diff options
author | John Denker <jsd@av8n.com> | 2012-07-31 22:34:58 -0700 |
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committer | John Denker <jsd@av8n.com> | 2012-07-31 22:36:28 -0700 |
commit | ef6722750b4518fcb29bf983755b5f02451ef224 (patch) | |
tree | 966e94ffd01cd8abb59e16a6992e142db345aa9f /ucspi-tcp-0.88/scan_ip6.c | |
parent | b95f5ec1d83519c603f6e2145865c14932c4a813 (diff) |
a bunch of files added by the ipv6 patch
Diffstat (limited to 'ucspi-tcp-0.88/scan_ip6.c')
-rw-r--r-- | ucspi-tcp-0.88/scan_ip6.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/ucspi-tcp-0.88/scan_ip6.c b/ucspi-tcp-0.88/scan_ip6.c new file mode 100644 index 0000000..ee239fd --- /dev/null +++ b/ucspi-tcp-0.88/scan_ip6.c @@ -0,0 +1,87 @@ +#include "scan.h" +#include "ip4.h" +#include "ip6.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 scan_ip6(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((char*)s,ip+12))) { + for (len=0; len<12; ++len) ip[len]=V4mappedprefix[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((char*)s,&u); + if (!i) return 0; + if (prefixlen==12 && s[i]=='.') { + /* the last 4 bytes may be written as IPv4 address */ + i=ip4_scan((char*)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((char*)s,&u); + if (!i) { + len--; + break; + } + if (suffixlen+prefixlen<=12 && s[i]=='.') { + int j=ip4_scan((char*)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; +} |