/**
* Parse /proc/%d/cmdline file
* @param filepath Path to file ~ use preallocated buffer for the path
* @param buffer output buffer with non-zero size
* @return ps-like command info or NULL
*/
static inline bool get_process_cmdline(const char* filepath, struct oscap_buffer* const buffer){
int fd = open(filepath, O_RDONLY, 0);
if (fd < 0) {
return false;
}
oscap_buffer_clear(buffer);
for(;;) {
static const int chunk_size = 1024;
char chunk[chunk_size];
// Read data, store to buffer
ssize_t read_size = read(fd, chunk, chunk_size );
if (read_size < 0) {
close(fd);
return false;
}
oscap_buffer_append_binary_data(buffer, chunk, read_size);
// If reach end of file, then end the loop
if (chunk_size != read_size) {
break;
}
}
close(fd);
int length = oscap_buffer_get_length(buffer);
char* buffer_mem = oscap_buffer_get_raw(buffer);
if ( length == 0 ) { // empty file
return false;
} else {
// Skip multiple trailing zeros
int i = length - 1;
while ( (i > 0) && (buffer_mem[i] == '\0') ) {
--i;
}
// Program and args are separated by '\0'
// Replace them with spaces ' '
while( i >= 0 ){
char chr = buffer_mem[i];
if ( ( chr == '\0') || ( chr == '\n' ) ) {
buffer_mem[i] = ' ';
} else if ( !isprint(chr) ) { // "ps" replace non-printable characters with '.' (LC_ALL=C)
buffer_mem[i] = '.';
}
--i;
}
}
return true;
}
int test_buffer_clear()
{
struct oscap_buffer *s = oscap_buffer_new();
ASSERT_LENGTH(s, 0);
oscap_buffer_clear(s);
ASSERT_LENGTH(s, 0);
char data = 'A';
oscap_buffer_append_binary_data(s, &data, 1);
ASSERT_LENGTH(s, 1);
oscap_buffer_clear(s);
ASSERT_LENGTH(s, 0);
oscap_buffer_free(s);
return 0;
}
