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/*
* This is desock_dup.c from the amazing preeny project
* https://github.com/zardus/preeny
*
* It is packaged in afl++ to have it at hand if needed
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h> //
#include <sys/socket.h> //
#include <sys/stat.h> //
#include <fcntl.h> //
#include <netinet/in.h>
#include <pthread.h>
#include <signal.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdio.h>
#include <poll.h>
// #include "logging.h" // switched from preeny_info() to fprintf(stderr, "Info:
// "
//
// originals
//
int (*original_close)(int);
int (*original_dup2)(int, int);
__attribute__((constructor)) void preeny_desock_dup_orig() {
original_close = dlsym(RTLD_NEXT, "close");
original_dup2 = dlsym(RTLD_NEXT, "dup2");
}
int close(int sockfd) {
if (sockfd <= 2) {
fprintf(stderr, "Info: Disabling close on %d\n", sockfd);
return 0;
} else {
return original_close(sockfd);
}
}
int dup2(int old, int new) {
if (new <= 2) {
fprintf(stderr, "Info: Disabling dup from %d to %d\n", old, new);
return 0;
} else {
return original_dup2(old, new);
}
}
int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen) {
(void)sockfd;
(void)addr;
(void)addrlen;
fprintf(stderr, "Info: Emulating accept on %d\n", sockfd);
return 0;
}
int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
(void)sockfd;
(void)addr;
(void)addrlen;
fprintf(stderr, "Info: Emulating bind on port %d\n",
ntohs(((struct sockaddr_in *)addr)->sin_port));
return 0;
}
int listen(int sockfd, int backlog) {
(void)sockfd;
(void)backlog;
return 0;
}
int setsockopt(int sockfd, int level, int optid, const void *optdata,
socklen_t optdatalen) {
(void)sockfd;
(void)level;
(void)optid;
(void)optdata;
(void)optdatalen;
return 0;
}
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