/* $NetBSD: support.c,v 1.2 2014/10/18 08:33:23 snj Exp $ */ /* * Portions Copyright (c) 1995-1998 by Trusted Information Systems, Inc. * * 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 TRUSTED INFORMATION SYSTEMS * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * TRUSTED INFORMATION SYSTEMS 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 THE SOFTWARE. */ #include <sys/cdefs.h> #if 0 static const char rcsid[] = "Header: /proj/cvs/prod/libbind/dst/support.c,v 1.6 2005/10/11 00:10:13 marka Exp "; #endif #include "port_before.h" #include <stdio.h> #include <unistd.h> #include <memory.h> #include <string.h> #include <errno.h> #include <sys/stat.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <resolv.h> #include "dst_internal.h" #include "port_after.h" /*% * dst_s_verify_str() * Validate that the input string(*str) is at the head of the input * buffer(**buf). If so, move the buffer head pointer (*buf) to * the first byte of data following the string(*str). * Parameters * buf Input buffer. * str Input string. * Return * 0 *str is not the head of **buff * 1 *str is the head of **buff, *buf is is advanced to * the tail of **buf. */ int dst_s_verify_str(const char **buf, const char *str) { size_t b, s; if (*buf == NULL) /*%< error checks */ return (0); if (str == NULL || *str == '\0') return (1); b = strlen(*buf); /*%< get length of strings */ s = strlen(str); if (s > b || strncmp(*buf, str, s)) /*%< check if same */ return (0); /*%< not a match */ (*buf) += s; /*%< advance pointer */ return (1); } /*% * dst_s_calculate_bits * Given a binary number represented in a u_char[], determine * the number of significant bits used. * Parameters * str An input character string containing a binary number. * max_bits The maximum possible significant bits. * Return * N The number of significant bits in str. */ int dst_s_calculate_bits(const u_char *str, const int max_bits) { const u_char *p = str; u_char i, j = 0x80; int bits; for (bits = max_bits; *p == 0x00 && bits > 0; p++) bits -= 8; for (i = *p; (i & j) != j; j >>= 1) bits--; return (bits); } /*% * calculates a checksum used in dst for an id. * takes an array of bytes and a length. * returns a 16 bit checksum. */ u_int16_t dst_s_id_calc(const u_char *key, const int keysize) { u_int32_t ac; const u_char *kp = key; int size = keysize; if (!key || (keysize <= 0)) return (0xffffU); for (ac = 0; size > 1; size -= 2, kp += 2) ac += ((*kp) << 8) + *(kp + 1); if (size > 0) ac += ((*kp) << 8); ac += (ac >> 16) & 0xffff; return (ac & 0xffff); } /*% * dst_s_dns_key_id() Function to calculate DNSSEC footprint from KEY record * rdata * Input: * dns_key_rdata: the raw data in wire format * rdata_len: the size of the input data * Output: * the key footprint/id calculated from the key data */ u_int16_t dst_s_dns_key_id(const u_char *dns_key_rdata, const int rdata_len) { if (!dns_key_rdata) return 0; /* compute id */ if (dns_key_rdata[3] == KEY_RSA) /*%< Algorithm RSA */ return dst_s_get_int16((const u_char *) &dns_key_rdata[rdata_len - 3]); else if (dns_key_rdata[3] == KEY_HMAC_MD5) /* compatibility */ return 0; else /* compute a checksum on the key part of the key rr */ return dst_s_id_calc(dns_key_rdata, rdata_len); } /*% * dst_s_get_int16 * This routine extracts a 16 bit integer from a two byte character * string. The character string is assumed to be in network byte * order and may be unaligned. The number returned is in host order. * Parameter * buf A two byte character string. * Return * The converted integer value. */ u_int16_t dst_s_get_int16(const u_char *buf) { register u_int16_t a = 0; a = ((u_int16_t)(buf[0] << 8)) | ((u_int16_t)(buf[1])); return (a); } /*% * dst_s_get_int32 * This routine extracts a 32 bit integer from a four byte character * string. The character string is assumed to be in network byte * order and may be unaligned. The number returned is in host