mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-22 16:19:20 +02:00
remove temp
This commit is contained in:
Erik Ekman
parent
ed9d4e7de1
commit
e5d35b57bc
363
mdns.c
363
mdns.c
|
|
@ -1,363 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>
|
||||
*
|
||||
* Permission to use, copy, modify, and distribute this software for any
|
||||
* purpose with or without fee is hereby granted, provided that the above
|
||||
* copyright notice and this permission notice appear in all copies.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <arpa/nameser.h>
|
||||
#include <time.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <ctype.h>
|
||||
|
||||
#include "mdns.h"
|
||||
|
||||
#define MAX_PACKET_LEN 1024
|
||||
|
||||
struct servicetree services = RB_INITIALIZER(&services);
|
||||
|
||||
int
|
||||
servicecmp(struct mdns_service *a, struct mdns_service *b)
|
||||
{
|
||||
return strcmp(a->net, b->net);
|
||||
}
|
||||
|
||||
RB_GENERATE(servicetree, mdns_service, entry, servicecmp);
|
||||
|
||||
extern void peer_event(int, struct mdns_peer*);
|
||||
|
||||
void
|
||||
mdns_register_service(struct mdns_service *service)
|
||||
{
|
||||
RB_INSERT(servicetree, &services, service);
|
||||
}
|
||||
|
||||
void
|
||||
mdns_unregister_service(struct mdns_service *service)
|
||||
{
|
||||
if(service) {
|
||||
RB_REMOVE(servicetree, &services, service);
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
readname(char *packet, char *dst, char *src)
|
||||
{
|
||||
char l;
|
||||
int len;
|
||||
int offset;
|
||||
|
||||
len = 0;
|
||||
|
||||
while(*src) {
|
||||
l = *src++;
|
||||
len++;
|
||||
|
||||
if(l & 0x80 && l & 0x40) {
|
||||
offset = ((src[-1] & 0x3f) << 8) | src[0];
|
||||
readname(packet, dst, packet + offset);
|
||||
dst += strlen(dst);
|
||||
break;
|
||||
}
|
||||
|
||||
while(l) {
|
||||
*dst++ = *src++;
|
||||
l--;
|
||||
len++;
|
||||
}
|
||||
|
||||
*dst++ = '.';
|
||||
}
|
||||
|
||||
*dst = '\0';
|
||||
src++;
|
||||
len++;
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
#define READNAME(packet, dst, src) (src) += readname((packet), (dst), (src));
|
||||
|
||||
#define READSHORT(dst, src) \
|
||||
(dst) = ntohs(*(short*)(src)); (src)+=2;
|
||||
|
||||
#define READLONG(dst, src) \
|
||||
(dst) = ntohl(*(long*)(src)); (src)+=4;
|
||||
|
||||
#define READDATA(dst, src, len) \
|
||||
memcpy((dst), (src), (len)); (src)+=(len);
|
||||
|
||||
int
|
||||
mdns_open()
|
||||
{
|
||||
int fd;
|
||||
int ttl;
|
||||
int flag;
|
||||
struct sockaddr_in addr;
|
||||
struct ip_mreq mc;
|
||||
|
||||
bzero(&addr, sizeof(addr));
|
||||
addr.sin_family = AF_INET;
|
||||
addr.sin_port = htons(5353);
|
||||
addr.sin_addr.s_addr = 0;
|
||||
|
||||
fd = socket(AF_INET, SOCK_DGRAM, 0);
|
||||
if(fd < 0) {
|
||||
perror("socket");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
flag = 1;
|
||||
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &flag, sizeof(flag));
|
||||
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
|
||||
|
||||
if(bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
|
||||
perror("bind");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
mc.imr_multiaddr.s_addr = inet_addr("224.0.0.251");
|
||||
mc.imr_interface.s_addr = inet_addr("192.168.7.208"); //htonl(INADDR_ANY);
|
||||
