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author | Henryk Plötz <henryk@ploetzli.ch> | 2014-10-03 20:04:14 +0200 |
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committer | Henryk Plötz <henryk@ploetzli.ch> | 2014-10-03 20:04:14 +0200 |
commit | c44d8b51ffb5a413f8bbdbd9991bbc573853e397 (patch) | |
tree | e7f2e644de620879f610c909c405cbc4e44d6062 /ip6_scan.c | |
parent | 0e5b2871ca6456b01d4bf037a6e68badf1ff1a41 (diff) | |
download | tinydnssec-c44d8b51ffb5a413f8bbdbd9991bbc573853e397.tar.gz tinydnssec-c44d8b51ffb5a413f8bbdbd9991bbc573853e397.tar.bz2 |
Apply patch djbdns-1.05-test27.diff.bz2
Source was http://www.fefe.de/dns/djbdns-1.05-test27.diff.bz2, SHA1 f0380ec1866f49c0bcf6369a923ac0a4a5095da8
Diffstat (limited to 'ip6_scan.c')
-rw-r--r-- | ip6_scan.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/ip6_scan.c b/ip6_scan.c new file mode 100644 index 0000000..f355d46 --- /dev/null +++ b/ip6_scan.c @@ -0,0 +1,115 @@ +#include "scan.h" +#include "ip4.h" +#include "ip6.h" +#include "byte.h" + +/* + * IPv6 addresses are really ugly to parse. + * Syntax: (h = hex digit) + * 1. hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh + * 2. any number of 0000 may be abbreviated as "::", but only once + * 3. The last two words may be written as IPv4 address + */ + +unsigned int ip6_scan(const char *s,char ip[16]) +{ + unsigned int i; + unsigned int len=0; + unsigned long u; + + char suffix[16]; + int prefixlen=0; + int suffixlen=0; + + if ((i=ip4_scan(s,ip+12))) { + const char *c=V4mappedprefix; + if (byte_equal(ip+12,4,V6any)) c=V6any; + for (len=0; len<12; ++len) ip[len]=c[len]; + return i; + } + for (i=0; i<16; i++) ip[i]=0; + for (;;) { + if (*s == ':') { + len++; + if (s[1] == ':') { /* Found "::", skip to part 2 */ + s+=2; + len++; + break; + } + s++; + } + i = scan_xlong(s,&u); + if (!i) return 0; + if (prefixlen==12 && s[i]=='.') { + /* the last 4 bytes may be written as IPv4 address */ + i=ip4_scan(s,ip+12); + if (i) + return i+len; + else + return 0; + } + ip[prefixlen++] = (u >> 8); + ip[prefixlen++] = (u & 255); + s += i; len += i; + if (prefixlen==16) + return len; + } + +/* part 2, after "::" */ + for (;;) { + if (*s == ':') { + if (suffixlen==0) + break; + s++; + len++; + } else if (suffixlen!=0) + break; + i = scan_xlong(s,&u); + if (!i) { + len--; + break; + } + if (suffixlen+prefixlen<=12 && s[i]=='.') { + int j=ip4_scan(s,suffix+suffixlen); + if (j) { + suffixlen+=4; + len+=j; + break; + } else + prefixlen=12-suffixlen; /* make end-of-loop test true */ + } + suffix[suffixlen++] = (u >> 8); + suffix[suffixlen++] = (u & 255); + s += i; len += i; + if (prefixlen+suffixlen==16) + break; + } + for (i=0; i<suffixlen; i++) + ip[16-suffixlen+i] = suffix[i]; + return len; +} + +static long int fromhex(unsigned char c) { + if (c>='0' && c<='9') + return c-'0'; + else if (c>='A' && c<='F') + return c-'A'+10; + else if (c>='a' && c<='f') + return c-'a'+10; + return -1; +} + +unsigned int ip6_scan_flat(const char *s,char ip[16]) +{ + int i; + for (i=0; i<16; i++) { + int tmp; + tmp=fromhex(*s++); + if (tmp<0) return 0; + ip[i]=tmp << 4; + tmp=fromhex(*s++); + if (tmp<0) return 0; + ip[i]+=tmp; + } + return 32; +} |