867 lines
20 KiB
C
867 lines
20 KiB
C
/*
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* Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#if !defined(_LIBC) && !defined(lint)
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static const char rcsid[] = "$BINDId: ns_print.c,v 8.18 2000/02/29 05:48:12 vixie Exp $";
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#endif
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/* Import. */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <errno.h>
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#include <resolv.h>
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#include <string.h>
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#include <ctype.h>
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) ((size_t)sprintf x)
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#endif
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/* Forward. */
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static size_t prune_origin(const char *name, const char *origin);
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static int charstr(const u_char *rdata, const u_char *edata,
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char **buf, size_t *buflen);
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static int addname(const u_char *msg, size_t msglen,
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const u_char **p, const char *origin,
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char **buf, size_t *buflen);
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static void addlen(size_t len, char **buf, size_t *buflen);
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static int addstr(const char *src, size_t len,
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char **buf, size_t *buflen);
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static int addtab(size_t len, size_t target, int spaced,
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char **buf, size_t *buflen);
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/* Proto. */
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#ifndef _LIBC
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u_int16_t dst_s_dns_key_id(const u_char *, const int);
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#endif
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/* Macros. */
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#define T(x) \
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do { \
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if ((x) < 0) \
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return (-1); \
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} while (0)
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/* Public. */
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/*
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* int
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* ns_sprintrr(handle, rr, name_ctx, origin, buf, buflen)
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* Convert an RR to presentation format.
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* return:
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* Number of characters written to buf, or -1 (check errno).
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*/
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int
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ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
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const char *name_ctx, const char *origin,
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char *buf, size_t buflen)
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{
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int n;
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n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
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ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
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ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
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name_ctx, origin, buf, buflen);
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return (n);
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}
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/*
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* int
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* ns_sprintrrf(msg, msglen, name, class, type, ttl, rdata, rdlen,
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* name_ctx, origin, buf, buflen)
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* Convert the fields of an RR into presentation format.
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* return:
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* Number of characters written to buf, or -1 (check errno).
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*/
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int
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ns_sprintrrf(const u_char *msg, size_t msglen,
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const char *name, ns_class class, ns_type type,
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u_long ttl, const u_char *rdata, size_t rdlen,
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const char *name_ctx, const char *origin,
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char *buf, size_t buflen)
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{
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const char *obuf = buf;
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const u_char *edata = rdata + rdlen;
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int spaced = 0;
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const char *comment;
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char tmp[100];
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char errbuf[40];
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int len, x;
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/*
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* Owner.
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*/
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if (name_ctx != NULL && ns_samename(name_ctx, name) == 1) {
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T(addstr("\t\t\t", 3, &buf, &buflen));
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} else {
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len = prune_origin(name, origin);
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if (len == 0) {
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T(addstr("@\t\t\t", 4, &buf, &buflen));
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} else {
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T(addstr(name, len, &buf, &buflen));
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/* Origin not used or not root, and no trailing dot? */
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if (((origin == NULL || origin[0] == '\0') ||
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(origin[0] != '.' && origin[1] != '\0' &&
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name[len] == '\0')) && name[len - 1] != '.') {
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T(addstr(".", 1, &buf, &buflen));
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len++;
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}
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T(spaced = addtab(len, 24, spaced, &buf, &buflen));
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}
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}
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/*
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* TTL, Class, Type.
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*/
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T(x = ns_format_ttl(ttl, buf, buflen));
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addlen(x, &buf, &buflen);
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len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
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T(addstr(tmp, len, &buf, &buflen));
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T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));
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/*
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* RData.
