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Add buf_decrpos()

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This commit is contained in:
Matt Johnston 2020-10-24 18:56:45 +08:00
parent 1a208c460b
commit 037d26f055
5 changed files with 17 additions and 11 deletions
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17
buffer.c
View File

@ -125,18 +125,23 @@ void buf_incrwritepos(buffer* buf, unsigned int incr) {
} }
} }
/* increment the position by incr, negative values are allowed, to /* increment the position by incr */
* decrement the pos*/ void buf_incrpos(buffer* buf, unsigned int incr) {
void buf_incrpos(buffer* buf, int incr) {
if (incr > BUF_MAX_INCR if (incr > BUF_MAX_INCR
|| incr < -BUF_MAX_INCR || (buf->pos + incr) > buf->len) {
|| (unsigned int)((int)buf->pos + incr) > buf->len
|| ((int)buf->pos + incr) < 0) {
dropbear_exit("Bad buf_incrpos"); dropbear_exit("Bad buf_incrpos");
} }
buf->pos += incr; buf->pos += incr;
} }
/* decrement the position by decr */
void buf_decrpos(buffer* buf, unsigned int decr) {
if (decr > buf->pos) {
dropbear_exit("Bad buf_decrpos");
}
buf->pos -= decr;
}
/* Get a byte from the buffer and increment the pos */ /* Get a byte from the buffer and increment the pos */
unsigned char buf_getbyte(buffer* buf) { unsigned char buf_getbyte(buffer* buf) {

3
buffer.h
View File

@ -49,7 +49,8 @@ buffer* buf_newcopy(const buffer* buf);
void buf_setlen(buffer* buf, unsigned int len); void buf_setlen(buffer* buf, unsigned int len);
void buf_incrlen(buffer* buf, unsigned int incr); void buf_incrlen(buffer* buf, unsigned int incr);
void buf_setpos(buffer* buf, unsigned int pos); void buf_setpos(buffer* buf, unsigned int pos);
void buf_incrpos(buffer* buf, int incr); /* -ve is ok, to go backwards */ void buf_incrpos(buffer* buf, unsigned int incr);
void buf_decrpos(buffer* buf, unsigned int decr);
void buf_incrwritepos(buffer* buf, unsigned int incr); void buf_incrwritepos(buffer* buf, unsigned int incr);
unsigned char buf_getbyte(buffer* buf); unsigned char buf_getbyte(buffer* buf);
unsigned char buf_getbool(buffer* buf); unsigned char buf_getbool(buffer* buf);

2
keyimport.c
View File

@ -637,7 +637,7 @@ static sign_key *openssh_read(const char *filename, const char * UNUSED(passphra
buf_incrpos(blobbuf, 8); buf_incrpos(blobbuf, 8);
buf_eatstring(blobbuf); buf_eatstring(blobbuf);
buf_eatstring(blobbuf); buf_eatstring(blobbuf);
buf_incrpos(blobbuf, -SSH_SIGNKEY_ED25519_LEN-4); buf_decrpos(blobbuf, SSH_SIGNKEY_ED25519_LEN+4);
if (buf_get_ed25519_priv_key(blobbuf, retkey->ed25519key) if (buf_get_ed25519_priv_key(blobbuf, retkey->ed25519key)
== DROPBEAR_SUCCESS) { == DROPBEAR_SUCCESS) {
errmsg = NULL; errmsg = NULL;

4
signkey.c
View File

@ -235,7 +235,7 @@ int buf_get_pub_key(buffer *buf, sign_key *key, enum signkey_type *type) {
*type = keytype; *type = keytype;
/* Rewind the buffer back before "ssh-rsa" etc */ /* Rewind the buffer back before "ssh-rsa" etc */
buf_incrpos(buf, -len - 4); buf_decrpos(buf, len + 4);
#if DROPBEAR_DSS #if DROPBEAR_DSS
if (keytype == DROPBEAR_SIGNKEY_DSS) { if (keytype == DROPBEAR_SIGNKEY_DSS) {
@ -316,7 +316,7 @@ int buf_get_priv_key(buffer *buf, sign_key *key, enum signkey_type *type) {
*type = keytype; *type = keytype;
/* Rewind the buffer back before "ssh-rsa" etc */ /* Rewind the buffer back before "ssh-rsa" etc */
buf_incrpos(buf, -len - 4); buf_decrpos(buf, len + 4);
#if DROPBEAR_DSS #if DROPBEAR_DSS
if (keytype == DROPBEAR_SIGNKEY_DSS) { if (keytype == DROPBEAR_SIGNKEY_DSS) {

2
svr-authpubkey.c
View File

@ -294,7 +294,7 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
is_comment = 1; is_comment = 1;
break; break;
} }
buf_incrpos(line, -1); buf_decrpos(line, 1);
break; break;
} }
if (is_comment) { if (is_comment) {