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hook close() to prevent rude programs like ssh to close our pipes

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those pipes are needed to talk with the dns-name allocator thread.

closes #9
This commit is contained in:
rofl0r 2013-01-21 01:54:45 +01:00
parent a8e8cced6d
commit 1da09e49e5
4 changed files with 26 additions and 3 deletions
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13
src/allocator_thread.c
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@ -8,6 +8,7 @@
#include <string.h> #include <string.h>
#include <stdint.h> #include <stdint.h>
#include <stddef.h> #include <stddef.h>
#include <errno.h>
#include "allocator_thread.h" #include "allocator_thread.h"
#include "shm.h" #include "shm.h"
#include "debug.h" #include "debug.h"
@ -147,8 +148,8 @@ struct at_msghdr {
static pthread_t allocator_thread; static pthread_t allocator_thread;
static pthread_attr_t allocator_thread_attr; static pthread_attr_t allocator_thread_attr;
static int req_pipefd[2]; int req_pipefd[2];
static int resp_pipefd[2]; int resp_pipefd[2];
static int wait_data(int readfd) { static int wait_data(int readfd) {
PFUNC(); PFUNC();
@ -158,7 +159,13 @@ static int wait_data(int readfd) {
int ret; int ret;
while((ret = select(readfd+1, &fds, NULL, NULL, NULL)) <= 0) { while((ret = select(readfd+1, &fds, NULL, NULL, NULL)) <= 0) {
if(ret < 0) { if(ret < 0) {
perror("select2"); int e = errno;
if(e == EINTR) continue;
#ifdef __GLIBC__
char emsg[1024];
char* x = strerror_r(errno, emsg, sizeof emsg);
dprintf(2, "select2: %s\n", x);
#endif
return 0; return 0;
} }
} }

3
src/allocator_thread.h
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@ -6,6 +6,9 @@
#define MSG_LEN_MAX 256 #define MSG_LEN_MAX 256
extern int req_pipefd[2];
extern int resp_pipefd[2];
void at_init(void); void at_init(void);
void at_close(void); void at_close(void);
size_t at_get_host_for_ip(ip_type ip, char* readbuf); size_t at_get_host_for_ip(ip_type ip, char* readbuf);

1
src/core.h
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@ -82,6 +82,7 @@ int connect_proxy_chain (int sock, ip_type target_ip, unsigned short target_port
void proxychains_write_log(char *str, ...); void proxychains_write_log(char *str, ...);
typedef int (*close_t)(int);
typedef int (*connect_t)(int, const struct sockaddr *, socklen_t); typedef int (*connect_t)(int, const struct sockaddr *, socklen_t);
typedef struct hostent* (*gethostbyname_t)(const char *); typedef struct hostent* (*gethostbyname_t)(const char *);
typedef int (*freeaddrinfo_t)(struct addrinfo *); typedef int (*freeaddrinfo_t)(struct addrinfo *);

12
src/libproxychains.c
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@ -45,6 +45,7 @@
#define SOCKFAMILY(x) (satosin(x)->sin_family) #define SOCKFAMILY(x) (satosin(x)->sin_family)
#define MAX_CHAIN 512 #define MAX_CHAIN 512
close_t true_close;
connect_t true_connect; connect_t true_connect;
gethostbyname_t true_gethostbyname; gethostbyname_t true_gethostbyname;
getaddrinfo_t true_getaddrinfo; getaddrinfo_t true_getaddrinfo;
@ -113,6 +114,7 @@ static void do_init(void) {
SETUP_SYM(freeaddrinfo); SETUP_SYM(freeaddrinfo);
SETUP_SYM(gethostbyaddr); SETUP_SYM(gethostbyaddr);
SETUP_SYM(getnameinfo); SETUP_SYM(getnameinfo);
SETUP_SYM(close);
init_l = 1; init_l = 1;
} }
@ -282,6 +284,16 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
/******* HOOK FUNCTIONS *******/ /******* HOOK FUNCTIONS *******/
int close(int fd) {
/* prevent rude programs (like ssh) from closing our pipes */
if(fd != req_pipefd[0] && fd != req_pipefd[1] &&
fd != resp_pipefd[0] && fd != resp_pipefd[1]) {
return true_close(fd);
}
errno = EINTR;
return -1;
}
int connect(int sock, const struct sockaddr *addr, unsigned int len) { int connect(int sock, const struct sockaddr *addr, unsigned int len) {
PFUNC(); PFUNC();
int socktype = 0, flags = 0, ret = 0; int socktype = 0, flags = 0, ret = 0;