utils.c revision f082b64fb40b467bc1f9e5d245114aae4e256d5c 
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_u64(__u64 *val, const char *arg, int base)
62{
63	unsigned long long res;
64	char *ptr;
65
66	if (!arg || !*arg)
67		return -1;
68	res = strtoull(arg, &ptr, base);
69	if (!ptr || ptr == arg || *ptr || res == 0xFFFFFFFFULL)
70 		return -1;
71 	*val = res;
72 	return 0;
73}
74
75int get_u32(__u32 *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 > 0xFFFFFFFFUL)
84		return -1;
85	*val = res;
86	return 0;
87}
88
89int get_u16(__u16 *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 > 0xFFFF)
98		return -1;
99	*val = res;
100	return 0;
101}
102
103int get_u8(__u8 *val, const char *arg, int base)
104{
105	unsigned long res;
106	char *ptr;
107
108	if (!arg || !*arg)
109		return -1;
110	res = strtoul(arg, &ptr, base);
111	if (!ptr || ptr == arg || *ptr || res > 0xFF)
112		return -1;
113	*val = res;
114	return 0;
115}
116
117int get_s16(__s16 *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 > 0x7FFF || res < -0x8000)
126		return -1;
127	*val = res;
128	return 0;
129}
130
131int get_s8(__s8 *val, const char *arg, int base)
132{
133	long res;
134	char *ptr;
135
136	if (!arg || !*arg)
137		return -1;
138	res = strtol(arg, &ptr, base);
139	if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
140		return -1;
141	*val = res;
142	return 0;
143}
144
145int get_addr_1(inet_prefix *addr, const char *name, int family)
146{
147	const char *cp;
148	unsigned char *ap = (unsigned char*)addr->data;
149	int i;
150
151	memset(addr, 0, sizeof(*addr));
152
153	if (strcmp(name, "default") == 0 ||
154	    strcmp(name, "all") == 0 ||
155	    strcmp(name, "any") == 0) {
156		if (family == AF_DECnet)
157			return -1;
158		addr->family = family;
159		addr->bytelen = (family == AF_INET6 ? 16 : 4);
160		addr->bitlen = -1;
161		return 0;
162	}
163
164	if (strchr(name, ':')) {
165		addr->family = AF_INET6;
166		if (family != AF_UNSPEC && family != AF_INET6)
167			return -1;
168		if (inet_pton(AF_INET6, name, addr->data) <= 0)
169			return -1;
170		addr->bytelen = 16;
171		addr->bitlen = -1;
172		return 0;
173	}
174
175	if (family == AF_DECnet) {
176		struct dn_naddr dna;
177		addr->family = AF_DECnet;
178		if (dnet_pton(AF_DECnet, name, &dna) <= 0)
179			return -1;
180		memcpy(addr->data, dna.a_addr, 2);
181		addr->bytelen = 2;
182		addr->bitlen = -1;
183		return 0;
184	}
185
186	addr->family = AF_INET;
187	if (family != AF_UNSPEC && family != AF_INET)
188		return -1;
189	addr->bytelen = 4;
190	addr->bitlen = -1;
191	for (cp=name, i=0; *cp; cp++) {
192		if (*cp <= '9' && *cp >= '0') {
193			ap[i] = 10*ap[i] + (*cp-'0');
194			continue;
195		}
196		if (*cp == '.' && ++i <= 3)
197			continue;
198		return -1;
199	}
200	return 0;
201}
202
203int get_prefix_1(inet_prefix *dst, char *arg, int family)
204{
205	int err;
206	unsigned plen;
207	char *slash;
208
209	memset(dst, 0, sizeof(*dst));
210
211	if (strcmp(arg, "default") == 0 ||
212	    strcmp(arg, "any") == 0 ||
213	    strcmp(arg, "all") == 0) {
214		if (family == AF_DECnet)
215			return -1;
216		dst->family = family;
217		dst->bytelen = 0;
218		dst->bitlen = 0;
219		return 0;
220	}
221
222	slash = strchr(arg, '/');
223	if (slash)
224		*slash = 0;
225
226	err = get_addr_1(dst, arg, family);
227	if (err == 0) {
228		switch(dst->family) {
229			case AF_INET6:
230				dst->bitlen = 128;
231				break;
