=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/Attic/bufaux.c,v retrieving revision 1.29.2.1 retrieving revision 1.47 diff -u -r1.29.2.1 -r1.47 --- src/usr.bin/ssh/Attic/bufaux.c 2004/02/28 03:51:32 1.29.2.1 +++ src/usr.bin/ssh/Attic/bufaux.c 2010/01/12 01:36:08 1.47 @@ -1,3 +1,4 @@ +/* $OpenBSD: bufaux.c,v 1.47 2010/01/12 01:36:08 djm Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -36,143 +37,86 @@ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ -#include "includes.h" -RCSID("$OpenBSD: bufaux.c,v 1.29.2.1 2004/02/28 03:51:32 brad Exp $"); +#include #include -#include "bufaux.h" + +#include +#include + #include "xmalloc.h" -#include "getput.h" +#include "buffer.h" #include "log.h" +#include "misc.h" /* - * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed - * by (bits+7)/8 bytes of binary data, msb first. + * Returns integers from the buffer (msb first). */ -void -buffer_put_bignum(Buffer *buffer, const BIGNUM *value) -{ - int bits = BN_num_bits(value); - int bin_size = (bits + 7) / 8; - u_char *buf = xmalloc(bin_size); - int oi; - char msg[2]; - /* Get the value of in binary */ - oi = BN_bn2bin(value, buf); - if (oi != bin_size) - fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d", - oi, bin_size); - - /* Store the number of bits in the buffer in two bytes, msb first. */ - PUT_16BIT(msg, bits); - buffer_append(buffer, msg, 2); - /* Store the binary data. */ - buffer_append(buffer, (char *)buf, oi); - - memset(buf, 0, bin_size); - xfree(buf); -} - -/* - * Retrieves an BIGNUM from the buffer. - */ -void -buffer_get_bignum(Buffer *buffer, BIGNUM *value) +int +buffer_get_short_ret(u_short *ret, Buffer *buffer) { - u_int bits, bytes; - u_char buf[2], *bin; + u_char buf[2]; - /* Get the number for bits. */ - buffer_get(buffer, (char *) buf, 2); - bits = GET_16BIT(buf); - /* Compute the number of binary bytes that follow. */ - bytes = (bits + 7) / 8; - if (bytes > 8 * 1024) - fatal("buffer_get_bignum: cannot handle BN of size %d", bytes); - if (buffer_len(buffer) < bytes) - fatal("buffer_get_bignum: input buffer too small"); - bin = buffer_ptr(buffer); - BN_bin2bn(bin, bytes, value); - buffer_consume(buffer, bytes); + if (buffer_get_ret(buffer, (char *) buf, 2) == -1) + return (-1); + *ret = get_u16(buf); + return (0); } -/* - * Stores an BIGNUM in the buffer in SSH2 format. - */ -void -buffer_put_bignum2(Buffer *buffer, const BIGNUM *value) +u_short +buffer_get_short(Buffer *buffer) { - u_int bytes; - u_char *buf; - int oi; - u_int hasnohigh = 0; + u_short ret; - if (BN_is_zero(value)) { - buffer_put_int(buffer, 0); - return; - } - if (value->neg) - fatal("buffer_put_bignum2: negative numbers not supported"); - bytes = BN_num_bytes(value) + 1; /* extra padding byte */ - if (bytes < 2) - fatal("buffer_put_bignum2: BN too small"); - buf = xmalloc(bytes); - buf[0] = '\0'; - /* Get the value of in binary */ - oi = BN_bn2bin(value, buf+1); - if (oi != bytes-1) - fatal("buffer_put_bignum2: BN_bn2bin() failed: " - "oi %d != bin_size %d", oi, bytes); - hasnohigh = (buf[1] & 0x80) ? 0 : 1; - buffer_put_string(buffer, buf+hasnohigh, bytes-hasnohigh); - memset(buf, 0, bytes); - xfree(buf); + if (buffer_get_short_ret(&ret, buffer) == -1) + fatal("buffer_get_short: buffer error"); + + return (ret); } -void -buffer_get_bignum2(Buffer *buffer, BIGNUM *value) +int +buffer_get_int_ret(u_int *ret, Buffer *buffer) { - u_int len; - u_char *bin = buffer_get_string(buffer, &len); + u_char buf[4]; - if (len > 0 && (bin[0] & 0x80)) - fatal("buffer_get_bignum2: negative numbers not supported"); - if (len > 8 * 1024) - fatal("buffer_get_bignum2: cannot handle BN of size %d", len); - BN_bin2bn(bin, len, value); - xfree(bin); + if (buffer_get_ret(buffer, (char *) buf, 4) == -1) + return (-1); + *ret = get_u32(buf); + return (0); } -/* - * Returns integers from the buffer (msb first). - */ - -u_short -buffer_get_short(Buffer *buffer) +u_int +buffer_get_int(Buffer *buffer) { - u_char buf[2]; + u_int ret; - buffer_get(buffer, (char *) buf, 2); - return GET_16BIT(buf); + if (buffer_get_int_ret(&ret, buffer) == -1) + fatal("buffer_get_int: buffer error"); + + return (ret); } -u_int -buffer_get_int(Buffer *buffer) +int +buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer) { - u_char buf[4]; + u_char buf[8]; - buffer_get(buffer, (char *) buf, 4); - return GET_32BIT(buf); + if (buffer_get_ret(buffer, (char *) buf, 8) == -1) + return (-1); + *ret = get_u64(buf); + return (0); } u_int64_t buffer_get_int64(Buffer *buffer) { - u_char buf[8]; + u_int64_t ret; - buffer_get(buffer, (char *) buf, 8); - return GET_64BIT(buf); + if (buffer_get_int64_ret(&ret, buffer) == -1) + fatal("buffer_get_int: buffer error"); + + return (ret); } /* @@ -183,7 +127,7 @@ { char buf[2]; - PUT_16BIT(buf, value); + put_u16(buf, value); buffer_append(buffer, buf, 2); } @@ -192,7 +136,7 @@ { char buf[4]; - PUT_32BIT(buf, value); + put_u32(buf, value); buffer_append(buffer, buf, 4); } @@ -201,7 +145,7 @@ { char buf[8]; - PUT_64BIT(buf, value); + put_u64(buf, value); buffer_append(buffer, buf, 8); } @@ -214,27 +158,72 @@ * to the returned string, and is not counted in length. */ void * -buffer_get_string(Buffer *buffer, u_int *length_ptr) +buffer_get_string_ret(Buffer *buffer, u_int *length_ptr) { u_char *value; u_int len; /* Get the length. */ len = buffer_get_int(buffer); - if (len > 256 * 1024) - fatal("buffer_get_string: bad string length %u", len); + if (len > 256 * 1024) { + error("buffer_get_string_ret: bad string length %u", len); + return (NULL); + } /* Allocate space for the string. Add one byte for a null character. */ value = xmalloc(len + 1); /* Get the string. */ - buffer_get(buffer, value, len); + if (buffer_get_ret(buffer, value, len) == -1) { + error("buffer_get_string_ret: buffer_get failed"); + xfree(value); + return (NULL); + } /* Append a null character to make processing easier. */ - value[len] = 0; + value[len] = '\0'; /* Optionally return the length of the string. */ if (length_ptr) *length_ptr = len; - return value; + return (value); } +void * +buffer_get_string(Buffer *buffer, u_int *length_ptr) +{ + void *ret; + + if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL) + fatal("buffer_get_string: buffer error"); + return (ret); +} + +void * +buffer_get_string_ptr_ret(Buffer *buffer, u_int *length_ptr) +{ + void *ptr; + u_int len; + + if (buffer_get_int_ret(&len, buffer) != 0) + return NULL; + if (len > 256 * 1024) { + error("buffer_get_string_ptr: bad string length %u", len); + return NULL; + } + ptr = buffer_ptr(buffer); + buffer_consume(buffer, len); + if (length_ptr) + *length_ptr = len; + return (ptr); +} + +void * +buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr) +{ + void *ret; + + if ((ret = buffer_get_string_ptr_ret(buffer, length_ptr)) == NULL) + fatal("buffer_get_string_ptr: buffer error"); + return (ret); +} + /* * Stores and arbitrary binary string in the buffer. */ @@ -256,11 +245,22 @@ * Returns a character from the buffer (0 - 255). */ int +buffer_get_char_ret(char *ret, Buffer *buffer) +{ + if (buffer_get_ret(buffer, ret, 1) == -1) { + error("buffer_get_char_ret: buffer_get_ret failed"); + return (-1); + } + return (0); +} + +int buffer_get_char(Buffer *buffer) { char ch; - buffer_get(buffer, &ch, 1); + if (buffer_get_char_ret(&ch, buffer) == -1) + fatal("buffer_get_char: buffer error"); return (u_char) ch; }