#include "internal.h"
/*
- * IPv4
+ * General address-family operations.
*/
#define SIN(sa) ((struct sockaddr_in *)(sa))
#define CSIN(sa) ((const struct sockaddr_in *)(sa))
-static const void *inet_sockaddr_to_inaddr(const struct sockaddr *sa)
- { return &CSIN(sa)->sin_addr; }
+#define SIN6(sa) ((struct sockaddr_in6 *)(sa))
+#define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))
+
+/* This gadget (thanks, Richard Kettlewell) makes sure that we handle the
+ * same set of address families in each switch. */
+#define AF_CASES(pre) \
+ case AF_INET: goto pre##_inet; \
+ case AF_INET6: goto pre##_inet6
+
+static void unknown_af(int af) {
+ fprintf(stderr, "ADNS INTERNAL: unknown address family %d\n", af);
+ abort();
+}
-static int inet_sockaddr_equalp(const struct sockaddr *sa,
- const struct sockaddr *sb)
+int adns__af_supported_p(int af)
{
- const struct sockaddr_in *sina = CSIN(sa), *sinb = CSIN(sb);
- return (sina->sin_addr.s_addr == sinb->sin_addr.s_addr &&
- sina->sin_port == sinb->sin_port);
+ switch (af) {
+ AF_CASES(af);
+ af_inet: af_inet6: return 1;
+ default: return 0;
+ }
}
-static void inet_prefix_mask(int len, union gen_addr *mask)
- { mask->v4.s_addr = htonl(!len ? 0 : 0xffffffff << (32 - len)); }
+int adns__sockaddr_equal_p(const struct sockaddr *sa,
+ const struct sockaddr *sb)
+{
+ if (sa->sa_family != sb->sa_family) return 0;
+ switch (sa->sa_family) {
+ AF_CASES(af);
+ af_inet: {
+ const struct sockaddr_in *sina = CSIN(sa), *sinb = CSIN(sb);
+ return (sina->sin_addr.s_addr == sinb->sin_addr.s_addr &&
+ sina->sin_port == sinb->sin_port);
+ }
+ af_inet6: {
+ /* Don't check the flowlabel. That's apparently useful for routing
+ * performance, but doesn't affect the address in any important
+ * respect.
+ */
+ const struct sockaddr_in6 *sin6a = CSIN6(sa), *sin6b = CSIN6(sb);
+ return (memcmp(sin6a->sin6_addr.s6_addr,
+ sin6b->sin6_addr.s6_addr,
+ sizeof(sin6a->sin6_addr.s6_addr)) == 0 &&
+ sin6a->sin6_port == sin6b->sin6_port &&
+ sin6a->sin6_scope_id == sin6b->sin6_scope_id);
+ }
+ default:
+ unknown_af(sa->sa_family);
+ return -1;
+ }
+}
-static int inet_guess_len(const union gen_addr *addr)
+int adns__gen_pton(const char *p, int *af_r, union gen_addr *addr_r)
{
- unsigned a = (ntohl(addr->v4.s_addr) >> 24) & 0xff;
+ static const int aflist[] = { AF_INET6, AF_INET };
+ int i, rc;
- if (a < 128) return 8;
- else if (a < 192) return 16;
- else if (a < 224) return 24;
- else return -1;
+ for (i = 0; i < sizeof(aflist)/sizeof(*aflist); i++) {
+ rc = inet_pton(aflist[i], p, addr_r);
+ assert(rc >= 0);
+ if (rc) { *af_r = aflist[i]; return 1; }
+ }
+ return 0;
}
-static int inet_matchp(const union gen_addr *addr,
- const union gen_addr *base,
- const union gen_addr *mask)