232			case AF_DECnet:
233				dst->bitlen = 16;
234				break;
235			default:
236			case AF_INET:
237				dst->bitlen = 32;
238		}
239		if (slash) {
240			if (get_integer(&plen, slash+1, 0) || plen > dst->bitlen) {
241				err = -1;
242				goto done;
243			}
244			dst->flags |= PREFIXLEN_SPECIFIED;
245			dst->bitlen = plen;
246		}
247	}
248done:
249	if (slash)
250		*slash = '/';
251	return err;
252}
253
254int get_addr(inet_prefix *dst, const char *arg, int family)
255{
256	if (family == AF_PACKET) {
257		fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
258		exit(1);
259	}
260	if (get_addr_1(dst, arg, family)) {
261		fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
262		exit(1);
263	}
264	return 0;
265}
266
267int get_prefix(inet_prefix *dst, char *arg, int family)
268{
269	if (family == AF_PACKET) {
270		fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
271		exit(1);
272	}
273	if (get_prefix_1(dst, arg, family)) {
274		fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
275		exit(1);
276	}
277	return 0;
278}
279
280__u32 get_addr32(const char *name)
281{
282	inet_prefix addr;
283	if (get_addr_1(&addr, name, AF_INET)) {
284		fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
285		exit(1);
286	}
287	return addr.data[0];
288}
289
290void incomplete_command(void)
291{
292	fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
293	exit(-1);
294}
295
296void missarg(const char *key)
297{
298	fprintf(stderr, "Error: argument \"%s\" is required\n", key);
299	exit(-1);
300}
301
302void invarg(const char *msg, const char *arg)
303{
304	fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
305	exit(-1);
306}
307
308void duparg(const char *key, const char *arg)
309{
310	fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
311	exit(-1);
312}
313
314void duparg2(const char *key, const char *arg)
315{
316	fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
317	exit(-1);
318}
319
320int matches(const char *cmd, const char *pattern)
321{
322	int len = strlen(cmd);
323	if (len > strlen(pattern))
324		return -1;
325	return memcmp(pattern, cmd, len);
326}
327
328int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
329{
330	__u32 *a1 = a->data;
331	__u32 *a2 = b->data;
332	int words = bits >> 0x05;
333
334	bits &= 0x1f;
335
336	if (words)
337		if (memcmp(a1, a2, words << 2))
338			return -1;
339
340	if (bits) {
341		__u32 w1, w2;
342		__u32 mask;
343
344		w1 = a1[words];
345		w2 = a2[words];
346
347		mask = htonl((0xffffffff) << (0x20 - bits));
348
349		if ((w1 ^ w2) & mask)
350			return 1;
351	}
352
353	return 0;
354}
355
356int __iproute2_hz_internal;
357
358int __get_hz(void)
359{
360	char name[1024];
361	int hz = 0;
362	FILE *fp;
363
364	if (getenv("HZ"))
365		return atoi(getenv("HZ")) ? : HZ;
366
367	if (getenv("PROC_NET_PSCHED")) {
368		snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
369	} else if (getenv("PROC_ROOT")) {
370		snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
371	} else {
372		strcpy(name, "/proc/net/psched");
373	}
374	fp = fopen(name, "r");
375
376	if (fp) {
377		unsigned nom, denom;
378		if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
379			if (nom == 1000000)
380				hz = denom;
381		fclose(fp);
382	}
383	if (hz)
384		return hz;
385	return HZ;
386}
387
388int __iproute2_user_hz_internal;
389
390int __get_user_hz(void)
391{
392	return sysconf(_SC_CLK_TCK);
393}
394
395const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