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*/
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switch (type) {
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case ns_t_a:
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if (rdlen != NS_INADDRSZ)
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goto formerr;
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(void) inet_ntop(AF_INET, rdata, buf, buflen);
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addlen(strlen(buf), &buf, &buflen);
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break;
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case ns_t_cname:
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case ns_t_mb:
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case ns_t_mg:
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case ns_t_mr:
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case ns_t_ns:
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case ns_t_ptr:
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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break;
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case ns_t_hinfo:
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case ns_t_isdn:
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/* First word. */
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T(len = charstr(rdata, edata, &buf, &buflen));
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if (len == 0)
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goto formerr;
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rdata += len;
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T(addstr(" ", 1, &buf, &buflen));
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/* Second word, optional in ISDN records. */
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if (type == ns_t_isdn && rdata == edata)
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break;
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T(len = charstr(rdata, edata, &buf, &buflen));
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if (len == 0)
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goto formerr;
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rdata += len;
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break;
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case ns_t_soa: {
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u_long t;
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/* Server name. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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T(addstr(" ", 1, &buf, &buflen));
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/* Administrator name. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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T(addstr(" (\n", 3, &buf, &buflen));
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spaced = 0;
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if ((edata - rdata) != 5*NS_INT32SZ)
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goto formerr;
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/* Serial number. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
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len = SPRINTF((tmp, "%lu", t));
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T(addstr(tmp, len, &buf, &buflen));
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T(spaced = addtab(len, 16, spaced, &buf, &buflen));
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T(addstr("; serial\n", 9, &buf, &buflen));
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spaced = 0;
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/* Refresh interval. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
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T(len = ns_format_ttl(t, buf, buflen));
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addlen(len, &buf, &buflen);
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T(spaced = addtab(len, 16, spaced, &buf, &buflen));
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T(addstr("; refresh\n", 10, &buf, &buflen));
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spaced = 0;
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/* Retry interval. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
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T(len = ns_format_ttl(t, buf, buflen));
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addlen(len, &buf, &buflen);
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T(spaced = addtab(len, 16, spaced, &buf, &buflen));
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T(addstr("; retry\n", 8, &buf, &buflen));
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spaced = 0;
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/* Expiry. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
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T(len = ns_format_ttl(t, buf, buflen));
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addlen(len, &buf, &buflen);
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T(spaced = addtab(len, 16, spaced, &buf, &buflen));
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T(addstr("; expiry\n", 9, &buf, &buflen));
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spaced = 0;
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/* Minimum TTL. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
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T(len = ns_format_ttl(t, buf, buflen));
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addlen(len, &buf, &buflen);
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T(addstr(" )", 2, &buf, &buflen));
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T(spaced = addtab(len, 16, spaced, &buf, &buflen));
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T(addstr("; minimum\n", 10, &buf, &buflen));
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break;
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}
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case ns_t_mx:
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case ns_t_afsdb:
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case ns_t_rt: {
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u_int t;
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if (rdlen < NS_INT16SZ)
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goto formerr;
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/* Priority. */
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t = ns_get16(rdata);
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rdata += NS_INT16SZ;
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len = SPRINTF((tmp, "%u ", t));
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T(addstr(tmp, len, &buf, &buflen));
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/* Target. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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break;
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}
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case ns_t_px: {
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u_int t;
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if (rdlen < NS_INT16SZ)
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goto formerr;
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/* Priority. */
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t = ns_get16(rdata);
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rdata += NS_INT16SZ;
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len = SPRINTF((tmp, "%u ", t));
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T(addstr(tmp, len, &buf, &buflen));
