1 |
/* |
2 |
* Copyright (c) 2005,2006 Christophe Fillot. |
3 |
* E-mail: cf@utc.fr |
4 |
* |
5 |
* Network Utility functions. |
6 |
*/ |
7 |
|
8 |
#define _GNU_SOURCE |
9 |
#include <stdio.h> |
10 |
#include <stdlib.h> |
11 |
#include <string.h> |
12 |
#include <stdarg.h> |
13 |
#include <unistd.h> |
14 |
#include <time.h> |
15 |
#include <sys/time.h> |
16 |
#include <sys/ioctl.h> |
17 |
#include <sys/types.h> |
18 |
#include <sys/socket.h> |
19 |
#include <arpa/inet.h> |
20 |
#include <netdb.h> |
21 |
#include <fcntl.h> |
22 |
#include <errno.h> |
23 |
#include <assert.h> |
24 |
|
25 |
#include "utils.h" |
26 |
#include "net.h" |
27 |
|
28 |
/* |
29 |
* IP mask table, which allows to find quickly a network mask |
30 |
* with a prefix length. |
31 |
*/ |
32 |
n_ip_addr_t ip_masks[N_IP_ADDR_BITS+1] = { |
33 |
0x0, |
34 |
0x80000000, 0xC0000000, 0xE0000000, 0xF0000000, |
35 |
0xF8000000, 0xFC000000, 0xFE000000, 0xFF000000, |
36 |
0xFF800000, 0xFFC00000, 0xFFE00000, 0xFFF00000, |
37 |
0xFFF80000, 0xFFFC0000, 0xFFFE0000, 0xFFFF0000, |
38 |
0xFFFF8000, 0xFFFFC000, 0xFFFFE000, 0xFFFFF000, |
39 |
0xFFFFF800, 0xFFFFFC00, 0xFFFFFE00, 0xFFFFFF00, |
40 |
0xFFFFFF80, 0xFFFFFFC0, 0xFFFFFFE0, 0xFFFFFFF0, |
41 |
0xFFFFFFF8, 0xFFFFFFFC, 0xFFFFFFFE, 0xFFFFFFFF |
42 |
}; |
43 |
|
44 |
/* |
45 |
* IPv6 mask table, which allows to find quickly a network mask |
46 |
* with a prefix length. Note this is a particularly ugly way |
47 |
* to do this, since we use statically 2 Kb. |
48 |
*/ |
49 |
n_ipv6_addr_t ipv6_masks[N_IPV6_ADDR_BITS+1]; |
50 |
|
51 |
/* Initialize IPv6 masks */ |
52 |
void ipv6_init_masks(void) |
53 |
{ |
54 |
int i,index; |
55 |
|
56 |
/* Set all bits to 1 */ |
57 |
memset(ipv6_masks,0xff,sizeof(ipv6_masks)); |
58 |
|
59 |
for(i=0;i<N_IPV6_ADDR_BITS;i++) |
60 |
{ |
61 |
index = i >> 3; /* Compute byte index (divide by 8) */ |
62 |
|
63 |
/* rotate byte */ |
64 |
ipv6_masks[i].ip6.u6_addr8[index++] <<= (8 - (i & 7)); |
65 |
|
66 |
/* clear following bytes */ |
67 |
while(index<N_IPV6_ADDR_LEN) |
68 |
ipv6_masks[i].ip6.u6_addr8[index++] = 0; |
69 |
} |
70 |
} |
71 |
|
72 |
/* Convert an IPv4 address into a string */ |
73 |
char *n_ip_ntoa(char *buffer,n_ip_addr_t ip_addr) |
74 |
{ |
75 |
u_char *p = (u_char *)&ip_addr; |
76 |
sprintf(buffer,"%u.%u.%u.%u",p[0],p[1],p[2],p[3]); |
77 |
return(buffer); |
78 |
} |
79 |
|
80 |
#if HAS_RFC2553 |
81 |
/* Convert in IPv6 address into a string */ |
82 |
char *n_ipv6_ntoa(char *buffer,n_ipv6_addr_t *ipv6_addr) |
83 |
{ |
84 |
return((char *)inet_ntop(AF_INET6,ipv6_addr,buffer,INET6_ADDRSTRLEN)); |
85 |
} |
86 |
#endif |
87 |
|
88 |
/* Convert a string containing an IP address in binary */ |
89 |
int n_ip_aton(n_ip_addr_t *ip_addr,char *ip_str) |
90 |
{ |
91 |
struct in_addr addr; |
92 |
|
93 |
if (inet_aton(ip_str,&addr) == 0) |
94 |
return(-1); |
95 |
|
96 |
*ip_addr = ntohl(addr.s_addr); |
97 |
return(0); |
98 |
} |
99 |
|
100 |
#if HAS_RFC2553 |
101 |
/* Convert an IPv6 address from string into binary */ |
102 |
int n_ipv6_aton(n_ipv6_addr_t *ipv6_addr,char *ip_str) |
103 |
{ |
104 |
return(inet_pton(AF_INET6,ip_str,ipv6_addr)); |
105 |
} |
106 |
#endif |