if(setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mc, sizeof(mc)) < 0) {
|
||||
perror("ip_add_membership");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
ttl = 255;
|
||||
setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl));
|
||||
|
||||
return fd;
|
||||
}
|
||||
|
||||
static int
|
||||
host2dns(const char *host, char *buffer, int size)
|
||||
{
|
||||
char *h;
|
||||
char *p;
|
||||
char *word;
|
||||
|
||||
h = strdup(host);
|
||||
memset(buffer, 0, size);
|
||||
p = buffer;
|
||||
|
||||
word = strtok(h, ".");
|
||||
while(word) {
|
||||
*p++ = (char)strlen(word);
|
||||
memcpy(p, word, strlen(word));
|
||||
p += strlen(word);
|
||||
|
||||
word = strtok(NULL, ".");
|
||||
}
|
||||
|
||||
*p++ = 0;
|
||||
|
||||
free(h);
|
||||
|
||||
return p - buffer;
|
||||
}
|
||||
|
||||
static void
|
||||
mdns_respond(int fd, struct mdns_service *service)
|
||||
{
|
||||
int len;
|
||||
int size;
|
||||
HEADER *header;
|
||||
char *p;
|
||||
int addrlen;
|
||||
char buf[1024];
|
||||
char host[256];
|
||||
struct sockaddr_in addr;
|
||||
|
||||
snprintf(host, sizeof(host), "%s.%s", service->name, service->net);
|
||||
|
||||
memset(buf, 0, sizeof(buf));
|
||||
|
||||
len = 0;
|
||||
header = (HEADER*)buf;
|
||||
|
||||
header->id = 0;
|
||||
header->qr = 1;
|
||||
header->opcode = 0;
|
||||
header->aa = 1;
|
||||
header->tc = 0;
|
||||
header->rd = 0;
|
||||
header->ra = 0;
|
||||
|
||||
header->ancount = htons(2);
|
||||
|
||||
p = buf + sizeof(HEADER);
|
||||
|
||||
p += host2dns(service->net, p, strlen(service->net));
|
||||
PUTSHORT(T_PTR, p);
|
||||
PUTSHORT(C_IN, p);
|
||||
PUTLONG(htons(3600), p);
|
||||
|
||||
size = host2dns(host, p+2, strlen(host));
|
||||
PUTSHORT(size, p);
|
||||
p += size;
|
||||
|
||||
p += host2dns(host, p, strlen(host));
|
||||
PUTSHORT(T_SRV, p);
|
||||
PUTSHORT(0x8001, p);
|
||||
PUTLONG(service->ttl, p);
|
||||
|
||||
size = host2dns(service->host, p+8, strlen(service->host));
|
||||
size += 6;
|
||||
PUTSHORT(size, p);
|
||||
PUTSHORT(0, p);
|
||||
PUTSHORT(0, p);
|
||||
PUTSHORT(service->port, p);
|
||||
p+= size;
|
||||
|
||||
bzero(&addr, sizeof(addr));
|
||||
addr.sin_family = AF_INET;
|
||||
addr.sin_addr.s_addr = inet_addr("224.0.0.251");
|
||||
addr.sin_port = htons(5353);
|
||||
addrlen = sizeof(addr);
|
||||
|
||||
len = p - buf;
|
||||
sendto(fd, buf, len + 1, 0, (struct sockaddr*)&addr, addrlen);
|
||||
}
|
||||
|
||||
void
|
||||
mdns_handle(int fd)
|
||||
{
|
||||
int i;
|
||||
int ssize;
|
||||
long ttl;
|
||||
short rlen;
|
||||
short type;
|
||||
short class;
|
||||
short ancount;
|
||||
short qdcount;
|
||||
char *data;
|
||||
char name[255];
|
||||
char rdata[256];
|
||||
HEADER *header;
|
||||
struct mdns_peer *peer;
|
||||
struct sockaddr_in from;
|
||||
char buf[MAX_PACKET_LEN];
|
||||
|
||||
i = recvfrom(fd, buf, MAX_PACKET_LEN, 0, (struct sockaddr*)&from, &ssize);
|
||||
|
||||
if(i == -1) {
|
||||
perror("recvfrom");
|
||||
} else {
|
||||
header = (HEADER*)buf;
|
||||
|
||||
data = buf + sizeof(HEADER);
|
||||
|
||||
if(header->qr) { /* qr=1 => response */
|
||||
peer = malloc(sizeof(struct mdns_peer));
|
||||
ancount = ntohs(header->ancount);
|
||||
|
||||
for(i=0;i<ancount;i++) {
|
||||
READNAME(buf, name, data);
|
||||
READSHORT(type, data);
|
