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Define library prefix/suffix with macros, explicitly define and enforce limit on protocol name length, and overall library name length.

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This commit is contained in:
Michael Jumper 2012-08-23 11:50:06 -07:00
parent aaa463ec9f
commit b0240f02ab
2 changed files with 37 additions and 4 deletions
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32
libguac/include/client.h
View File

@ -50,6 +50,38 @@
* @file client.h
*/
/**
* String prefix which begins the library filename of all client plugins.
*/
#define GUAC_PROTOCOL_LIBRARY_PREFIX "libguac-client-"
/**
* String suffix which ends the library filename of all client plugins.
*/
#define GUAC_PROTOCOL_LIBRARY_SUFFIX ".so"
/**
* The maximum number of characters (COUNTING NULL TERMINATOR) to allow
* for protocol names within the library filename of client plugins.
*/
#define GUAC_PROTOCOL_NAME_LIMIT 256
/**
* The maximum number of characters (INCLUDING NULL TERMINATOR) that a
* character array containing the concatenation of the library prefix,
* protocol name, and suffix can contain, assuming the protocol name is
* limited to GUAC_PROTOCOL_NAME_LIMIT characters.
*/
#define GUAC_PROTOCOL_LIBRARY_LIMIT ( \
\
sizeof(GUAC_PROTOCOL_LIBRARY_PREFIX) - 1 /* "libguac-client-" */ \
+ GUAC_PROTOCOL_NAME_LIMIT - 1 /* [up to 256 chars] */ \
+ sizeof(GUAC_PROTOCOL_LIBRARY_SUFFIX) - 1 /* ".so" */ \
+ 1 /* NULL terminator */ \
\
)
typedef struct guac_client guac_client;
typedef struct guac_client_plugin guac_client_plugin;

9
libguac/src/client.c
View File

@ -164,16 +164,17 @@ guac_client_plugin* guac_client_plugin_open(const char* protocol) {
const char** client_args;
/* Pluggable client */
char protocol_lib[256] = "libguac-client-";
char protocol_lib[GUAC_PROTOCOL_LIBRARY_LIMIT] =
GUAC_PROTOCOL_LIBRARY_PREFIX;
union {
guac_client_init_handler* client_init;
void* obj;
} alias;
/* Add protocol and .so suffix to protocol_lib */
strcat(protocol_lib, protocol);
strcat(protocol_lib, ".so");
strncat(protocol_lib, protocol, GUAC_PROTOCOL_NAME_LIMIT-1);
strcat(protocol_lib, GUAC_PROTOCOL_LIBRARY_SUFFIX);
/* Load client plugin */
client_plugin_handle = dlopen(protocol_lib, RTLD_LAZY);