mirror of
https://github.com/yarrick/iodine.git
synced 2024-12-17 21:47:22 +00:00
Changes to allow handling of queries of type A, NS etc
This commit is contained in:
Erik Ekman
Erik Ekman
parent
3a67dfd7ce
commit
539ebb27d9
@ -150,7 +150,6 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
|
||||
warnx("Got NXDOMAIN as reply");
|
||||
break;
|
||||
|
||||
|
||||
case SERVFAIL:
|
||||
warnx("Got SERVFAIL as reply");
|
||||
break;
|
||||
@ -178,7 +177,7 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
|
||||
rv = MIN(rlen, sizeof(rdata));
|
||||
rv = readdata(packet, &data, rdata, rv);
|
||||
|
||||
if(type == T_NULL && rv > 2) {
|
||||
if(type == T_NULL && rv > 2 && buf) {
|
||||
rv = MIN(rv, buflen);
|
||||
memcpy(buf, rdata, rv);
|
||||
}
|
||||
@ -194,11 +193,6 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
|
||||
readshort(packet, &data, &type);
|
||||
readshort(packet, &data, &class);
|
||||
|
||||
if(type != T_NULL) {
|
||||
rv = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
strncpy(q->name, name, sizeof(q->name));
|
||||
q->name[sizeof(q->name) - 1] = '\0';
|
||||
q->type = type;
|
||||
|
||||
122
src/iodined.c
122
src/iodined.c
@ -34,6 +34,10 @@
|
||||
#include <netinet/in_systm.h>
|
||||
#include <netinet/ip.h>
|
||||
#include <zlib.h>
|
||||
#include <arpa/nameser.h>
|
||||
#ifdef DARWIN
|
||||
#include <arpa/nameser8_compat.h>
|
||||
#endif
|
||||
|
||||
#include "common.h"
|
||||
#include "dns.h"
|
||||
@ -57,7 +61,7 @@ static in_addr_t my_ip;
|
||||
static char *__progname;
|
||||
#endif
|
||||
|
||||
static int read_dns(int, struct query *, char *, int);
|
||||
static int read_dns(int, struct query *);
|
||||
static void write_dns(int, struct query *, char *, int);
|
||||
|
||||
static void
|
||||
@ -134,34 +138,44 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
|
||||
out[5] = ((payload >> 16) & 0xff);
|
||||
out[6] = ((payload >> 8) & 0xff);
|
||||
out[7] = ((payload) & 0xff);
|
||||
out[8] = u->id;
|
||||
if (u) {
|
||||
out[8] = u->id;
|
||||
} else {
|
||||
out[8] = 0;
|
||||
}
|
||||
|
||||
|
||||
write_dns(fd, &u->q, out, sizeof(out));
|
||||
}
|
||||
|
||||
static int
|
||||
tunnel_dns(int tun_fd, int dns_fd)
|
||||
static void
|
||||
handle_null_request(int tun_fd, int dns_fd, struct query *q)
|
||||
{
|
||||
struct in_addr tempip;
|
||||
struct user dummy;
|
||||
struct ip *hdr;
|
||||
unsigned long outlen;
|
||||
char in[64*1024];
|
||||
char logindata[16];
|
||||
char out[64*1024];
|
||||
char in[64*1024];
|
||||
char unpacked[64*1024];
|
||||
char *tmp[2];
|
||||
char *domain;
|
||||
int userid;
|
||||
int touser;
|
||||
int version;
|
||||
int read;
|
||||
int code;
|
||||
int read;
|
||||
|
||||
userid = -1;
|
||||
if ((read = read_dns(dns_fd, &(dummy.q), in, sizeof(in))) <= 0)
|
||||
return 0;
|
||||
|
||||
domain = strstr(q->name, topdomain);
|
||||
if (!domain) {
|
||||
/* Not for us, discard */
|
||||
return;
|
||||
}
|
||||
|
||||
read = (int) (domain - q->name);
|
||||
memcpy(in, q->name, MIN(read, sizeof(in)));
|
||||
|
||||
if(in[0] == 'V' || in[0] == 'v') {
|
||||
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
|
||||
/* Version greeting, compare and send ack/nak */
|
||||
@ -180,33 +194,33 @@ tunnel_dns(int tun_fd, int dns_fd)
