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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [ns_print.c] - Blame information for rev 1765

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/*
 * Copyright (c) 1996, 1998 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */
 
#if !defined(__rtems__)
#if !defined(LINT) && !defined(CODECENTER)
static char rcsid[] = "$Id: ns_print.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
#endif /* not lint */
#endif /* not rtems */
 
/* Import. */
 
#include <sys/types.h>
#include <sys/socket.h>
 
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
 
#include <assert.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
#include <ctype.h>
 
#define SPRINTF(x) ((size_t)sprintf x)
 
/* Forward. */
 
static size_t   prune_origin(const char *name, const char *origin);
static int      charstr(const u_char *rdata, const u_char *edata,
                        char **buf, size_t *buflen);
static int      addname(const u_char *msg, size_t msglen,
                        const u_char **p, const char *origin,
                        char **buf, size_t *buflen);
static void     addlen(size_t len, char **buf, size_t *buflen);
static int      addstr(const char *src, size_t len,
                       char **buf, size_t *buflen);
static int      addtab(size_t len, size_t target, int spaced,
                       char **buf, size_t *buflen);
 
/* Macros. */
 
#define T(x) \
        do { \
                if ((x) < 0) \
                        return (-1); \
        } while (0)
 
/* Public. */
 
/*
 * int
 * ns_sprintrr(handle, rr, name_ctx, origin, buf, buflen)
 *      Convert an RR to presentation format.
 * return:
 *      Number of characters written to buf, or -1 (check errno).
 */
int
ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
            const char *name_ctx, const char *origin,
            char *buf, size_t buflen)
{
        int n;
 
        n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
                         ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
                         ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
                         name_ctx, origin, buf, buflen);
        return (n);
}
 
/*
 * int
 * ns_sprintrrf(msg, msglen, name, class, type, ttl, rdata, rdlen,
 *             name_ctx, origin, buf, buflen)
 *      Convert the fields of an RR into presentation format.
 * return:
 *      Number of characters written to buf, or -1 (check errno).
 */
int
ns_sprintrrf(const u_char *msg, size_t msglen,
            const char *name, ns_class class, ns_type type,
            u_long ttl, const u_char *rdata, size_t rdlen,
            const char *name_ctx, const char *origin,
            char *buf, size_t buflen)
{
        const char *obuf = buf;
        const u_char *edata = rdata + rdlen;
        int spaced = 0;
 
        const char *comment;
        char tmp[100];
        int len, x;
 
        /*
         * Owner.
         */
        if (name_ctx != NULL && strcasecmp(name_ctx, name) == 0) {
                T(addstr("\t\t\t", 3, &buf, &buflen));
        } else {
                len = prune_origin(name, origin);
                if (len == 0) {
                        T(addstr("@\t\t\t", 4, &buf, &buflen));
                } else {
                        T(addstr(name, len, &buf, &buflen));
                        /* Origin not used and no trailing dot? */
                        if ((!origin || !origin[0] || name[len] == '\0') &&
                            name[len - 1] != '.') {
                                T(addstr(".", 1, &buf, &buflen));
                                len++;
                        }
                        T(spaced = addtab(len, 24, spaced, &buf, &buflen));
                }
        }
 
        /*
         * TTL, Class, Type.
         */
        T(x = ns_format_ttl(ttl, buf, buflen));
        addlen(x, &buf, &buflen);
        len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
        T(addstr(tmp, len, &buf, &buflen));
        T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));
 
        /*
         * RData.
         */
        switch (type) {
        case ns_t_a:
                if (rdlen != NS_INADDRSZ)
                        goto formerr;
                (void) inet_ntop(AF_INET, rdata, buf, buflen);
                addlen(strlen(buf), &buf, &buflen);
                break;
 
        case ns_t_cname:
        case ns_t_mb:
        case ns_t_mg:
        case ns_t_mr:
        case ns_t_ns:
        case ns_t_ptr:
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
                break;
 
        case ns_t_hinfo:
        case ns_t_isdn:
                /* First word. */
                T(len = charstr(rdata, edata, &buf, &buflen));
                if (len == 0)
                        goto formerr;
                rdata += len;
                T(addstr(" ", 1, &buf, &buflen));
 
                /* Second word. */
                T(len = charstr(rdata, edata, &buf, &buflen));
                if (len == 0)
                        goto formerr;
                rdata += len;
                break;
 
        case ns_t_soa: {
                u_long t;
 
                /* Server name. */
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
                T(addstr(" ", 1, &buf, &buflen));
 
                /* Administrator name. */
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
                T(addstr(" (\n", 3, &buf, &buflen));
                spaced = 0;
 
                if ((edata - rdata) != 5*NS_INT32SZ)
                        goto formerr;
 
                /* Serial number. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
                len = SPRINTF((tmp, "%lu", t));
                T(addstr(tmp, len, &buf, &buflen));
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
                T(addstr("; serial\n", 9, &buf, &buflen));
                spaced = 0;
 
                /* Refresh interval. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
                T(len = ns_format_ttl(t, buf, buflen));
                addlen(len, &buf, &buflen);
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
                T(addstr("; refresh\n", 10, &buf, &buflen));
                spaced = 0;
 
                /* Retry interval. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
                T(len = ns_format_ttl(t, buf, buflen));
                addlen(len, &buf, &buflen);
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
                T(addstr("; retry\n", 8, &buf, &buflen));
                spaced = 0;
 