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/* Name1. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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T(addstr(" ", 1, &buf, &buflen));
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/* Name2. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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break;
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}
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case ns_t_x25:
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T(len = charstr(rdata, edata, &buf, &buflen));
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if (len == 0)
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goto formerr;
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rdata += len;
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break;
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|
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case ns_t_txt:
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while (rdata < edata) {
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T(len = charstr(rdata, edata, &buf, &buflen));
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if (len == 0)
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goto formerr;
|
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rdata += len;
|
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if (rdata < edata)
|
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T(addstr(" ", 1, &buf, &buflen));
|
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}
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break;
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|
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case ns_t_nsap: {
|
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/* 2*255 for hex digits, 128 for '.' and '\0', 2 for
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0x if inet_nsap_ntoa starts using it. */
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char t[255*2 + 128 + 2];
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(void) inet_nsap_ntoa(rdlen, rdata, t);
|
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T(addstr(t, strlen(t), &buf, &buflen));
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break;
|
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}
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|
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case ns_t_aaaa:
|
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if (rdlen != NS_IN6ADDRSZ)
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goto formerr;
|
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(void) inet_ntop(AF_INET6, rdata, buf, buflen);
|
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addlen(strlen(buf), &buf, &buflen);
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break;
|
|
|
|
case ns_t_loc: {
|
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char t[255];
|
|
|
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/* XXX protocol format checking? */
|
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(void) loc_ntoa(rdata, t);
|
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T(addstr(t, strlen(t), &buf, &buflen));
|
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break;
|
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}
|
|
|
|
case ns_t_naptr: {
|
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u_int order, preference;
|
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char t[50];
|
|
|
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if (rdlen < 2*NS_INT16SZ)
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goto formerr;
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|
|
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/* Order, Precedence. */
|
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order = ns_get16(rdata); rdata += NS_INT16SZ;
|
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preference = ns_get16(rdata); rdata += NS_INT16SZ;
|
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len = SPRINTF((t, "%u %u ", order, preference));
|
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T(addstr(t, len, &buf, &buflen));
|
|
|
|
/* Flags. */
|
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T(len = charstr(rdata, edata, &buf, &buflen));
|
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if (len == 0)
|
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goto formerr;
|
|
rdata += len;
|
|
T(addstr(" ", 1, &buf, &buflen));
|
|
|
|
/* Service. */
|
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T(len = charstr(rdata, edata, &buf, &buflen));
|
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if (len == 0)
|
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goto formerr;
|
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rdata += len;
|
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T(addstr(" ", 1, &buf, &buflen));
|
|
|
|
/* Regexp. */
|
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T(len = charstr(rdata, edata, &buf, &buflen));
|
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if (len < 0)
|
|
return (-1);
|
|
if (len == 0)
|
|
goto formerr;
|
|
rdata += len;
|
|
T(addstr(" ", 1, &buf, &buflen));
|
|
|
|
/* Server. */
|
|
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
|
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break;
|
|
}
|
|
|
|
case ns_t_srv: {
|
|
u_int priority, weight, port;
|
|
char t[50];
|
|
|
|
if (rdlen < NS_INT16SZ*3)
|
|
goto formerr;
|
|
|
|
/* Priority, Weight, Port. */
|
|
priority = ns_get16(rdata); rdata += NS_INT16SZ;
|
|
weight = ns_get16(rdata); rdata += NS_INT16SZ;
|
|
port = ns_get16(rdata); rdata += NS_INT16SZ;
|
|
len = SPRINTF((t, "%u %u %u ", priority, weight, port));
|
|
T(addstr(t, len, &buf, &buflen));
|
|
|
|
/* Server. */
|
|
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
|
|
break;
|
|
}
|
|
|
|
case ns_t_minfo:
|
|
case ns_t_rp:
|
|
/* Name1. */
|
|
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
|
|
T(addstr(" ", 1, &buf, &buflen));
|
|
|
|
/* Name2. */
|
|
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
|
|
|
|
break;
|
|
|
|
case ns_t_wks: {
|
|
int n, lcnt;
|
|
|
|
if (rdlen < NS_INT32SZ + 1)
|
|
goto formerr;
|
|
|
|
/* Address. */
|
|
(void) inet_ntop(AF_INET, rdata, buf, buflen);
|
|
addlen(strlen(buf), &buf, &buflen);
|
|
rdata += NS_INADDRSZ;
|
|
|
|
/* Protocol. */
|
|
len = SPRINTF((tmp, " %u ( ", *rdata));
|
|
T(addstr(tmp, len, &buf, &buflen));
|
|
rdata += NS_INT8SZ;
|
|
|
|
/* Bit map. */
|
|
n = 0;
|
|
lcnt = 0;
|
|
while (rdata < edata) {
|
|
u_int c = *rdata++;
|
|
do {
|
|
if (c & 0200) {
|
|
if (lcnt == 0) {
|
|
T(addstr("\n\t\t\t\t", 5,
|
|
&buf, &buflen));
|
|
lcnt = 10;
|
|
spaced = 0;
|
|
}
|
|
len = SPRINTF((tmp, "%d ", n));
|
|
T(addstr(tmp, len, &buf, &buflen));
|
|
lcnt--;
|
|
}
|
|
c <<= 1;
|
|
} while (++n & 07);
|
|
}
|
|
T(addstr(")", 1, &buf, &buflen));
|
|
|
|
break;
|
|
}
|
|
|
|
case ns_t_key: {
|
|
#ifndef _LIBC
|
|
char base64_key[NS_MD5RSA_MAX_BASE64];
|
|
u_int keyflags, protocol, algorithm, key_id;
|
|
const char *leader;
|
|
int n;
|
|
|
|
if (rdlen < NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
|
|
goto formerr;
|
|
|
|
/* Key flags, Protocol, Algorithm. */
|
|
key_id = dst_s_dns_key_id(rdata, edata-rdata);
|
|
keyflags = ns_get16(rdata); rdata += NS_INT16SZ;
|
|
protocol = *rdata++;
|
|
algorithm = *rdata++;
|
|
len = SPRINTF((tmp, "0x%04x %u %u",
|
|
keyflags, protocol, algorithm));
|
|
T(addstr(tmp, len, &buf, &buflen));
|
|
|
|
/* Public key data. */
|
|
len = b64_ntop(rdata, edata - rdata,
|
|
base64_key, sizeof base64_key);
|
|
if (len < 0)
|
|
goto formerr;
|
|
if (len > 15) {
|
|
T(addstr(" (", 2, &buf, &buflen));
|
|
leader = "\n\t\t";
|
|
spaced = 0;
