#include "config.h" #include #include #include #include #include #include #include "logerr.h" #include "util.h" #include "random.h" int urandom_bytes(const size_t n, uint8_t (*const addr)[]) { int rc = -1; uint8_t *ret = NULL; FILE *f = NULL; ret = malloc(n); if (ret == NULL) { logerr("malloc(): %s", strerror(errno)); goto out; } f = fopen("/dev/urandom", "r"); if (f == NULL) { logerr("fopen(): %s", strerror(errno)); goto out; } const size_t read_count = fread(ret, 1, n, f); if (ferror(f)) { logerr("fread(): %s", strerror(errno)); goto out; } assert(read_count == n); if (fclose(f)) { logerr("fclose(): %s", strerror(errno)); goto out; } f = NULL; memcpy(addr, ret, n); rc = 0; out: if (f != NULL) { if (fclose(f)) { logerr("fclose(): %s", strerror(errno)); rc = -1; } } if (ret != NULL) { freeit((void *)&ret); } return rc; }