                /* Expiry. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
                T(len = ns_format_ttl(t, buf, buflen));
                addlen(len, &buf, &buflen);
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
                T(addstr("; expiry\n", 9, &buf, &buflen));
                spaced = 0;
 
                /* Minimum TTL. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
                T(len = ns_format_ttl(t, buf, buflen));
                addlen(len, &buf, &buflen);
                T(addstr(" )", 2, &buf, &buflen));
                T(spaced = addtab(len, 16, spaced, &buf, &buflen));
                T(addstr("; minimum\n", 10, &buf, &buflen));
 
                break;
            }
 
        case ns_t_mx:
        case ns_t_afsdb:
        case ns_t_rt: {
                u_int t;
 
                if (rdlen < NS_INT16SZ)
                        goto formerr;
 
                /* Priority. */
                t = ns_get16(rdata);
                rdata += NS_INT16SZ;
                len = SPRINTF((tmp, "%u ", t));
                T(addstr(tmp, len, &buf, &buflen));
 
                /* Target. */
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 
                break;
            }
 
        case ns_t_px: {
                u_int t;
 
                if (rdlen < NS_INT16SZ)
                        goto formerr;
 
                /* Priority. */
                t = ns_get16(rdata);
                rdata += NS_INT16SZ;
                len = SPRINTF((tmp, "%u ", t));
                T(addstr(tmp, len, &buf, &buflen));
 
                /* 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_x25:
                T(len = charstr(rdata, edata, &buf, &buflen));
                if (len == 0)
                        goto formerr;
                rdata += len;
                break;
 
        case ns_t_txt:
                while (rdata < edata) {
                        T(len = charstr(rdata, edata, &buf, &buflen));
                        if (len == 0)
                                goto formerr;
                        rdata += len;
                        if (rdata < edata)
                                T(addstr(" ", 1, &buf, &buflen));
                }
                break;
 
        case ns_t_nsap: {
                char t[255*3];
 
                (void) inet_nsap_ntoa(rdlen, rdata, t);
                T(addstr(t, strlen(t), &buf, &buflen));
                break;
            }
 
        case ns_t_aaaa:
                if (rdlen != NS_IN6ADDRSZ)
                        goto formerr;
                (void) inet_ntop(AF_INET6, rdata, buf, buflen);
                addlen(strlen(buf), &buf, &buflen);
                break;
 
        case ns_t_loc: {
                char t[255];
 
                /* XXX protocol format checking? */
                (void) loc_ntoa(rdata, t);
                T(addstr(t, strlen(t), &buf, &buflen));
                break;
            }
 
        case ns_t_naptr: {
                u_int order, preference;
                char t[50];
 
                if (rdlen < 2*NS_INT16SZ)
                        goto formerr;
 
                /* Order, Precedence. */
                order = ns_get16(rdata);        rdata += NS_INT16SZ;
                preference = ns_get16(rdata);   rdata += NS_INT16SZ;
                len = SPRINTF((t, "%u %u ", order, preference));
                T(addstr(t, len, &buf, &buflen));
 
                /* Flags. */
                T(len = charstr(rdata, edata, &buf, &buflen));
                if (len == 0)
                        goto formerr;
                rdata += len;
                T(addstr(" ", 1, &buf, &buflen));
 
                /* Service. */
                T(len = charstr(rdata, edata, &buf, &buflen));
                if (len == 0)
                        goto formerr;
                rdata += len;
                T(addstr(" ", 1, &buf, &buflen));
 
                /* Regexp. */
                T(len = charstr(rdata, edata, &buf, &buflen));
                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));
                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: {
                char base64_key[NS_MD5RSA_MAX_BASE64];
                u_int keyflags, protocol, algorithm;
                const char *leader;
                int n;
 
                if (rdlen < NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
                        goto formerr;
 
                /* Key flags, Protocol, Algorithm. */
                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));
 
                break;
            }
 
        case ns_t_sig: {
                char base64_key[NS_MD5RSA_MAX_BASE64];
                u_int type, algorithm, labels, footprint;
                const char *leader;
                u_long t;
                int n;
 
                if (rdlen < 22)
                        goto formerr;
 
                /* Type covered, Algorithm, Label count, Original TTL. */
                type = ns_get16(rdata);  rdata += NS_INT16SZ;
                algorithm = *rdata++;
                labels = *rdata++;
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                len = SPRINTF((tmp, " %s %d %lu ",
                               p_type(type), algorithm, t));
                T(addstr(tmp, len, &buf, &buflen));
                if (labels != (u_int)dn_count_labels(name))
                        goto formerr;
 
                /* Signature expiry. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                len = SPRINTF((tmp, "%s ", p_secstodate(t)));
                T(addstr(tmp, len, &buf, &buflen));
 
                /* Time signed. */
                t = ns_get32(rdata);  rdata += NS_INT32SZ;
                len = SPRINTF((tmp, "%s ", p_secstodate(t)));
                T(addstr(tmp, len, &buf, &buflen));
 
                /* Signature Footprint. */
                footprint = ns_get16(rdata);  rdata += NS_INT16SZ;
                len = SPRINTF((tmp, "%u ", footprint));
                T(addstr(tmp, len, &buf, &buflen));
 
                /* Signer's name. */
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 
                /* Signature. */
                len = b64_ntop(rdata, edata - rdata,
                               base64_key, sizeof base64_key);
                if (len > 15) {
                        T(addstr(" (", 2, &buf, &buflen));
                        leader = "\n\t\t";
                        spaced = 0;
                } else
                        leader = " ";
                if (len < 0)
                        goto formerr;
                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));
 
                break;
            }
 
        case ns_t_nxt: {
                int n, c;
 