107 |
|
108 |
/* Parse an IPv4 CIDR prefix */ |
109 |
int ip_parse_cidr(char *token,n_ip_addr_t *net_addr,n_ip_addr_t *net_mask) |
110 |
{ |
111 |
char *sl,*tmp,*err; |
112 |
u_long mask; |
113 |
|
114 |
/* Find separator */ |
115 |
if ((sl = strchr(token,'/')) == NULL) |
116 |
return(-1); |
117 |
|
118 |
/* Get mask */ |
119 |
mask = strtoul(sl+1,&err,0); |
120 |
if (*err != 0) |
121 |
return(-1); |
122 |
|
123 |
/* Ensure that mask has a correct value */ |
124 |
if (mask > N_IP_ADDR_BITS) |
125 |
return(-1); |
126 |
|
127 |
if ((tmp = strdup(token)) == NULL) |
128 |
return(-1); |
129 |
|
130 |
sl = strchr(tmp,'/'); |
131 |
*sl = 0; |
132 |
|
133 |
/* Parse IP Address */ |
134 |
if (n_ip_aton(net_addr,tmp) == -1) { |
135 |
free(tmp); |
136 |
return(-1); |
137 |
} |
138 |
|
139 |
/* Set netmask */ |
140 |
*net_mask = ip_masks[mask]; |
141 |
|
142 |
free(tmp); |
143 |
return(0); |
144 |
} |
145 |
|
146 |
#if HAS_RFC2553 |
147 |
/* Parse an IPv6 CIDR prefix */ |
148 |
int ipv6_parse_cidr(char *token,n_ipv6_addr_t *net_addr,u_int *net_mask) |
149 |
{ |
150 |
char *sl,*tmp,*err; |
151 |
u_long mask; |
152 |
|
153 |
/* Find separator */ |
154 |
if ((sl = strchr(token,'/')) == NULL) |
155 |
return(-1); |
156 |
|
157 |
/* Get mask */ |
158 |
mask = strtoul(sl+1,&err,0); |
159 |
if (*err != 0) |
160 |
return(-1); |
161 |
|
162 |
/* Ensure that mask has a correct value */ |
163 |
if (mask > N_IPV6_ADDR_BITS) |
164 |
return(-1); |
165 |
|
166 |
if ((tmp = strdup(token)) == NULL) |
167 |
return(-1); |
168 |
|
169 |
sl = strchr(tmp,'/'); |
170 |
*sl = 0; |
171 |
|
172 |
/* Parse IP Address */ |
173 |
if (n_ipv6_aton(net_addr,tmp) <= 0) { |
174 |
free(tmp); |
175 |
return(-1); |
176 |
} |
177 |
|
178 |
/* Set netmask */ |
179 |
*net_mask = (u_int)mask; |
180 |
|
181 |
free(tmp); |
182 |
return(0); |
183 |
} |
184 |
#endif |
185 |
|
186 |
/* Parse a MAC address */ |
187 |
int parse_mac_addr(n_eth_addr_t *addr,char *str) |
188 |
{ |
189 |
u_int v[N_ETH_ALEN]; |
190 |
int i,res; |
191 |
|
192 |
/* First try, standard format (00:01:02:03:04:05) */ |
193 |
res = sscanf(str,"%x:%x:%x:%x:%x:%x",&v[0],&v[1],&v[2],&v[3],&v[4],&v[5]); |
194 |
|
195 |
if (res == 6) { |
196 |
for(i=0;i<N_ETH_ALEN;i++) |
197 |
addr->eth_addr_byte[i] = v[i]; |
198 |
return(0); |
199 |
} |
200 |
|
201 |
/* Second try, Cisco format (0001.0002.0003) */ |
202 |
res = sscanf(str,"%x.%x.%x",&v[0],&v[1],&v[2]); |
203 |
|
204 |
if (res == 3) { |
205 |
addr->eth_addr_byte[0] = (v[0] >> 8) & 0xFF; |
206 |
addr->eth_addr_byte[1] = v[0] & 0xFF; |
207 |
addr->eth_addr_byte[2] = (v[1] >> 8) & 0xFF; |
208 |
addr->eth_addr_byte[3] = v[1] & 0xFF; |
209 |
addr->eth_addr_byte[4] = (v[2] >> 8) & 0xFF; |
210 |
addr->eth_addr_byte[5] = v[2] & 0xFF; |
211 |
} |
212 |
|
213 |
return(-1); |
214 |
} |
215 |
|
216 |
/* Convert an Ethernet address into a string */ |
217 |
char *n_eth_ntoa(char *buffer,n_eth_addr_t *addr,int format) |
218 |
{ |
219 |
char *str_format; |
220 |
|
221 |
if (format == 0) { |
222 |
str_format = "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x"; |
223 |
} else { |
224 |
str_format = "%2.2x%2.2x.%2.2x%2.2x.%2.2x%2.2x"; |
225 |
} |
226 |
