[icmp-dn.git] / src / nss-icmp.c

/*
 *  nss-icmp or libnss_icmp - GNU C Library NSS module to query host
 *  names by ICMP.
 *  Copyright (C) 2005 Fredrik Tolf <fredrik@dolda2000.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 *  MA 02111-1307, USA
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <nss.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/wait.h>
#include "config.h"

#ifndef	CONFIGFILE
#define CONFIGFILE "/etc/nss-icmp.conf"
#endif

#if 0
#define DEBUGP(format...) fprintf(stderr, "nss-icmp: " format);
#else
#define DEBUGP(format...)
#endif

struct cache {
    struct cache *next, *prev;
    char *addr;
    socklen_t addrlen;
    int af;
    int notfound;
    char **names;
    time_t at, ttl;
};

static int inited = 0;
static int timeout = -1;
static int usecache = 1;
static time_t nfttl = 300;
static struct cache *cache = NULL;

static void readconfig(void)
{
    FILE *f;
    char linebuf[1024];
    char *p, *p2;
    
    if((f = fopen(CONFIGFILE, "r")) == NULL)
	return;
    
    while(fgets(linebuf, sizeof(linebuf), f) != NULL) {
	if(linebuf[0] == '#')
	    continue;
	if((p = strchr(linebuf, '\n')) != NULL)
	    *p = 0;
	if((p = strchr(linebuf, ' ')) != NULL) {
	    p2 = p + 1;
	    *p = 0;
	}
	if(!strcmp(linebuf, "timeout")) {
	    if(p2 == NULL)
		continue;
	    timeout = atoi(p2);
	}
	if(!strcmp(linebuf, "ttlnotfound")) {
	    if(p2 == NULL)
		continue;
	    nfttl = atoi(p2);
	}
	if(!strcmp(linebuf, "nocache")) {
	    usecache = 0;
	}
    }
    
    fclose(f);
}

static void freecache(struct cache *cc)
{
    int i;
    
    if(cc->next != NULL)
	cc->next->prev = cc->prev;
    if(cc->prev != NULL)
	cc->prev->next = cc->next;
    if(cc == cache)
	cache = cc->next;
    if(cc->addr != NULL)
	free(cc->addr);
    if(cc->names != NULL) {
	for(i = 0; cc->names[i] != NULL; i++)
	    free(cc->names[i]);
	free(cc->names);
    }
    free(cc);
}

static void cachenotfound(const void *addr, socklen_t len, int af, time_t ttl)
{
    struct cache *cc;
    
    for(cc = cache; cc != NULL; cc = cc->next) {
	if((cc->af == af) && (cc->addrlen == len) && !memcmp(cc->addr, addr, len))
	    break;
    }
    if(cc == NULL) {
	if((cc = malloc(sizeof(*cc))) == NULL)
	    return;
	memset(cc, 0, sizeof(*cc));
	if((cc->addr = malloc(len)) == NULL) {
	    freecache(cc);
	    return;
	}
	memcpy(cc->addr, addr, len);
	cc->addrlen = len;
	cc->af = af;
	cc->at = time(NULL);
	cc->ttl = ttl;
	
	cc->notfound = 1;
	
	cc->next = cache;
	if(cache != NULL)
	    cache->prev = cc;
	cache = cc;
    }
}

static void updatecache(const void *addr, socklen_t len, int af, char **names, time_t ttl)
{
    int i;
    struct cache *cc;
    
    for(cc = cache; cc != NULL; cc = cc->next) {
	if((cc->af == af) && (cc->addrlen == len) && !memcmp(cc->addr, addr, len))
	    break;
    }
    if(cc == NULL) {
	if((cc = malloc(sizeof(*cc))) == NULL)
	    return;
	memset(cc, 0, sizeof(*cc));
	if((cc->addr = malloc(len)) == NULL) {
	    freecache(cc);
	    return;
	}
	memcpy(cc->addr, addr, len);
	cc->addrlen = len;
	cc->af = af;
	cc->at = time(NULL);
	cc->ttl = ttl;
	
