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Add (substantially re-written) support for /etc/host.conf, and reintegrated
1.1.5 support for YP, fixing a bug in 1.1.5 that prevented YP from ever working reliably. (I'm amazed that there were no bug reports.) IWBRNI someone could write a host.conf(5) manual page. Please look at the code before doing so; this version is somewhat more flexible in the format of its input.
This commit is contained in:
Garrett Wollman
parent
7dc2bee339
commit
b42815434e
1 changed files with 196 additions and 11 deletions
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@ -52,8 +52,10 @@
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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static char rcsid[] = "$Id: gethnamaddr.c,v 4.9.1.1 1993/05/02 22:43:03 vixie Rel $";
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static char sccsid[] = "From: @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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/*static char rcsid[] = "From: Id: gethnamaddr.c,v 4.9.1.1 1993/05/02 22:43:03 vixie Rel ";*/
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static const char rcsid[] =
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"$Id$";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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@ -71,6 +73,35 @@ static char rcsid[] = "$Id: gethnamaddr.c,v 4.9.1.1 1993/05/02 22:43:03 vixie Re
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#define MAXALIASES 35
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#define MAXADDRS 35
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#define _PATH_HOSTCONF "/etc/host.conf"
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enum service_type {
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SERVICE_NONE = 0,
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SERVICE_BIND,
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SERVICE_HOSTS,
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SERVICE_NIS };
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#define SERVICE_MAX SERVICE_NIS
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static struct {
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const char *name;
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enum service_type type;
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} service_names[] = {
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{ "hosts", SERVICE_HOSTS },
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{ "/etc/hosts", SERVICE_HOSTS },
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{ "hosttable", SERVICE_HOSTS },
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{ "htable", SERVICE_HOSTS },
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{ "bind", SERVICE_BIND },
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{ "dns", SERVICE_BIND },
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{ "domain", SERVICE_BIND },
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{ "yp", SERVICE_NIS },
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{ "yellowpages", SERVICE_NIS },
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{ "nis", SERVICE_NIS },
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{ 0, SERVICE_NONE }
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};
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static enum service_type service_order[SERVICE_MAX + 1];
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static int service_done = 0;
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static char *h_addr_ptrs[MAXADDRS + 1];
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static struct hostent host;
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@ -81,7 +112,6 @@ static FILE *hostf = NULL;
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static char hostaddr[MAXADDRS];
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static char *host_addrs[2];
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static int stayopen = 0;
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char *strpbrk();
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#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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@ -101,6 +131,49 @@ typedef union {
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extern int h_errno;
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static enum service_type
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get_service_name(const char *name) {
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int i;
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for(i = 0; service_names[i].type != SERVICE_NONE; i++) {
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if(!strcasecmp(name, service_names[i].name)) {
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return service_names[i].type;
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}
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}
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return SERVICE_NONE;
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}
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static void
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init_services()
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{
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char *cp, buf[BUFSIZ];
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register int cc = 0;
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FILE *fd;
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if ((fd = (FILE *)fopen(_PATH_HOSTCONF, "r")) == NULL) {
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/* make some assumptions */
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service_order[0] = SERVICE_BIND;
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service_order[1] = SERVICE_HOSTS;
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service_order[2] = SERVICE_NONE;
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} else {
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while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {
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if(buf[0] == '#')
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continue;
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cp = strtok(buf, "\n \t,:;");
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do {
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if(!isalpha(cp[0])) continue;
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service_order[cc] = get_service_name(buf);
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if(service_order[cc] != SERVICE_NONE)
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cc++;
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} while((cp = strtok((char *)0, "\n \t,:;"))
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&& (cc < SERVICE_MAX));
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}
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service_order[cc] = SERVICE_NONE;
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fclose(fd);
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}
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service_done = 1;
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}
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static struct hostent *
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getanswer(answer, anslen, iquery)
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querybuf *answer;
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@ -246,7 +319,7 @@ getanswer(answer, anslen, iquery)
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}
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struct hostent *
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gethostbyname(name)
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_getdnsbyname(name)
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const char *name;
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{
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querybuf buf;
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@ -295,16 +368,13 @@ gethostbyname(name)
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if (_res.options & RES_DEBUG)
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printf("res_search failed\n");
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#endif
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if (errno == ECONNREFUSED)
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return (_gethtbyname(name));
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else
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return ((struct hostent *) NULL);
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return ((struct hostent *) NULL);
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}
