utils.c revision 5dfe556188df2a3b2bfe73c8bc3b3b9216171a93 
1/*
2 * utils.c
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 *
12 * Changes:
13 *
14 * Rani Assaf <rani@magic.metawire.com> 980929:	resolve addresses
15 */
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <unistd.h>
20#include <syslog.h>
21#include <fcntl.h>
22#include <sys/socket.h>
23#include <netinet/in.h>
24#include <string.h>
25#include <netdb.h>
26#include <arpa/inet.h>
27#include <resolv.h>
28#include <asm/types.h>
29#include <linux/pkt_sched.h>
30
31#include "utils.h"
32
33int get_integer(int *val, const char *arg, int base)
34{
35	long res;
36	char *ptr;
37
38	if (!arg || !*arg)
39		return -1;
40	res = strtol(arg, &ptr, base);
41	if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
42		return -1;
43	*val = res;
44	return 0;
45}
46
47int get_unsigned(unsigned *val, const char *arg, int base)
48{
49	unsigned long res;
50	char *ptr;
51
52	if (!arg || !*arg)
53		return -1;
54	res = strtoul(arg, &ptr, base);
55	if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
56		return -1;
57	*val = res;
58	return 0;
59}
60
61int get_u32(__u32 *val, const char *arg, int base)
62{
63	unsigned long res;
64	char *ptr;
65
66	if (!arg || !*arg)
67		return -1;
68	res = strtoul(arg, &ptr, base);
69	if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
70		return -1;
71	*val = res;
72	return 0;
73}
74
75int get_u16(__u16 *val, const char *arg, int base)
76{
77	unsigned long res;
78	char *ptr;
79
80	if (!arg || !*arg)
81		return -1;
82	res = strtoul(arg, &ptr, base);
83	if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
84		return -1;
85	*val = res;
86	return 0;
87}
88
89int get_u8(__u8 *val, const char *arg, int base)
90{
91	unsigned long res;
92	char *ptr;
93
94	if (!arg || !*arg)
95		return -1;
96	res = strtoul(arg, &ptr, base);
97	if (!ptr || ptr == arg || *ptr || res > 0xFF)
98		return -1;
99	*val = res;
100	return 0;
101}
102
103int get_s16(__s16 *val, const char *arg, int base)
104{
105	long res;
106	char *ptr;
107
108	if (!arg || !*arg)
109		return -1;
110	res = strtol(arg, &ptr, base);
111	if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
112		return -1;
113	*val = res;
114	return 0;
115}
116
117int get_s8(__s8 *val, const char *arg, int base)
118{
119	long res;
120	char *ptr;
121
122	if (!arg || !*arg)
123		return -1;
124	res = strtol(arg, &ptr, base);
125	if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
126		return -1;
127	*val = res;
128	return 0;
129}
130
131int get_addr_1(inet_prefix *addr, const char *name, int family)
132{
133	const char *cp;
134	unsigned char *ap = (unsigned char*)addr->data;
135	int i;
136
137	memset(addr, 0, sizeof(*addr));
138
139	if (strcmp(name, "default") == 0 ||
140	    strcmp(name, "all") == 0 ||
141	    strcmp(name, "any") == 0) {
142		if (family == AF_DECnet)
143			return -1;
144		addr->family = family;
145		addr->bytelen = (family == AF_INET6 ? 16 : 4);
146		addr->bitlen = -1;
147		return 0;
148	}
149
150	if (strchr(name, ':')) {
151		addr->family = AF_INET6;
152		if (family != AF_UNSPEC && family != AF_INET6)
153			return -1;
154		if (inet_pton(AF_INET6, name, addr->data) <= 0)
155			return -1;
156		addr->bytelen = 16;
157		addr->bitlen = -1;
158		return 0;
159	}
160
161	if (family == AF_DECnet) {
162		struct dn_naddr dna;
163		addr->family = AF_DECnet;
164		if (dnet_pton(AF_DECnet, name, &dna) <= 0)
165			return -1;
166		memcpy(addr->data, dna.a_addr, 2);
167		addr->bytelen = 2;
168		addr->bitlen = -1;
169		return 0;
170	}
171
172	addr->family = AF_INET;
173	if (family != AF_UNSPEC && family != AF_INET)
174		return -1;
175	addr->bytelen = 4;
176	addr->bitlen = -1;
177	for (cp=name, i=0; *cp; cp++) {
