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Fix handling of answers from real dns

This commit is contained in:
Erik Ekman 2006-06-06 01:03:37 +00:00
parent 74a778fdf0
commit 5a224ee71a
2 changed files with 25 additions and 6 deletions
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17
dns.c
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@ -293,6 +293,7 @@ dns_read(int fd, char *buf, int buflen)
short rlen; short rlen;
short type; short type;
short class; short class;
short qdcount;
short ancount; short ancount;
char *data; char *data;
char name[255]; char name[255];
@ -312,10 +313,16 @@ dns_read(int fd, char *buf, int buflen)
data = packet + sizeof(HEADER); data = packet + sizeof(HEADER);
if(header->qr) { /* qr=1 => response */ if(header->qr) { /* qr=1 => response */
qdcount = ntohs(header->qdcount);
ancount = ntohs(header->ancount); ancount = ntohs(header->ancount);
rlen = 0; rlen = 0;
if(qdcount == 1) {
READNAME(packet, name, data);
READSHORT(type, data);
READSHORT(class, data);
}
if(ancount == 1) { if(ancount == 1) {
READNAME(packet, name, data); READNAME(packet, name, data);
READSHORT(type, data); READSHORT(type, data);
@ -339,10 +346,12 @@ dns_read(int fd, char *buf, int buflen)
} }
} }
if(ttl == T_NULL && rlen) if(type == T_NULL && rlen) {
memcpy(buf, rdata, rlen); memcpy(buf, rdata, rlen);
return rlen;
return rlen; } else {
return 0;
}
} }
} }

14
dnstun.c
View File

@ -47,15 +47,24 @@ tunnel(int tun_fd, int dns_fd)
{ {
int i; int i;
int read; int read;
int fastpoll;
fd_set fds; fd_set fds;
struct timeval tv; struct timeval tv;
struct tun_frame *frame; struct tun_frame *frame;
frame = malloc(FRAMESIZE); frame = malloc(FRAMESIZE);
fastpoll = 0;
while (running) { while (running) {
tv.tv_sec = 1; if (fastpoll) {
tv.tv_usec = 0; tv.tv_sec = 0;
tv.tv_usec = 5000;
fastpoll = 0;
printf("Fast poll\n");
} else {
tv.tv_sec = 1;
tv.tv_usec = 0;
}
FD_ZERO(&fds); FD_ZERO(&fds);
if (!dns_sending()) { if (!dns_sending()) {
@ -95,6 +104,7 @@ tunnel(int tun_fd, int dns_fd)
#endif #endif
write_tun(tun_fd, frame, read + 4); write_tun(tun_fd, frame, read + 4);
fastpoll = 1; // make sure we send packet real soon
} }
} }
} }