|
||||
|
||||
users[userid].seed = rand();
|
||||
/* Store remote IP number */
|
||||
tempin = (struct sockaddr_in *) &(dummy.q.from);
|
||||
tempin = (struct sockaddr_in *) &(q->from);
|
||||
memcpy(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
|
||||
|
||||
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
|
||||
memcpy(&(users[userid].q), q, sizeof(struct query));
|
||||
users[userid].encoder = get_base32_encoder();
|
||||
send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
|
||||
users[userid].q.id = 0;
|
||||
} else {
|
||||
/* No space for another user */
|
||||
send_version_response(dns_fd, VERSION_FULL, USERS, &dummy);
|
||||
send_version_response(dns_fd, VERSION_FULL, USERS, NULL);
|
||||
}
|
||||
} else {
|
||||
send_version_response(dns_fd, VERSION_NACK, VERSION, &dummy);
|
||||
send_version_response(dns_fd, VERSION_NACK, VERSION, NULL);
|
||||
}
|
||||
} else if(in[0] == 'L' || in[0] == 'l') {
|
||||
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
|
||||
/* Login phase, handle auth */
|
||||
userid = unpacked[0];
|
||||
if (userid < 0 || userid >= USERS) {
|
||||
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
|
||||
return 0; /* illegal id */
|
||||
write_dns(dns_fd, q, "BADIP", 5);
|
||||
return; /* illegal id */
|
||||
}
|
||||
users[userid].last_pkt = time(NULL);
|
||||
login_calculate(logindata, 16, password, users[userid].seed);
|
||||
|
||||
if (check_ip && ip_cmp(userid, &(dummy.q)) != 0) {
|
||||
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
|
||||
if (check_ip && ip_cmp(userid, q) != 0) {
|
||||
write_dns(dns_fd, q, "BADIP", 5);
|
||||
} else {
|
||||
if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) {
|
||||
/* Login ok, send ip/mtu info */
|
||||
@ -219,31 +233,31 @@ tunnel_dns(int tun_fd, int dns_fd)
|
||||
read = snprintf(out, sizeof(out), "%s-%s-%d",
|
||||
tmp[0], tmp[1], my_mtu);
|
||||
|
||||
write_dns(dns_fd, &(dummy.q), out, read);
|
||||
dummy.q.id = 0;
|
||||
write_dns(dns_fd, q, out, read);
|
||||
q->id = 0;
|
||||
|
||||
free(tmp[1]);
|
||||
free(tmp[0]);
|
||||
} else {
|
||||
write_dns(dns_fd, &(dummy.q), "LNAK", 4);
|
||||
write_dns(dns_fd, q, "LNAK", 4);
|
||||
}
|
||||
}
|
||||
} else if(in[0] == 'P' || in[0] == 'p') {
|
||||
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
|
||||
/* Ping packet, store userid */
|
||||
userid = unpacked[0];
|
||||
if (userid < 0 || userid >= USERS || ip_cmp(userid, &(dummy.q)) != 0) {
|
||||
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
|
||||
return 0; /* illegal id */
|
||||
if (userid < 0 || userid >= USERS || ip_cmp(userid, q) != 0) {
|
||||
write_dns(dns_fd, q, "BADIP", 5);
|
||||
return; /* illegal id */
|
||||
}
|
||||
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
|
||||
memcpy(&(users[userid].q), q, sizeof(struct query));
|
||||
users[userid].last_pkt = time(NULL);
|
||||
} else if(in[0] == 'Z' || in[0] == 'z') {
|
||||
/* Case conservation check */
|
||||
|
||||
/* Reply with received hostname as data */
|
||||
write_dns(dns_fd, &(dummy.q), in, read);
|
||||
return 0;
|
||||
write_dns(dns_fd, q, in, read);
|
||||
return;
|
||||
} else if((in[0] >= '0' && in[0] <= '9')
|
||||
|| (in[0] >= 'a' && in[0] <= 'f')
|
||||
|| (in[0] >= 'A' && in[0] <= 'F')) {