                /* Next domain name. */
                T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 
                /* Type bit map. */
                n = edata - rdata;
                for (c = 0; c < n*8; c++)
                        if (NS_NXT_BIT_ISSET(c, rdata)) {
                                len = SPRINTF((tmp, " %s", p_type(c)));
                                T(addstr(tmp, len, &buf, &buflen));
                        }
                break;
            }
 
        default:
                comment = "unknown RR type";
                goto hexify;
        }
        return (buf - obuf);
 formerr:
        comment = "RR format error";
 hexify: {
        int n, m;
        char *p;
 
        len = SPRINTF((tmp, "\\#(\t\t; %s", comment));
        T(addstr(tmp, len, &buf, &buflen));
        while (rdata < edata) {
                p = tmp;
                p += SPRINTF((p, "\n\t"));
                spaced = 0;
                n = MIN(16, edata - rdata);
                for (m = 0; m < n; m++)
                        p += SPRINTF((p, "%02x ", rdata[m]));
                T(addstr(tmp, p - tmp, &buf, &buflen));
                if (n < 16) {
                        T(addstr(")", 1, &buf, &buflen));
                        T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));
                }
                p = tmp;
                p += SPRINTF((p, "; "));
                for (m = 0; m < n; m++)
                        *p++ = (isascii(rdata[m]) && isprint(rdata[m]))
                                ? rdata[m]
                                : '.';
                T(addstr(tmp, p - tmp, &buf, &buflen));
                rdata += n;
        }
        return (buf - obuf);
    }
}
 
/* Private. */
 
/*
 * size_t
 * prune_origin(name, origin)
 *      Find out if the name is at or under the current origin.
 * return:
 *      Number of characters in name before start of origin,
 *      or length of name if origin does not match.
 * notes:
 *      This function should share code with samedomain().
 */
static size_t
prune_origin(const char *name, const char *origin) {
        const char *oname = name;
 
        while (*name != '\0') {
                if (origin != NULL && strcasecmp(name, origin) == 0)
                        return (name - oname - (name > oname));
                while (*name != '\0') {
                        if (*name == '\\') {
                                name++;
                                /* XXX need to handle \nnn form. */
                                if (*name == '\0')
                                        break;
                        } else if (*name == '.') {
                                name++;
                                break;
                        }
                        name++;
                }
        }
        return (name - oname);
}
 
/*
 * int
 * charstr(rdata, edata, buf, buflen)
 *      Format a <character-string> into the presentation buffer.
 * return:
 *      Number of rdata octets consumed
 *      0 for protocol format error
 *      -1 for output buffer error
 * side effects:
 *      buffer is advanced on success.
 */
static int
charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
        const u_char *odata = rdata;
        size_t save_buflen = *buflen;
        char *save_buf = *buf;
 
        if (addstr("\"", 1, buf, buflen) < 0)
                goto enospc;
        if (rdata < edata) {
                int n = *rdata;
 
                if (rdata + 1 + n <= edata) {
                        rdata++;
                        while (n-- > 0) {
                                if (strchr("\n\"\\", *rdata) != NULL)
                                        if (addstr("\\", 1, buf, buflen) < 0)
                                                goto enospc;
                                if (addstr((const char *)rdata, 1,
                                           buf, buflen) < 0)
                                        goto enospc;
                                rdata++;
                        }
                }
        }
        if (addstr("\"", 1, buf, buflen) < 0)
                goto enospc;
        return (rdata - odata);
 enospc:
        errno = ENOSPC;
        *buf = save_buf;
        *buflen = save_buflen;
        return (-1);
}
 
static int
addname(const u_char *msg, size_t msglen,
        const u_char **pp, const char *origin,
        char **buf, size_t *buflen)
{
        size_t newlen, save_buflen = *buflen;
        char *save_buf = *buf;
        int n;
 
        n = dn_expand(msg, msg + msglen, *pp, *buf, *buflen);
        if (n < 0)
                goto enospc;    /* Guess. */
        newlen = prune_origin(*buf, origin);
        if ((origin == NULL || origin[0] == '\0' || (*buf)[newlen] == '\0') &&
            (newlen == 0 || (*buf)[newlen - 1] != '.')) {
                /* No trailing dot. */
                if (newlen + 2 > *buflen)
                        goto enospc;    /* No room for ".\0". */
                (*buf)[newlen++] = '.';
                (*buf)[newlen] = '\0';
        }
        if (newlen == 0) {
                /* Use "@" instead of name. */
                if (newlen + 2 > *buflen)
                        goto enospc;        /* No room for "@\0". */
                (*buf)[newlen++] = '@';
                (*buf)[newlen] = '\0';
        }
        *pp += n;
        addlen(newlen, buf, buflen);
        **buf = '\0';
        return (newlen);
 enospc:
        errno = ENOSPC;
        *buf = save_buf;
        *buflen = save_buflen;
        return (-1);
}
 
static void
addlen(size_t len, char **buf, size_t *buflen) {
        assert(len <= *buflen);
        *buf += len;
        *buflen -= len;
}
 
static int
addstr(const char *src, size_t len, char **buf, size_t *buflen) {
        if (len > *buflen) {
                errno = ENOSPC;
                return (-1);
        }
        memcpy(*buf, src, len);
        addlen(len, buf, buflen);
        **buf = '\0';
        return (0);
}
 
static int
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) {
                T(addstr("  ", 2, buf, buflen));
                spaced = 1;
        } else {
                for (t = (target - len - 1) / 8; t >= 0; t--)
                        if (addstr("\t", 1, buf, buflen) < 0) {
                                *buflen = save_buflen;
                                *buf = save_buf;
                                return (-1);
                        }
                spaced = 0;
        }
        return (spaced);
}