	for(i = 0; names[i] != NULL; i++);
	if((cc->names = malloc(sizeof(*(cc->names)) * (i + 1))) == NULL) {
	    freecache(cc);
	    return;
	}
	memset(cc->names, 0, sizeof(*(cc->names)) * (i + 1));
	for(i = 0; names[i] != NULL; i++) {
	    if((cc->names[i] = malloc(strlen(names[i]) + 1)) == NULL) {
		freecache(cc);
		return;
	    }
	    strcpy(cc->names[i], names[i]);
	}
	
	cc->next = cache;
	if(cache != NULL)
	    cache->prev = cc;
	cache = cc;
    }
}

static void expirecache(void)
{
    struct cache *cc, *next;
    time_t now;
    
    now = time(NULL);
    for(cc = cache; cc != NULL; cc = next) {
	next = cc->next;
	if(now - cc->at > cc->ttl) {
	    freecache(cc);
	    continue;
	}
    }
}

enum nss_status _nss_icmp_gethostbyaddr_r(const void *addr, socklen_t len, int af, struct hostent *result, char *buffer, size_t buflen, int *errnop, int *h_errnop)
{
    int i, ret;
    struct retstruct {
	char *aliaslist[16];
	char *addrlist[2];
	char retaddr[16];
    } *retbuf;
    char addrbuf[1024];
    int an, thislen, ttl;
    char *p, *p2, *p3;
    u_int8_t *ap;
    pid_t child;
    int pfd[2];
    int rl;
    int status;
    struct cache *cc;
    
    if(!inited) {
	readconfig();
	inited = 1;
    }
    
    retbuf = (struct retstruct *)buffer;
    if((buflen < sizeof(*retbuf)) || (len > sizeof(retbuf->retaddr))) {
	*errnop = ENOMEM;
	*h_errnop = NETDB_INTERNAL;
	return(NSS_STATUS_UNAVAIL);
    }
    
    DEBUGP("starting lookup\n");
    
    if(usecache) {
	expirecache();
	for(cc = cache; cc != NULL; cc = cc->next) {
	    if((cc->af == af) && (cc->addrlen == len) && !memcmp(cc->addr, addr, len))
		break;
	}
    } else {
	cc = NULL;
    }
    
    if(cc == NULL) {
	DEBUGP("address not in cache, looking up for real\n");
	ap = (u_int8_t *)addr;
	if(inet_ntop(af, addr, addrbuf, sizeof(addrbuf)) == NULL) {
	    *errnop = errno;
	    *h_errnop = NETDB_INTERNAL;
	    return(NSS_STATUS_UNAVAIL);
	}
	DEBUGP("address is %s\n", addrbuf);
    
	if(pipe(pfd)) {
	    *errnop = errno;
	    *h_errnop = NETDB_INTERNAL;
	    return(NSS_STATUS_UNAVAIL);
	}
	/* I honestly don't know if it is considered OK to fork in other
	 * people's programs. We need a SUID worker, though, so there's
	 * little choice that I can see. */
	if((child = fork()) < 0) {
	    *errnop = errno;
	    *h_errnop = NETDB_INTERNAL;
	    return(NSS_STATUS_UNAVAIL);
	}
    
	if(child == 0) {
	    int i, fd;
	    char timeoutbuf[128];
	
	    if((fd = open("/dev/null", O_WRONLY)) < 0)
		exit(127);
	    close(pfd[0]);
	    dup2(pfd[1], 1);
	    dup2(fd, 2);
	    for(i = 3; i < FD_SETSIZE; i++)
		close(i);
	
	    if(timeout != -1) {
		snprintf(timeoutbuf, sizeof(timeoutbuf), "%i", timeout);
		execlp("idnlookup", "idnlookup", "-Tt", timeoutbuf, addrbuf, NULL);
	    } else {
		execlp("idnlookup", "idnlookup", "-T", addrbuf, NULL);
	    }
	    exit(127);
	}
    