|
||||
@ -256,20 +270,20 @@ tunnel_dns(int tun_fd, int dns_fd)
|
||||
|
||||
userid = code >> 1;
|
||||
if (userid < 0 || userid >= USERS) {
|
||||
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
|
||||
return 0; /* illegal id */
|
||||
write_dns(dns_fd, q, "BADIP", 5);
|
||||
return; /* illegal id */
|
||||
}
|
||||
|
||||
/* Check sending ip number */
|
||||
if (check_ip && ip_cmp(userid, &(dummy.q)) != 0) {
|
||||
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
|
||||
if (check_ip && ip_cmp(userid, q) != 0) {
|
||||
write_dns(dns_fd, q, "BADIP", 5);
|
||||
} else {
|
||||
/* decode with this users encoding */
|
||||
read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1,
|
||||
users[userid].encoder);
|
||||
|
||||
users[userid].last_pkt = time(NULL);
|
||||
memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
|
||||
memcpy(&(users[userid].q), q, sizeof(struct query));
|
||||
memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, unpacked, read);
|
||||
users[userid].inpacket.len += read;
|
||||
users[userid].inpacket.offset += read;
|
||||
@ -298,11 +312,29 @@ tunnel_dns(int tun_fd, int dns_fd)
|
||||
}
|
||||
}
|
||||
/* userid must be set for a reply to be sent */
|
||||
if (userid >= 0 && userid < USERS && ip_cmp(userid, &(dummy.q)) == 0 && users[userid].outpacket.len > 0) {
|
||||
write_dns(dns_fd, &(dummy.q), users[userid].outpacket.data, users[userid].outpacket.len);
|
||||
if (userid >= 0 && userid < USERS && ip_cmp(userid, q) == 0 && users[userid].outpacket.len > 0) {
|
||||
write_dns(dns_fd, q, users[userid].outpacket.data, users[userid].outpacket.len);
|
||||
users[userid].outpacket.len = 0;
|
||||
users[userid].q.id = 0;
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
tunnel_dns(int tun_fd, int dns_fd)
|
||||
{
|
||||
struct query q;
|
||||
int read;
|
||||
|
||||
if ((read = read_dns(dns_fd, &q)) <= 0)
|
||||
return 0;
|
||||
|
||||
switch (q.type) {
|
||||
case T_NULL:
|
||||
handle_null_request(tun_fd, dns_fd, &q);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -363,36 +395,28 @@ tunnel(int tun_fd, int dns_fd)
|
||||
}
|
||||
|
||||
static int
|
||||
read_dns(int fd, struct query *q, char *buf, int buflen)
|
||||
read_dns(int fd, struct query *q)
|
||||
{
|
||||
struct sockaddr_in from;
|
||||
char packet[64*1024];
|
||||
char *domain;
|
||||
socklen_t addrlen;
|
||||
int rv;
|
||||
int r;
|
||||
|
||||
addrlen = sizeof(struct sockaddr);
|
||||
r = recvfrom(fd, packet, sizeof(packet), 0, (struct sockaddr*)&from, &addrlen);
|
||||
|
||||
if (r > 0) {
|
||||
dns_decode(buf, buflen, q, QR_QUERY, packet, r);
|
||||
domain = strstr(q->name, topdomain);
|
||||
if (domain) {
|
||||
rv = (int) (domain - q->name);
|
||||
memcpy(buf, q->name, MIN(rv, buflen));
|
||||
q->fromlen = addrlen;
|
||||
memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
|
||||
} else {
|
||||
rv = 0;
|
||||
}
|
||||
dns_decode(NULL, 0, q, QR_QUERY, packet, r);
|
||||
memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
|
||||
q->fromlen = addrlen;
|
||||
|
||||
return strlen(q->name);
|
||||
} else if (r < 0) {
|
||||
/* Error */
|
||||
warn("read dns");
|
||||
rv = 0;
|
||||
}
|
||||
|
||||
return rv;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user