diff options
Diffstat (limited to 'src/network/getnameinfo.c')
| -rw-r--r-- | src/network/getnameinfo.c | 58 |
1 files changed, 53 insertions, 5 deletions
diff --git a/src/network/getnameinfo.c b/src/network/getnameinfo.c index 6962ed1a..708ec5e0 100644 --- a/src/network/getnameinfo.c +++ b/src/network/getnameinfo.c @@ -6,6 +6,9 @@ #include <netinet/in.h> #include <arpa/inet.h> #include <net/if.h> +#include <ctype.h> +#include "lookup.h" +#include "stdio_impl.h" int __dns_parse(const unsigned char *, int, int (*)(void *, int, const void *, int, const void *), void *); int __dn_expand(const unsigned char *, const unsigned char *, const unsigned char *, char *, int); @@ -42,6 +45,47 @@ static void mkptr6(char *s, const unsigned char *ip) strcpy(s, "ip6.arpa"); } +static char *reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, int family) +{ + char line[512], *p, *z; + unsigned char _buf[1032], atmp[16]; + struct address iplit; + FILE _f, *f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf); + if (!f) return 0; + if (family == AF_INET) { + memcpy(atmp+12, a, 4); + memcpy(atmp, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12); + a = atmp; + } + while (fgets(line, sizeof line, f)) { + if ((p=strchr(line, '#'))) *p++='\n', *p=0; + + for (p=line; *p && !isspace(*p); p++); + *p++ = 0; + if (__lookup_ipliteral(&iplit, line, AF_UNSPEC)<=0) + continue; + + if (iplit.family == AF_INET) { + memcpy(iplit.addr+12, iplit.addr, 4); + memcpy(iplit.addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12); + iplit.scopeid = 0; + } + + if (memcmp(a, iplit.addr, 16) || iplit.scopeid != scopeid) + continue; + + for (; *p && isspace(*p); p++); + for (z=p; *z && !isspace(*z); z++); + *z = 0; + if (z-p < 256) { + memcpy(buf, p, z-p+1); + break; + } + } + __fclose_ca(f); + return 0; +} + static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet) { char tmp[256]; @@ -62,13 +106,14 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl, char buf[256], num[3*sizeof(int)+1]; int af = sa->sa_family; unsigned char *a; - unsigned x; + unsigned scopeid; switch (af) { case AF_INET: a = (void *)&((struct sockaddr_in *)sa)->sin_addr; if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY; mkptr4(ptr, a); + scopeid = 0; break; case AF_INET6: a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr; @@ -77,6 +122,7 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl, mkptr6(ptr, a); else mkptr4(ptr, a+12); + scopeid = ((struct sockaddr_in6 *)sa)->sin6_scope_id; break; default: return EAI_FAMILY; @@ -85,6 +131,9 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl, if (node && nodelen) { buf[0] = 0; if (!(flags & NI_NUMERICHOST)) { + reverse_hosts(buf, a, scopeid, af); + } + if (!*buf && !(flags & NI_NUMERICHOST)) { unsigned char query[18+PTR_MAX], reply[512]; int qlen = __res_mkquery(0, ptr, 1, RR_PTR, 0, 0, 0, query, sizeof query); @@ -96,15 +145,14 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl, if (!*buf) { if (flags & NI_NAMEREQD) return EAI_NONAME; inet_ntop(af, a, buf, sizeof buf); - if (af == AF_INET6 && - (x = ((struct sockaddr_in6 *)sa)->sin6_scope_id)) { + if (scopeid) { char *p = 0, tmp[IF_NAMESIZE+1]; if (!(flags & NI_NUMERICSCOPE) && (IN6_IS_ADDR_LINKLOCAL(a) || IN6_IS_ADDR_MC_LINKLOCAL(a))) - p = if_indextoname(x, tmp+1); + p = if_indextoname(scopeid, tmp+1); if (!p) - p = itoa(num, x); + p = itoa(num, scopeid); *--p = '%'; strcat(buf, p); } |