	close(pfd[1]);
    
	rl = 0;
	do {
	    ret = read(pfd[0], addrbuf + rl, sizeof(addrbuf) - rl);
	    if(ret < 0) {
		*errnop = errno;
		*h_errnop = NETDB_INTERNAL;
		close(pfd[0]);
		return(NSS_STATUS_UNAVAIL);
	    }
	    rl += ret;
	    if(rl >= sizeof(addrbuf) - 1) {
		*errnop = ENOMEM;
		*h_errnop = NETDB_INTERNAL;
		close(pfd[0]);
		return(NSS_STATUS_UNAVAIL);
	    }
	} while(ret != 0);
	addrbuf[rl] = 0;
	close(pfd[0]);
	
	waitpid(child, &status, 0);
	
	if((p = strchr(addrbuf, '\n')) == NULL) {
	    if(usecache)
		cachenotfound(addr, len, af, nfttl);
	    *h_errnop = TRY_AGAIN; /* XXX: Is this correct? */
	    return(NSS_STATUS_NOTFOUND);
	}
	*(p++) = 0;
	ttl = atoi(addrbuf);
	
	an = 0;
	p3 = buffer + sizeof(*retbuf);
	while((p2 = strchr(p, '\n')) != NULL) {
	    *p2 = 0;
	    thislen = p2 - p;
	    if(thislen == 0)
		continue;
	    if((p3 - buffer) + thislen + 1 > buflen) {
		*errnop = ENOMEM;
		*h_errnop = NETDB_INTERNAL;
		return(NSS_STATUS_UNAVAIL);
	    }
	    memcpy(p3, p, thislen + 1);
	    retbuf->aliaslist[an] = p3;
	    p3 += thislen + 1;
	    p = p2 + 1;
	    if(++an == 16) {
		*errnop = ENOMEM;
		*h_errnop = NETDB_INTERNAL;
		return(NSS_STATUS_UNAVAIL);
	    }
	}
	if(an == 0) {
	    if(usecache)
		cachenotfound(addr, len, af, nfttl);
	    *h_errnop = TRY_AGAIN; /* XXX: Is this correct? */
	    return(NSS_STATUS_NOTFOUND);
	}
	retbuf->aliaslist[an] = NULL;
	
	if(usecache)
	    updatecache(addr, len, af, retbuf->aliaslist, ttl);
    } else {
	DEBUGP("address found in cache\n");
	if(cc->notfound) {
	    *h_errnop = TRY_AGAIN; /* XXX: Is this correct? */
	    return(NSS_STATUS_NOTFOUND);
	}
	
	p3 = buffer + sizeof(*retbuf);
	for(i = 0; cc->names[i] != NULL; i++) {
	    thislen = strlen(cc->names[i]);
	    DEBUGP("filling in address %s, length %i\n", cc->names[i], thislen);
	    if((p3 - buffer) + thislen + 1 > buflen) {
		*errnop = ENOMEM;
		*h_errnop = NETDB_INTERNAL;
		return(NSS_STATUS_UNAVAIL);
	    }
	    memcpy(p3, cc->names[i], thislen + 1);
	    retbuf->aliaslist[i] = p3;
	    p3 += thislen + 1;
	}
	retbuf->aliaslist[i] = NULL;
    }
    
    DEBUGP("returning hostent\n");
    memcpy(retbuf->retaddr, addr, len);
    retbuf->addrlist[0] = retbuf->retaddr;
    retbuf->addrlist[1] = NULL;
    result->h_name = retbuf->aliaslist[0];
    result->h_aliases = retbuf->aliaslist;
    result->h_addr_list = retbuf->addrlist;
    result->h_addrtype = af;
    result->h_length = len;
    
    *h_errnop = NETDB_SUCCESS;
    DEBUGP("returning\n");
    return(NSS_STATUS_SUCCESS);
}

