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NetBSD/sbin/routed/rtquery/rtquery.c
wiz 14dbdf5518 Negative exit code cleanup: Replace exit(-x) with exit(x). 
As seen on tech-userlevel.
2001-04-06 11:13:45 +00:00

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/* $NetBSD: rtquery.c,v 1.15 2001/04/06 11:13:46 wiz Exp $ */
/*-
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#define RIPVERSION RIPv2
#include <protocols/routed.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef sgi
#include <strings.h>
#include <bstring.h>
#endif
#define UNUSED __attribute__((unused))
#ifndef __RCSID
#define __RCSID(_s) static const char rcsid[] UNUSED = _s
#endif
#ifndef __COPYRIGHT
#define __COPYRIGHT(_s) static const char copyright[] UNUSED = _s
#endif
__COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993\n"
"The Regents of the University of California."
" All rights reserved.\n");
#ifdef __NetBSD__
__RCSID("$NetBSD: rtquery.c,v 1.15 2001/04/06 11:13:46 wiz Exp $");
#elif defined(__FreeBSD__)
__RCSID("$FreeBSD$");
#else
__RCSID("Revision: 2.23 ");
#ident "Revision: 2.23 "
#endif
#include <md5.h>
#ifndef sgi
#define _HAVE_SIN_LEN
#endif
#define WTIME 15 /* Time to wait for all responses */
#define STIME (250*1000) /* usec to wait for another response */
int soc;
const char *pgmname;
union {
struct rip rip;
char packet[MAXPACKETSIZE+MAXPATHLEN];
} omsg_buf;
#define OMSG omsg_buf.rip
int omsg_len = sizeof(struct rip);
union {
struct rip rip;
char packet[MAXPACKETSIZE+1024];
} imsg_buf;
#define IMSG imsg_buf.rip
int nflag; /* numbers, no names */
int pflag; /* play the `gated` game */
int ripv2 = 1; /* use RIP version 2 */
int wtime = WTIME;
int rflag; /* 1=ask about a particular route */
int trace, not_trace; /* send trace command or not */
int auth_type = RIP_AUTH_NONE;
char passwd[RIP_AUTH_PW_LEN];
u_long keyid;
struct timeval sent; /* when query sent */
static char localhost_str[] = "localhost";
static char *default_argv[] = {localhost_str, 0};
static void rip_input(struct sockaddr_in*, int);
static int out(const char *);
static void trace_loop(char *argv[]) __attribute((__noreturn__));
static void query_loop(char *argv[], int) __attribute((__noreturn__));
static int getnet(char *, struct netinfo *);
static u_int std_mask(u_int);
static int parse_quote(char **, const char *, char *, char *, int);
static void usage(void);
int
main(int argc,
char *argv[])
{
int ch, bsize;
char *p, *options, *value, delim;
const char *result;
OMSG.rip_nets[0].n_dst = RIP_DEFAULT;
OMSG.rip_nets[0].n_family = RIP_AF_UNSPEC;
OMSG.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
pgmname = argv[0];
while ((ch = getopt(argc, argv, "np1w:r:t:a:")) != -1)
switch (ch) {
case 'n':
not_trace = 1;
nflag = 1;
break;
case 'p':
not_trace = 1;
pflag = 1;
break;
case '1':
ripv2 = 0;
break;
case 'w':
not_trace = 1;
wtime = (int)strtoul(optarg, &p, 0);
if (*p != '\0'
|| wtime <= 0)
usage();
break;
case 'r':
not_trace = 1;
if (rflag)
usage();
rflag = getnet(optarg, &OMSG.rip_nets[0]);
if (!rflag) {
struct hostent *hp = gethostbyname(optarg);
if (hp == 0) {
fprintf(stderr, "%s: %s:",
pgmname, optarg);
herror(0);
exit(1);
}
memcpy(&OMSG.rip_nets[0].n_dst, hp->h_addr,
sizeof(OMSG.rip_nets[0].n_dst));
OMSG.rip_nets[0].n_family = RIP_AF_INET;
OMSG.rip_nets[0].n_mask = -1;
rflag = 1;
}
break;
case 't':
trace = 1;
options = optarg;
while (*options != '\0') {
/* messy complications to make -W -Wall happy */