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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [ns_print.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	158	chris	`/*`
2			`* Copyright (c) 1996, 1998 by Internet Software Consortium.`
3			`*`
4			`* Permission to use, copy, modify, and distribute this software for any`
5			`* purpose with or without fee is hereby granted, provided that the above`
6			`* copyright notice and this permission notice appear in all copies.`
7			`*`
8			`* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS`
9			`* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES`
10			`* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE`
11			`* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL`
12			`* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR`
13			`* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS`
14			`* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS`
15			`* SOFTWARE.`
16			`*/`
17
18			`#if !defined(__rtems__)`
19			`#if !defined(LINT) && !defined(CODECENTER)`
20	208	chris	`static char rcsid[] = "$Id: ns_print.c,v 1.2 2001-09-27 12:01:53 chris Exp $";`
21	158	chris	`#endif /* not lint */`
22			`#endif /* not rtems */`
23
24			`/* Import. */`
25
26			`#include <sys/types.h>`
27			`#include <sys/socket.h>`
28
29			`#include <netinet/in.h>`
30			`#include <arpa/nameser.h>`
31			`#include <arpa/inet.h>`
32
33			`#include <assert.h>`
34			`#include <errno.h>`
35			`#include <resolv.h>`
36			`#include <string.h>`
37			`#include <ctype.h>`
38
39			`#define SPRINTF(x) ((size_t)sprintf x)`
40
41			`/* Forward. */`
42
43			`static size_t prune_origin(const char name, const char origin);`
44			`static int charstr(const u_char rdata, const u_char edata,`
45			`char *buf, size_t buflen);`
46			`static int addname(const u_char *msg, size_t msglen,`
47			`const u_char *p, const char origin,`
48			`char *buf, size_t buflen);`
49			`static void addlen(size_t len, char *buf, size_t buflen);`
50			`static int addstr(const char *src, size_t len,`
51			`char *buf, size_t buflen);`
52			`static int addtab(size_t len, size_t target, int spaced,`
53			`char *buf, size_t buflen);`
54
55			`/* Macros. */`
56
57			`#define T(x) \`
58			`do { \`
59			`if ((x) < 0) \`
60			`return (-1); \`
61			`} while (0)`
62
63			`/* Public. */`
64
65			`/*`
66			`* int`
67			`* ns_sprintrr(handle, rr, name_ctx, origin, buf, buflen)`
68			`* Convert an RR to presentation format.`
69			`* return:`
70			`* Number of characters written to buf, or -1 (check errno).`
71			`*/`
72			`int`
73			`ns_sprintrr(const ns_msg handle, const ns_rr rr,`
74			`const char name_ctx, const char origin,`
75			`char *buf, size_t buflen)`
76			`{`
77			`int n;`
78
79			`n = ns_sprintrrf(ns_msg_base(handle), ns_msg_size(handle),`
80			`ns_rr_name(rr), ns_rr_class(rr), ns_rr_type(*rr),`
81			`ns_rr_ttl(rr), ns_rr_rdata(rr), ns_rr_rdlen(*rr),`
82			`name_ctx, origin, buf, buflen);`
83			`return (n);`
84			`}`
85
86			`/*`
87			`* int`
88			`* ns_sprintrrf(msg, msglen, name, class, type, ttl, rdata, rdlen,`
89			`* name_ctx, origin, buf, buflen)`
90			`* Convert the fields of an RR into presentation format.`
91			`* return:`
92			`* Number of characters written to buf, or -1 (check errno).`
93			`*/`
94			`int`
95			`ns_sprintrrf(const u_char *msg, size_t msglen,`
96			`const char *name, ns_class class, ns_type type,`
97			`u_long ttl, const u_char *rdata, size_t rdlen,`
98			`const char name_ctx, const char origin,`
99			`char *buf, size_t buflen)`
100			`{`
101			`const char *obuf = buf;`
102			`const u_char *edata = rdata + rdlen;`
103			`int spaced = 0;`
104
105			`const char *comment;`
106			`char tmp[100];`
107			`int len, x;`
108
109			`/*`
110			`* Owner.`
111			`*/`
112			`if (name_ctx != NULL && strcasecmp(name_ctx, name) == 0) {`
113			`T(addstr("\t\t\t", 3, &buf, &buflen));`
114			`} else {`
115			`len = prune_origin(name, origin);`
116			`if (len == 0) {`
117			`T(addstr("@\t\t\t", 4, &buf, &buflen));`
118			`} else {`
119			`T(addstr(name, len, &buf, &buflen));`
120			`/* Origin not used and no trailing dot? */`
121			`if ((!origin \|\| !origin[0] \|\| name[len] == '\0') &&`
122			`name[len - 1] != '.') {`
123			`T(addstr(".", 1, &buf, &buflen));`
124			`len++;`
125			`}`
126			`T(spaced = addtab(len, 24, spaced, &buf, &buflen));`