/*
 * Local Variables:
 * compile-command: "gcc -shared -Wall -g -o libnss_icmp.so.2 nss-icmp.c"
 * End:
 */
Commit	Line	Data
732b8359 DC	1	/*
	2	* nss-icmp or libnss_icmp - GNU C Library NSS module to query host
	3	* names by ICMP.
	4	* Copyright (C) 2005 Fredrik Tolf <fredrik@dolda2000.com>
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Library General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Library General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Library General Public
	17	* License along with this library; if not, write to the Free
	18	* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
	19	* MA 02111-1307, USA
	20	*/
	21
2dec74ab DC	22	#include <stdlib.h>
	23	#include <stdio.h>
	24	#include <unistd.h>
	25	#include <string.h>
	26	#include <errno.h>
f0df8f66	27	#include <time.h>
2dec74ab DC	28	#include <sys/socket.h>
	29	#include <netinet/in.h>
	30	#include <netdb.h>
	31	#include <arpa/inet.h>
	32	#include <nss.h>
	33	#include <sys/types.h>
	34	#include <fcntl.h>
46c36380	35	#include <sys/wait.h>
2269406c	36	#include "config.h"
2dec74ab	37
2269406c	38	#ifndef CONFIGFILE
15a913c2	39	#define CONFIGFILE "/etc/nss-icmp.conf"
2269406c DC	40	#endif
2269406c DC	41
78d913fb DC	42	#if 0
	43	#define DEBUGP(format...) fprintf(stderr, "nss-icmp: " format);
	44	#else
	45	#define DEBUGP(format...)
	46	#endif
15a913c2 DC	47
	48	struct cache {
	49	struct cache next, prev;
	50	char *addr;
	51	socklen_t addrlen;
	52	int af;
	53	int notfound;
	54	char **names;
f0df8f66	55	time_t at, ttl;
15a913c2 DC	56	};
	57
	58	static int inited = 0;
	59	static int timeout = -1;
	60	static int usecache = 1;
f0df8f66	61	static time_t nfttl = 300;
15a913c2 DC	62	static struct cache *cache = NULL;
	63
	64	static void readconfig(void)
	65	{
	66	FILE *f;
	67	char linebuf[1024];
	68	char p, p2;
	69
	70	if((f = fopen(CONFIGFILE, "r")) == NULL)
	71	return;
	72
	73	while(fgets(linebuf, sizeof(linebuf), f) != NULL) {
	74	if(linebuf[0] == '#')
	75	continue;
	76	if((p = strchr(linebuf, '\n')) != NULL)
	77	*p = 0;
	78	if((p = strchr(linebuf, ' ')) != NULL) {
	79	p2 = p + 1;
	80	*p = 0;
	81	}
	82	if(!strcmp(linebuf, "timeout")) {
	83	if(p2 == NULL)
	84	continue;
	85	timeout = atoi(p2);
	86	}
f0df8f66 DC	87	if(!strcmp(linebuf, "ttlnotfound")) {
	88	if(p2 == NULL)
	89	continue;
	90	nfttl = atoi(p2);
	91	}
15a913c2 DC	92	if(!strcmp(linebuf, "nocache")) {
	93	usecache = 0;
	94	}
	95	}
	96
	97	fclose(f);
	98	}
	99
	100	static void freecache(struct cache *cc)
	101	{
	102	int i;
	103
	104	if(cc->next != NULL)
	105	cc->next->prev = cc->prev;
	106	if(cc->prev != NULL)
	107	cc->prev->next = cc->next;
	108	if(cc == cache)
	109	cache = cc->next;
	110	if(cc->addr != NULL)
	111	free(cc->addr);
	112	if(cc->names != NULL) {
