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/* text2atm.c - Converts textual representation of ATM address to binary
encoding */
/* Written 1995-2000 by Werner Almesberger, EPFL-LRC/ICA */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include "atm.h"
#include "atmsap.h"
#include "atmres.h"
static int try_pvc(const char *text,struct sockaddr_atmpvc *addr,int flags)
{
int part[3];
int i;
part[0] = part[1] = part[2] = 0;
i = 0;
while (1) {
if (!*text) return FATAL; /* empty or ends with a dot */
if (i == 3) return TRY_OTHER; /* too long */
if (isdigit(*text)) {
if (*text == '0' && isdigit(text[1])) return TRY_OTHER;
/* no leading zeroes */
do {
if (part[i] > INT_MAX/10) return TRY_OTHER;/* number too big */
part[i] = part[i]*10+*text++-'0';
}
while (isdigit(*text));
i++;
if (!*text) break;
if (*text++ != '.') return TRY_OTHER; /* non-PVC character */
continue;
}
if (*text == '*') {
if (!(flags & T2A_WILDCARD)) return FATAL; /* not allowed */
part[i++] = ATM_ITF_ANY; /* all *_ANY have the same value */
}
else {
if (*text != '?') return TRY_OTHER; /* invalid character */
if (!(flags & T2A_UNSPEC)) return FATAL; /* not allowed */
part[i++] = ATM_VPI_UNSPEC; /* all *_UNSPEC have the same
value */
}
if (!*++text) break;
if (*text++ != '.') return FATAL; /* dot required */
}
if (i < 2) return TRY_OTHER; /* no dots */
if (i == 2) {
part[2] = part[1];
part[1] = part[0];
part[0] = 0; /* default interface */
}
if (part[0] > SHRT_MAX || part[2] > ATM_MAX_VCI)
return TRY_OTHER; /* too big */
if (part[1] > (flags & T2A_NNI ? ATM_MAX_VPI_NNI : ATM_MAX_VPI))
return TRY_OTHER; /* too big */
if (part[0] == ATM_VPI_UNSPEC) return FATAL; /* bad */
addr->sap_family = AF_ATMPVC;
addr->sap_addr.itf = part[0];
addr->sap_addr.vpi = part[1];
addr->sap_addr.vci = part[2];
return 0;
}
static int do_try_nsap(const char *text,struct sockaddr_atmsvc *addr,int flags)
{
const char *walk;
int count,pos,dot;
int offset,len;
char value;
count = dot = 0;
for (walk = text; *walk; walk++)
if (isdigit(*walk)) {
if (count++ == 15) break;
dot = 1;
}
else if (*text != '.') break;
else if (!dot) return FATAL; /* two dots in a row */
else dot = 0;
if (*walk != ':') {
pos = 0;
offset = 0;
}
else {
if (!dot || *text == '0') return FATAL;
addr->sas_addr.prv[0] = ATM_AFI_E164;
addr->sas_addr.prv[1] = 0;
memset(addr->sas_addr.prv+1,0,8);
for (pos = 18-count-1; *text; text++) {
if (*text == '.') continue;
if (*text == ':') break;
else {
if (pos & 1) addr->sas_addr.prv[pos >> 1] |= *text-'0';
else addr->sas_addr.prv[pos >> 1] = (*text-'0') << 4;
pos++;
}
}
addr->sas_addr.prv[8] |= 0xf;
text++;
pos++;
offset = 72;
}
for (dot = 0; *text; text++)
if (isxdigit(*text)) {
if (pos == ATM_ESA_LEN*2) return TRY_OTHER; /* too long */
value = isdigit(*text) ? *text-'0' : (islower(*text) ?