127			`}`
128			`}`
129
130			`/*`
131			`* TTL, Class, Type.`
132			`*/`
133			`T(x = ns_format_ttl(ttl, buf, buflen));`
134			`addlen(x, &buf, &buflen);`
135			`len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));`
136			`T(addstr(tmp, len, &buf, &buflen));`
137			`T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));`
138
139			`/*`
140			`* RData.`
141			`*/`
142			`switch (type) {`
143			`case ns_t_a:`
144			`if (rdlen != NS_INADDRSZ)`
145			`goto formerr;`
146			`(void) inet_ntop(AF_INET, rdata, buf, buflen);`
147			`addlen(strlen(buf), &buf, &buflen);`
148			`break;`
149
150			`case ns_t_cname:`
151			`case ns_t_mb:`
152			`case ns_t_mg:`
153			`case ns_t_mr:`
154			`case ns_t_ns:`
155			`case ns_t_ptr:`
156			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
157			`break;`
158
159			`case ns_t_hinfo:`
160			`case ns_t_isdn:`
161			`/* First word. */`
162			`T(len = charstr(rdata, edata, &buf, &buflen));`
163			`if (len == 0)`
164			`goto formerr;`
165			`rdata += len;`
166			`T(addstr(" ", 1, &buf, &buflen));`
167
168			`/* Second word. */`
169			`T(len = charstr(rdata, edata, &buf, &buflen));`
170			`if (len == 0)`
171			`goto formerr;`
172			`rdata += len;`
173			`break;`
174
175			`case ns_t_soa: {`
176			`u_long t;`
177
178			`/* Server name. */`
179			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
180			`T(addstr(" ", 1, &buf, &buflen));`
181
182			`/* Administrator name. */`
183			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
184			`T(addstr(" (\n", 3, &buf, &buflen));`
185			`spaced = 0;`
186
187			`if ((edata - rdata) != 5*NS_INT32SZ)`
188			`goto formerr;`
189
190			`/* Serial number. */`
191			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
192			`T(addstr("\t\t\t\t\t", 5, &buf, &buflen));`
193			`len = SPRINTF((tmp, "%lu", t));`
194			`T(addstr(tmp, len, &buf, &buflen));`
195			`T(spaced = addtab(len, 16, spaced, &buf, &buflen));`
196			`T(addstr("; serial\n", 9, &buf, &buflen));`
197			`spaced = 0;`
198
199			`/* Refresh interval. */`
200			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
201			`T(addstr("\t\t\t\t\t", 5, &buf, &buflen));`
202			`T(len = ns_format_ttl(t, buf, buflen));`
203			`addlen(len, &buf, &buflen);`
204			`T(spaced = addtab(len, 16, spaced, &buf, &buflen));`
205			`T(addstr("; refresh\n", 10, &buf, &buflen));`
206			`spaced = 0;`
207
208			`/* Retry interval. */`
209			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
210			`T(addstr("\t\t\t\t\t", 5, &buf, &buflen));`
211			`T(len = ns_format_ttl(t, buf, buflen));`
212			`addlen(len, &buf, &buflen);`
213			`T(spaced = addtab(len, 16, spaced, &buf, &buflen));`
214			`T(addstr("; retry\n", 8, &buf, &buflen));`
215			`spaced = 0;`
216
217			`/* Expiry. */`
218			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
219			`T(addstr("\t\t\t\t\t", 5, &buf, &buflen));`
220			`T(len = ns_format_ttl(t, buf, buflen));`
221			`addlen(len, &buf, &buflen);`
222			`T(spaced = addtab(len, 16, spaced, &buf, &buflen));`
223			`T(addstr("; expiry\n", 9, &buf, &buflen));`
224			`spaced = 0;`
225
226			`/* Minimum TTL. */`
227			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
228			`T(addstr("\t\t\t\t\t", 5, &buf, &buflen));`
229			`T(len = ns_format_ttl(t, buf, buflen));`
230			`addlen(len, &buf, &buflen);`
231			`T(addstr(" )", 2, &buf, &buflen));`
232			`T(spaced = addtab(len, 16, spaced, &buf, &buflen));`
233			`T(addstr("; minimum\n", 10, &buf, &buflen));`
234
235			`break;`
236			`}`
237
238			`case ns_t_mx:`
239			`case ns_t_afsdb:`
240			`case ns_t_rt: {`
241			`u_int t;`
242
243			`if (rdlen < NS_INT16SZ)`
244			`goto formerr;`
245
246			`/* Priority. */`
247			`t = ns_get16(rdata);`
248			`rdata += NS_INT16SZ;`
249			`len = SPRINTF((tmp, "%u ", t));`
250			`T(addstr(tmp, len, &buf, &buflen));`
251
252			`/* Target. */`
253			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
254
255			`break;`
256			`}`
257
258			`case ns_t_px: {`
259			`u_int t;`
260
261			`if (rdlen < NS_INT16SZ)`
262			`goto formerr;`
263
264			`/* Priority. */`
265			`t = ns_get16(rdata);`
266			`rdata += NS_INT16SZ;`
267			`len = SPRINTF((tmp, "%u ", t));`
268			`T(addstr(tmp, len, &buf, &buflen));`
269
270			`/* Name1. */`
271			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
272			`T(addstr(" ", 1, &buf, &buflen));`
273
