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Add that missing new source file

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This commit is contained in:
Nalin Dahyabhai 2013-07-19 15:57:21 -04:00
parent 36dbacb706
commit 95ad45214d
2 changed files with 87 additions and 0 deletions
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1
.gitignore vendored
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@ -90,3 +90,4 @@ krb5-1.8.3-pdf.tar.gz
/krb5-1.11.3.tar.gz
/krb5-1.11.3.tar.gz.asc
/krb5-1.11.3-pdf.tar.xz
/nss_wrapper.tar.bz2

86
noport53.c Normal file
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@ -0,0 +1,86 @@
#define _GNU_SOURCE
#include <sys/socket.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdlib.h>
#include <netinet/in.h>
int
connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
{
unsigned short port;
static int (*next_connect)(int, const struct sockaddr *, socklen_t);
if (next_connect == NULL) {
next_connect = dlsym(RTLD_NEXT, "connect");
if (next_connect == NULL) {
errno = ENOSYS;
return -1;
}
}
if (getenv("NOPORT53") == NULL) {
return next_connect(sockfd, addr, addrlen);
}
switch (addr->sa_family) {
case AF_INET:
port = ntohs(((struct sockaddr_in *)addr)->sin_port);
if (port == 53) {
errno = ECONNREFUSED;
return -1;
}
break;
case AF_INET6:
port = ntohs(((struct sockaddr_in6 *)addr)->sin6_port);
if (port == 53) {
errno = ECONNREFUSED;
return -1;
}
break;
default:
break;
}
return next_connect(sockfd, addr, addrlen);
}
ssize_t
sendto(int sockfd, const void *buf, size_t len, int flags,
const struct sockaddr *dest_addr, socklen_t addrlen)
{
unsigned short port;
static int (*next_sendto)(int, const void *, size_t, int,
const struct sockaddr *, socklen_t);
if (next_sendto == NULL) {
next_sendto = dlsym(RTLD_NEXT, "sendto");
if (next_sendto == NULL) {
errno = ENOSYS;
return -1;
}
}
if (getenv("NOPORT53") == NULL) {
return next_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
}
switch (dest_addr->sa_family) {
case AF_INET:
port = ntohs(((struct sockaddr_in *)dest_addr)->sin_port);
if (port == 53) {
errno = ECONNREFUSED;
return -1;
}
break;
case AF_INET6:
port = ntohs(((struct sockaddr_in6 *)dest_addr)->sin6_port);
if (port == 53) {
errno = ECONNREFUSED;
return -1;
}
break;
default:
break;
}
return next_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
}