toupper(*text) : *text)-'A'+10;
if (pos & 1) addr->sas_addr.prv[pos >> 1] |= value;
else addr->sas_addr.prv[pos >> 1] = value << 4;
pos++;
dot = 1;
}
else
if (*text == '/' && (flags & T2A_WILDCARD)) break;
else if (*text != '.') return TRY_OTHER;
else {
if (!dot) return FATAL; /* two dots in a row */
dot = 0;
}
if (!dot) return FATAL;
if (pos > 1 && !*addr->sas_addr.prv)
return TRY_OTHER; /* no leading zeroes */
if (!*text)
return pos != ATM_ESA_LEN*2 ? TRY_OTHER : ATM_ESA_LEN*2;
/* handle bad length */
len = 0;
while (*++text) {
if (!isdigit(*text)) return -1; /* non-digit in length */
if (len >= pos*4) return -1; /* too long */
len = len*10+*text-'0';
}
if (len > 7 && addr->sas_addr.prv[0] != ATM_AFI_E164) offset = 72;
if (len < offset) return FATAL;
return len > pos*4 ? TRY_OTHER : len;
}
static int try_nsap(const char *text,struct sockaddr_atmsvc *addr,int flags)
{
int result;
result = do_try_nsap(text,addr,flags);
if (result < 0) return result;
addr->sas_family = AF_ATMSVC;
*addr->sas_addr.pub = 0;
return result;
}
static int try_e164(const char *text,struct sockaddr_atmsvc *addr,int flags)
{
int i,dot,result;
if (*text == ':' || *text == '+') text++;
for (i = dot = 0; *text; text++)
if (isdigit(*text)) {
if (i == ATM_E164_LEN) return TRY_OTHER; /* too long */
addr->sas_addr.pub[i++] = *text;
dot = 1;
}
else if (*text != '.') break;
else {
if (!dot) return TRY_OTHER; /* two dots in a row */
dot = 0;
}
if (!dot) return TRY_OTHER;
addr->sas_addr.pub[i] = 0;
*addr->sas_addr.prv = 0;
result = 0;
if (*text) {
if (*text++ != '+') return TRY_OTHER;
else {
result = do_try_nsap(text,addr,flags);
if (result < 0) return FATAL;
}
}
addr->sas_family = AF_ATMSVC;
return result;
}
static int search(FILE *file,const char *text,struct sockaddr *addr,int length,
int flags)
{
char line[MAX_ATM_NAME_LEN+1];
const char *here;
int result;
while (fgets(line,MAX_ATM_NAME_LEN,file)) {
if (!strtok(line,"\t\n ")) continue;
while ((here = strtok(NULL,"\t\n ")))
if (!strcasecmp(here,text)) {
here = strtok(line,"\t\n ");
result = text2atm(here,addr,length,flags);
if (result >= 0) return result;
}
}
return TRY_OTHER;
}
static int try_name(const char *text,struct sockaddr *addr,int length,
int flags)
{
FILE *file;
int result;
if (!(file = fopen(HOSTS_ATM,"r"))) return TRY_OTHER;
result = search(file,text,addr,length,flags);
(void) fclose(file);
return result;
}
int text2atm(const char *text,struct sockaddr *addr,int length,int flags)
{
int result;
if (!*text) return -1;
if (!(flags & (T2A_PVC | T2A_SVC))) flags |= T2A_PVC | T2A_SVC;
if (length < sizeof(struct sockaddr_atmpvc)) return -1;
if (flags & T2A_PVC) {
result = try_pvc(text,(struct sockaddr_atmpvc *) addr,flags);
if (result != TRY_OTHER) return result;
}
if ((flags & T2A_SVC) && length >= sizeof(struct sockaddr_atmsvc)) {
result = try_nsap(text,(struct sockaddr_atmsvc *) addr,flags);
if (result != TRY_OTHER) return result;
result = try_e164(text,(struct sockaddr_atmsvc *) addr,flags);
if (result != TRY_OTHER) return result;
}
if (!(flags & T2A_NAME)) return -1;
result = try_name(text,addr,length,flags & ~T2A_NAME);
if (result == TRY_OTHER && !(flags & T2A_LOCAL))
result = ans_byname(text,(struct sockaddr_atmsvc *) addr,length,flags);
if (result != TRY_OTHER) return result;
return -1;
}
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