	113	for(i = 0; cc->names[i] != NULL; i++)
	114	free(cc->names[i]);
	115	free(cc->names);
	116	}
	117	free(cc);
	118	}
	119
f0df8f66	120	static void cachenotfound(const void *addr, socklen_t len, int af, time_t ttl)
15a913c2 DC	121	{
	122	struct cache *cc;
	123
	124	for(cc = cache; cc != NULL; cc = cc->next) {
	125	if((cc->af == af) && (cc->addrlen == len) && !memcmp(cc->addr, addr, len))
	126	break;
	127	}
	128	if(cc == NULL) {
	129	if((cc = malloc(sizeof(*cc))) == NULL)
	130	return;
	131	memset(cc, 0, sizeof(*cc));
	132	if((cc->addr = malloc(len)) == NULL) {
	133	freecache(cc);
	134	return;
	135	}
	136	memcpy(cc->addr, addr, len);
	137	cc->addrlen = len;
	138	cc->af = af;
f0df8f66 DC	139	cc->at = time(NULL);
f0df8f66 DC	140	cc->ttl = ttl;
15a913c2 DC	141
	142	cc->notfound = 1;
	143
	144	cc->next = cache;
	145	if(cache != NULL)
	146	cache->prev = cc;
	147	cache = cc;
	148	}
	149	}
	150
f0df8f66	151	static void updatecache(const void addr, socklen_t len, int af, char *names, time_t ttl)
15a913c2 DC	152	{
	153	int i;
	154	struct cache *cc;
	155
	156	for(cc = cache; cc != NULL; cc = cc->next) {
f0df8f66	157	if((cc->af == af) && (cc->addrlen == len) && !memcmp(cc->addr, addr, len))
15a913c2 DC	158	break;
	159	}
	160	if(cc == NULL) {
	161	if((cc = malloc(sizeof(*cc))) == NULL)
	162	return;
	163	memset(cc, 0, sizeof(*cc));
f0df8f66	164	if((cc->addr = malloc(len)) == NULL) {
15a913c2 DC	165	freecache(cc);
	166	return;
	167	}
f0df8f66 DC	168	memcpy(cc->addr, addr, len);
	169	cc->addrlen = len;
	170	cc->af = af;
	171	cc->at = time(NULL);
	172	cc->ttl = ttl;
15a913c2	173
f0df8f66	174	for(i = 0; names[i] != NULL; i++);
15a913c2 DC	175	if((cc->names = malloc(sizeof((cc->names)) (i + 1))) == NULL) {
	176	freecache(cc);
	177	return;
	178	}
	179	memset(cc->names, 0, sizeof((cc->names)) (i + 1));
f0df8f66 DC	180	for(i = 0; names[i] != NULL; i++) {
f0df8f66 DC	181	if((cc->names[i] = malloc(strlen(names[i]) + 1)) == NULL) {
15a913c2 DC	182	freecache(cc);
	183	return;
	184	}
f0df8f66	185	strcpy(cc->names[i], names[i]);
15a913c2 DC	186	}
	187
	188	cc->next = cache;
	189	if(cache != NULL)
	190	cache->prev = cc;
	191	cache = cc;
	192	}
	193	}
	194
f0df8f66 DC	195	static void expirecache(void)
	196	{
	197	struct cache cc, next;
	198	time_t now;
	199
	200	now = time(NULL);
	201	for(cc = cache; cc != NULL; cc = next) {
	202	next = cc->next;
	203	if(now - cc->at > cc->ttl) {
	204	freecache(cc);
	205	continue;
	206	}
	207	}
	208	}
	209
2dec74ab DC	210	enum nss_status _nss_icmp_gethostbyaddr_r(const void addr, socklen_t len, int af, struct hostent result, char buffer, size_t buflen, int errnop, int *h_errnop)
2dec74ab DC	211	{
15a913c2	212	int i, ret;
2dec74ab DC	213	struct retstruct {
	214	char *aliaslist[16];