static char on_str[] = "on";
static char more_str[] = "more";
static char off_str[] = "off";
static char dump_str[] = "dump";
static char *traceopts[] = {
# define TRACE_ON 0
on_str,
# define TRACE_MORE 1
more_str,
# define TRACE_OFF 2
off_str,
# define TRACE_DUMP 3
dump_str,
0
};
result = "";
switch (getsubopt(&options,traceopts,&value)) {
case TRACE_ON:
OMSG.rip_cmd = RIPCMD_TRACEON;
if (!value
|| strlen(value) > MAXPATHLEN)
usage();
result = value;
break;
case TRACE_MORE:
if (value)
usage();
OMSG.rip_cmd = RIPCMD_TRACEON;
break;
case TRACE_OFF:
if (value)
usage();
OMSG.rip_cmd = RIPCMD_TRACEOFF;
break;
case TRACE_DUMP:
if (value)
usage();
OMSG.rip_cmd = RIPCMD_TRACEON;
result = "dump/../table";
break;
default:
usage();
}
strcpy((char*)OMSG.rip_tracefile, result);
omsg_len += strlen(result) - sizeof(OMSG.ripun);
}
break;
case 'a':
not_trace = 1;
p = strchr(optarg,'=');
if (!p)
usage();
*p++ = '\0';
if (!strcasecmp("passwd",optarg))
auth_type = RIP_AUTH_PW;
else if (!strcasecmp("md5_passwd",optarg))
auth_type = RIP_AUTH_MD5;
else
usage();
if (0 > parse_quote(&p,"|",&delim,
passwd, sizeof(passwd)))
usage();
if (auth_type == RIP_AUTH_MD5
&& delim == '|') {
keyid = strtoul(p+1,&p,0);
if (keyid > 255 || *p != '\0')
usage();
} else if (delim != '\0') {
usage();
}
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (not_trace && trace)
usage();
if (argc == 0) {
argc = 1;
argv = default_argv;
}
soc = socket(AF_INET, SOCK_DGRAM, 0);
if (soc < 0) {
perror("socket");
exit(2);
}
/* be prepared to receive a lot of routes */
for (bsize = 127*1024; ; bsize -= 1024) {
if (setsockopt(soc, SOL_SOCKET, SO_RCVBUF,
&bsize, sizeof(bsize)) == 0)
break;
if (bsize <= 4*1024) {
perror("setsockopt SO_RCVBUF");
break;
}
}
if (trace)
trace_loop(argv);
else
query_loop(argv, argc);
/* NOTREACHED */
return 0;
}
static void
usage(void)
{
fprintf(stderr,
"usage: rtquery [-np1] [-r tgt_rt] [-w wtime]"
" [-a type=passwd] host1 [host2 ...]\n"
"\trtquery -t {on=filename|more|off|dump}"
" host1 [host2 ...]\n");
exit(1);
}
/* tell the target hosts about tracing
*/
static void
trace_loop(char *argv[])
{
struct sockaddr_in myaddr;
int res;
if (geteuid() != 0) {
(void)fprintf(stderr, "-t requires UID 0\n");
exit(1);
}
if (ripv2) {
OMSG.rip_vers = RIPv2;
} else {
OMSG.rip_vers = RIPv1;
}
memset(&myaddr, 0, sizeof(myaddr));
myaddr.sin_family = AF_INET;
#ifdef _HAVE_SIN_LEN
myaddr.sin_len = sizeof(myaddr);
#endif
myaddr.sin_port = htons(IPPORT_RESERVED-1);
while (bind(soc, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
if (errno != EADDRINUSE
|| myaddr.sin_port == 0) {
perror("bind");
exit(2);
}
myaddr.sin_port = htons(ntohs(myaddr.sin_port)-1);
}
res = 1;
while (*argv != 0) {
if (out(*argv++) <= 0)
res = 0;
}
exit(res);
}
/* query all of the listed hosts
*/
static void
query_loop(char *argv[], int argc)
{
# define NA0 (OMSG.rip_auths[0])
# define NA2 (OMSG.rip_auths[2])
struct seen {
struct seen *next;
struct in_addr addr;
} *seen, *sp;
int answered = 0;
int cc;
fd_set bits;
struct timeval now, delay;
struct sockaddr_in from;
int fromlen;
MD5_CTX md5_ctx;
OMSG.rip_cmd = (pflag) ? RIPCMD_POLL : RIPCMD_REQUEST;
if (ripv2) {
OMSG.rip_vers = RIPv2;
if (auth_type == RIP_AUTH_PW) {
OMSG.rip_nets[1] = OMSG.rip_nets[0];
NA0.a_family = RIP_AF_AUTH;
NA0.a_type = RIP_AUTH_PW;
memcpy(NA0.au.au_pw, passwd, RIP_AUTH_PW_LEN);
omsg_len += sizeof(OMSG.rip_nets[0]);
} else if (auth_type == RIP_AUTH_MD5) {