274			`/* Name2. */`
275			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
276
277			`break;`
278			`}`
279
280			`case ns_t_x25:`
281			`T(len = charstr(rdata, edata, &buf, &buflen));`
282			`if (len == 0)`
283			`goto formerr;`
284			`rdata += len;`
285			`break;`
286
287			`case ns_t_txt:`
288			`while (rdata < edata) {`
289			`T(len = charstr(rdata, edata, &buf, &buflen));`
290			`if (len == 0)`
291			`goto formerr;`
292			`rdata += len;`
293			`if (rdata < edata)`
294			`T(addstr(" ", 1, &buf, &buflen));`
295			`}`
296			`break;`
297
298			`case ns_t_nsap: {`
299			`char t[255*3];`
300
301			`(void) inet_nsap_ntoa(rdlen, rdata, t);`
302			`T(addstr(t, strlen(t), &buf, &buflen));`
303			`break;`
304			`}`
305
306			`case ns_t_aaaa:`
307			`if (rdlen != NS_IN6ADDRSZ)`
308			`goto formerr;`
309			`(void) inet_ntop(AF_INET6, rdata, buf, buflen);`
310			`addlen(strlen(buf), &buf, &buflen);`
311			`break;`
312
313			`case ns_t_loc: {`
314			`char t[255];`
315
316			`/* XXX protocol format checking? */`
317			`(void) loc_ntoa(rdata, t);`
318			`T(addstr(t, strlen(t), &buf, &buflen));`
319			`break;`
320			`}`
321
322			`case ns_t_naptr: {`
323			`u_int order, preference;`
324			`char t[50];`
325
326			`if (rdlen < 2*NS_INT16SZ)`
327			`goto formerr;`
328
329			`/* Order, Precedence. */`
330			`order = ns_get16(rdata); rdata += NS_INT16SZ;`
331			`preference = ns_get16(rdata); rdata += NS_INT16SZ;`
332			`len = SPRINTF((t, "%u %u ", order, preference));`
333			`T(addstr(t, len, &buf, &buflen));`
334
335			`/* Flags. */`
336			`T(len = charstr(rdata, edata, &buf, &buflen));`
337			`if (len == 0)`
338			`goto formerr;`
339			`rdata += len;`
340			`T(addstr(" ", 1, &buf, &buflen));`
341
342			`/* Service. */`
343			`T(len = charstr(rdata, edata, &buf, &buflen));`
344			`if (len == 0)`
345			`goto formerr;`
346			`rdata += len;`
347			`T(addstr(" ", 1, &buf, &buflen));`
348
349			`/* Regexp. */`
350			`T(len = charstr(rdata, edata, &buf, &buflen));`
351			`if (len < 0)`
352			`return (-1);`
353			`if (len == 0)`
354			`goto formerr;`
355			`rdata += len;`
356			`T(addstr(" ", 1, &buf, &buflen));`
357
358			`/* Server. */`
359			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
360			`break;`
361			`}`
362
363			`case ns_t_srv: {`
364			`u_int priority, weight, port;`
365			`char t[50];`
366
367			`if (rdlen < NS_INT16SZ*3)`
368			`goto formerr;`
369
370			`/* Priority, Weight, Port. */`
371			`priority = ns_get16(rdata); rdata += NS_INT16SZ;`
372			`weight = ns_get16(rdata); rdata += NS_INT16SZ;`
373			`port = ns_get16(rdata); rdata += NS_INT16SZ;`
374			`len = SPRINTF((t, "%u %u %u ", priority, weight, port));`
375			`T(addstr(t, len, &buf, &buflen));`
376
377			`/* Server. */`
378			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
379			`break;`
380			`}`
381
382			`case ns_t_minfo:`
383			`case ns_t_rp:`
384			`/* Name1. */`
385			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
386			`T(addstr(" ", 1, &buf, &buflen));`
387
388			`/* Name2. */`
389			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
390
391			`break;`
392
393			`case ns_t_wks: {`
394			`int n, lcnt;`
395
396			`if (rdlen < NS_INT32SZ + 1)`
397			`goto formerr;`
398
399			`/* Address. */`
400			`(void) inet_ntop(AF_INET, rdata, buf, buflen);`
401			`addlen(strlen(buf), &buf, &buflen);`
402			`rdata += NS_INADDRSZ;`
403
404			`/* Protocol. */`
405			`len = SPRINTF((tmp, " %u ( ", *rdata));`
406			`T(addstr(tmp, len, &buf, &buflen));`
407			`rdata += NS_INT8SZ;`
408
409			`/* Bit map. */`
410			`n = 0;`
411			`lcnt = 0;`
412			`while (rdata < edata) {`
413			`u_int c = *rdata++;`
414			`do {`
415			`if (c & 0200) {`
416			`if (lcnt == 0) {`
417			`T(addstr("\n\t\t\t\t", 5,`
418			`&buf, &buflen));`
419			`lcnt = 10;`
420			`spaced = 0;`
421			`}`
422			`len = SPRINTF((tmp, "%d ", n));`
423			`T(addstr(tmp, len, &buf, &buflen));`
424			`lcnt--;`
425			`}`
426			`c <<= 1;`
427			`} while (++n & 07);`
428			`}`
429			`T(addstr(")", 1, &buf, &buflen));`
430
431			`break;`
432			`}`
433
434			`case ns_t_key: {`
435			`char base64_key[NS_MD5RSA_MAX_BASE64];`
436			`u_int keyflags, protocol, algorithm;`
437			`const char *leader;`
438			`int n;`
439
440			`if (rdlen < NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)`
441			`goto formerr;`
442