|
227 |
sprintf(buffer,str_format, |
228 |
addr->eth_addr_byte[0],addr->eth_addr_byte[1], |
229 |
addr->eth_addr_byte[2],addr->eth_addr_byte[3], |
230 |
addr->eth_addr_byte[4],addr->eth_addr_byte[5]); |
231 |
return(buffer); |
232 |
} |
233 |
|
234 |
#if HAS_RFC2553 |
235 |
/* Create a new socket to connect to specified host */ |
236 |
int udp_connect(int local_port,char *remote_host,int remote_port) |
237 |
{ |
238 |
struct addrinfo hints,*res,*res0; |
239 |
struct sockaddr_storage st; |
240 |
int error, sck = -1; |
241 |
char port_str[20]; |
242 |
|
243 |
memset(&hints,0,sizeof(hints)); |
244 |
hints.ai_family = PF_UNSPEC; |
245 |
hints.ai_socktype = SOCK_DGRAM; |
246 |
|
247 |
snprintf(port_str,sizeof(port_str),"%d",remote_port); |
248 |
|
249 |
if ((error = getaddrinfo(remote_host,port_str,&hints,&res0)) != 0) { |
250 |
fprintf(stderr,"%s\n",gai_strerror(error)); |
251 |
return(-1); |
252 |
} |
253 |
|
254 |
for(res=res0;res;res=res->ai_next) |
255 |
{ |
256 |
/* We want only IPv4 or IPv6 */ |
257 |
if ((res->ai_family != PF_INET) && (res->ai_family != PF_INET6)) |
258 |
continue; |
259 |
|
260 |
/* create new socket */ |
261 |
if ((sck = socket(res->ai_family,SOCK_DGRAM,res->ai_protocol)) < 0) { |
262 |
perror("udp_connect: socket"); |
263 |
continue; |
264 |
} |
265 |
|
266 |
/* bind to the local port */ |
267 |
memset(&st,0,sizeof(st)); |
268 |
|
269 |
switch(res->ai_family) { |
270 |
case PF_INET: { |
271 |
struct sockaddr_in *sin = (struct sockaddr_in *)&st; |
272 |
sin->sin_family = PF_INET; |
273 |
sin->sin_port = htons(local_port); |
274 |
break; |
275 |
} |
276 |
|
277 |
case PF_INET6: { |
278 |
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&st; |
279 |
#ifdef SIN6_LEN |
280 |
sin6->sin6_len = res->ai_addrlen; |
281 |
#endif |
282 |
sin6->sin6_family = PF_INET6; |
283 |
sin6->sin6_port = htons(local_port); |
284 |
break; |
285 |
} |
286 |
|
287 |
default: |
288 |
/* shouldn't happen */ |
289 |
close(sck); |
290 |
sck = -1; |
291 |
continue; |
292 |
} |
293 |
|
294 |
/* try to connect to remote host */ |
295 |
if (!bind(sck,(struct sockaddr *)&st,res->ai_addrlen) && |
296 |
!connect(sck,res->ai_addr,res->ai_addrlen)) |
297 |
break; |
298 |
|
299 |
close(sck); |
300 |
sck = -1; |
301 |
} |
302 |
|
303 |
freeaddrinfo(res0); |
304 |
return(sck); |
305 |
} |
306 |
#else |
307 |
/* |
308 |
* Create a new socket to connect to specified host. |
309 |
* Version for old systems that do not support RFC 2553 (getaddrinfo()) |
310 |
* |
311 |
* See http://www.faqs.org/rfcs/rfc2553.html for more info. |
312 |
*/ |
313 |
int udp_connect(int local_port,char *remote_host,int remote_port) |
314 |
{ |
315 |
struct sockaddr_in sin; |
316 |
struct hostent *hp; |
317 |
int sck; |
318 |
|
319 |
if (!(hp = gethostbyname(remote_host))) { |
320 |
fprintf(stderr,"udp_connect: unable to resolve '%s'\n",remote_host); |
321 |
return(-1); |
322 |
} |
323 |
|
324 |
if ((sck = socket(AF_INET,SOCK_DGRAM,0)) < 0) { |
325 |
perror("udp_connect: socket"); |
326 |
return(-1); |
327 |
} |
328 |
|
329 |
/* bind local port */ |
330 |
memset(&sin,0,sizeof(sin)); |
331 |
sin.sin_family = PF_INET; |
332 |
