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buffer: add a hidden canary to detect format errors

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Reviewed-by: Andreas Schneider <asn@samba.org>
This commit is contained in:
Aris Adamantiadis
2014-04-22 23:00:06 +02:00
committed by Andreas Schneider
parent 7bd62dd652
commit 3b4b0f01ec
2 changed files with 23 additions and 5 deletions
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9
include/libssh/buffer.h
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@@ -38,6 +38,8 @@ struct ssh_buffer_struct {
uint32_t pos;
};
#define SSH_BUFFER_PACK_END ((uint32_t) 0x4f65feb3)
LIBSSH_API void ssh_buffer_free(ssh_buffer buffer);
LIBSSH_API void *ssh_buffer_get_begin(ssh_buffer buffer);
LIBSSH_API uint32_t ssh_buffer_get_len(ssh_buffer buffer);
@@ -49,9 +51,12 @@ int buffer_add_u32(ssh_buffer buffer, uint32_t data);
int buffer_add_u64(ssh_buffer buffer, uint64_t data);
int ssh_buffer_add_data(ssh_buffer buffer, const void *data, uint32_t len);
int ssh_buffer_pack_va(struct ssh_buffer_struct *buffer, const char *format, va_list ap);
int ssh_buffer_pack(struct ssh_buffer_struct *buffer, const char *format, ...);
int _ssh_buffer_pack(struct ssh_buffer_struct *buffer, const char *format, ...);
#define ssh_buffer_pack(buffer, format, ...) _ssh_buffer_pack((buffer),(format), __VA_ARGS__, SSH_BUFFER_PACK_END)
int ssh_buffer_unpack_va(struct ssh_buffer_struct *buffer, const char *format, va_list ap);
int ssh_buffer_unpack(struct ssh_buffer_struct *buffer, const char *format, ...);
int _ssh_buffer_unpack(struct ssh_buffer_struct *buffer, const char *format, ...);
#define ssh_buffer_unpack(buffer, format, ...) _ssh_buffer_unpack((buffer),(format), __VA_ARGS__, SSH_BUFFER_PACK_END)
int buffer_prepend_data(ssh_buffer buffer, const void *data, uint32_t len);
int buffer_add_buffer(ssh_buffer buffer, ssh_buffer source);
int ssh_buffer_reinit(ssh_buffer buffer);