- { return (addr->v4.s_addr & mask->v4.s_addr) == base->v4.s_addr; }
-
-static int inet_rev_parsecomp(const char *p, size_t n)
+int adns__addr_width(int af)
{
- int i = 0;
- if (n > 3) return -1;
-
- while (n--) {
- if ('0' <= *p && *p <= '9') i = 10*i + *p++ - '0';
- else return -1;
+ switch (af) {
+ AF_CASES(af);
+ af_inet: return 32;
+ af_inet6: return 128;
+ default: unknown_af(af); return -1;
}
- return i;
}
-static void inet_rev_mkaddr(union gen_addr *addr, const byte *ipv)
+void adns__prefix_mask(int af, int len, union gen_addr *mask_r)
{
- addr->v4.s_addr = htonl((ipv[3]<<24) | (ipv[2]<<16) |
- (ipv[1]<<8) | (ipv[0]));
+ switch (af) {
+ AF_CASES(af);
+ af_inet:
+ assert(len <= 32);
+ mask_r->v4.s_addr = htonl(!len ? 0 : 0xffffffff << (32 - len));
+ break;
+ af_inet6: {
+ int i = len/8, j = len%8;
+ unsigned char *m = mask_r->v6.s6_addr;
+
+ assert(len <= 128);
+ memset(m, 0xff, i);
+ if (j) m[i++] = (0xff << (8-j)) & 0xff;
+ memset(m+i, 0, 16-i);
+ } break;
+ default:
+ unknown_af(af);
+ break;
+ }
}
-static char *inet_rev_mkname(const struct sockaddr *sa, char *buf)
+int adns__guess_prefix_length(int af, const union gen_addr *addr)
{
- unsigned long a = ntohl(CSIN(sa)->sin_addr.s_addr);
- int i;
+ switch (af) {
+ AF_CASES(af);
+ af_inet: {
+ unsigned a = (ntohl(addr->v4.s_addr) >> 24) & 0xff;
+
+ if (a < 128) return 8;
+ else if (a < 192) return 16;
+ else if (a < 224) return 24;
+ else return -1;
+ } break;
+ af_inet6:
+ return 64;
+ default:
+ unknown_af(af);
+ return -1;
+ }
+}
- for (i = 0; i < 4; i++) {
- if (i) *buf++ = '.';
- buf += sprintf(buf, "%d", (int)(a & 0xff));
- a >>= 8;
+int adns__addr_match_p(int addraf, const union gen_addr *addr,
+ int netaf, const union gen_addr *base,
+ const union gen_addr *mask)
+{
+ if (addraf != netaf) return 0;
+ switch (addraf) {
+ AF_CASES(af);
+ af_inet:
+ return (addr->v4.s_addr & mask->v4.s_addr) == base->v4.s_addr;
+ af_inet6: {
+ int i;
+ const char *a = addr->v6.s6_addr;
+ const char *b = base->v6.s6_addr;
+ const char *m = mask->v6.s6_addr;
+
+ for (i = 0; i < 16; i++)
+ if ((a[i] & m[i]) != b[i]) return 0;
+ return 1;
+ } break;
+ default:
+ unknown_af(addraf);
+ return -1;
}
- return buf;
}
-const afinfo adns__inet_afinfo = {
- AF_INET, 32, '.', 4, 3, adns_r_a,
- inet_sockaddr_to_inaddr, inet_sockaddr_equalp,
- inet_prefix_mask, inet_guess_len, inet_matchp,
- inet_rev_parsecomp, inet_rev_mkaddr, inet_rev_mkname
-};
+const void *adns__sockaddr_to_inaddr(const struct sockaddr *sa)
+{
+ switch (sa->sa_family) {
+ AF_CASES(af);
+ af_inet: return &CSIN(sa)->sin_addr;
+ af_inet6: return &CSIN6(sa)->sin6_addr;
+ default: unknown_af(sa->sa_family); return 0;
+ }
+}
/*
- * IPv6
+ * Reverse-domain parsing and construction.