443			`/* Key flags, Protocol, Algorithm. */`
444			`keyflags = ns_get16(rdata); rdata += NS_INT16SZ;`
445			`protocol = *rdata++;`
446			`algorithm = *rdata++;`
447			`len = SPRINTF((tmp, "0x%04x %u %u",`
448			`keyflags, protocol, algorithm));`
449			`T(addstr(tmp, len, &buf, &buflen));`
450
451			`/* Public key data. */`
452			`len = b64_ntop(rdata, edata - rdata,`
453			`base64_key, sizeof base64_key);`
454			`if (len < 0)`
455			`goto formerr;`
456			`if (len > 15) {`
457			`T(addstr(" (", 2, &buf, &buflen));`
458			`leader = "\n\t\t";`
459			`spaced = 0;`
460			`} else`
461			`leader = " ";`
462			`for (n = 0; n < len; n += 48) {`
463			`T(addstr(leader, strlen(leader), &buf, &buflen));`
464			`T(addstr(base64_key + n, MIN(len - n, 48),`
465			`&buf, &buflen));`
466			`}`
467			`if (len > 15)`
468			`T(addstr(" )", 2, &buf, &buflen));`
469
470			`break;`
471			`}`
472
473			`case ns_t_sig: {`
474			`char base64_key[NS_MD5RSA_MAX_BASE64];`
475			`u_int type, algorithm, labels, footprint;`
476			`const char *leader;`
477			`u_long t;`
478			`int n;`
479
480			`if (rdlen < 22)`
481			`goto formerr;`
482
483			`/* Type covered, Algorithm, Label count, Original TTL. */`
484			`type = ns_get16(rdata); rdata += NS_INT16SZ;`
485			`algorithm = *rdata++;`
486			`labels = *rdata++;`
487			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
488			`len = SPRINTF((tmp, " %s %d %lu ",`
489			`p_type(type), algorithm, t));`
490			`T(addstr(tmp, len, &buf, &buflen));`
491			`if (labels != (u_int)dn_count_labels(name))`
492			`goto formerr;`
493
494			`/* Signature expiry. */`
495			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
496			`len = SPRINTF((tmp, "%s ", p_secstodate(t)));`
497			`T(addstr(tmp, len, &buf, &buflen));`
498
499			`/* Time signed. */`
500			`t = ns_get32(rdata); rdata += NS_INT32SZ;`
501			`len = SPRINTF((tmp, "%s ", p_secstodate(t)));`
502			`T(addstr(tmp, len, &buf, &buflen));`
503
504			`/* Signature Footprint. */`
505			`footprint = ns_get16(rdata); rdata += NS_INT16SZ;`
506			`len = SPRINTF((tmp, "%u ", footprint));`
507			`T(addstr(tmp, len, &buf, &buflen));`
508
509			`/* Signer's name. */`
510			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
511
512			`/* Signature. */`
513			`len = b64_ntop(rdata, edata - rdata,`
514			`base64_key, sizeof base64_key);`
515			`if (len > 15) {`
516			`T(addstr(" (", 2, &buf, &buflen));`
517			`leader = "\n\t\t";`
518			`spaced = 0;`
519			`} else`
520			`leader = " ";`
521			`if (len < 0)`
522			`goto formerr;`
523			`for (n = 0; n < len; n += 48) {`
524			`T(addstr(leader, strlen(leader), &buf, &buflen));`
525			`T(addstr(base64_key + n, MIN(len - n, 48),`
526			`&buf, &buflen));`
527			`}`
528			`if (len > 15)`
529			`T(addstr(" )", 2, &buf, &buflen));`
530
531			`break;`
532			`}`
533
534			`case ns_t_nxt: {`
535			`int n, c;`
536
537			`/* Next domain name. */`
538			`T(addname(msg, msglen, &rdata, origin, &buf, &buflen));`
539
540			`/* Type bit map. */`
541			`n = edata - rdata;`
542			`for (c = 0; c < n*8; c++)`
543			`if (NS_NXT_BIT_ISSET(c, rdata)) {`
544			`len = SPRINTF((tmp, " %s", p_type(c)));`
545			`T(addstr(tmp, len, &buf, &buflen));`
546			`}`
547			`break;`
548			`}`
549
550			`default:`
551			`comment = "unknown RR type";`
552			`goto hexify;`
553			`}`
554			`return (buf - obuf);`
555			`formerr:`
556			`comment = "RR format error";`
557			`hexify: {`
558			`int n, m;`
559			`char *p;`
560
561			`len = SPRINTF((tmp, "\\#(\t\t; %s", comment));`
562			`T(addstr(tmp, len, &buf, &buflen));`
563			`while (rdata < edata) {`
564			`p = tmp;`
565			`p += SPRINTF((p, "\n\t"));`
566			`spaced = 0;`
567			`n = MIN(16, edata - rdata);`
568			`for (m = 0; m < n; m++)`
569			`p += SPRINTF((p, "%02x ", rdata[m]));`
570			`T(addstr(tmp, p - tmp, &buf, &buflen));`
571			`if (n < 16) {`
572			`T(addstr(")", 1, &buf, &buflen));`
573			`T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));`
574			`}`
575			`p = tmp;`
576			`p += SPRINTF((p, "; "));`
577			`for (m = 0; m < n; m++)`
578			`*p++ = (isascii(rdata[m]) && isprint(rdata[m]))`
579			`? rdata[m]`
580			`: '.';`
581			`T(addstr(tmp, p - tmp, &buf, &buflen));`
582			`rdata += n;`
583			`}`
584			`return (buf - obuf);`
585			`}`
586			`}`
587
588			`/* Private. */`
589
590			`/*`
591			`* size_t`
592			`* prune_origin(name, origin)`
