#include <errno.h>
#include <limits.h>
#include <unistd.h>
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdbool.h>
#include <sys/types.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <net/if.h>
#include "internal.h"
/*
- * IPv4
+ * General address-family operations.
*/
#define SIN(sa) ((struct sockaddr_in *)(sa))
#define CSIN(sa) ((const struct sockaddr_in *)(sa))
-static void *inet_sockaddr_to_inaddr(struct sockaddr *sa)
- { return &SIN(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 int inet_sockaddr_equalp(const struct sockaddr *sa,
- const struct sockaddr *sb)
+static void unknown_af(int af) {
+ fprintf(stderr, "ADNS INTERNAL: unknown address family %d\n", af);
+ abort();
+}
+
+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
+ * addr2text and text2addr
*/
-#define SIN6(sa) ((struct sockaddr_in6 *)(sa))
-#define CSIN6(sa) ((const struct sockaddr_in6 *)(sa))
+#define ADDRFAM_DEBUG
+#ifdef ADDRFAM_DEBUG
+static void af_debug_func(const char *fmt, ...) {
+ int esave= errno;
+ va_list al;
+ va_start(al,fmt);
+ vfprintf(stderr,fmt,al);
+ va_end(al);
+ errno= esave;
+}
+# define af_debug(fmt,...) \
+ (af_debug_func("%s: " fmt "\n", __func__, __VA_ARGS__))
+#else
+# define af_debug(fmt,...) ((void)("" fmt "", __VA_ARGS__))
+#endif
+
+static bool addrtext_our_errno(int e) {
+ return
+ e==EAFNOSUPPORT ||
+ e==EINVAL ||
+ e==ENOSPC ||
+ e==ENOSYS;
+}
-static void *inet6_sockaddr_to_inaddr(struct sockaddr *sa)
- { return &SIN6(sa)->sin6_addr; }
+static bool addrtext_scope_use_ifname(const struct sockaddr *sa) {
+ const struct in6_addr *in6= &CSIN6(sa)->sin6_addr;
+ return
+ IN6_IS_ADDR_LINKLOCAL(in6) ||
+ IN6_IS_ADDR_MC_LINKLOCAL(in6);
+}
-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);
+int adns_text2addr(const char *text, uint16_t port, adns_queryflags flags,
+ struct sockaddr *sa, socklen_t *salen_io) {
+ int af;
+ char copybuf[INET6_ADDRSTRLEN];
+ const char *parse=text;
+ const char *scopestr=0;
+ socklen_t needlen;
+ void *dst;
+ uint16_t *portp;
+
+#define INVAL(how) do{ \
+ af_debug("invalid: %s: `%s'", how, text); \
+ return EINVAL; \
+}while(0)
+
+#define AFCORE(INETx,SINx,sinx) \
+ af= AF_##INETx; \
+ dst = &SINx(sa)->sinx##_addr; \
+ portp = &SINx(sa)->sinx##_port; \
+ needlen= sizeof(*SINx(sa));
+
+ if (!strchr(text, ':')) { /* INET */
+
+ AFCORE(INET,SIN,sin);
+
+ } else { /* INET6 */
+
+ AFCORE(INET6,SIN6,sin6);
+
+ const char *percent= strchr(text, '%');
+ if (percent) {
+ ptrdiff_t lhslen = percent - text;
+ if (lhslen >= INET6_ADDRSTRLEN) INVAL("scoped addr lhs too long");
+ memcpy(copybuf, text, lhslen);
+ copybuf[lhslen]= 0;
+
+ parse= copybuf;
+ scopestr= percent+1;
+
+ af_debug("will parse scoped addr `%s' %% `%s'", parse, scopestr);
+ }
+
+ }
+
+#undef AFCORE
+
+ if (scopestr && (flags & adns_qf_addrlit_scope_forbid))
+ INVAL("scoped addr but _scope_forbid");
+
+ if (*salen_io < needlen) {
+ *salen_io = needlen;
+ return ENOSPC;
+ }
+
+ memset(sa, 0, needlen);
+
+ sa->sa_family= af;
+ *portp = htons(port);
+
+ if (af == AF_INET && !(flags & adns_qf_addrlit_ipv4_quadonly)) {
+ /* we have to use inet_aton to deal with non-dotted-quad literals */
+ int r= inet_aton(parse,&SIN(sa)->sin_addr);
+ if (!r) INVAL("inet_aton rejected");
+ } else {
+ int r= inet_pton(af,parse,dst);
+ if (!r) INVAL("inet_pton rejected");
+ assert(r>0);
+ }
+
+ if (scopestr) {
+ errno=0;
+ char *ep;
+ unsigned long scope= strtoul(scopestr,&ep,10);
+ if (errno==ERANGE) INVAL("numeric scope id too large for unsigned long");
+ assert(!errno);
+ if (!*ep) {
+ if (scope > ~(uint32_t)0)
+ INVAL("numeric scope id too large for uint32_t");
+ } else { /* !!*ep */
+ if (flags & adns_qf_addrlit_scope_numeric)
+ INVAL("non-numeric scope but _scope_numeric");
+ if (!addrtext_scope_use_ifname(sa)) {
+ af_debug("cannot convert non-numeric scope"
+ " in non-link-local addr `%s'", text);
+ return ENOSYS;
+ }
+ errno= 0;
+ scope= if_nametoindex(scopestr);
+ if (!scope) {
+ /* RFC3493 says "No errors are defined". It's not clear
+ * whether that is supposed to mean if_nametoindex "can't
+ * fail" (other than by the supplied name not being that of an
+ * interface) which seems unrealistic, or that it conflates
+ * all its errors together by failing to set errno, or simply
+ * that they didn't bother to document the errors.
+ *
+ * glibc, FreeBSD and OpenBSD all set errno (to ENXIO when
+ * appropriate). See Debian bug #749349.
+ *
+ * We attempt to deal with this by clearing errno to start
+ * with, and then perhaps mapping the results. */
+ af_debug("if_nametoindex rejected scope name (errno=%s)",
+ strerror(errno));
+ if (errno==0) {
+ return ENXIO;
+ } else if (addrtext_our_errno(errno)) {
+ /* we use these for other purposes, urgh. */
+ perror("adns: adns_text2addr: if_nametoindex"
+ " failed with unexpected error");
+ return EIO;
+ } else {
+ return errno;
+ }
+ } else { /* ix>0 */
+ if (scope > ~(uint32_t)0) {
+ fprintf(stderr,"adns: adns_text2addr: if_nametoindex"
+ " returned an interface index >=2^32 which will not fit"
+ " in sockaddr_in6.sin6_scope_id");
+ return EIO;
+ }
+ }
+ } /* else; !!*ep */
+
+ SIN6(sa)->sin6_scope_id= scope;
+ } /* if (scopestr) */
+
+ *salen_io = needlen;
+ return 0;
}
-static void inet6_prefix_mask(int len, union gen_addr *mask)
+int adns_addr2text(const struct sockaddr *sa, adns_queryflags flags,
+ char *buffer, int *buflen_io, int *port_r) {
+ const void *src;
+ int port;
+
+ if (*buflen_io < ADNS_ADDR2TEXT_BUFLEN) {
+ *buflen_io = ADNS_ADDR2TEXT_BUFLEN;
+ return ENOSPC;
+ }
+
+ switch (sa->sa_family) {
+ AF_CASES(af);
+ af_inet: src= &CSIN(sa)->sin_addr; port= CSIN(sa)->sin_port; break;
+ af_inet6: src= &CSIN6(sa)->sin6_addr; port= CSIN6(sa)->sin6_port; break;
+ default: return EAFNOSUPPORT;
+ }
+
+ const char *ok= inet_ntop(sa->sa_family, src, buffer, *buflen_io);
+ assert(ok);
+
+ if (sa->sa_family == AF_INET6) {
+ uint32_t scope = CSIN6(sa)->sin6_scope_id;
+ if (scope) {
+ if (flags & adns_qf_addrlit_scope_forbid)
+ return EINVAL;
+ int scopeoffset = strlen(buffer);
+ int remain = *buflen_io - scopeoffset;
+ char *scopeptr = buffer + scopeoffset;
+ assert(remain >= IF_NAMESIZE+1/*%*/);
+ *scopeptr++= '%'; remain--;
+ bool parsedname = 0;
+ af_debug("will print scoped addr %s %% %"PRIu32"", buffer, scope);
+ if (scope <= UINT_MAX /* so we can pass it to if_indextoname */
+ && !(flags & adns_qf_addrlit_scope_numeric)
+ && addrtext_scope_use_ifname(sa)) {
+ parsedname = if_indextoname(scope, scopeptr);
+ if (!parsedname) {
+ af_debug("if_indextoname rejected scope (errno=%s)",
+ strerror(errno));
+ if (errno==ENXIO) {
+ /* fair enough, show it as a number then */
+ } else if (addrtext_our_errno(errno)) {
+ /* we use these for other purposes, urgh. */
+ perror("adns: adns_addr2text: if_indextoname"
+ " failed with unexpected error");
+ return EIO;
+ } else {
+ return errno;
+ }
+ }
+ }
+ if (!parsedname) {
+ int r = snprintf(scopeptr, remain,
+ "%"PRIu32"", scope);
+ assert(r < *buflen_io - scopeoffset);
+ }
+ af_debug("printed scoped addr `%s'", buffer);
+ }
+ }
+
+ if (port_r) *port_r= ntohs(port);
+ return 0;
+}
+
+/*
+ * Reverse-domain parsing and construction.
+ */
+
+int adns__make_reverse_domain(const struct sockaddr *sa,
+ const char *zone,
+ char **buf_io, size_t bufsz,
+ char **buf_free_r)
{
- int i = len/8, j = len%8;
- unsigned char *m = mask->v6.s6_addr;
+ size_t req;
+ char *p;
+ unsigned c, y;
+ unsigned long aa;
+ const unsigned char *ap;
+ int i, j;
- assert(len < 128);
- memset(m, 0xff, i);
- if (j) m[i++] = (0xff << (8-j)) & 0xff;
- memset(m + i, 0, 16-i);
+ 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;
+ }
+
+ req += strlen(zone) + 1;
+ if (req <= bufsz)
+ p = *buf_io;
+ else {
+ p = malloc(req); if (!p) return errno;
+ *buf_free_r = p;
+ }
+
+ *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);
+ }
+
+ 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 } },
+};
+
+#define REVDOMAIN_MAP(rps, labnum) \
+ ((labnum) ? (rps)->map : (1 << NREVDOMAINS) - 1)
- 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;
+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;
+}
~mdw / adns / blobdiff