order. * Parameter * buf A four byte character string. * Return * The converted integer value. */ u_int32_t dst_s_get_int32(const u_char *buf) { register u_int32_t a = 0; a = ((u_int32_t)(buf[0] << 24)) | ((u_int32_t)(buf[1] << 16)) | ((u_int32_t)(buf[2] << 8)) | ((u_int32_t)(buf[3])); return (a); } /*% * dst_s_put_int16 * Take a 16 bit integer and store the value in a two byte * character string. The integer is assumed to be in network * order and the string is returned in host order. * * Parameters * buf Storage for a two byte character string. * val 16 bit integer. */ void dst_s_put_int16(u_int8_t *buf, const u_int16_t val) { buf[0] = (u_int8_t)((uint32_t)val >> 8); buf[1] = (u_int8_t)(val); } /*% * dst_s_put_int32 * Take a 32 bit integer and store the value in a four byte * character string. The integer is assumed to be in network * order and the string is returned in host order. * * Parameters * buf Storage for a four byte character string. * val 32 bit integer. */ void dst_s_put_int32(u_int8_t *buf, const u_int32_t val) { buf[0] = (u_int8_t)(val >> 24); buf[1] = (u_int8_t)(val >> 16); buf[2] = (u_int8_t)(val >> 8); buf[3] = (u_int8_t)(val); } /*% * dst_s_filename_length * * This function returns the number of bytes needed to hold the * filename for a key file. '/', '\' and ':' are not allowed. * form: K<keyname>+<alg>+<id>.<suffix> * * Returns 0 if the filename would contain either '\', '/' or ':' */ size_t dst_s_filename_length(const char *name, const char *suffix) { if (name == NULL) return (0); if (strrchr(name, '\\')) return (0); if (strrchr(name, '/')) return (0); if (strrchr(name, ':')) return (0); if (suffix == NULL) return (0); if (strrchr(suffix, '\\')) return (0); if (strrchr(suffix, '/')) return (0); if (strrchr(suffix, ':')) return (0); return (1 + strlen(name) + 6 + strlen(suffix)); } /*% * dst_s_build_filename () * Builds a key filename from the key name, its id, and a * suffix. '\', '/' and ':' are not allowed. fA filename is of the * form: K<keyname><id>.<suffix> * form: K<keyname>+<alg>+<id>.<suffix> * * Returns -1 if the conversion fails: * if the filename would be too long for space allotted * if the filename would contain a '\', '/' or ':' * Returns 0 on success */ int dst_s_build_filename(char *filename, const char *name, u_int16_t id, int alg, const char *suffix, size_t filename_length) { u_int32_t my_id; if (filename == NULL) return (-1); memset(filename, 0, filename_length); if (name == NULL) return (-1); if (suffix == NULL) return (-1); if (filename_length < 1 + strlen(name) + 4 + 6 + 1 + strlen(suffix)) return (-1); my_id = id; sprintf(filename, "K%s+%03d+%05d.%s", name, alg, my_id, (const char *) suffix); if (strrchr(filename, '/')) return (-1); if (strrchr(filename, '\\')) return (-1); if (strrchr(filename, ':')) return (-1); return (0); } /*% * dst_s_fopen () * Open a file in the dst_path directory. If perm is specified, the * file is checked for existence first, and not opened if it exists. * Parameters * filename File to open * mode Mode to open the file (passed directly to fopen) * perm File permission, if creating a new file. * Returns * NULL Failure * NON-NULL (FILE *) of opened file. */ FILE * dst_s_fopen(const char *filename, const char *mode, int perm) { FILE *fp; char pathname[PATH_MAX]; if (strlen(filename) + strlen(dst_path) >= sizeof(pathname)) return (NULL); if (*dst_path != '\0') { strcpy(pathname, dst_path); strcat(pathname, filename); } else strcpy(pathname, filename); fp = fopen(pathname, mode); if (perm) chmod(pathname, (mode_t)perm); return (fp); } void dst_s_dump(const int mode, const u_char *data, const int size, const char *msg) { UNUSED(data); if (size > 0) { #ifdef LONG_TEST static u_char scratch[1000]; int n ; n = b64_ntop(data, scratch, size, sizeof(scratch)); printf("%s: %x %d %s\n", msg, mode, n, scratch); #else printf("%s,%x %d\n", msg, mode, size); #endif } } /*! \file */