|
|
} else
|
|
leader = " ";
|
|
for (n = 0; n < len; n += 48) {
|
|
T(addstr(leader, strlen(leader), &buf, &buflen));
|
|
T(addstr(base64_key + n, MIN(len - n, 48),
|
|
&buf, &buflen));
|
|
}
|
|
if (len > 15)
|
|
T(addstr(" )", 2, &buf, &buflen));
|
|
n = SPRINTF((tmp, " ; key_tag= %u", key_id));
|
|
T(addstr(tmp, n, &buf, &buflen));
|
|
#endif /* !_LIBC */
|
|
|
|
break;
|
|
}
|
|
|
|
case ns_t_sig: {
|
|
#ifndef _LIBC
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char base64_key[NS_MD5RSA_MAX_BASE64];
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u_int type, algorithm, labels, footprint;
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const char *leader;
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u_long t;
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int n;
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if (rdlen < 22)
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goto formerr;
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/* Type covered, Algorithm, Label count, Original TTL. */
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type = ns_get16(rdata); rdata += NS_INT16SZ;
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algorithm = *rdata++;
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labels = *rdata++;
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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len = SPRINTF((tmp, "%s %d %d %lu ",
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p_type(type), algorithm, labels, t));
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T(addstr(tmp, len, &buf, &buflen));
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if (labels > (u_int)dn_count_labels(name))
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goto formerr;
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/* Signature expiry. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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len = SPRINTF((tmp, "%s ", p_secstodate(t)));
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T(addstr(tmp, len, &buf, &buflen));
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/* Time signed. */
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t = ns_get32(rdata); rdata += NS_INT32SZ;
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len = SPRINTF((tmp, "%s ", p_secstodate(t)));
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T(addstr(tmp, len, &buf, &buflen));
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/* Signature Footprint. */
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footprint = ns_get16(rdata); rdata += NS_INT16SZ;
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len = SPRINTF((tmp, "%u ", footprint));
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T(addstr(tmp, len, &buf, &buflen));
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/* Signer's name. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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/* Signature. */
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len = b64_ntop(rdata, edata - rdata,
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base64_key, sizeof base64_key);
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if (len > 15) {
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T(addstr(" (", 2, &buf, &buflen));
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leader = "\n\t\t";
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spaced = 0;
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} else
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leader = " ";
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if (len < 0)
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goto formerr;
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for (n = 0; n < len; n += 48) {
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T(addstr(leader, strlen(leader), &buf, &buflen));
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T(addstr(base64_key + n, MIN(len - n, 48),
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&buf, &buflen));
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}
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if (len > 15)
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T(addstr(" )", 2, &buf, &buflen));
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#endif /* !_LIBC */
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break;
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}
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case ns_t_nxt: {
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int n, c;
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/* Next domain name. */
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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/* Type bit map. */
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n = edata - rdata;
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for (c = 0; c < n*8; c++)
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if (NS_NXT_BIT_ISSET(c, rdata)) {
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len = SPRINTF((tmp, " %s", p_type(c)));
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T(addstr(tmp, len, &buf, &buflen));
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}
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break;
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}
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case ns_t_cert: {
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u_int c_type, key_tag, alg;
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int n, siz;
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char base64_cert[8192], *leader, tmp[40];
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c_type = ns_get16(rdata); rdata += NS_INT16SZ;
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key_tag = ns_get16(rdata); rdata += NS_INT16SZ;
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alg = (u_int) *rdata++;
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len = SPRINTF((tmp, "%d %d %d ", c_type, key_tag, alg));
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T(addstr(tmp, len, &buf, &buflen));
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siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
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if (siz > sizeof(base64_cert) * 3/4) {
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char *str = "record too long to print";
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T(addstr(str, strlen(str), &buf, &buflen));
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}
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else {
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len = b64_ntop(rdata, edata-rdata, base64_cert, siz);
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if (len < 0)
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goto formerr;
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else if (len > 15) {
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T(addstr(" (", 2, &buf, &buflen));
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leader = "\n\t\t";
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spaced = 0;
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}
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else
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leader = " ";
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for (n = 0; n < len; n += 48) {
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T(addstr(leader, strlen(leader),
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&buf, &buflen));
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T(addstr(base64_cert + n, MIN(len - n, 48),
