utils.c revision c7699875bee00fbcd057fc62c30d6560b044e007 
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, const 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	err = get_addr_1(dst, arg, family);
226	if (err == 0) {
227		switch(dst->family) {
228			case AF_INET6:
229				dst->bitlen = 128;
230				break;
231			case AF_DECnet:
232				dst->bitlen = 16;
233				break;
234			default:
235			case AF_INET:
236				dst->bitlen = 32;
237		}
238		if (slash) {
239			if (get_integer(&plen, slash+1, 0) || plen > dst->bitlen) {
240				err = -1;
241				goto done;
242			}
243			dst->bitlen = plen;
244		}
245	}
246done:
247	if (slash)
248		*slash = '/';
249	return err;
250}
251
252int get_addr(inet_prefix *dst, const char *arg, int family)
253{
254	if (family == AF_PACKET) {
255		fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
256		exit(1);
257	}
258	if (get_addr_1(dst, arg, family)) {
259		fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
260		exit(1);
261	}
262	return 0;
263}
264
265int get_prefix(inet_prefix *dst, const char *arg, int family)
266{
267	if (family == AF_PACKET) {
268		fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
269		exit(1);
270	}
271	if (get_prefix_1(dst, arg, family)) {
272		fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
273		exit(1);
274	}
275	return 0;
276}
277
278__u32 get_addr32(const char *name)
279{
280	inet_prefix addr;
281	if (get_addr_1(&addr, name, AF_INET)) {
282		fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
283		exit(1);
284	}
285	return addr.data[0];
286}
287
288void incomplete_command(void)
289{
290	fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
291	exit(-1);
292}
293
294void missarg(const char *key)
295{
296	fprintf(stderr, "Error: argument \"%s\" is required\n", key);
297	exit(-1);
298}
299
300void invarg(const char *msg, const char *arg)
301{
302	fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
303	exit(-1);
304}
305
306void duparg(const char *key, const char *arg)
307{
308	fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
309	exit(-1);
310}
311
312void duparg2(const char *key, const char *arg)
313{
314	fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
315	exit(-1);
316}
317
318int matches(const char *cmd, const char *pattern)
319{
320	int len = strlen(cmd);
321	if (len > strlen(pattern))
322		return -1;
323	return memcmp(pattern, cmd, len);
324}
325
326int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
327{
328	__u32 *a1 = a->data;
329	__u32 *a2 = b->data;
330	int words = bits >> 0x05;
331
332	bits &= 0x1f;
333
334	if (words)
335		if (memcmp(a1, a2, words << 2))
336			return -1;
337
338	if (bits) {
339		__u32 w1, w2;
340		__u32 mask;
341
342		w1 = a1[words];
343		w2 = a2[words];
344
345		mask = htonl((0xffffffff) << (0x20 - bits));
346
347		if ((w1 ^ w2) & mask)
348			return 1;
349	}
350
351	return 0;
352}
353
354int __iproute2_hz_internal;
355
356int __get_hz(void)
357{
358	char name[1024];
359	int hz = 0;
360	FILE *fp;
361
362	if (getenv("HZ"))
363		return atoi(getenv("HZ")) ? : HZ;
364
365	if (getenv("PROC_NET_PSCHED")) {
366		snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
367	} else if (getenv("PROC_ROOT")) {
368		snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
369	} else {
370		strcpy(name, "/proc/net/psched");
371	}
372	fp = fopen(name, "r");
373
374	if (fp) {
375		unsigned nom, denom;
376		if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
377			if (nom == 1000000)
378				hz = denom;
379		fclose(fp);
380	}