OMSG.rip_nets[1] = OMSG.rip_nets[0];
NA0.a_family = RIP_AF_AUTH;
NA0.a_type = RIP_AUTH_MD5;
NA0.au.a_md5.md5_keyid = (int8_t)keyid;
NA0.au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN;
NA0.au.a_md5.md5_seqno = 0;
cc = (char *)&NA2-(char *)&OMSG;
NA0.au.a_md5.md5_pkt_len = htons(cc);
NA2.a_family = RIP_AF_AUTH;
NA2.a_type = htons(1);
MD5Init(&md5_ctx);
MD5Update(&md5_ctx,
(u_char *)&OMSG, cc);
MD5Update(&md5_ctx,
(u_char *)passwd, RIP_AUTH_MD5_LEN);
MD5Final(NA2.au.au_pw, &md5_ctx);
omsg_len += 2*sizeof(OMSG.rip_nets[0]);
}
} else {
OMSG.rip_vers = RIPv1;
OMSG.rip_nets[0].n_mask = 0;
}
/* ask the first (valid) host */
seen = 0;
while (0 > out(*argv++)) {
if (*argv == 0)
exit(1);
answered++;
}
FD_ZERO(&bits);
for (;;) {
FD_SET(soc, &bits);
delay.tv_sec = 0;
delay.tv_usec = STIME;
cc = select(soc+1, &bits, 0,0, &delay);
if (cc > 0) {
fromlen = sizeof(from);
cc = recvfrom(soc, imsg_buf.packet,
sizeof(imsg_buf.packet), 0,
(struct sockaddr *)&from, &fromlen);
if (cc < 0) {
perror("recvfrom");
exit(1);
}
/* count the distinct responding hosts.
* You cannot match responding hosts with
* addresses to which queries were transmitted,
* because a router might respond with a
* different source address.
*/
for (sp = seen; sp != 0; sp = sp->next) {
if (sp->addr.s_addr == from.sin_addr.s_addr)
break;
}
if (sp == 0) {
sp = malloc(sizeof(*sp));
if (sp == 0) {
fprintf(stderr,
"rtquery: malloc failed\n");
exit(1);
}
sp->addr = from.sin_addr;
sp->next = seen;
seen = sp;
answered++;
}
rip_input(&from, cc);
continue;
}
if (cc < 0) {
if (errno == EINTR)
continue;
perror("select");
exit(1);
}
/* After a pause in responses, probe another host.
* This reduces the intermingling of answers.
*/
while (*argv != 0 && 0 > out(*argv++))
answered++;
/* continue until no more packets arrive
* or we have heard from all hosts
*/
if (answered >= argc)
break;
/* or until we have waited a long time
*/
if (gettimeofday(&now, 0) < 0) {
perror("gettimeofday(now)");
exit(1);
}
if (sent.tv_sec + wtime <= now.tv_sec)
break;
}
/* fail if there was no answer */
exit (answered >= argc ? 0 : 1);
}
/* send to one host
*/
static int
out(const char *host)
{
struct sockaddr_in router;
struct hostent *hp;
if (gettimeofday(&sent, 0) < 0) {
perror("gettimeofday(sent)");
return -1;
}
memset(&router, 0, sizeof(router));
router.sin_family = AF_INET;
#ifdef _HAVE_SIN_LEN
router.sin_len = sizeof(router);
#endif
if (!inet_aton(host, &router.sin_addr)) {
hp = gethostbyname(host);
if (hp == 0) {
herror(host);
return -1;
}
memcpy(&router.sin_addr, hp->h_addr, sizeof(router.sin_addr));
}
router.sin_port = htons(RIP_PORT);
if (sendto(soc, &omsg_buf, omsg_len, 0,
(struct sockaddr *)&router, sizeof(router)) < 0) {
perror(host);
return -1;
}
return 0;
}
/*
* Convert string to printable characters
*/
static char *
qstring(u_char *s, int len)
{
static char buf[8*20+1];
char *p;
u_char *s2, c;
for (p = buf; len != 0 && p < &buf[sizeof(buf)-1]; len--) {
c = *s++;
if (c == '\0') {
for (s2 = s+1; s2 < &s[len]; s2++) {
if (*s2 != '\0')
break;
}
if (s2 >= &s[len])
goto exit;
}
if (c >= ' ' && c < 0x7f && c != '\\') {
*p++ = c;
continue;
}
*p++ = '\\';
switch (c) {
case '\\':
*p++ = '\\';
break;
case '\n':
*p++= 'n';
break;
case '\r':
*p++= 'r';
break;
case '\t':
*p++ = 't';
break;
case '\b':
*p++ = 'b';
break;
default:
p += sprintf(p,"%o",c);
break;
}
}
exit:
*p = '\0';
return buf;
}
/*
* Handle an incoming RIP packet.