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&buf, &buflen));
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}
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if (len > 15)
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T(addstr(" )", 2, &buf, &buflen));
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}
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break;
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}
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case ns_t_tsig: {
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/* BEW - need to complete this */
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int n;
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T(len = addname(msg, msglen, &rdata, origin, &buf, &buflen));
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T(addstr(" ", 1, &buf, &buflen));
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rdata += 8; /* time */
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n = ns_get16(rdata); rdata += INT16SZ;
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rdata += n; /* sig */
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n = ns_get16(rdata); rdata += INT16SZ; /* original id */
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sprintf(buf, "%d", ns_get16(rdata));
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rdata += INT16SZ;
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addlen(strlen(buf), &buf, &buflen);
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break;
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}
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case ns_t_a6: {
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struct in6_addr a;
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int pbyte, pbit;
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/* prefix length */
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if (rdlen == 0U) goto formerr;
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len = SPRINTF((tmp, "%d ", *rdata));
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T(addstr(tmp, len, &buf, &buflen));
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pbit = *rdata;
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if (pbit > 128) goto formerr;
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pbyte = (pbit & ~7) / 8;
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rdata++;
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/* address suffix: provided only when prefix len != 128 */
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if (pbit < 128) {
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if (rdata + pbyte >= edata) goto formerr;
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memset(&a, 0, sizeof(a));
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memcpy(&a.s6_addr[pbyte], rdata, sizeof(a) - pbyte);
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(void) inet_ntop(AF_INET6, &a, buf, buflen);
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addlen(strlen(buf), &buf, &buflen);
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rdata += sizeof(a) - pbyte;
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}
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/* prefix name: provided only when prefix len > 0 */
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if (pbit == 0)
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break;
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if (rdata >= edata) goto formerr;
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T(addstr(" ", 1, &buf, &buflen));
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T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
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break;
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}
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case ns_t_opt: {
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len = SPRINTF((tmp, "%u bytes", class));
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T(addstr(tmp, len, &buf, &buflen));
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break;
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}
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default:
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snprintf (errbuf, sizeof (errbuf), "unknown RR type %d", type);
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comment = errbuf;
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goto hexify;
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}
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return (buf - obuf);
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formerr:
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comment = "RR format error";
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hexify: {
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int n, m;
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char *p;
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len = SPRINTF((tmp, "\\#(\t\t; %s", comment));
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T(addstr(tmp, len, &buf, &buflen));
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while (rdata < edata) {
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p = tmp;
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p += SPRINTF((p, "\n\t"));
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spaced = 0;
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n = MIN(16, edata - rdata);
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for (m = 0; m < n; m++)
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p += SPRINTF((p, "%02x ", rdata[m]));
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T(addstr(tmp, p - tmp, &buf, &buflen));
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if (n < 16) {
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T(addstr(")", 1, &buf, &buflen));
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T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));
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}
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p = tmp;
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p += SPRINTF((p, "; "));
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for (m = 0; m < n; m++)
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*p++ = (isascii(rdata[m]) && isprint(rdata[m]))
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? rdata[m]
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: '.';
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T(addstr(tmp, p - tmp, &buf, &buflen));
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rdata += n;
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}
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return (buf - obuf);
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}
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}
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/* Private. */
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/*
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* size_t
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* prune_origin(name, origin)
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* Find out if the name is at or under the current origin.
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* return:
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* Number of characters in name before start of origin,
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* or length of name if origin does not match.
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* notes:
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* This function should share code with samedomain().