*/
-#define SIN6(sa) ((struct sockaddr_in6 *)(sa))
-#define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))
+int adns__make_reverse_domain(const struct sockaddr *sa,
+ const char *zone,
+ char **buf_io, size_t bufsz,
+ char **buf_free_r)
+{
+ size_t req;
+ char *p;
+ unsigned c, y;
+ unsigned long aa;
+ const unsigned char *ap;
+ int i, j;
-static const void *inet6_sockaddr_to_inaddr(const struct sockaddr *sa)
- { return &CSIN6(sa)->sin6_addr; }
+ switch (sa->sa_family) {
+ AF_CASES(af);
+ af_inet:
+ req = 4 * 4;
+ if (!zone) zone = "in-addr.arpa";
+ break;
+ af_inet6:
+ req = 2 * 32;
+ if (!zone) zone = "ip6.arpa";
+ break;
+ default:
+ return ENOSYS;
+ }
-static int inet6_sockaddr_equalp(const struct sockaddr *sa,
- const struct sockaddr *sb)
-{
- const struct sockaddr_in6 *sin6a = CSIN6(sa), *sin6b = CSIN6(sb);
- return (memcmp(sin6a->sin6_addr.s6_addr,
- sin6b->sin6_addr.s6_addr,
- sizeof(sin6a->sin6_addr.s6_addr)) == 0 &&
- sin6a->sin6_port == sin6b->sin6_port &&
- sin6a->sin6_scope_id == sin6b->sin6_scope_id);
-}
+ req += strlen(zone) + 1;
+ if (req <= bufsz)
+ p = *buf_io;
+ else {
+ p = malloc(req); if (!p) return errno;
+ *buf_free_r = p;
+ }
-static void inet6_prefix_mask(int len, union gen_addr *mask)
-{
- int i = len/8, j = len%8;
- unsigned char *m = mask->v6.s6_addr;
+ *buf_io = p;
+ switch (sa->sa_family) {
+ AF_CASES(bf);
+ bf_inet:
+ aa = ntohl(CSIN(sa)->sin_addr.s_addr);
+ for (i = 0; i < 4; i++) {
+ p += sprintf(p, "%d", (int)(aa & 0xff));
+ *p++ = '.';
+ aa >>= 8;
+ }
+ break;
+ bf_inet6:
+ ap = CSIN6(sa)->sin6_addr.s6_addr + 16;
+ for (i = 0; i < 16; i++) {
+ c = *--ap;
+ for (j = 0; j < 2; j++) {
+ y = c & 0xf;
+ if (y < 10) *p++ = y + '0';
+ else *p++ = y - 10 + 'a';
+ c >>= 4;
+ *p++ = '.';
+ }
+ }
+ break;
+ default:
+ unknown_af(sa->sa_family);
+ }
- assert(len < 128);
- memset(m, 0xff, i);
- if (j) m[i++] = (0xff << (8-j)) & 0xff;
- memset(m + i, 0, 16-i);
+ strcpy(p, zone);
+ return 0;
}
-static int inet6_guess_len(const union gen_addr *addr)
- { return 64; }
-static int inet6_matchp(const union gen_addr *addr,
- const union gen_addr *base,
- const union gen_addr *mask)
+static int inet_rev_parsecomp(const char *p, size_t n)
{
- int i;
- const char *a = addr->v6.s6_addr;
- const char *b = base->v6.s6_addr;
- const char *m = mask->v6.s6_addr;
+ int i = 0;
+ if (n > 3) return -1;
- for (i = 0; i < 16; i++)
- if ((a[i] & m[i]) != b[i]) return 0;
- return 1;
+ while (n--) {
+ if ('0' <= *p && *p <= '9') i = 10*i + *p++ - '0';
+ else return -1;
+ }
+ return i;
+}
+
+static void inet_rev_mkaddr(union gen_addr *addr, const byte *ipv)
+{
+ addr->v4.s_addr = htonl((ipv[3]<<24) | (ipv[2]<<16) |
+ (ipv[1]<<8) | (ipv[0]));
}
static int inet6_rev_parsecomp(const char *p, size_t n)
a[i] = (ipv[31-2*i] << 4) | (ipv[30-2*i] << 0);
}
-static char *inet6_rev_mkname(const struct sockaddr *sa, char *buf)
-{
- const unsigned char *a = CSIN6(sa)->sin6_addr.s6_addr + 16;
- unsigned c, y;
- int i, j;
+static const struct revparse_domain {
+ int af; /* address family */
+ int nrevlab; /* n of reverse-address labels */
+ adns_rrtype rrtype; /* forward-lookup type */
+
+ int (*rev_parsecomp)(const char *p, size_t n);
+ /* parse a single component from a label; return the integer value, or -1
+ * if it was unintelligible.
