utils.c revision 5e8bc6316b1a6c56598cdb29a737d1d670d74e69 
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->bitlen = plen;
245		}
246	}
247done:
248	if (slash)
249		*slash = '/';
250	return err;
251}
252
253int get_addr(inet_prefix *dst, const char *arg, int family)
254{
255	if (family == AF_PACKET) {
256		fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
257		exit(1);
258	}
259	if (get_addr_1(dst, arg, family)) {
260		fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
261		exit(1);
262	}
263	return 0;
264}
265
266int get_prefix(inet_prefix *dst, char *arg, int family)
267{
268	if (family == AF_PACKET) {
269		fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
270		exit(1);
271	}
272	if (get_prefix_1(dst, arg, family)) {
273		fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
274		exit(1);
275	}
276	return 0;
277}
278
279__u32 get_addr32(const char *name)
280{
281	inet_prefix addr;
282	if (get_addr_1(&addr, name, AF_INET)) {
283		fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
284		exit(1);
285	}
286	return addr.data[0];
287}
288
289void incomplete_command(void)
290{
291	fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
292	exit(-1);
293}
294
295void missarg(const char *key)
296{
297	fprintf(stderr, "Error: argument \"%s\" is required\n", key);
298	exit(-1);
299}
300
301void invarg(const char *msg, const char *arg)
302{
303	fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
304	exit(-1);
305}
306
307void duparg(const char *key, const char *arg)
308{
309	fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
310	exit(-1);
311}
312
313void duparg2(const char *key, const char *arg)
314{
315	fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
316	exit(-1);
317}
318
319int matches(const char *cmd, const char *pattern)
320{
321	int len = strlen(cmd);
322	if (len > strlen(pattern))
323		return -1;
324	return memcmp(pattern, cmd, len);
325}
326
327int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
328{
329	__u32 *a1 = a->data;
330	__u32 *a2 = b->data;
331	int words = bits >> 0x05;
332
333	bits &= 0x1f;
334
335	if (words)
336		if (memcmp(a1, a2, words << 2))
337			return -1;
338
339	if (bits) {
340		__u32 w1, w2;
341		__u32 mask;
342
343		w1 = a1[words];
344		w2 = a2[words];
345
346		mask = htonl((0xffffffff) << (0x20 - bits));
347
348		if ((w1 ^ w2) & mask)
349			return 1;
350	}
351
352	return 0;
353}
354
355int __iproute2_hz_internal;
356
357int __get_hz(void)
358{
359	char name[1024];
360	int hz = 0;
361	FILE *fp;
362
363	if (getenv("HZ"))
364		return atoi(getenv("HZ")) ? : HZ;
365
366	if (getenv("PROC_NET_PSCHED")) {
367		snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
368	} else if (getenv("PROC_ROOT")) {
369		snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
370	} else {
371		strcpy(name, "/proc/net/psched");
372	}
373	fp = fopen(name, "r");
374
375	if (fp) {
376		unsigned nom, denom;
377		if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
378			if (nom == 1000000)
379				hz = denom;
380		fclose(fp);
381	}
382	if (hz)
383		return hz;
384	return HZ;
385}
386
387int __iproute2_user_hz_internal;
388
389int __get_user_hz(void)
390{
391	return sysconf(_SC_CLK_TCK);
392}
393
394const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
395{
396	switch (af) {
397	case AF_INET:
398	case AF_INET6:
399		return inet_ntop(af, addr, buf, buflen);
400	case AF_IPX:
401		return ipx_ntop(af, addr, buf, buflen);
402	case AF_DECnet:
403	{
404		struct dn_naddr dna = { 2, { 0, 0, }};
405		memcpy(dna.a_addr, addr, 2);
406		return dnet_ntop(af, &dna, buf, buflen);
407	}
408	default:
409		return "???";
410	}
411}
412
413#ifdef RESOLVE_HOSTNAMES
414struct namerec
415{
416	struct namerec *next;
417	inet_prefix addr;
418	char	    *name;
419};
420
421static struct namerec *nht[256];
422
423char *resolve_address(const char *addr, int len, int af)
424{
425	struct namerec *n;
426	struct hostent *h_ent;
427	unsigned hash;
428	static int notfirst;
429
430
431	if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
432	    ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
433		af = AF_INET;
434		addr += 12;
435		len = 4;
436	}
437
438	hash = addr[len-1] ^ addr[len-2] ^ addr[len-3] ^ addr[len-4];
439
440	for (n = nht[hash]; n; n = n->next) {
441		if (n->addr.family == af &&
442		    n->addr.bytelen == len &&
443		    memcmp(n->addr.data, addr, len) == 0)
444			return n->name;
445	}
446	if ((n = malloc(sizeof(*n))) == NULL)
447		return NULL;
448	n->addr.family = af;
449	n->addr.bytelen = len;
450	n->name = NULL;
451	memcpy(n->addr.data, addr, len);
452	n->next = nht[hash];
453	nht[hash] = n;
454	if (++notfirst == 1)
455		sethostent(1);
456	fflush(stdout);
457
458	if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
459		n->name = strdup(h_ent->h_name);
460
461	/* Even if we fail, "negative" entry is remembered. */
462	return n->name;
463}
464#endif
465
466
467const char *format_host(int af, int len, const void *addr,
468			char *buf, int buflen)
469{
470#ifdef RESOLVE_HOSTNAMES
471	if (resolve_hosts) {
472		char *n;
473		if (len <= 0) {
474			switch (af) {
475			case AF_INET:
476				len = 4;
477				break;
478			case AF_INET6:
479				len = 16;
480				break;
481			case AF_IPX:
482				len = 10;
483				break;
484#ifdef AF_DECnet
485			/* I see no reasons why gethostbyname
486			   may not work for DECnet */
487			case AF_DECnet:
488				len = 2;
489				break;
490#endif
491			default: ;
492			}
493		}
494		if (len > 0 &&
495		    (n = resolve_address(addr, len, af)) != NULL)
496			return n;
497	}
498#endif
499	return rt_addr_n2a(af, len, addr, buf, buflen);
500}
501
502
503__u8* hexstring_n2a(const __u8 *str, int len, __u8 *buf, int blen)
504{
505	__u8 *ptr = buf;
506	int i;
507
508	for (i=0; i<len; i++) {
509		if (blen < 3)
510			break;
511		sprintf(ptr, "%02x", str[i]);
512		ptr += 2;
513		blen -= 2;
514		if (i != len-1 && blen > 1) {
515			*ptr++ = ':';
516			blen--;
517		}
518	}
519	return buf;
520}
521
522__u8* hexstring_a2n(const __u8 *str, __u8 *buf, int blen)
523{
524	int cnt = 0;
525
526	for (;;) {
527		unsigned acc;
528		char ch;
529
530		acc = 0;
531
532		while ((ch = *str) != ':' && ch != 0) {
533			if (ch >= '0' && ch <= '9')
534				ch -= '0';
535			else if (ch >= 'a' && ch <= 'f')
536				ch -= 'a'-10;
537			else if (ch >= 'A' && ch <= 'F')
538				ch -= 'A'-10;
539			else
540				return NULL;
541			acc = (acc<<4) + ch;
542			str++;
543		}
544
545		if (acc > 255)
546			return NULL;
547		if (cnt < blen) {
548			buf[cnt] = acc;
549			cnt++;
550		}
551		if (ch == 0)
552			break;
553		++str;
554	}
555	if (cnt < blen)
556		memset(buf+cnt, 0, blen-cnt);
557	return buf;
558}
559