andersk Git - moira.git/blame_incremental

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Commit	Line	Data
	1	/* $Id$
	2	*
	3	* Canonicalize a hostname
	4	*
	5	* Copyright (C) 1987-1998 by the Massachusetts Institute of Technology
	6	* For copying and distribution information, please see the file
	7	* <mit-copyright.h>.
	8	*/
	9
	10	#include <mit-copyright.h>
	11	#include <moira.h>
	12
	13	#include <sys/types.h>
	14
	15	#ifdef HAVE_UNAME
	16	#include <sys/utsname.h>
	17	#endif
	18
	19	#ifndef _WIN32
	20	#include <sys/socket.h>
	21	#include <netdb.h>
	22	#include <netinet/in.h>
	23	#endif /* _WIN32 */
	24
	25	#include <ctype.h>
	26	#include <stdio.h>
	27	#include <stdlib.h>
	28	#include <string.h>
	29
	30	RCSID("$Header$");
	31
	32	static struct hostent *local_gethostbyname(void)
	33	{
	34	#ifdef HAVE_UNAME
	35	struct utsname name;
	36	uname(&name);
	37	return gethostbyname(name.nodename);
	38	#else
	39	char hostname[128];
	40	gethostname(hostname, sizeof(hostname));
	41	hostname[sizeof(hostname)-1] = 0;
	42	return gethostbyname(hostname);
	43	#endif
	44	}
	45
	46	static char *local_domain(void)
	47	{
	48	static char *domain = NULL;
	49	char *cp;
	50	struct hostent *hp;
	51
	52	if (domain == NULL)
	53	{
	54	char hostbuf[256];
	55
	56	if (mr_host(hostbuf, sizeof(hostbuf)) == MR_SUCCESS)
	57	{
	58	cp = strchr(hostbuf, '.');
	59	if (cp)
	60	domain = strdup(++cp);
	61	}
	62	else
	63	{
	64	hp = local_gethostbyname();
	65	if (hp)
	66	{
	67	cp = strchr(hp->h_name, '.');
	68	if (cp)
	69	domain = strdup(++cp);
	70	}
	71	}
	72	if (!domain)
	73	domain = "";
	74	}
	75
	76	return domain;
	77	}
	78
	79	/*
	80	* Canonicalize hostname:
	81	* if it is in double-quotes, then strip the quotes and return the name.
	82	* if it is in the namespace, call the nameserver to expand it
	83	* otherwise uppercase it and append the default domain (using an, er,
	84	* undocumented global of the nameserver).
	85	*
	86	* Assumes that host was allocated using malloc(); it may be freed or
	87	* realloc'ed, so the old pointer should not be considered valid.
	88	*/
	89
	90	char canonicalize_hostname(char host)
	91	{
	92	struct hostent *hp;
	93	int len;
	94	char tbuf, cp;
	95
	96	len = strlen(host);
	97	if (len > 2 && host[0] == '"' && host[len - 1] == '"')
	98	{
	99	tbuf = malloc(len - 1);
	100	if (!tbuf)
	101	return NULL;
	102	strncpy(tbuf, host + 1, len - 2);
	103	tbuf[len - 2] = '\0';
	104	free(host);
	105	return tbuf;
	106	}
	107
	108	if (strchr(host, '') \|\| strchr(host, '?') \|\| host == '[')
	109	return host;
	110
	111	hp = gethostbyname(host);
	112
	113	if (hp)
	114	{
	115	host = realloc(host, strlen(hp->h_name) + 1);
	116	if (host)
	117	strcpy(host, hp->h_name);
	118	return host;
	119	}
	120	else
	121	{
	122	/* can't get name from nameserver; fix up the format a bit */
	123	cp = strchr(host, '.');
	124	if (!cp)
	125	{
	126	tbuf = malloc(strlen(host) + strlen(local_domain()) + 2);
	127	if (!tbuf)
	128	return NULL;
	129	sprintf(tbuf, "%s.%s", host, local_domain());
	130	free(host);
	131	host = tbuf;
	132	}
	133	else if (strcasecmp(cp + 1, local_domain()) != 0)
	134	return host;
	135
	136	/* This is a host in our local domain, so capitalize it. */
	137	for (cp = host; *cp; cp++)
	138	cp = toupper(cp);
	139	return host;
	140	}
	141	}