+ */
+
+ void (*rev_mkaddr)(union gen_addr *addr, const byte *ipv);
+ /* write out the parsed address from a vector of parsed components */
+
+ const char *const tail[3]; /* tail label names */
+} revparse_domains[NREVDOMAINS] = {
+ { AF_INET, 4, adns_r_a, inet_rev_parsecomp, inet_rev_mkaddr,
+ { DNS_INADDR_ARPA, 0 } },
+ { AF_INET6, 32, adns_r_aaaa, inet6_rev_parsecomp, inet6_rev_mkaddr,
+ { DNS_IP6_ARPA, 0 } },
+};
- for (i = 0; i < 16; i++) {
- c = *--a;
- for (j = 0; j < 2; j++) {
- if (i || j) *buf++ = '.';
- y = c & 0xf;
- if (y < 10) *buf++ = y + '0';
- else *buf++ = y - 10 + 'a';
- c >>= 4;
+#define REVDOMAIN_MAP(rps, labnum) \
+ ((labnum) ? (rps)->map : (1 << NREVDOMAINS) - 1)
+
+int adns__revparse_label(struct revparse_state *rps, int labnum,
+ const char *label, int lablen)
+{
+ unsigned f = REVDOMAIN_MAP(rps, labnum);
+ const struct revparse_domain *rpd;
+ const char *tp;
+ unsigned d;
+ int i, ac;
+
+ for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
+ if (!(f & d)) continue;
+ if (labnum >= rpd->nrevlab) {
+ tp = rpd->tail[labnum - rpd->nrevlab];
+ if (!tp || strncmp(label, tp, lablen) != 0 || tp[lablen])
+ goto mismatch;
+ } else {
+ ac = rpd->rev_parsecomp(label, lablen);
+ if (ac < 0) goto mismatch;
+ assert(labnum < sizeof(rps->ipv[i]));
+ rps->ipv[i][labnum] = ac;
}
+ continue;
+
+ mismatch:
+ f &= ~d;
+ if (!f) return -1;
}
- return buf;
+
+ rps->map = f;
+ return 0;
}
-const afinfo adns__inet6_afinfo = {
- AF_INET6, 128, ':', 32, 1, adns_r_aaaa,
- inet6_sockaddr_to_inaddr, inet6_sockaddr_equalp,
- inet6_prefix_mask, inet6_guess_len, inet6_matchp,
- inet6_rev_parsecomp, inet6_rev_mkaddr, inet6_rev_mkname
-};
+int adns__revparse_done(struct revparse_state *rps, int nlabels,
+ adns_rrtype *rrtype_r, struct af_addr *addr_r)
+{
+ unsigned f = REVDOMAIN_MAP(rps, nlabels);
+ const struct revparse_domain *rpd;
+ unsigned d;
+ int i, found = -1;
+
+ for (rpd=revparse_domains, i=0, d=1; i<NREVDOMAINS; rpd++, i++, d <<= 1) {
+ if (!(f & d)) continue;
+ if (nlabels >= rpd->nrevlab && !rpd->tail[nlabels - rpd->nrevlab])
+ { found = i; continue; }
+ f &= ~d;
+ if (!f) return -1;
+ }
+ assert(found >= 0); assert(f == (1 << found));
+
+ rpd = &revparse_domains[found];
+ *rrtype_r = rpd->rrtype;
+ addr_r->af = rpd->af;
+ rpd->rev_mkaddr(&addr_r->addr, rps->ipv[found]);
+ return 0;
+}
~ianmdlvl / adns.git / blobdiff