396{
397	switch (af) {
398	case AF_INET:
399	case AF_INET6:
400		return inet_ntop(af, addr, buf, buflen);
401	case AF_IPX:
402		return ipx_ntop(af, addr, buf, buflen);
403	case AF_DECnet:
404	{
405		struct dn_naddr dna = { 2, { 0, 0, }};
406		memcpy(dna.a_addr, addr, 2);
407		return dnet_ntop(af, &dna, buf, buflen);
408	}
409	default:
410		return "???";
411	}
412}
413
414#ifdef RESOLVE_HOSTNAMES
415struct namerec
416{
417	struct namerec *next;
418	inet_prefix addr;
419	char	    *name;
420};
421
422static struct namerec *nht[256];
423
424char *resolve_address(const char *addr, int len, int af)
425{
426	struct namerec *n;
427	struct hostent *h_ent;
428	unsigned hash;
429	static int notfirst;
430
431
432	if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
433	    ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
434		af = AF_INET;
435		addr += 12;
436		len = 4;
437	}
438
439	hash = addr[len-1] ^ addr[len-2] ^ addr[len-3] ^ addr[len-4];
440
441	for (n = nht[hash]; n; n = n->next) {
442		if (n->addr.family == af &&
443		    n->addr.bytelen == len &&
444		    memcmp(n->addr.data, addr, len) == 0)
445			return n->name;
446	}
447	if ((n = malloc(sizeof(*n))) == NULL)
448		return NULL;
449	n->addr.family = af;
450	n->addr.bytelen = len;
451	n->name = NULL;
452	memcpy(n->addr.data, addr, len);
453	n->next = nht[hash];
454	nht[hash] = n;
455	if (++notfirst == 1)
456		sethostent(1);
457	fflush(stdout);
458
459	if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
460		n->name = strdup(h_ent->h_name);
461
462	/* Even if we fail, "negative" entry is remembered. */
463	return n->name;
464}
465#endif
466
467
468const char *format_host(int af, int len, const void *addr,
469			char *buf, int buflen)
470{
471#ifdef RESOLVE_HOSTNAMES
472	if (resolve_hosts) {
473		char *n;
474		if (len <= 0) {
475			switch (af) {
476			case AF_INET:
477				len = 4;
478				break;
479			case AF_INET6:
480				len = 16;
481				break;
482			case AF_IPX:
483				len = 10;
484				break;
485#ifdef AF_DECnet
486			/* I see no reasons why gethostbyname
487			   may not work for DECnet */
488			case AF_DECnet:
489				len = 2;
490				break;
491#endif
492			default: ;
493			}
494		}
495		if (len > 0 &&
496		    (n = resolve_address(addr, len, af)) != NULL)
497			return n;
498	}
499#endif
500	return rt_addr_n2a(af, len, addr, buf, buflen);
501}
502
503
504__u8* hexstring_n2a(const __u8 *str, int len, __u8 *buf, int blen)
505{
506	__u8 *ptr = buf;
507	int i;
508
509	for (i=0; i<len; i++) {
510		if (blen < 3)
511			break;
512		sprintf(ptr, "%02x", str[i]);
513		ptr += 2;
514		blen -= 2;
515		if (i != len-1 && blen > 1) {
516			*ptr++ = ':';
517			blen--;
518		}
519	}
520	return buf;
521}
522
523__u8* hexstring_a2n(const __u8 *str, __u8 *buf, int blen)
524{
525	int cnt = 0;
526
527	for (;;) {
528		unsigned acc;
529		char ch;
530
531		acc = 0;
532
533		while ((ch = *str) != ':' && ch != 0) {
534			if (ch >= '0' && ch <= '9')
535				ch -= '0';
536			else if (ch >= 'a' && ch <= 'f')
537				ch -= 'a'-10;
538			else if (ch >= 'A' && ch <= 'F')
539				ch -= 'A'-10;
540			else
541				return NULL;
542			acc = (acc<<4) + ch;
543			str++;
544		}
545
546		if (acc > 255)
547			return NULL;
548		if (cnt < blen) {
549			buf[cnt] = acc;
550			cnt++;
551		}
552		if (ch == 0)
553			break;
554		++str;
555	}
556	if (cnt < blen)
557		memset(buf+cnt, 0, blen-cnt);
558	return buf;
559}
560