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Monster Media 1993 #2
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ham
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k5jb.zip
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K5JB.K28
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netuser.c
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C/C++ Source or Header
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1992-09-05
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4KB
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195 lines
/* Miscellaneous format conversion subroutines */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "sokname.h" /* for SOKNAME - N5OWK */
#include "global.h"
#include "netuser.h"
#ifdef UNIX
#include "unix.h"
#endif /* UNIX */
int net_error;
#define LINELEN 80
/* Convert Internet address in ascii dotted-decimal format (44.0.0.1) to
* binary IP address
*/
int32
aton(s)
register char *s;
{
int32 n;
int atoi();
register int i;
n = 0;
for(i=24;i>=0;i -= 8){
n |= (int32)atoi(s) << i;
if((s = index(s,'.')) == NULLCHAR)
break;
s++;
}
return n;
}
/* Resolve a host name into an IP address. IP addresses in dotted-decimal
* notation are distinguished from domain names by enclosing them in
* brackets, e.g., [44.64.0.1]
*/
int32
resolve(host)
char *host;
{
register char *cp;
int32 addr;
char hostent[LINELEN];
FILE *sfile;
static struct {
char *name;
int32 address;
} cache;
void rip(), free();
if(*host == '['){
/* Brackets indicate IP address in dotted-decimal form */
return aton(host + 1);
}
if(isdigit(*host))
return aton(host);
if(cache.name != NULLCHAR && strcmp(cache.name,host) == 0)
return cache.address;
/* Not a numerical IP address, search the host table */
if((sfile = fopen(hosts,"r")) == NULLFILE){
return 0;
}
while (!feof(sfile)){
fgets(hostent,LINELEN,sfile);
rip(hostent);
cp = hostent;
if(*cp == '#' || !isdigit(*cp))
continue; /* Comment or invalid line */
cp = strtok(cp," \t");
addr = aton(cp);
while(cp != NULLCHAR){
cp = strtok(NULLCHAR," \t");
if(strcmp(host,cp) == 0){
/* Found it, put in cache */
fclose(sfile);
if(cache.name != NULLCHAR)
free(cache.name);
cache.name = malloc((unsigned)strlen(host)+1);
strcpy(cache.name,host);
cache.address = addr;
return cache.address;
}
/* That one didn't match, try the next one */
}
}
/* No address found */
fclose(sfile);
return 0;
}
/* Convert an internet address (in host byte order) to a dotted decimal ascii
* string, e.g., 255.255.255.255\0
*/
char *
inet_ntoa(a)
int32 a;
{
static char buf[16];
sprintf(buf,"%u.%u.%u.%u",
hibyte(hiword(a)),
lobyte(hiword(a)),
hibyte(loword(a)),
lobyte(loword(a)) );
return buf;
}
/* Convert a socket (address + port) to an ascii string of the form
* aaa.aaa.aaa.aaa:ppppp
*/
char *
psocket(s)
struct socket *s;
{
static char buf[30];
sprintf(buf,"%s:%u",inet_ntoa(s->address),s->port);
return buf;
}
#ifdef SOKNAME
/* Convert a socket (address + port) to an ascii string of the form
* n5owk.okla.ampr:pppppppp
*/
#define POSITION 2 /* position of returned label in hosts.net file */
char *
puname(s)
struct socket *s;
{
register int i;
static char buf[25]; /* printf in caller only will do 24 chars */
char *cp, *cpt,*psocket(); /* but that would leave no space between */
char hostent[LINELEN]; /* port and next field so shortened return */
FILE *sfile; /* string by one character below */
char *tcp_port();
extern int issok;
void rip();
if(issok){ /* it may be turned off by sokname command */
strncpy(buf,inet_ntoa(s->address),16);
i = strlen(buf);
if ((sfile = fopen(hosts,"r")) == NULLFILE)
return NULLCHAR;
while (!feof(sfile)){
fgets(hostent,LINELEN,sfile);
if(hostent[0] == '#' || !isdigit(hostent[0]))
continue; /* Comment or invalid line */
if(strncmp(buf,hostent,i) != 0) /* this requires IP address be */
continue; /* left justified in file */
fclose(sfile);
rip(hostent);
cp = hostent;
for(i = 0,cp = strtok(cp," \t");cp != NULLCHAR && i < POSITION;i++){
cpt = cp;
cp = strtok(NULLCHAR," \t");
}
if(cp == NULLCHAR)
cp = cpt;
cp[15] = '\0'; /* in case cp was gross - size restricted for */
sprintf(buf,"%s:%s", cp, tcp_port(s->port)); /* screen cosmetics */
return buf; /* in tcpcmd.c, port is max of 8 chars */
}
/* No address found */
fclose(sfile);
}
cp = psocket(s); /* punt, never heard of em - or sokname may be off */
return cp;
}
#endif
/* Convert hex-ascii string to long integer */
long
htol(s)
char *s;
{
long ret;
char c;
ret = 0;
while((c = *s++) != '\0'){
#if (!ATARI_ST && !LATTICE) /* DG2KK "ik versta er heelemal niets van!" */
c &= 0x7f;
#endif
if(c >= '0' && c <= '9')