178		if (*cp <= '9' && *cp >= '0') {
179			ap[i] = 10*ap[i] + (*cp-'0');
180			continue;
181		}
182		if (*cp == '.' && ++i <= 3)
183			continue;
184		return -1;
185	}
186	return 0;
187}
188
189int get_prefix_1(inet_prefix *dst, char *arg, int family)
190{
191	int err;
192	unsigned plen;
193	char *slash;
194
195	memset(dst, 0, sizeof(*dst));
196
197	if (strcmp(arg, "default") == 0 ||
198	    strcmp(arg, "any") == 0 ||
199	    strcmp(arg, "all") == 0) {
200		if (family == AF_DECnet)
201			return -1;
202		dst->family = family;
203		dst->bytelen = 0;
204		dst->bitlen = 0;
205		return 0;
206	}
207
208	slash = strchr(arg, '/');
209	if (slash)
210		*slash = 0;
211	err = get_addr_1(dst, arg, family);
212	if (err == 0) {
213		switch(dst->family) {
214			case AF_INET6:
215				dst->bitlen = 128;
216				break;
217			case AF_DECnet:
218				dst->bitlen = 16;
219				break;
220			default:
221			case AF_INET:
222				dst->bitlen = 32;
223		}
224		if (slash) {
225			if (get_integer(&plen, slash+1, 0) || plen > dst->bitlen) {
226				err = -1;
227				goto done;
228			}
229			dst->bitlen = plen;
230		}
231	}
232done:
233	if (slash)
234		*slash = '/';
235	return err;
236}
237
238int get_addr(inet_prefix *dst, char *arg, int family)
239{
240	if (family == AF_PACKET) {
241		fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
242		exit(1);
243	}
244	if (get_addr_1(dst, arg, family)) {
245		fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
246		exit(1);
247	}
248	return 0;
249}
250
251int get_prefix(inet_prefix *dst, char *arg, int family)
252{
253	if (family == AF_PACKET) {
254		fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
255		exit(1);
256	}
257	if (get_prefix_1(dst, arg, family)) {
258		fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
259		exit(1);
260	}
261	return 0;
262}
263
264__u32 get_addr32(char *name)
265{
266	inet_prefix addr;
267	if (get_addr_1(&addr, name, AF_INET)) {
268		fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
269		exit(1);
270	}
271	return addr.data[0];
272}
273
274void incomplete_command(void)
275{
276	fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
277	exit(-1);
278}
279
280void invarg(const char *msg, const char *arg)
281{
282	fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
283	exit(-1);
284}
285
286void duparg(const char *key, const char *arg)
287{
288	fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
289	exit(-1);
290}
291
292void duparg2(const char *key, const char *arg)
293{
294	fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
295	exit(-1);
296}
297
298int matches(const char *cmd, const char *pattern)
299{
300	int len = strlen(cmd);
301	if (len > strlen(pattern))
302		return -1;
303	return memcmp(pattern, cmd, len);
304}
305
306int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
307{
308	__u32 *a1 = a->data;
309	__u32 *a2 = b->data;
310	int words = bits >> 0x05;
311
312	bits &= 0x1f;
313
314	if (words)
315		if (memcmp(a1, a2, words << 2))
316			return -1;
317
318	if (bits) {
319		__u32 w1, w2;
320		__u32 mask;
321
322		w1 = a1[words];
323		w2 = a2[words];
324
325		mask = htonl((0xffffffff) << (0x20 - bits));
326
327		if ((w1 ^ w2) & mask)
328			return 1;
329	}
330
331	return 0;
332}
333
334int __iproute2_hz_internal;
335
336int __get_hz(void)
337{
338	char name[1024];
339	int hz = 0;
340	FILE *fp;
341
342	if (getenv("HZ"))
343		return atoi(getenv("HZ")) ? : HZ;
344
345	if (getenv("PROC_NET_PSCHED")) {
346		snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
347	} else if (getenv("PROC_ROOT")) {
348		snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
349	} else {
350		strcpy(name, "/proc/net/psched");
351	}
352	fp = fopen(name, "r");