381	if (hz)
382		return hz;
383	return HZ;
384}
385
386const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
387{
388	switch (af) {
389	case AF_INET:
390	case AF_INET6:
391		return inet_ntop(af, addr, buf, buflen);
392	case AF_IPX:
393		return ipx_ntop(af, addr, buf, buflen);
394	case AF_DECnet:
395	{
396		struct dn_naddr dna = { 2, { 0, 0, }};
397		memcpy(dna.a_addr, addr, 2);
398		return dnet_ntop(af, &dna, buf, buflen);
399	}
400	default:
401		return "???";
402	}
403}
404
405#ifdef RESOLVE_HOSTNAMES
406struct namerec
407{
408	struct namerec *next;
409	inet_prefix addr;
410	char	    *name;
411};
412
413static struct namerec *nht[256];
414
415char *resolve_address(const char *addr, int len, int af)
416{
417	struct namerec *n;
418	struct hostent *h_ent;
419	unsigned hash;
420	static int notfirst;
421
422
423	if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
424	    ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
425		af = AF_INET;
426		addr += 12;
427		len = 4;
428	}
429
430	hash = addr[len-1] ^ addr[len-2] ^ addr[len-3] ^ addr[len-4];
431
432	for (n = nht[hash]; n; n = n->next) {
433		if (n->addr.family == af &&
434		    n->addr.bytelen == len &&
435		    memcmp(n->addr.data, addr, len) == 0)
436			return n->name;
437	}
438	if ((n = malloc(sizeof(*n))) == NULL)
439		return NULL;
440	n->addr.family = af;
441	n->addr.bytelen = len;
442	n->name = NULL;
443	memcpy(n->addr.data, addr, len);
444	n->next = nht[hash];
445	nht[hash] = n;
446	if (++notfirst == 1)
447		sethostent(1);
448	fflush(stdout);
449
450	if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
451		n->name = strdup(h_ent->h_name);
452
453	/* Even if we fail, "negative" entry is remembered. */
454	return n->name;
455}
456#endif
457
458
459const char *format_host(int af, int len, const void *addr,
460			char *buf, int buflen)
461{
462#ifdef RESOLVE_HOSTNAMES
463	if (resolve_hosts) {
464		char *n;
465		if (len <= 0) {
466			switch (af) {
467			case AF_INET:
468				len = 4;
469				break;
470			case AF_INET6:
471				len = 16;
472				break;
473			case AF_IPX:
474				len = 10;
475				break;
476#ifdef AF_DECnet
477			/* I see no reasons why gethostbyname
478			   may not work for DECnet */
479			case AF_DECnet:
480				len = 2;
481				break;
482#endif
483			default: ;
484			}
485		}
486		if (len > 0 &&
487		    (n = resolve_address(addr, len, af)) != NULL)
488			return n;
489	}
490#endif
491	return rt_addr_n2a(af, len, addr, buf, buflen);
492}
493
494
495__u8* hexstring_n2a(const __u8 *str, int len, __u8 *buf, int blen)
496{
497	__u8 *ptr = buf;
498	int i;
499
500	for (i=0; i<len; i++) {
501		if (blen < 3)
502			break;
503		sprintf(ptr, "%02x", str[i]);
504		ptr += 2;
505		blen -= 2;
506		if (i != len-1 && blen > 1) {
507			*ptr++ = ':';
508			blen--;
509		}
510	}
511	return buf;
512}
513
514__u8* hexstring_a2n(const __u8 *str, __u8 *buf, int blen)
515{
516	int cnt = 0;
517
518	for (;;) {
519		unsigned acc;
520		char ch;
521
522		acc = 0;
523
524		while ((ch = *str) != ':' && ch != 0) {
525			if (ch >= '0' && ch <= '9')
526				ch -= '0';
527			else if (ch >= 'a' && ch <= 'f')
528				ch -= 'a'-10;
529			else if (ch >= 'A' && ch <= 'F')
530				ch -= 'A'-10;
531			else
532				return NULL;
533			acc = (acc<<4) + ch;
534			str++;
535		}
536
537		if (acc > 255)
538			return NULL;
539		if (cnt < blen) {
540			buf[cnt] = acc;
541			cnt++;
542		}
543		if (ch == 0)
544			break;
545		++str;
546	}
547	if (cnt < blen)
548		memset(buf+cnt, 0, blen-cnt);
549	return buf;
550}
551