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https://github.com/yarrick/iodine.git
synced 2024-12-22 13:23:32 +02:00
Changes to allow handling of queries of type A, NS etc
This commit is contained in:
Erik Ekman
Erik Ekman
parent
3a67dfd7ce
commit
539ebb27d9
2 changed files with 74 additions and 56 deletions
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@ -150,7 +150,6 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
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warnx("Got NXDOMAIN as reply");
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break;
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case SERVFAIL:
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warnx("Got SERVFAIL as reply");
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break;
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@ -178,7 +177,7 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
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rv = MIN(rlen, sizeof(rdata));
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rv = readdata(packet, &data, rdata, rv);
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if(type == T_NULL && rv > 2) {
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if(type == T_NULL && rv > 2 && buf) {
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rv = MIN(rv, buflen);
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memcpy(buf, rdata, rv);
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}
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@ -194,11 +193,6 @@ dns_decode(char *buf, size_t buflen, struct query *q, qr_t qr, char *packet, siz
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readshort(packet, &data, &type);
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readshort(packet, &data, &class);
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if(type != T_NULL) {
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rv = 0;
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break;
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}
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strncpy(q->name, name, sizeof(q->name));
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q->name[sizeof(q->name) - 1] = '\0';
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q->type = type;
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122
src/iodined.c
122
src/iodined.c
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@ -34,6 +34,10 @@
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <zlib.h>
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#include <arpa/nameser.h>
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#ifdef DARWIN
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#include <arpa/nameser8_compat.h>
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#endif
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#include "common.h"
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#include "dns.h"
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@ -57,7 +61,7 @@ static in_addr_t my_ip;
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static char *__progname;
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#endif
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static int read_dns(int, struct query *, char *, int);
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static int read_dns(int, struct query *);
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static void write_dns(int, struct query *, char *, int);
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static void
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@ -134,34 +138,44 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
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out[5] = ((payload >> 16) & 0xff);
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out[6] = ((payload >> 8) & 0xff);
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out[7] = ((payload) & 0xff);
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out[8] = u->id;
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if (u) {
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out[8] = u->id;
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} else {
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out[8] = 0;
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}
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write_dns(fd, &u->q, out, sizeof(out));
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}
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static int
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tunnel_dns(int tun_fd, int dns_fd)
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static void
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handle_null_request(int tun_fd, int dns_fd, struct query *q)
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{
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struct in_addr tempip;
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struct user dummy;
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struct ip *hdr;
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unsigned long outlen;
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char in[64*1024];
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char logindata[16];
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char out[64*1024];
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char in[64*1024];
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char unpacked[64*1024];
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char *tmp[2];
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char *domain;
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int userid;
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int touser;
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int version;
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int read;
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int code;
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int read;
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userid = -1;
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if ((read = read_dns(dns_fd, &(dummy.q), in, sizeof(in))) <= 0)
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return 0;
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domain = strstr(q->name, topdomain);
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if (!domain) {
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/* Not for us, discard */
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return;
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}
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read = (int) (domain - q->name);
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memcpy(in, q->name, MIN(read, sizeof(in)));
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if(in[0] == 'V' || in[0] == 'v') {
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
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/* Version greeting, compare and send ack/nak */
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@ -180,33 +194,33 @@ tunnel_dns(int tun_fd, int dns_fd)
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users[userid].seed = rand();
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/* Store remote IP number */
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tempin = (struct sockaddr_in *) &(dummy.q.from);
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tempin = (struct sockaddr_in *) &(q->from);
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memcpy(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
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memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
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memcpy(&(users[userid].q), q, sizeof(struct query));
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users[userid].encoder = get_base32_encoder();
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send_version_response(dns_fd, VERSION_ACK, users[userid].seed, &users[userid]);
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users[userid].q.id = 0;
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} else {
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/* No space for another user */
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send_version_response(dns_fd, VERSION_FULL, USERS, &dummy);
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send_version_response(dns_fd, VERSION_FULL, USERS, NULL);
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}
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} else {
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send_version_response(dns_fd, VERSION_NACK, VERSION, &dummy);
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send_version_response(dns_fd, VERSION_NACK, VERSION, NULL);
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}
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} else if(in[0] == 'L' || in[0] == 'l') {
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
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/* Login phase, handle auth */
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userid = unpacked[0];
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if (userid < 0 || userid >= USERS) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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return 0; /* illegal id */
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write_dns(dns_fd, q, "BADIP", 5);
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return; /* illegal id */
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}
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users[userid].last_pkt = time(NULL);
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login_calculate(logindata, 16, password, users[userid].seed);
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if (check_ip && ip_cmp(userid, &(dummy.q)) != 0) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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if (check_ip && ip_cmp(userid, q) != 0) {
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write_dns(dns_fd, q, "BADIP", 5);
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} else {
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if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) {
