/* Given a pointer to some noise, and a desired length, open up the
* random_seed_file and get between 16 bytes and the desired length from
* said file, putting the entropy in the noise pointer */
void get_entropy_from_seedfile(uint8_t *noise,int len) {
char *filename = 0;
int zap = 0;
int seed = -1;
if(key_s[DWM_S_random_seed_file] == 0) {
filename = "/dev/urandom"; /* Default filename */
} else {
filename = (char *)dw_to_cstr(key_s[DWM_S_random_seed_file]);
zap = 1;
}
seed = open(filename, O_RDONLY);
if(seed == -1) {
dw_log_3strings("Fatal error opening random seed file ",
filename,"",1);
exit(1);
}
if(read(seed,(void *)noise,len) < 16) {
dw_log_3strings("Unable to get 128 bits of entropy; file ",
filename,
" must be\n at least 16 bytes (128 bits) long",1);
exit(1);
}
if(zap == 1) {
free(filename);
filename = 0;
}
close(seed);
}
/* This function converts a dw_str object in to a null-terminated
* C-string with the last item in the comma-separated list in the
* dw_str, with any leading whitespace in the last item removed */
char *pop_last_item(dw_str *list) {
dw_str *a = 0, *b = 0;
char *ret = 0;
a = dw_qspop(list);
if(a == 0) {
goto catch_pop_last_item;
}
b = dw_zap_lws(a);
if(b == 0) {
goto catch_pop_last_item;
}
ret = (char *)dw_to_cstr(b);
catch_pop_last_item:
if(a != 0) {
dw_destroy(a);
a = 0;
}
if(b != 0) {
dw_destroy(b);
b = 0;
}
return ret;
}
/* Process a signal received */
void process_signal(int number) {
dw_str *filename = 0;
char *fname_convert = 0;
#ifndef MINGW
/* Clear the signal flag */
got_signal = 0;
#endif /* MINGW */
/* Write the cache contents to disk */
filename = key_s[DWM_S_cache_file];
if(cache != 0 && filename != 0) {
dw_filename_sanitize(filename);
fname_convert = (char *)dw_to_cstr(filename);
dwh_write_hash(cache,fname_convert);
free(fname_convert);
}
#ifndef MINGW
/* Exit if they requested it (*NIX only) */
if(number == 1) { /* TERM */
exit(0);
} else if(number == 2) { /* HUP */
exit(8); /* Use by Duende to indicate we exited with HUP */
}
#endif /* MINGW */
}
/* Initialize the cache */
void init_cache() {
dw_str *filename = 0;
char *fname_convert = 0;
struct stat cache_st;
dwh_process_mararc_params(); /* Get the cache size */
if(cache != 0) { /* Don't init cache twice */
return;
}
/* See if we can read the cache from a file */
filename = key_s[DWM_S_cache_file];
if(filename != 0 && do_read_cache == 1) {
dw_filename_sanitize(filename);
fname_convert = (char *)dw_to_cstr(filename);
if(stat(fname_convert,&cache_st) == 0 &&
cache_st.st_mtime < mararc_st.st_mtime) {
dw_log_string(
"Cache older than rc file; not reading cache",0);
} else {
cache = dwh_read_hash(fname_convert);
}
free(fname_convert);
}
if(cache == 0) { /* Just in case read from file failed */
cache = dwh_hash_init(0); /* Size comes from dwood2rc */
}
}
/* Drop privileges and become unprivileged user */
void sandbox() {
#ifndef MINGW
#ifndef __CYGWIN__
unsigned char *c = 0;
gid_t g = DW_UID;
if(key_s[DWM_S_chroot_dir] == 0) {
dw_fatal("chroot_dir not set");
}
c = dw_to_cstr(key_s[DWM_S_chroot_dir]);
if(c == 0) {
dw_fatal("Converting chroot_dir to string failed");
}
if(chdir((char *)c) != 0) {
printf("There is no directory %s\n",(char *)c);
dw_fatal("chdir() failed");
}
#ifndef QNX
if(chroot((char *)c) == -1) {
dw_fatal("chroot() failed");
}
#endif /* QNX */
if(setgroups(1,&g) == -1) {
dw_fatal("setgroups() failed");
}
if(setgid(maradns_gid) != 0) {
dw_fatal("setgid() failed");
}
if(setuid(maradns_uid) != 0) {
dw_fatal("setuid() failed");
}
if(setuid(0) == 0) {
dw_fatal("Your kernel\'s setuid() is broken");
}
if(c != 0) {
free(c);
c = 0;
}
return;
#endif /* __CYGWIN__ */
#endif /* MINGW */
}
/* Drop privileges and become unprivileged user */
void sandbox() {
#if ! (defined MINGW || defined __CYGWIN__)
unsigned char *c = 0;
gid_t g = DW_UID;
if(key_s[DWM_S_chroot_dir] == 0) {
dw_fatal("chroot_dir not set");
}
c = dw_to_cstr(key_s[DWM_S_chroot_dir]);
if(c == 0) {
dw_fatal("Converting chroot_dir to string failed");
}
if(chdir((char *)c) != 0) {
dw_fatal("chdir() failed");
}
#ifndef QNX
if(chroot((char *)c) == -1) {
dw_fatal("chroot() failed");
}
#endif
if(setgroups(1,&g) == -1) {
dw_fatal("setgroups() failed");
}
if(setgid(maradns_gid) != 0) {
dw_fatal("setgid() failed");
}
if(setuid(maradns_uid) != 0) {
dw_fatal("setuid() failed");
}
if(setuid(0) == 0) {
dw_fatal("Your kernel\'s setuid() is broken");
}
if(c != 0) {
free(c);
c = 0;
}
return;
#endif /* MINGW */
}
/* Initialize the cache */
void init_cache() {
dw_str *filename = 0;
char *fname_convert = 0;
dwh_process_mararc_params(); /* Get the cache size */
if(cache != 0) { /* Don't init cache twice */
return;
}
/* See if we can read the cache from a file */
filename = key_s[DWM_S_cache_file];
if(filename != 0) {
dw_filename_sanitize(filename);
fname_convert = (char *)dw_to_cstr(filename);
cache = dwh_read_hash(fname_convert);
free(fname_convert);
}
if(cache == 0) { /* Just in case read from file failed */
cache = dwh_hash_init(0); /* Size comes from dwood2rc */
}
}
