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add filtering on send flags

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This commit is contained in:
hugoc 2024-02-01 23:16:39 +01:00
parent 5660aea02e
commit 14c35dd7e9
1 changed files with 41 additions and 1 deletions
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42
src/libproxychains.c
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@ -1169,6 +1169,20 @@ HOOKFUNC(ssize_t, sendto, int sockfd, const void *buf, size_t len, int flags,
};
if(v6) memcpy(&addr6.sin6_addr.s6_addr, relay_chain->head->bnd_addr.addr.v6, 16);
//Drop the MSG_DONTROUTE flag if it exists
if(flags & MSG_DONTROUTE){
proxychains_write_log(LOG_PREFIX "dropping MSG_DONTROUTE flag\n");
flags ^= MSG_DONTROUTE;
}
//Return EOPNOTSUPP if flag MSG_MORE is set
//TODO: implement MSG_MORE logic so that data from multiple sendto calls can be merged into one UDP datagram and sent to the SOCKS
if(flags & MSG_MORE){
PDEBUG("error, MSG_MORE not yet supported\n");
errno = EOPNOTSUPP;
return -1;
}
int sent = 0;
sent = true_sendto(sockfd, send_buffer, send_buffer_len, flags, (struct sockaddr*)(v6?(void*)&addr6:(void*)&addr), v6?sizeof(addr6):sizeof(addr));
@ -1374,6 +1388,19 @@ HOOKFUNC(ssize_t, sendmsg, int sockfd, const struct msghdr *msg, int flags){
//send it
//Drop the MSG_DONTROUTE flag if it exists
if(flags & MSG_DONTROUTE){
proxychains_write_log(LOG_PREFIX "dropping MSG_DONTROUTE flag\n");
flags ^= MSG_DONTROUTE;
}
//Return EOPNOTSUPP if flag MSG_MORE is set
//TODO: implement MSG_MORE logic so that data from multiple sendto calls can be merged into one UDP datagram and sent to the SOCKS
if(flags & MSG_MORE){
PDEBUG("error, MSG_MORE not yet supported\n");
errno = EOPNOTSUPP;
return -1;
}
int sent = 0;
sent = true_sendmsg(sockfd, &tmp_msg, flags);
if(-1 == sent){
@ -1641,6 +1668,19 @@ HOOKFUNC(int, sendmmsg, int sockfd, struct mmsghdr* msgvec, unsigned int vlen, i
}
//Drop the MSG_DONTROUTE flag if it exists
if(flags & MSG_DONTROUTE){
proxychains_write_log(LOG_PREFIX "dropping MSG_DONTROUTE flag\n");
flags ^= MSG_DONTROUTE;
}
//Return EOPNOTSUPP if flag MSG_MORE is set
//TODO: implement MSG_MORE logic so that data from multiple sendto calls can be merged into one UDP datagram and sent to the SOCKS
if(flags & MSG_MORE){
PDEBUG("error, MSG_MORE not yet supported\n");
errno = EOPNOTSUPP;
return -1;
}
nmsg = true_sendmmsg(sockfd, tmp_msgvec, vlen, flags);
if(nmsg == -1){
@ -1905,7 +1945,7 @@ HOOKFUNC(ssize_t, recvfrom, int sockfd, void *buf, size_t len, int flags,
struct sockaddr_storage from;
socklen_t from_len = sizeof(from);
bytes_received = true_recvfrom(sockfd, tmp_buffer, sizeof(tmp_buffer), 0, (struct sockaddr*)&from, &from_len);
bytes_received = true_recvfrom(sockfd, tmp_buffer, sizeof(tmp_buffer), flags, (struct sockaddr*)&from, &from_len);
if(-1 == bytes_received){
PDEBUG("true_recvfrom returned -1\n");
return -1;