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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/bsd/gethostbyname.c – Rev 2

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/* posix */
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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/* bsd extensions */
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include "priv.h"
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int h_errno;
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enum
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{
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	Nname= 6,
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};
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/*
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 *  for inet addresses only
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 */
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struct hostent*
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gethostbyname(const char *name)
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{
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	int i, t, fd, m;
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	char *p, *bp;
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	int nn, na;
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	unsigned long x;
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	static struct hostent h;
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	static char buf[1024];
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	static char *nptr[Nname+1];
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	static char *aptr[Nname+1];
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	static char addr[Nname][4];
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	h.h_name = 0;
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	t = _sock_ipattr(name);
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	/* connect to server */
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	fd = open("/net/cs", O_RDWR);
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	if(fd < 0){
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		_syserrno();
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		h_errno = NO_RECOVERY;
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		return 0;
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	}
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	/* construct the query, always expect an ip# back */
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	switch(t){
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	case Tsys:
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		snprintf(buf, sizeof buf, "!sys=%s ip=*", name);
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		break;
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	case Tdom:
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		snprintf(buf, sizeof buf, "!dom=%s ip=*", name);
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		break;
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	case Tip:
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		snprintf(buf, sizeof buf, "!ip=%s", name);
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		break;
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	}
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	/* query the server */
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	if(write(fd, buf, strlen(buf)) < 0){
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		_syserrno();
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		h_errno = TRY_AGAIN;
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		return 0;
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	}
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	lseek(fd, 0, 0);
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	for(i = 0; i < sizeof(buf)-1; i += m){
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		m = read(fd, buf+i, sizeof(buf) - 1 - i);
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		if(m <= 0)
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			break;
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		buf[i+m++] = ' ';
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	}
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	close(fd);
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	buf[i] = 0;
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	/* parse the reply */
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	nn = na = 0;
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	for(bp = buf;;){
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		p = strchr(bp, '=');
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		if(p == 0)
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			break;
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		*p++ = 0;
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		if(strcmp(bp, "dom") == 0){
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			if(h.h_name == 0)
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				h.h_name = p;
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			if(nn < Nname)
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				nptr[nn++] = p;
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		} else if(strcmp(bp, "sys") == 0){
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			if(nn < Nname)
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				nptr[nn++] = p;
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		} else if(strcmp(bp, "ip") == 0){
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			x = inet_addr(p);
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			x = ntohl(x);
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			if(na < Nname){
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				addr[na][0] = x>>24;
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				addr[na][1] = x>>16;
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				addr[na][2] = x>>8;
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				addr[na][3] = x;
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				aptr[na] = addr[na];
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				na++;
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			}
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		}
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		while(*p && *p != ' ')
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			p++;
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		if(*p)
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			*p++ = 0;
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		bp = p;
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	}
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	if(nn+na == 0){
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		h_errno = HOST_NOT_FOUND;
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		return 0;
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	}
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	nptr[nn] = 0;
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	aptr[na] = 0;
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	h.h_aliases = nptr;
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	h.h_addr_list = aptr;
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	h.h_length = 4;
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	h.h_addrtype = AF_INET;
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	if(h.h_name == 0)
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		h.h_name = nptr[0];
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	if(h.h_name == 0)
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		h.h_name = aptr[0];
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	return &h;
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}