)) {
fprintf(logfp, "%s: bind (%s, %d)\n",
prog, haddr ? haddr : "INADDR_ANY", hport);
}
bfd = bind_port(haddr, hport);
if(bfd < 0) {
fprintf(logfp, "%s: can't bind %s:%d: ",
prog, haddr ? haddr : "INADDR_ANY", hport);
fperror(logfp, "");
fprintf(logfp,
"There may be another junkbuster or some other "
"proxy running on port %d\n", hport);
err = 1;
}
if(err) exit(1);
end_proxy_args();
#ifndef _WIN32
signal(SIGPIPE, SIG_IGN);
signal(SIGCHLD, SIG_IGN);
#endif
#ifdef _WIN32
{
/* print a verbose messages about FAQ's and such */
extern char *win32_blurb;
if(logfp == stdout) fprintf(logfp, win32_blurb);
}
#endif
for(;;) {
#if !defined(_WIN32) && !defined(__BEOS__)
while(waitpid(-1, NULL, WNOHANG) > 0) {
/* zombie children */
}
#endif
sweep();
if(DEBUG(CON)) {
fprintf(logfp, "%s: accept connection ... ", prog);
}
cfd = accept_connection(bfd);
if(cfd < 0) {
if(DEBUG(CON)) {
fprintf(logfp, "%s: accept failed: ", prog);
fperror(logfp, "");
}
continue;
} else {
if(DEBUG(CON)) {
fprintf(logfp, "OK\n");
}
}
csp = (struct client_state *) malloc(sizeof(*csp));
if(csp == NULL) {
fprintf(logfp, "%s: malloc(%d) for csp failed: ", prog, sizeof(*csp));
fperror(logfp, "");
close_socket(cfd);
continue;
}
memset(csp, '\0', sizeof(*csp));
csp->active = 1;
csp->cfd = cfd;
csp->sfd = -1;
csp->ip_addr_str = remote_ip_str;
csp->ip_addr_long = remote_ip_long;
/* add it to the list of clients */
csp->next = clients->next;
clients->next = csp;
if(run_loader(csp)) {
fprintf(logfp, "%s: a loader failed - must exit\n", prog);
exit(1);
}
if(multi_threaded) {
int child_id;
/* this is a switch() statment in the C preprocessor - ugh */
#undef SELECTED_ONE_OPTION
#if defined(_WIN32) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
child_id = _beginthread(
(void*)serve,
64 * 1024,
csp);
#endif
#if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
#define SELECTED_ONE_OPTION
{
thread_id tid = spawn_thread
(server_thread, "server", B_NORMAL_PRIORITY, csp);
if ((tid >= 0) && (resume_thread(tid) == B_OK)) {
child_id = (int) tid;
} else {
child_id = -1;
}
}
#endif
#if !defined(SELECTED_ONE_OPTION)
child_id = fork();
#endif
#undef SELECTED_ONE_OPTION
/* end of cpp switch() */
if(child_id < 0) { /* failed */
fprintf(logfp, "%s: can't fork: ", prog);
fperror(logfp, "");
sprintf(buf , "%s: can't fork: errno = %d",
prog, errno);
write_socket(csp->cfd, buf, strlen(buf));
close_socket(csp->cfd);
csp->active = 0;
sleep(5);
continue;
}
#if !defined(_WIN32) && !defined(__BEOS__)
/* This block is only needed when using fork().
* When using threads, the server thread was
* created and run by the call to _beginthread().
*/
if(child_id == 0) { /* child */
serve(csp);
_exit(0);
} else { /* parent */
/* in a fork()'d environment, the parent's
* copy of the client socket and the CSP
* are not used.
*/
close_socket(csp->cfd);
csp->active = 0;
}
#endif
} else {
serve(csp);
}
}
/* NOTREACHED */
}
char *
safe_strerror(int err)
{
char buf[BUFSIZ];
char *s = NULL;
#ifndef NOSTRERROR
s = strerror(err);
#endif /* NOSTRERROR */
if(s == NULL) {
sprintf(buf, "(errno = %d)", err);
s = buf;
}
return(strdup(s));
}
void
fperror(FILE *fp, char *str)
{
char *eno = safe_strerror(errno);
if(str && *str) {
fprintf(fp, "%s: %s\n", str, eno);
} else {
fprintf(fp, "%s\n", eno);
}
freez(eno);
}