353
354	if (fp) {
355		unsigned nom, denom;
356		if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
357			if (nom == 1000000)
358				hz = denom;
359		fclose(fp);
360	}
361	if (hz)
362		return hz;
363	return HZ;
364}
365
366const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
367{
368	switch (af) {
369	case AF_INET:
370	case AF_INET6:
371		return inet_ntop(af, addr, buf, buflen);
372	case AF_IPX:
373		return ipx_ntop(af, addr, buf, buflen);
374	case AF_DECnet:
375	{
376		struct dn_naddr dna = { 2, { 0, 0, }};
377		memcpy(dna.a_addr, addr, 2);
378		return dnet_ntop(af, &dna, buf, buflen);
379	}
380	default:
381		return "???";
382	}
383}
384
385#ifdef RESOLVE_HOSTNAMES
386struct namerec
387{
388	struct namerec *next;
389	inet_prefix addr;
390	char	    *name;
391};
392
393static struct namerec *nht[256];
394
395char *resolve_address(const char *addr, int len, int af)
396{
397	struct namerec *n;
398	struct hostent *h_ent;
399	unsigned hash;
400	static int notfirst;
401
402
403	if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
404	    ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
405		af = AF_INET;
406		addr += 12;
407		len = 4;
408	}
409
410	hash = addr[len-1] ^ addr[len-2] ^ addr[len-3] ^ addr[len-4];
411
412	for (n = nht[hash]; n; n = n->next) {
413		if (n->addr.family == af &&
414		    n->addr.bytelen == len &&
415		    memcmp(n->addr.data, addr, len) == 0)
416			return n->name;
417	}
418	if ((n = malloc(sizeof(*n))) == NULL)
419		return NULL;
420	n->addr.family = af;
421	n->addr.bytelen = len;
422	n->name = NULL;
423	memcpy(n->addr.data, addr, len);
424	n->next = nht[hash];
425	nht[hash] = n;
426	if (++notfirst == 1)
427		sethostent(1);
428	fflush(stdout);
429
430	if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
431		n->name = strdup(h_ent->h_name);
432
433	/* Even if we fail, "negative" entry is remembered. */
434	return n->name;
435}
436#endif
437
438
439const char *format_host(int af, int len, const void *addr,
440			char *buf, int buflen)
441{
442#ifdef RESOLVE_HOSTNAMES
443	if (resolve_hosts) {
444		char *n;
445		if (len <= 0) {
446			switch (af) {
447			case AF_INET:
448				len = 4;
449				break;
450			case AF_INET6:
451				len = 16;
452				break;
453			case AF_IPX:
454				len = 10;
455				break;
456#ifdef AF_DECnet
457			/* I see no reasons why gethostbyname
458			   may not work for DECnet */
459			case AF_DECnet:
460				len = 2;
461				break;
462#endif
463			default: ;
464			}
465		}
466		if (len > 0 &&
467		    (n = resolve_address(addr, len, af)) != NULL)
468			return n;
469	}
470#endif
471	return rt_addr_n2a(af, len, addr, buf, buflen);
472}
473
474
475__u8* hexstring_n2a(const __u8 *str, int len, __u8 *buf, int blen)
476{
477	__u8 *ptr = buf;
478	int i;
479
480	for (i=0; i<len; i++) {
481		if (blen < 3)
482			break;
483		sprintf(ptr, "%02x", str[i]);
484		ptr += 2;
485		blen -= 2;
486		if (i != len-1 && blen > 1) {
487			*ptr++ = ':';
488			blen--;
489		}
490	}
491	return buf;
492}
493
494__u8* hexstring_a2n(const __u8 *str, __u8 *buf, int blen)
495{
496	int cnt = 0;
497
498	for (;;) {
499		unsigned acc;
500		char ch;
501
502		acc = 0;
503
504		while ((ch = *str) != ':' && ch != 0) {
505			if (ch >= '0' && ch <= '9')
506				ch -= '0';
507			else if (ch >= 'a' && ch <= 'f')
508				ch -= 'a'-10;
509			else if (ch >= 'A' && ch <= 'F')
510				ch -= 'A'-10;
511			else
512				return NULL;
513			acc = (acc<<4) + ch;
514			str++;
515		}
516
517		if (acc > 255)
518			return NULL;
519		if (cnt < blen) {
520			buf[cnt] = acc;
521			cnt++;
522		}
523		if (ch == 0)
524			break;
525		++str;
526	}
527	if (cnt < blen)
528		memset(buf+cnt, 0, blen-cnt);
529	return buf;
530}
531