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*/
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static size_t
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prune_origin(const char *name, const char *origin) {
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const char *oname = name;
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while (*name != '\0') {
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if (origin != NULL && ns_samename(name, origin) == 1)
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return (name - oname - (name > oname));
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while (*name != '\0') {
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if (*name == '\\') {
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name++;
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/* XXX need to handle \nnn form. */
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if (*name == '\0')
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break;
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} else if (*name == '.') {
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name++;
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break;
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}
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name++;
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}
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}
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return (name - oname);
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}
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/*
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* int
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* charstr(rdata, edata, buf, buflen)
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* Format a <character-string> into the presentation buffer.
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* return:
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* Number of rdata octets consumed
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* 0 for protocol format error
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* -1 for output buffer error
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* side effects:
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* buffer is advanced on success.
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*/
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static int
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charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
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const u_char *odata = rdata;
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size_t save_buflen = *buflen;
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char *save_buf = *buf;
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if (addstr("\"", 1, buf, buflen) < 0)
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goto enospc;
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if (rdata < edata) {
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int n = *rdata;
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if (rdata + 1 + n <= edata) {
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rdata++;
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while (n-- > 0) {
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if (strchr("\n\"\\", *rdata) != NULL)
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if (addstr("\\", 1, buf, buflen) < 0)
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goto enospc;
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if (addstr((const char *)rdata, 1,
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buf, buflen) < 0)
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goto enospc;
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rdata++;
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}
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}
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}
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if (addstr("\"", 1, buf, buflen) < 0)
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goto enospc;
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return (rdata - odata);
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enospc:
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__set_errno (ENOSPC);
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*buf = save_buf;
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*buflen = save_buflen;
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return (-1);
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}
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static int
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addname(const u_char *msg, size_t msglen,
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const u_char **pp, const char *origin,
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char **buf, size_t *buflen)
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{
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size_t newlen, save_buflen = *buflen;
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char *save_buf = *buf;
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int n;
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n = dn_expand(msg, msg + msglen, *pp, *buf, *buflen);
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if (n < 0)
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goto enospc; /* Guess. */
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newlen = prune_origin(*buf, origin);
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if (newlen == 0) {
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/* Use "@" instead of name. */
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if (newlen + 2 > *buflen)
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goto enospc; /* No room for "@\0". */
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(*buf)[newlen++] = '@';
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(*buf)[newlen] = '\0';
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} else {
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if (((origin == NULL || origin[0] == '\0') ||
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(origin[0] != '.' && origin[1] != '\0' &&
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(*buf)[newlen] == '\0')) && (*buf)[newlen - 1] != '.') {
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/* No trailing dot. */
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if (newlen + 2 > *buflen)
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goto enospc; /* No room for ".\0". */
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(*buf)[newlen++] = '.';
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(*buf)[newlen] = '\0';
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}
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}
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*pp += n;
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addlen(newlen, buf, buflen);
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**buf = '\0';
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return (newlen);
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enospc:
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__set_errno (ENOSPC);
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*buf = save_buf;
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*buflen = save_buflen;
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return (-1);
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}
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static void
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addlen(size_t len, char **buf, size_t *buflen) {
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assert(len <= *buflen);
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*buf += len;
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*buflen -= len;
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}
|
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|
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static int
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addstr(const char *src, size_t len, char **buf, size_t *buflen) {
|
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if (len >= *buflen) {
|
|
__set_errno (ENOSPC);
|
|
return (-1);
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|
}
|
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memcpy(*buf, src, len);
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addlen(len, buf, buflen);
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|
**buf = '\0';
|
|
return (0);
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}
|
|
|
|
static int
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addtab(size_t len, size_t target, int spaced, char **buf, size_t *buflen) {
|
|
size_t save_buflen = *buflen;
|
|
char *save_buf = *buf;
|
|
int t;
|
|
|
|
if (spaced || len >= target - 1) {
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T(addstr(" ", 2, buf, buflen));
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spaced = 1;
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} else {
|
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for (t = (target - len - 1) / 8; t >= 0; t--)
|
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if (addstr("\t", 1, buf, buflen) < 0) {
|
|
*buflen = save_buflen;
|
|
*buf = save_buf;
|
|
return (-1);
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}
|
|
spaced = 0;
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}
|
|
return (spaced);
|
|
}
|