||||
READSHORT(class, data);
|
||||
READLONG(ttl, data);
|
||||
READSHORT(rlen, data);
|
||||
READDATA(rdata, data, rlen);
|
||||
|
||||
if(type == T_SRV && rlen > 6) {
|
||||
char *r;
|
||||
short priority;
|
||||
short weight;
|
||||
|
||||
r = rdata;
|
||||
|
||||
peer->name = strdup(name);
|
||||
peer->host = malloc(rlen);
|
||||
peer->ttl = ttl;
|
||||
|
||||
READSHORT(priority, r);
|
||||
READSHORT(weight, r);
|
||||
READSHORT(peer->port, r);
|
||||
READNAME(buf, peer->host, r);
|
||||
peer->host[strlen(peer->host)-1] = '\0';
|
||||
|
||||
peer_event(1, peer);
|
||||
}
|
||||
}
|
||||
} else { /* qr=0 => query */
|
||||
qdcount = ntohs(header->qdcount);
|
||||
|
||||
for(i=0;i<qdcount;i++) {
|
||||
READNAME(buf, name, data);
|
||||
READSHORT(type, data);
|
||||
READSHORT(class, data);
|
||||
|
||||
if(type == T_PTR) {
|
||||
struct mdns_service needle;
|
||||
struct mdns_service *service;
|
||||
|
||||
needle.net = name;
|
||||
|
||||
service = RB_FIND(servicetree, &services, &needle);
|
||||
|
||||
if(service && strcmp(service->net, name) == 0) {
|
||||
mdns_respond(fd, service);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
mdns_query(int fd, char *host, int type)
|
||||
{
|
||||
char *p;
|
||||
int len;
|
||||
int addrlen;
|
||||
char buf[1024];
|
||||
HEADER *header;
|
||||
struct sockaddr_in addr;
|
||||
|
||||
len = 0;
|
||||
memset(buf, 0, sizeof(buf));
|
||||
|
||||
header = (HEADER*)buf;
|
||||
|
||||
header->id = 0;
|
||||
header->qr = 0;
|
||||
header->opcode = 0;
|
||||
header->aa = 0;
|
||||
header->tc = 0;
|
||||
header->rd = 0;
|
||||
header->ra = 0;
|
||||
|
||||
header->qdcount = htons(1);
|
||||
|
||||
p = buf + sizeof(HEADER);
|
||||
p += host2dns(host, p, strlen(host));
|
||||
|
||||
PUTSHORT(type, p);
|
||||
PUTSHORT(01, p);
|
||||
|
||||
bzero(&addr, sizeof(addr));
|
||||
addr.sin_family = AF_INET;
|
||||
addr.sin_addr.s_addr = inet_addr("224.0.0.251");
|
||||
addr.sin_port = htons(5353);
|
||||
addrlen = sizeof(addr);
|
||||
|
||||
len = p - buf;
|
||||
sendto(fd, buf, len+1, 0, (struct sockaddr*)&addr, addrlen);
|
||||
}
|
||||
|
||||
50
mdns.h
50
mdns.h
|
|
@ -1,50 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2006 Bjorn Andersson <flex@kryo.se>
|
||||
*
|
||||
* Permission to use, copy, modify, and distribute this software for any
|
||||
* purpose with or without fee is hereby granted, provided that the above
|
||||
* copyright notice and this permission notice appear in all copies.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
|
||||
#ifndef __MDNS_H__
|
||||
#define __MDNS_H__
|
||||
|
||||
#include <sys/tree.h>
|
||||
|
||||
struct mdns_peer {
|
||||
RB_ENTRY(mdns_peer) entry;
|
||||
|
||||
char *name;
|
||||
char *host;
|
||||
short port;
|
||||
short ttl;
|
||||
};
|
||||
|
||||
struct mdns_service {
|
||||
RB_ENTRY(mdns_service) entry;
|
||||
|
||||
char *name;
|
||||
char *net;
|
||||
char *host;
|
||||
short port;
|
||||
short ttl;
|
||||
};
|
||||
|
||||
RB_HEAD(servicetree, mdns_service);
|
||||
|
||||
int mdns_open();
|
||||
void mdns_query(int, char*, int);
|
||||
void mdns_handle(int);
|
||||
|
||||
void mdns_register_service(struct mdns_service *);
|
||||
void mdns_unregister_service(struct mdns_service *);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue