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openwrt-xburst/package/mtr/patches/501-dns.patch
nico ebf4558cba add mtr (thanks to Thomas Reifferscheid) 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2050 3c298f89-4303-0410-b956-a3cf2f4a3e73
2005-10-04 22:15:32 +00:00

512 lines
18 KiB
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diff -Naur mtr-0.69.old/dns.c mtr-0.69.new/dns.c
--- mtr-0.69.old/dns.c 2005-01-11 09:32:42.000000000 +0100
+++ mtr-0.69.new/dns.c 2005-10-03 21:31:27.000000000 +0200
@@ -853,6 +853,507 @@
fputs("\r",stderr);
}
+#ifdef __UCLIBC__
+
+static const char digits[] = "0123456789";
+#define __set_errno(e) (errno = (e))
+
+#define NS_PUT16(s, cp) do { \
+ register u_int16_t t_s = (u_int16_t)(s); \
+ register u_char *t_cp = (u_char *)(cp); \
+ *t_cp++ = t_s >> 8; \
+ *t_cp = t_s; \
+ (cp) += NS_INT16SZ; \
+} while (0)
+
+
+
+#define NS_PUT32(l, cp) do { \
+ register u_int32_t t_l = (u_int32_t)(l); \
+ register u_char *t_cp = (u_char *)(cp); \
+ *t_cp++ = t_l >> 24; \
+ *t_cp++ = t_l >> 16; \
+ *t_cp++ = t_l >> 8; \
+ *t_cp = t_l; \
+ (cp) += NS_INT32SZ; \
+} while (0)
+
+
+void
+ns_put16(u_int src, u_char *dst) {
+ NS_PUT16(src, dst);
+}
+
+void
+ns_put32(u_long src, u_char *dst) {
+ NS_PUT32(src, dst);
+}
+
+void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
+void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
+
+int
+mklower(int ch) {
+ if (ch >= 0x41 && ch <= 0x5A)
+ return (ch + 0x20);
+ return (ch);
+}
+
+
+static int
+dn_find(const u_char *domain, const u_char *msg,
+ const u_char * const *dnptrs,
+ const u_char * const *lastdnptr)
+{
+ const u_char *dn, *cp, *sp;
+ const u_char * const *cpp;
+ u_int n;
+
+ for (cpp = dnptrs; cpp < lastdnptr; cpp++) {
+ sp = *cpp;
+ /*
+ * terminate search on:
+ * root label
+ * compression pointer
+ * unusable offset
+ */
+ while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 &&
+ (sp - msg) < 0x4000) {
+ dn = domain;
+ cp = sp;
+ while ((n = *cp++) != 0) {
+ /*
+ * check for indirection
+ */
+ switch (n & NS_CMPRSFLGS) {
+ case 0: /* normal case, n == len */
+ if (n != *dn++)
+ goto next;
+ for ((void)NULL; n > 0; n--)
+ if (mklower(*dn++) !=
+ mklower(*cp++))
+ goto next;
+ /* Is next root for both ? */
+ if (*dn == '\0' && *cp == '\0')
+ return (sp - msg);
+ if (*dn)
+ continue;
+ goto next;
+
+ case NS_CMPRSFLGS: /* indirection */
+ cp = msg + (((n & 0x3f) << 8) | *cp);
+ break;
+
+ default: /* illegal type */
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ }
+ next:
+ sp += *sp + 1;
+ }
+ }
+ __set_errno (ENOENT);
+ return (-1);
+}
+
+
+int
+ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
+ const u_char **dnptrs, const u_char **lastdnptr)
+{
+ u_char *dstp;
+ const u_char **cpp, **lpp, *eob, *msg;
+ const u_char *srcp;
+ int n, l, first = 1;
+
+ srcp = src;
+ dstp = dst;
+ eob = dstp + dstsiz;
+ lpp = cpp = NULL;
+ if (dnptrs != NULL) {
+ if ((msg = *dnptrs++) != NULL) {
+ for (cpp = dnptrs; *cpp != NULL; cpp++)
+ (void)NULL;
+ lpp = cpp; /* end of list to search */
+ }
+ } else
+ msg = NULL;
+
+ /* make sure the domain we are about to add is legal */
+ l = 0;
+ do {
+ n = *srcp;
+ if ((n & NS_CMPRSFLGS) != 0 && n != 0x41) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ if (n == 0x41)
+ n = *++srcp / 8;
+ l += n + 1;
+ if (l > MAXCDNAME) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ srcp += n + 1;
+ } while (n != 0);
+
+ /* from here on we need to reset compression pointer array on error */
+ srcp = src;
+ do {
+ /* Look to see if we can use pointers. */
+ n = *srcp;
+ if (n != 0 && n != 0x41 && msg != NULL) {
+ l = dn_find(srcp, msg, (const u_char * const *)dnptrs,
+ (const u_char * const *)lpp);
+ if (l >= 0) {
+ if (dstp + 1 >= eob) {
+ goto cleanup;
+ }
+ *dstp++ = (l >> 8) | NS_CMPRSFLGS;
+ *dstp++ = l % 256;
+ return (dstp - dst);
+ }
+ /* Not found, save it. */
+ if (lastdnptr != NULL && cpp < lastdnptr - 1 &&
+ (dstp - msg) < 0x4000 && first) {
+ *cpp++ = dstp;
+ *cpp = NULL;
+ first = 0;
+ }
+ }
+ /* copy label to buffer */
+ if ((n & NS_CMPRSFLGS) != 0 && n != 0x41) { /* Should not happen. */
+ goto cleanup;
+ }
+ if (n == 0x41) {
+ n = *++srcp / 8;
+ if (dstp + 1 >= eob)
+ goto cleanup;
+ *dstp++ = 0x41;
+ }
+ if (dstp + 1 + n >= eob) {
+ goto cleanup;
+ }
+ memcpy(dstp, srcp, n + 1);
+ srcp += n + 1;
+ dstp += n + 1;
+ } while (n != 0);
+
+ if (dstp > eob) {
+cleanup:
+ if (msg != NULL)
+ *lpp = NULL;
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ return (dstp - dst);
+}
+
+
+int
+ns_name_pton(const char *src, u_char *dst, size_t dstsiz) {
+ u_char *label, *bp, *eom;
+ int c, n, escaped;
+ char *cp;
+
+ escaped = 0;
+ bp = dst;
+ eom = dst + dstsiz;
+ label = bp++;
+
+ while ((c = *src++) != 0) {
+ if (escaped) {
+ if ((cp = strchr(digits, c)) != NULL) {
+ n = (cp - digits) * 100;
+ if ((c = *src++) == 0 ||
+ (cp = strchr(digits, c)) == NULL) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ n += (cp - digits) * 10;
+ if ((c = *src++) == 0 ||
+ (cp = strchr(digits, c)) == NULL) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ n += (cp - digits);
+ if (n > 255) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ c = n;
+ } else if (c == '[' && label == bp - 1 && *src == 'x') {
+ /* Theoretically we would have to handle \[o
+ as well but we do not since we do not need
+ it internally. */
+ *label = 0x41;
+ label = bp++;
+ ++src;
+ while (isxdigit (*src)) {
+ n = *src > '9' ? *src - 'a' + 10 : *src - '0';
+ ++src;
+ if (! isxdigit(*src)) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ n <<= 4;
+ n += *src > '9' ? *src - 'a' + 10 : *src - '0';
+ if (bp + 1 >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ *bp++ = n;
+ ++src;
+ }
+ *label = (bp - label - 1) * 8;
+ if (*src++ != ']' || *src++ != '.') {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ escaped = 0;
+ label = bp++;
+ if (bp >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ continue;
+ }
+ escaped = 0;
+ } else if (c == '\\') {
+ escaped = 1;
+ continue;
+ } else if (c == '.') {
+ c = (bp - label - 1);
+ if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ if (label >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ *label = c;
+ /* Fully qualified ? */
+ if (*src == '\0') {
+ if (c != 0) {
+ if (bp >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ *bp++ = '\0';
+ }
+ if ((bp - dst) > MAXCDNAME) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ return (1);
+ }
+ if (c == 0 || *src == '.') {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ label = bp++;
+ continue;
+ }
+ if (bp >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ *bp++ = (u_char)c;
+ }
+ c = (bp - label - 1);
+ if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ if (label >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ *label = c;
+ if (c != 0) {
+ if (bp >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ *bp++ = 0;
+ }
+ if ((bp - dst) > MAXCDNAME) { /* src too big */
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ return (0);
+}
+
+
+
+int
+ns_name_compress(const char *src, u_char *dst, size_t dstsiz,
+ const u_char **dnptrs, const u_char **lastdnptr)
+{
+ u_char tmp[NS_MAXCDNAME];
+
+ if (ns_name_pton(src, tmp, sizeof tmp) == -1)
+ return (-1);
+ return (ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr));
+}
+
+
+int
+dn_comp(const char *src, u_char *dst, int dstsiz,
+ u_char **dnptrs, u_char **lastdnptr)
+{
+ return (ns_name_compress(src, dst, (size_t)dstsiz,
+ (const u_char **)dnptrs,
+ (const u_char **)lastdnptr));
+}
+
+
+
+
+int
+res_nmkquery(res_state statp,
+ int op, /* opcode of query */
+ const char *dname, /* domain name */
+ int class, int type, /* class and type of query */
+ const u_char *data, /* resource record data */
+ int datalen, /* length of data */
+ const u_char *newrr_in, /* new rr for modify or append */
+ u_char *buf, /* buffer to put query */
+ int buflen) /* size of buffer */
+{
+ register HEADER *hp;
+ register u_char *cp;
+ register int n;
+ u_char *dnptrs[20], **dpp, **lastdnptr;
+
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf(";; res_nmkquery(%s, %s, %s, %s)\n",
+ _res_opcodes[op], dname, p_class(class), p_type(type));
+#endif
+ /*
+ * Initialize header fields.
+ */
+ if ((buf == NULL) || (buflen < HFIXEDSZ))
+ return (-1);
+ memset(buf, 0, HFIXEDSZ);
+ hp = (HEADER *) buf;
+ /* We randomize the IDs every time. The old code just
+ incremented by one after the initial randomization which
+ still predictable if the application does multiple
+ requests. */
+#if 0
+ hp->id = htons(++statp->id);
+#else
+ hp->id = htons(statp->id);
+ int randombits;
+ do
+ {
+#ifdef RANDOM_BITS
+ RANDOM_BITS (randombits);
+#else
+ struct timeval tv;
+ gettimeofday (&tv, NULL);
+ randombits = (tv.tv_sec << 8) ^ tv.tv_usec;
+#endif
+ }
+ while ((randombits & 0xffff) == 0);
+ statp->id = (statp->id + randombits) & 0xffff;
+#endif
+ hp->opcode = op;
+ hp->rd = (statp->options & RES_RECURSE) != 0;
+ hp->rcode = NOERROR;
+ cp = buf + HFIXEDSZ;
+ buflen -= HFIXEDSZ;
+ dpp = dnptrs;
+ *dpp++ = buf;
+ *dpp++ = NULL;
+ lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
+ /*
+ * perform opcode specific processing
+ */
+ switch (op) {
+ case QUERY: /*FALLTHROUGH*/
+ case NS_NOTIFY_OP:
+ if ((buflen -= QFIXEDSZ) < 0)
+ return (-1);
+ if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
+ return (-1);
+ cp += n;
+ buflen -= n;
+ __putshort(type, cp);
+ cp += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ hp->qdcount = htons(1);
+ if (op == QUERY || data == NULL)
+ break;
+ /*
+ * Make an additional record for completion domain.
+ */
+ buflen -= RRFIXEDSZ;
+ n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
+ if (n < 0)
+ return (-1);
+ cp += n;
+ buflen -= n;
+ __putshort(T_NULL, cp);
+ cp += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ __putlong(0, cp);
+ cp += INT32SZ;
+ __putshort(0, cp);
+ cp += INT16SZ;
+ hp->arcount = htons(1);
+ break;
+
+ case IQUERY:
+ /*
+ * Initialize answer section
+ */
+ if (buflen < 1 + RRFIXEDSZ + datalen)
+ return (-1);
+ *cp++ = '\0'; /* no domain name */
+ __putshort(type, cp);
+ cp += INT16SZ;
+ __putshort(class, cp);
+ cp += INT16SZ;
+ __putlong(0, cp);
+ cp += INT32SZ;
+ __putshort(datalen, cp);
+ cp += INT16SZ;
+ if (datalen) {
+ memcpy(cp, data, datalen);
+ cp += datalen;
+ }
+ hp->ancount = htons(1);
+ break;
+
+ default:
+ return (-1);
+ }
+ return (cp - buf);
+}
+
+int
+res_mkquery(int op, /* opcode of query */
+ const char *dname, /* domain name */
+ int class, int type, /* class and type of query */
+ const u_char *data, /* resource record data */
+ int datalen, /* length of data */
+ const u_char *newrr_in, /* new rr for modify or append */
+ u_char *buf, /* buffer to put query */
+ int buflen) /* size of buffer */
+{
+ return (res_nmkquery(&_res, op, dname, class, type,
+ data, datalen,
+ newrr_in, buf, buflen));
+}
+
+#endif
void dorequest(char *s,int type,word id)
{
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