*/
static void
rip_input(struct sockaddr_in *from,
int size)
{
struct netinfo *n, *lim;
struct in_addr in;
const char *name;
char net_buf[80];
u_char hash[RIP_AUTH_MD5_LEN];
MD5_CTX md5_ctx;
u_char md5_authed = 0;
u_int mask, dmask;
char *sp;
int i;
struct hostent *hp;
struct netent *np;
struct netauth *na;
if (nflag) {
printf("%s:", inet_ntoa(from->sin_addr));
} else {
hp = gethostbyaddr((char*)&from->sin_addr,
sizeof(struct in_addr), AF_INET);
if (hp == 0) {
printf("%s:",
inet_ntoa(from->sin_addr));
} else {
printf("%s (%s):", hp->h_name,
inet_ntoa(from->sin_addr));
}
}
if (IMSG.rip_cmd != RIPCMD_RESPONSE) {
printf("\n unexpected response type %d\n", IMSG.rip_cmd);
return;
}
printf(" RIPv%d%s %d bytes\n", IMSG.rip_vers,
(IMSG.rip_vers != RIPv1 && IMSG.rip_vers != RIPv2) ? " ?" : "",
size);
if (size > MAXPACKETSIZE) {
if (size > (int)sizeof(imsg_buf) - (int)sizeof(*n)) {
printf(" at least %d bytes too long\n",
size-MAXPACKETSIZE);
size = (int)sizeof(imsg_buf) - (int)sizeof(*n);
} else {
printf(" %d bytes too long\n",
size-MAXPACKETSIZE);
}
} else if (size%sizeof(*n) != sizeof(struct rip)%sizeof(*n)) {
printf(" response of bad length=%d\n", size);
}
n = IMSG.rip_nets;
lim = (struct netinfo *)((char*)n + size) - 1;
for (; n <= lim; n++) {
name = "";
if (n->n_family == RIP_AF_INET) {
in.s_addr = n->n_dst;
(void)strcpy(net_buf, inet_ntoa(in));
mask = ntohl(n->n_mask);
dmask = mask & -mask;
if (mask != 0) {
sp = &net_buf[strlen(net_buf)];
if (IMSG.rip_vers == RIPv1) {
(void)sprintf(sp," mask=%#x ? ",mask);
mask = 0;
} else if (mask + dmask == 0) {
for (i = 0;
(i != 32
&& ((1<<i)&mask) == 0);
i++)
continue;
(void)sprintf(sp, "/%d",32-i);
} else {
(void)sprintf(sp," (mask %#x)", mask);
}
}
if (!nflag) {
if (mask == 0) {
mask = std_mask(in.s_addr);
if ((ntohl(in.s_addr) & ~mask) != 0)
mask = 0;
}
/* Without a netmask, do not worry about
* whether the destination is a host or a
* network. Try both and use the first name
* we get.
*
* If we have a netmask we can make a
* good guess.
*/
if ((in.s_addr & ~mask) == 0) {
np = getnetbyaddr((long)in.s_addr,
AF_INET);
if (np != 0)
name = np->n_name;
else if (in.s_addr == 0)
name = "default";
}
if (name[0] == '\0'
&& ((in.s_addr & ~mask) != 0
|| mask == 0xffffffff)) {
hp = gethostbyaddr((char*)&in,
sizeof(in),
AF_INET);
if (hp != 0)
name = hp->h_name;
}
}
} else if (n->n_family == RIP_AF_AUTH) {
na = (struct netauth*)n;
if (na->a_type == RIP_AUTH_PW
&& n == IMSG.rip_nets) {
(void)printf(" Password Authentication:"
" \"%s\"\n",
qstring(na->au.au_pw,
RIP_AUTH_PW_LEN));
continue;
}
if (na->a_type == RIP_AUTH_MD5
&& n == IMSG.rip_nets) {
(void)printf(" MD5 Auth"
" len=%d KeyID=%d"
" auth_len=%d"
" seqno=%#x"
" rsvd=%#x,%#x\n",
ntohs(na->au.a_md5.md5_pkt_len),
na->au.a_md5.md5_keyid,
na->au.a_md5.md5_auth_len,
(int)ntohl(na->au.a_md5.md5_seqno),
na->au.a_md5.rsvd[0],
na->au.a_md5.rsvd[1]);
md5_authed = 1;
continue;
}
(void)printf(" Authentication type %d: ",
ntohs(na->a_type));
for (i = 0; i < (int)sizeof(na->au.au_pw); i++)
(void)printf("%02x ", na->au.au_pw[i]);
putc('\n', stdout);