sin.sin_port = htons(local_port); |
333 |
|
334 |
if (bind(sck,(struct sockaddr *)&sin,sizeof(sin)) < 0) { |
335 |
perror("udp_connect: bind"); |
336 |
close(sck); |
337 |
} |
338 |
|
339 |
/* try to connect to remote host */ |
340 |
memset(&sin,0,sizeof(sin)); |
341 |
memcpy(&sin.sin_addr,hp->h_addr_list[0],sizeof(struct in_addr)); |
342 |
sin.sin_family = PF_INET; |
343 |
sin.sin_port = htons(remote_port); |
344 |
|
345 |
if (connect(sck,(struct sockaddr *)&sin,sizeof(sin)) < 0) { |
346 |
perror("udp_connect: connect"); |
347 |
close(sck); |
348 |
} |
349 |
|
350 |
return(sck); |
351 |
} |
352 |
#endif /* HAS_RFC2553 */ |
353 |
|
354 |
#if HAS_RFC2553 |
355 |
/* Listen on the specified port */ |
356 |
int ip_listen(int port,int sock_type,int max_fd,int fd_array[]) |
357 |
{ |
358 |
struct addrinfo hints,*res,*res0; |
359 |
char port_str[20]; |
360 |
int nsock,error,i; |
361 |
int reuse = 1; |
362 |
|
363 |
for(i=0;i<max_fd;i++) |
364 |
fd_array[i] = -1; |
365 |
|
366 |
memset(&hints,0,sizeof(hints)); |
367 |
hints.ai_family = PF_UNSPEC; |
368 |
hints.ai_socktype = sock_type; |
369 |
hints.ai_flags = AI_PASSIVE; |
370 |
|
371 |
snprintf(port_str,sizeof(port_str),"%d",port); |
372 |
|
373 |
if ((error = getaddrinfo(NULL,port_str,&hints,&res0)) != 0) { |
374 |
fprintf(stderr,"ip_listen: %s", gai_strerror(error)); |
375 |
return(-1); |
376 |
} |
377 |
|
378 |
nsock = 0; |
379 |
for(res=res0;(res && (nsock < max_fd));res=res->ai_next) |
380 |
{ |
381 |
if ((res->ai_family != PF_INET) && (res->ai_family != PF_INET6)) |
382 |
continue; |
383 |
|
384 |
fd_array[nsock] = socket(res->ai_family,res->ai_socktype, |
385 |
res->ai_protocol); |
386 |
|
387 |
if (fd_array[nsock] < 0) |
388 |
continue; |
389 |
|
390 |
setsockopt(fd_array[nsock],SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)); |
391 |
|
392 |
if ((bind(fd_array[nsock],res->ai_addr,res->ai_addrlen) < 0) || |
393 |
(listen(fd_array[nsock],5) < 0)) |
394 |
{ |
395 |
close(fd_array[nsock]); |
396 |
fd_array[nsock] = -1; |
397 |
continue; |
398 |
} |
399 |
|
400 |
nsock++; |
401 |
} |
402 |
|
403 |
freeaddrinfo(res0); |
404 |
return(nsock); |
405 |
} |
406 |
#else |
407 |
/* Listen on the specified port */ |
408 |
int ip_listen(int port,int sock_type,int max_fd,int fd_array[]) |
409 |
{ |
410 |
struct sockaddr_in sin; |
411 |
int i,sck,reuse=1; |
412 |
|
413 |
for(i=0;i<max_fd;i++) |
414 |
fd_array[i] = -1; |
415 |
|
416 |
if ((sck = socket(AF_INET,sock_type,0)) < 0) { |
417 |
perror("ip_listen: socket"); |
418 |
return(-1); |
419 |
} |
420 |
|
421 |
/* bind local port */ |
422 |
memset(&sin,0,sizeof(sin)); |
423 |
sin.sin_family = PF_INET; |
424 |
sin.sin_port = htons(port); |
425 |
|
426 |
setsockopt(fd_array[0],SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)); |
427 |
|
428 |
if (bind(sck,(struct sockaddr *)&sin,sizeof(sin)) < 0) { |
429 |
perror("ip_listen: bind"); |
430 |
goto error; |
431 |
} |
432 |
|
433 |
if (listen(sck,5) < 0) { |
434 |
perror("ip_listen: listen"); |
435 |
goto error; |
436 |
} |
437 |
|
438 |
fd_array[0] = sck; |
439 |
return(1); |
440 |
|
441 |
error: |
442 |
close(sck); |
443 |
return(-1); |
444 |
} |
445 |
#endif |