593			`* Find out if the name is at or under the current origin.`
594			`* return:`
595			`* Number of characters in name before start of origin,`
596			`* or length of name if origin does not match.`
597			`* notes:`
598			`* This function should share code with samedomain().`
599			`*/`
600			`static size_t`
601			`prune_origin(const char name, const char origin) {`
602			`const char *oname = name;`
603
604			`while (*name != '\0') {`
605			`if (origin != NULL && strcasecmp(name, origin) == 0)`
606			`return (name - oname - (name > oname));`
607			`while (*name != '\0') {`
608			`if (*name == '\\') {`
609			`name++;`
610			`/* XXX need to handle \nnn form. */`
611			`if (*name == '\0')`
612			`break;`
613			`} else if (*name == '.') {`
614			`name++;`
615			`break;`
616			`}`
617			`name++;`
618			`}`
619			`}`
620			`return (name - oname);`
621			`}`
622
623			`/*`
624			`* int`
625			`* charstr(rdata, edata, buf, buflen)`
626			`* Format a <character-string> into the presentation buffer.`
627			`* return:`
628			`* Number of rdata octets consumed`
629			`* 0 for protocol format error`
630			`* -1 for output buffer error`
631			`* side effects:`
632			`* buffer is advanced on success.`
633			`*/`
634			`static int`
635			`charstr(const u_char rdata, const u_char edata, char *buf, size_t buflen) {`
636			`const u_char *odata = rdata;`
637			`size_t save_buflen = *buflen;`
638			`char save_buf = buf;`
639
640			`if (addstr("\"", 1, buf, buflen) < 0)`
641			`goto enospc;`
642			`if (rdata < edata) {`
643			`int n = *rdata;`
644
645			`if (rdata + 1 + n <= edata) {`
646			`rdata++;`
647			`while (n-- > 0) {`
648			`if (strchr("\n\"\\", *rdata) != NULL)`
649			`if (addstr("\\", 1, buf, buflen) < 0)`
650			`goto enospc;`
651			`if (addstr((const char *)rdata, 1,`
652			`buf, buflen) < 0)`
653			`goto enospc;`
654			`rdata++;`
655			`}`
656			`}`
657			`}`
658			`if (addstr("\"", 1, buf, buflen) < 0)`
659			`goto enospc;`
660			`return (rdata - odata);`
661			`enospc:`
662			`errno = ENOSPC;`
663			`*buf = save_buf;`
664			`*buflen = save_buflen;`
665			`return (-1);`
666			`}`
667
668			`static int`
669			`addname(const u_char *msg, size_t msglen,`
670			`const u_char *pp, const char origin,`
671			`char *buf, size_t buflen)`
672			`{`
673			`size_t newlen, save_buflen = *buflen;`
674			`char save_buf = buf;`
675			`int n;`
676
677			`n = dn_expand(msg, msg + msglen, pp, buf, *buflen);`
678			`if (n < 0)`
679			`goto enospc; /* Guess. */`
680			`newlen = prune_origin(*buf, origin);`
681			`if ((origin == NULL \|\| origin[0] == '\0' \|\| (*buf)[newlen] == '\0') &&`
682			`(newlen == 0 \|\| (*buf)[newlen - 1] != '.')) {`
683			`/* No trailing dot. */`
684			`if (newlen + 2 > *buflen)`
685			`goto enospc; /* No room for ".\0". */`
686			`(*buf)[newlen++] = '.';`
687			`(*buf)[newlen] = '\0';`
688			`}`
689			`if (newlen == 0) {`
690			`/* Use "@" instead of name. */`
691			`if (newlen + 2 > *buflen)`
692			`goto enospc; /* No room for "@\0". */`
693			`(*buf)[newlen++] = '@';`
694			`(*buf)[newlen] = '\0';`
695			`}`
696			`*pp += n;`
697			`addlen(newlen, buf, buflen);`
698			`**buf = '\0';`
699			`return (newlen);`
700			`enospc:`
701			`errno = ENOSPC;`
702			`*buf = save_buf;`
703			`*buflen = save_buflen;`
704			`return (-1);`
705			`}`
706
707			`static void`
708			`addlen(size_t len, char *buf, size_t buflen) {`
709			`assert(len <= *buflen);`
710			`*buf += len;`
711			`*buflen -= len;`
712			`}`
713
714			`static int`
715			`addstr(const char src, size_t len, char buf, size_t buflen) {`
716			`if (len > *buflen) {`
717			`errno = ENOSPC;`
718			`return (-1);`
719			`}`
720			`memcpy(*buf, src, len);`
721			`addlen(len, buf, buflen);`
722			`**buf = '\0';`
723			`return (0);`
724			`}`
725
726			`static int`
727			`addtab(size_t len, size_t target, int spaced, char *buf, size_t buflen) {`
728			`size_t save_buflen = *buflen;`
729			`char save_buf = buf;`
730			`int t;`
731
732			`if (spaced \|\| len >= target - 1) {`
733			`T(addstr(" ", 2, buf, buflen));`
734			`spaced = 1;`
735			`} else {`
736			`for (t = (target - len - 1) / 8; t >= 0; t--)`
737			`if (addstr("\t", 1, buf, buflen) < 0) {`
738			`*buflen = save_buflen;`
739			`*buf = save_buf;`
740			`return (-1);`
741			`}`
742			`spaced = 0;`
743			`}`
744			`return (spaced);`
745			`}`