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Diffstat (limited to 'keyexchange/isakmpd-20041012/field.c')
| -rw-r--r-- | keyexchange/isakmpd-20041012/field.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/keyexchange/isakmpd-20041012/field.c b/keyexchange/isakmpd-20041012/field.c new file mode 100644 index 0000000..0cc96d2 --- /dev/null +++ b/keyexchange/isakmpd-20041012/field.c @@ -0,0 +1,252 @@ +/* $OpenBSD: field.c,v 1.16 2004/06/14 09:55:41 ho Exp $ */ +/* $EOM: field.c,v 1.11 2000/02/20 19:58:37 niklas Exp $ */ + +/* + * Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * This code was written under funding by Ericsson Radio Systems. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "sysdep.h" + +#include "constants.h" +#include "field.h" +#include "log.h" +#include "util.h" + +static char *field_debug_raw(u_int8_t *, size_t, struct constant_map **); +static char *field_debug_num(u_int8_t *, size_t, struct constant_map **); +static char *field_debug_mask(u_int8_t *, size_t, struct constant_map **); +static char *field_debug_ign(u_int8_t *, size_t, struct constant_map **); +static char *field_debug_cst(u_int8_t *, size_t, struct constant_map **); + +/* Contents must match the enum in struct field. */ +static char *(*decode_field[]) (u_int8_t *, size_t, + struct constant_map **) = { + field_debug_raw, + field_debug_num, + field_debug_mask, + field_debug_ign, + field_debug_cst +}; + +/* + * Return a string showing the hexadecimal contents of the LEN-sized buffer + * BUF. MAPS should be zero and is only here because the API requires it. + */ +static char * +field_debug_raw(u_int8_t *buf, size_t len, struct constant_map **maps) +{ + char *retval, *p; + + if (len == 0) + return 0; + retval = malloc(3 + len * 2); + if (!retval) + return 0; + strlcpy(retval, "0x", 3 + len * 2); + p = retval + 2; + for (; len > 0; len--) { + snprintf(p, 1 + len * 2, "%02x", *buf++); + p += 2; + } + return retval; +} + +/* + * Convert the unsigned LEN-sized number at BUF of network byteorder to a + * 32-bit unsigned integer of host byteorder pointed to by VAL. + */ +static int +extract_val(u_int8_t *buf, size_t len, u_int32_t *val) +{ + switch (len) { + case 1: + *val = *buf; + break; + case 2: + *val = decode_16(buf); + break; + case 4: + *val = decode_32(buf); + break; + default: + return -1; + } + return 0; +} + +/* + * Return a textual representation of the unsigned number pointed to by BUF + * which is LEN octets long. MAPS should be zero and is only here because + * the API requires it. + */ +static char * +field_debug_num(u_int8_t *buf, size_t len, struct constant_map **maps) +{ + char *retval; + u_int32_t val; + + if (extract_val(buf, len, &val)) + return 0; + /* 3 decimal digits are enough to represent each byte. */ + retval = malloc(3 * len); + snprintf(retval, 3 * len, "%u", val); + return retval; +} + +/* + * Return the symbolic names of the flags pointed to by BUF which is LEN + * octets long, using the constant maps MAPS. + */ +static char * +field_debug_mask(u_int8_t *buf, size_t len, struct constant_map **maps) +{ + u_int32_t val; + u_int32_t bit; + char *retval, *new_buf, *name; + size_t buf_sz; + + if (extract_val(buf, len, &val)) + return 0; + + /* Size for brackets, two spaces and a NUL terminator. */ + buf_sz = 4; + retval = malloc(buf_sz); + if (!retval) + return 0; + + strlcpy(retval, "[ ", buf_sz); + for (bit = 1; bit; bit <<= 1) { + if (val & bit) { + name = constant_name_maps(maps, bit); + buf_sz += strlen(name) + 1; + new_buf = realloc(retval, buf_sz); + if (!new_buf) { + free(retval); + return 0; + } + retval = new_buf; + strlcat(retval, name, buf_sz); + strlcat(retval, " ", buf_sz); + } + } + strlcat(retval, "]", buf_sz); + return retval; +} + +/* + * Just a dummy needed to skip the unused LEN sized space at BUF. MAPS + * should be zero and is only here because the API requires it. + */ +static char * +field_debug_ign(u_int8_t *buf, size_t len, struct constant_map **maps) +{ + return 0; +} + +/* + * Return the symbolic name of a constant pointed to by BUF which is LEN + * octets long, using the constant maps MAPS. + */ +static char * +field_debug_cst(u_int8_t *buf, size_t len, struct constant_map **maps) +{ + u_int32_t val; + + if (extract_val(buf, len, &val)) + return 0; + + return strdup(constant_name_maps(maps, val)); +} + +/* Pretty-print a field from BUF as described by F. */ +void +field_dump_field(struct field *f, u_int8_t *buf) +{ + char *value; + + value = decode_field[(int) f->type] (buf + f->offset, f->len, f->maps); + if (value) { + LOG_DBG((LOG_MESSAGE, 70, "%s: %s", f->name, value)); + free(value); + } +} + +/* Pretty-print all the fields of BUF as described in FIELDS. */ +void +field_dump_payload(struct field *fields, u_int8_t *buf) +{ + struct field *field; + + for (field = fields; field->name; field++) + field_dump_field(field, buf); +} + +/* Return the numeric value of the field F of BUF. */ +u_int32_t +field_get_num(struct field *f, u_int8_t *buf) +{ + u_int32_t val; + + if (extract_val(buf + f->offset, f->len, &val)) + return 0; + return val; +} + +/* Stash the number VAL into BUF's field F. */ +void +field_set_num(struct field *f, u_int8_t *buf, u_int32_t val) +{ + switch (f->len) { + case 1: + buf[f->offset] = val; + break; + case 2: + encode_16(buf + f->offset, val); + break; + case 4: + encode_32(buf + f->offset, val); + break; + } +} + +/* Stash BUF's raw field F into VAL. */ +void +field_get_raw(struct field *f, u_int8_t *buf, u_int8_t *val) +{ + memcpy(val, buf + f->offset, f->len); +} + +/* Stash the buffer VAL into BUF's field F. */ +void +field_set_raw(struct field *f, u_int8_t *buf, u_int8_t *val) +{ + memcpy(buf + f->offset, val, f->len); +} |