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return (getanswer(&buf, n, 0));
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}
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struct hostent *
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gethostbyaddr(addr, len, type)
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_getdnsbyaddr(addr, len, type)
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const char *addr;
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int len, type;
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{
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@ -327,8 +397,6 @@ gethostbyaddr(addr, len, type)
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if (_res.options & RES_DEBUG)
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printf("res_query failed\n");
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#endif
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if (errno == ECONNREFUSED)
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return (_gethtbyaddr(addr, len, type));
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return ((struct hostent *) NULL);
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}
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hp = getanswer(&buf, n, 1);
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@ -450,3 +518,120 @@ _gethtbyaddr(addr, len, type)
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_endhtent();
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return (p);
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}
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#ifdef YP
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struct hostent *
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_getnishost(name, map)
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char *name, *map;
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{
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register char *cp, *dp, **q;
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char *result;
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int resultlen;
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static struct hostent h;
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static char *domain = (char *)NULL;
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if (domain == (char *)NULL)
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if (yp_get_default_domain (&domain))
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return ((struct hostent *)NULL);
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if (yp_match(domain, map, name, strlen(name), &result, &resultlen))
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return ((struct hostent *)NULL);
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if (cp = index(result, '\n'))
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*cp = '\0';
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cp = strpbrk(result, " \t");
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*cp++ = '\0';
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#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
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h.h_addr_list = host_addrs;
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#endif
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h.h_addr = hostaddr;
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*((u_long *)h.h_addr) = inet_addr(result);
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h.h_length = sizeof(u_long);
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h.h_addrtype = AF_INET;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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h.h_name = cp;
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q = h.h_aliases = host_aliases;
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cp = strpbrk(cp, " \t");
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if (cp != NULL)
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*cp++ = '\0';
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while (cp && *cp) {
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if (*cp == ' ' || *cp == '\t') {
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cp++;
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continue;
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}
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if (q < &host_aliases[MAXALIASES - 1])
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*q++ = cp;
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cp = strpbrk(cp, " \t");
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if (cp != NULL)
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*cp++ = '\0';
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}
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*q = NULL;
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return (&h);
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}
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#endif /* YP */
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struct hostent *
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gethostbyname(const char *name)
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{
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struct hostent *hp = 0;
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int nserv = 0;
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if(!service_done) {
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init_services();
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}
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while(!hp) {
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switch(service_order[nserv]) {
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case SERVICE_NONE:
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return 0;
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case SERVICE_HOSTS:
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hp = _gethtbyname(name);
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break;
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case SERVICE_BIND:
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hp = _getdnsbyname(name);
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break;
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case SERVICE_NIS:
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#ifdef YP
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hp = _getnishost(name, "hosts.byname");
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#endif
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break;
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}
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nserv++;
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}
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return hp;
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}
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struct hostent *
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gethostbyaddr(const char *addr, int len, int type)
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{
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struct hostent *hp = 0;
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int nserv = 0;
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if(!service_done) {
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init_service();
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}
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while(!hp) {
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switch(service_order[nserv]) {
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case SERVICE_NONE:
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return 0;
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case SERVICE_HOSTS:
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hp = _gethtbyaddr(addr, len, type);
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break;
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case SERVICE_BIND:
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hp = _getdnsbyname(addr, len, type);
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break;
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case SERVICE_NIS:
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#ifdef YP
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hp = _getnishost(addr, "hosts.byaddr");
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#endif
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break;
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}
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nserv++;
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}
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return hp;
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}
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