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/* Login ok, send ip/mtu info */
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@ -219,31 +233,31 @@ tunnel_dns(int tun_fd, int dns_fd)
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read = snprintf(out, sizeof(out), "%s-%s-%d",
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tmp[0], tmp[1], my_mtu);
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write_dns(dns_fd, &(dummy.q), out, read);
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dummy.q.id = 0;
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write_dns(dns_fd, q, out, read);
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q->id = 0;
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free(tmp[1]);
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free(tmp[0]);
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} else {
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write_dns(dns_fd, &(dummy.q), "LNAK", 4);
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write_dns(dns_fd, q, "LNAK", 4);
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}
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}
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} else if(in[0] == 'P' || in[0] == 'p') {
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1, b32);
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/* Ping packet, store userid */
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userid = unpacked[0];
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if (userid < 0 || userid >= USERS || ip_cmp(userid, &(dummy.q)) != 0) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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return 0; /* illegal id */
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if (userid < 0 || userid >= USERS || ip_cmp(userid, q) != 0) {
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write_dns(dns_fd, q, "BADIP", 5);
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return; /* illegal id */
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}
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memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
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memcpy(&(users[userid].q), q, sizeof(struct query));
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users[userid].last_pkt = time(NULL);
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} else if(in[0] == 'Z' || in[0] == 'z') {
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/* Case conservation check */
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/* Reply with received hostname as data */
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write_dns(dns_fd, &(dummy.q), in, read);
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return 0;
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write_dns(dns_fd, q, in, read);
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return;
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} else if((in[0] >= '0' && in[0] <= '9')
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|| (in[0] >= 'a' && in[0] <= 'f')
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|| (in[0] >= 'A' && in[0] <= 'F')) {
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@ -256,20 +270,20 @@ tunnel_dns(int tun_fd, int dns_fd)
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userid = code >> 1;
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if (userid < 0 || userid >= USERS) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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return 0; /* illegal id */
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write_dns(dns_fd, q, "BADIP", 5);
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return; /* illegal id */
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}
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/* Check sending ip number */
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if (check_ip && ip_cmp(userid, &(dummy.q)) != 0) {
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write_dns(dns_fd, &(dummy.q), "BADIP", 5);
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if (check_ip && ip_cmp(userid, q) != 0) {
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write_dns(dns_fd, q, "BADIP", 5);
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} else {
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/* decode with this users encoding */
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), read - 1,
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users[userid].encoder);
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users[userid].last_pkt = time(NULL);
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memcpy(&(users[userid].q), &(dummy.q), sizeof(struct query));
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memcpy(&(users[userid].q), q, sizeof(struct query));
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memcpy(users[userid].inpacket.data + users[userid].inpacket.offset, unpacked, read);
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users[userid].inpacket.len += read;
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users[userid].inpacket.offset += read;
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@ -298,11 +312,29 @@ tunnel_dns(int tun_fd, int dns_fd)
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}
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}
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/* userid must be set for a reply to be sent */
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if (userid >= 0 && userid < USERS && ip_cmp(userid, &(dummy.q)) == 0 && users[userid].outpacket.len > 0) {
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write_dns(dns_fd, &(dummy.q), users[userid].outpacket.data, users[userid].outpacket.len);
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if (userid >= 0 && userid < USERS && ip_cmp(userid, q) == 0 && users[userid].outpacket.len > 0) {
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write_dns(dns_fd, q, users[userid].outpacket.data, users[userid].outpacket.len);
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users[userid].outpacket.len = 0;
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users[userid].q.id = 0;
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}
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}
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static int
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tunnel_dns(int tun_fd, int dns_fd)
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{
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struct query q;
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int read;
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if ((read = read_dns(dns_fd, &q)) <= 0)
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return 0;
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switch (q.type) {
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case T_NULL:
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handle_null_request(tun_fd, dns_fd, &q);
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break;
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default:
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break;
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}
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return 0;
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}
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@ -363,36 +395,28 @@ tunnel(int tun_fd, int dns_fd)
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}
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static int
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read_dns(int fd, struct query *q, char *buf, int buflen)
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read_dns(int fd, struct query *q)
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{
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struct sockaddr_in from;
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char packet[64*1024];
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char *domain;
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socklen_t addrlen;
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int rv;
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int r;
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addrlen = sizeof(struct sockaddr);
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r = recvfrom(fd, packet, sizeof(packet), 0, (struct sockaddr*)&from, &addrlen);
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if (r > 0) {
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dns_decode(buf, buflen, q, QR_QUERY, packet, r);
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domain = strstr(q->name, topdomain);
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if (domain) {
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rv = (int) (domain - q->name);
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memcpy(buf, q->name, MIN(rv, buflen));
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q->fromlen = addrlen;
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memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
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} else {
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rv = 0;
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}
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dns_decode(NULL, 0, q, QR_QUERY, packet, r);
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memcpy((struct sockaddr*)&q->from, (struct sockaddr*)&from, addrlen);
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q->fromlen = addrlen;
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return strlen(q->name);
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} else if (r < 0) {
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/* Error */
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warn("read dns");
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rv = 0;
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}
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return rv;
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return 0;
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}
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static void
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