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emulator: support /dev/{u,}random configuration at compile time; default is still /dev/urandom (#396)

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This commit is contained in:
Yannick Heneault 2018-08-10 09:40:08 -04:00 committed by Pavol Rusnak
parent cf83a97c84
commit df5348fb14
2 changed files with 21 additions and 9 deletions
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4
Makefile.include
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@ -98,6 +98,10 @@ CFLAGS += -I/usr/include/SDL2 -D_REENTRANT
LDLIBS += -lSDL2
endif
ifdef RANDOM_DEV_FILE
CFLAGS += -DRANDOM_DEV_FILE=\"$(RANDOM_DEV_FILE)\"
endif
else
ifdef APPVER
CFLAGS += -DAPPVER=$(APPVER)

26
emulator/setup.c
View File

@ -34,11 +34,15 @@
#define EMULATOR_FLASH_FILE "emulator.img"
#ifndef RANDOM_DEV_FILE
#define RANDOM_DEV_FILE "/dev/urandom"
#endif
uint8_t *emulator_flash_base = NULL;
uint32_t __stack_chk_guard;
static int urandom = -1;
static int random_fd = -1;
static void setup_urandom(void);
static void setup_flash(void);
@ -53,17 +57,21 @@ void __attribute__((noreturn)) shutdown(void) {
}
void emulatorRandom(void *buffer, size_t size) {
ssize_t n = read(urandom, buffer, size);
if (n < 0 || ((size_t) n) != size) {
perror("Failed to read /dev/urandom");
exit(1);
}
ssize_t n, len = 0;
do {
n = read(random_fd, (char*)buffer + len, size - len);
if (n < 0) {
perror("Failed to read " RANDOM_DEV_FILE);
exit(1);
}
len += n;
} while (len != (ssize_t)size);
}
static void setup_urandom(void) {
urandom = open("/dev/urandom", O_RDONLY);
if (urandom < 0) {
perror("Failed to open /dev/urandom");
random_fd = open(RANDOM_DEV_FILE, O_RDONLY);
if (random_fd < 0) {
perror("Failed to open " RANDOM_DEV_FILE);
exit(1);
}
}