if (md5_authed && n+1 > lim
&& na->a_type == ntohs(1)) {
MD5Init(&md5_ctx);
MD5Update(&md5_ctx, (u_char *)&IMSG,
(char *)na-(char *)&IMSG);
MD5Update(&md5_ctx, (u_char *)passwd,
RIP_AUTH_MD5_LEN);
MD5Final(hash, &md5_ctx);
(void)printf(" %s hash\n",
memcmp(hash, na->au.au_pw,
sizeof(hash))
? "WRONG" : "correct");
}
continue;
} else {
(void)sprintf(net_buf, "(af %#x) %d.%d.%d.%d",
ntohs(n->n_family),
(unsigned char)(n->n_dst >> 24),
(unsigned char)(n->n_dst >> 16),
(unsigned char)(n->n_dst >> 8),
(unsigned char)n->n_dst);
}
(void)printf(" %-18s metric %2d %-10s",
net_buf, (int)ntohl(n->n_metric), name);
if (n->n_nhop != 0) {
in.s_addr = n->n_nhop;
if (nflag)
hp = 0;
else
hp = gethostbyaddr((char*)&in, sizeof(in),
AF_INET);
(void)printf(" nhop=%-15s%s",
(hp != 0) ? hp->h_name : inet_ntoa(in),
(IMSG.rip_vers == RIPv1) ? " ?" : "");
}
if (n->n_tag != 0)
(void)printf(" tag=%#x%s", n->n_tag,
(IMSG.rip_vers == RIPv1) ? " ?" : "");
putc('\n', stdout);
}
}
/* Return the classical netmask for an IP address.
*/
static u_int
std_mask(u_int addr) /* in network order */
{
NTOHL(addr); /* was a host, not a network */
if (addr == 0) /* default route has mask 0 */
return 0;
if (IN_CLASSA(addr))
return IN_CLASSA_NET;
if (IN_CLASSB(addr))
return IN_CLASSB_NET;
return IN_CLASSC_NET;
}
/* get a network number as a name or a number, with an optional "/xx"
* netmask.
*/
static int /* 0=bad */
getnet(char *name,
struct netinfo *rt)
{
int i;
struct netent *nentp;
u_int mask;
struct in_addr in;
char hname[MAXHOSTNAMELEN+1];
char *mname, *p;
/* Detect and separate "1.2.3.4/24"
*/
if (0 != (mname = strrchr(name,'/'))) {
i = (int)(mname - name);
if (i > (int)sizeof(hname)-1) /* name too long */
return 0;
memmove(hname, name, i);
hname[i] = '\0';
mname++;
name = hname;
}
nentp = getnetbyname(name);
if (nentp != 0) {
in.s_addr = nentp->n_net;
} else if (inet_aton(name, &in) == 1) {
NTOHL(in.s_addr);
} else {
return 0;
}
if (mname == 0) {
mask = std_mask(in.s_addr);
if ((~mask & in.s_addr) != 0)
mask = 0xffffffff;
} else {
mask = (u_int)strtoul(mname, &p, 0);
if (*p != '\0' || mask > 32)
return 0;
mask = 0xffffffff << (32-mask);
}
rt->n_dst = htonl(in.s_addr);
rt->n_family = RIP_AF_INET;
rt->n_mask = htonl(mask);
return 1;
}
/* strtok(), but honoring backslash
*/
static int /* -1=bad */
parse_quote(char **linep,
const char *delims,
char *delimp,
char *buf,
int lim)
{
char c, *pc;
const char *p;
pc = *linep;
if (*pc == '\0')
return -1;
for (;;) {
if (lim == 0)
return -1;
c = *pc++;
if (c == '\0')
break;
if (c == '\\' && *pc != '\0') {
if ((c = *pc++) == 'n') {
c = '\n';
} else if (c == 'r') {
c = '\r';
} else if (c == 't') {
c = '\t';
} else if (c == 'b') {
c = '\b';
} else if (c >= '0' && c <= '7') {
c -= '0';
if (*pc >= '0' && *pc <= '7') {
c = (c<<3)+(*pc++ - '0');
if (*pc >= '0' && *pc <= '7')
c = (c<<3)+(*pc++ - '0');
}
}
} else {
for (p = delims; *p != '\0'; ++p) {
if (*p == c)
goto exit;
}
}
*buf++ = c;
--lim;
}
exit:
if (delimp != 0)
*delimp = c;
*linep = pc-1;
if (lim != 0)
*buf = '\0';
return 0;
}
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