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78 lines
1.5 KiB
78 lines
1.5 KiB
#include <sys/socket.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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static int hexval(unsigned c)
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{
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if (c-'0'<10) return c-'0';
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c |= 32;
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if (c-'a'<6) return c-'a'+10;
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return -1;
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}
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int inet_pton(int af, const char *restrict s, void *restrict a0)
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{
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uint16_t ip[8];
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unsigned char *a = a0;
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const char *z;
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unsigned long x;
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int i, j, v, d, brk=-1, need_v4=0;
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/* Reimplement this because inet_pton cannot accept special v4 forms */
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if (af==AF_INET) {
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for (i=0; i<4 && *s; i++) {
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a[i] = x = strtoul(s, (char **)&z, 10);
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if (!isdigit(*s) || z==s || (*z && *z != '.') || x>255)
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return 0;
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s=z+1;
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}
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return 1;
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} else if (af!=AF_INET6) {
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errno = EAFNOSUPPORT;
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return -1;
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}
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if (s[0]==':' && s[1]==':') s++;
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for (i=0; ; i++, s+=j+1) {
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if (s[0]==':' && brk<0) {
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brk=i;
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j=0;
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ip[i]=0;
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if (!s[1]) break;
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continue;
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}
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if (hexval(s[0])<0) return 0;
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while (s[0]=='0' && s[1]=='0') s++;
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for (v=j=0; j<5 && (d=hexval(s[j]))>=0; j++)
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v=16*v+d;
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if (v > 65535) return 0;
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ip[i] = v;
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if (!s[j]) {
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if (brk<0 && i!=7) return 0;
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break;
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}
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if (i<7) {
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if (s[j]==':') continue;
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if (s[j]!='.') return 0;
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need_v4=1;
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i++;
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break;
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}
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return 0;
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}
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if (brk>=0) {
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memmove(ip+brk+7-i, ip+brk, 2*(i+1-brk));
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for (j=0; j<7-i; j++) ip[brk+j] = 0;
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}
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for (j=0; j<8; j++) {
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*a++ = ip[j]>>8;
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*a++ = ip[j];
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}
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if (need_v4 && inet_pton(AF_INET, (void *)s, a-4) <= 0) return 0;
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return 1;
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}
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