	215	char *addrlist[2];
	216	char retaddr[16];
	217	} *retbuf;
	218	char addrbuf[1024];
f0df8f66	219	int an, thislen, ttl;
2dec74ab DC	220	char p, p2, *p3;
	221	u_int8_t *ap;
	222	pid_t child;
	223	int pfd[2];
	224	int rl;
46c36380	225	int status;
15a913c2 DC	226	struct cache *cc;
	227
	228	if(!inited) {
	229	readconfig();
	230	inited = 1;
	231	}
2dec74ab DC	232
	233	retbuf = (struct retstruct *)buffer;
	234	if((buflen < sizeof(*retbuf)) \|\| (len > sizeof(retbuf->retaddr))) {
	235	*errnop = ENOMEM;
	236	*h_errnop = NETDB_INTERNAL;
	237	return(NSS_STATUS_UNAVAIL);
	238	}
	239
78d913fb DC	240	DEBUGP("starting lookup\n");
78d913fb DC	241
f416a8cd	242	if(usecache) {
f0df8f66	243	expirecache();
f416a8cd DC	244	for(cc = cache; cc != NULL; cc = cc->next) {
	245	if((cc->af == af) && (cc->addrlen == len) && !memcmp(cc->addr, addr, len))
	246	break;
	247	}
	248	} else {
	249	cc = NULL;
2dec74ab DC	250	}
2dec74ab DC	251
15a913c2	252	if(cc == NULL) {
78d913fb	253	DEBUGP("address not in cache, looking up for real\n");
15a913c2 DC	254	ap = (u_int8_t *)addr;
15a913c2 DC	255	if(inet_ntop(af, addr, addrbuf, sizeof(addrbuf)) == NULL) {
2dec74ab DC	256	*errnop = errno;
2dec74ab DC	257	*h_errnop = NETDB_INTERNAL;
2dec74ab DC	258	return(NSS_STATUS_UNAVAIL);
2dec74ab DC	259	}
78d913fb	260	DEBUGP("address is %s\n", addrbuf);
15a913c2 DC	261
	262	if(pipe(pfd)) {
	263	*errnop = errno;
2dec74ab	264	*h_errnop = NETDB_INTERNAL;
2dec74ab DC	265	return(NSS_STATUS_UNAVAIL);
2dec74ab DC	266	}
15a913c2 DC	267	/* I honestly don't know if it is considered OK to fork in other
	268	* people's programs. We need a SUID worker, though, so there's
	269	* little choice that I can see. */
	270	if((child = fork()) < 0) {
	271	*errnop = errno;
2dec74ab DC	272	*h_errnop = NETDB_INTERNAL;
	273	return(NSS_STATUS_UNAVAIL);
	274	}
15a913c2 DC	275
	276	if(child == 0) {
	277	int i, fd;
	278	char timeoutbuf[128];
	279
	280	if((fd = open("/dev/null", O_WRONLY)) < 0)
	281	exit(127);
	282	close(pfd[0]);
	283	dup2(pfd[1], 1);
	284	dup2(fd, 2);
	285	for(i = 3; i < FD_SETSIZE; i++)
	286	close(i);
	287
	288	if(timeout != -1) {
	289	snprintf(timeoutbuf, sizeof(timeoutbuf), "%i", timeout);
f0df8f66	290	execlp("idnlookup", "idnlookup", "-Tt", timeoutbuf, addrbuf, NULL);
15a913c2	291	} else {
f0df8f66	292	execlp("idnlookup", "idnlookup", "-T", addrbuf, NULL);
15a913c2 DC	293	}
	294	exit(127);
	295	}
	296
	297	close(pfd[1]);
	298
	299	rl = 0;
	300	do {
	301	ret = read(pfd[0], addrbuf + rl, sizeof(addrbuf) - rl);
	302	if(ret < 0) {
	303	*errnop = errno;
	304	*h_errnop = NETDB_INTERNAL;
	305	close(pfd[0]);
	306	return(NSS_STATUS_UNAVAIL);
	307	}
	308	rl += ret;
	309	if(rl >= sizeof(addrbuf) - 1) {
	310	*errnop = ENOMEM;
	311	*h_errnop = NETDB_INTERNAL;
	312	close(pfd[0]);
	313	return(NSS_STATUS_UNAVAIL);
	314	}
	315	} while(ret != 0);
	316	addrbuf[rl] = 0;
	317	close(pfd[0]);
f0df8f66	318
46c36380 DC	319	waitpid(child, &status, 0);
46c36380 DC	320
f0df8f66 DC	321	if((p = strchr(addrbuf, '\n')) == NULL) {
	322	if(usecache)
	323	cachenotfound(addr, len, af, nfttl);
	324	h_errnop = TRY_AGAIN; / XXX: Is this correct? */
	325	return(NSS_STATUS_NOTFOUND);
	326	}
	327	*(p++) = 0;
	328	ttl = atoi(addrbuf);
	329
15a913c2	330	an = 0;
15a913c2 DC	331	p3 = buffer + sizeof(*retbuf);
	332	while((p2 = strchr(p, '\n')) != NULL) {
	333	*p2 = 0;
	334	thislen = p2 - p;
	335	if(thislen == 0)
	336	continue;
	337	if((p3 - buffer) + thislen + 1 > buflen) {
	338	*errnop = ENOMEM;
	339	*h_errnop = NETDB_INTERNAL;
	340	return(NSS_STATUS_UNAVAIL);
	341	}
	342	memcpy(p3, p, thislen + 1);
	343	retbuf->aliaslist[an] = p3;
	344	p3 += thislen + 1;
	345	p = p2 + 1;
	346	if(++an == 16) {
	347	*errnop = ENOMEM;
	348	*h_errnop = NETDB_INTERNAL;
	349	return(NSS_STATUS_UNAVAIL);
	350	}
	351	}
	352	if(an == 0) {
f416a8cd	353	if(usecache)
f0df8f66	354	cachenotfound(addr, len, af, nfttl);
15a913c2 DC	355	h_errnop = TRY_AGAIN; / XXX: Is this correct? */
	356	return(NSS_STATUS_NOTFOUND);
	357	}
	358	retbuf->aliaslist[an] = NULL;
f0df8f66 DC	359
	360	if(usecache)
	361	updatecache(addr, len, af, retbuf->aliaslist, ttl);
15a913c2	362	} else {
78d913fb	363	DEBUGP("address found in cache\n");
15a913c2 DC	364	if(cc->notfound) {
	365	h_errnop = TRY_AGAIN; / XXX: Is this correct? */
	366	return(NSS_STATUS_NOTFOUND);
	367	}
	368
	369	p3 = buffer + sizeof(*retbuf);
	370	for(i = 0; cc->names[i] != NULL; i++) {
	371	thislen = strlen(cc->names[i]);
78d913fb	372	DEBUGP("filling in address %s, length %i\n", cc->names[i], thislen);
15a913c2 DC	373	if((p3 - buffer) + thislen + 1 > buflen) {
	374	*errnop = ENOMEM;
	375	*h_errnop = NETDB_INTERNAL;
	376	return(NSS_STATUS_UNAVAIL);
	377	}
	378	memcpy(p3, cc->names[i], thislen + 1);
78d913fb	379	retbuf->aliaslist[i] = p3;
15a913c2	380	p3 += thislen + 1;
2dec74ab	381	}
78d913fb	382	retbuf->aliaslist[i] = NULL;
2dec74ab	383	}
2dec74ab	384
78d913fb	385	DEBUGP("returning hostent\n");
2dec74ab DC	386	memcpy(retbuf->retaddr, addr, len);
	387	retbuf->addrlist[0] = retbuf->retaddr;
	388	retbuf->addrlist[1] = NULL;
	389	result->h_name = retbuf->aliaslist[0];
	390	result->h_aliases = retbuf->aliaslist;
	391	result->h_addr_list = retbuf->addrlist;
	392	result->h_addrtype = af;
	393	result->h_length = len;
	394
	395	*h_errnop = NETDB_SUCCESS;
78d913fb	396	DEBUGP("returning\n");
2dec74ab DC	397	return(NSS_STATUS_SUCCESS);
2dec74ab DC	398	}
732b8359 DC	399
	400	/*
	401	* Local Variables:
	402	* compile-command: "gcc -shared -Wall -g -o libnss_icmp.so.2 nss-icmp.c"
	403	* End:
	404	*/