303 lines
10 KiB
C
303 lines
10 KiB
C
/* Driver for the Infinite Noise Multiplier USB stick */
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// Required to include clock_gettime
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#define _POSIX_C_SOURCE 200809L
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__FreeBSD__)
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#include <fcntl.h>
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#endif
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <ftdi.h> // requires <sys/types.h>
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#include <getopt.h>
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#include "infnoise.h"
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#include "libinfnoise.h"
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static void initOpts(struct opt_struct *opts) {
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opts->outputMultiplier = 0u;
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opts->daemon = false;
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opts->debug = false;
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opts->devRandom = false;
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opts->noOutput = false;
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opts->listDevices = false;
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opts->raw = false;
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opts->version = false;
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opts->help = false;
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opts->none = false;
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opts->pidFileName =
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opts->serial = NULL;
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}
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// getopt_long(3) options descriptor
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static struct option longopts[] = {
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{"raw", no_argument, NULL, 'r'},
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{"debug", no_argument, NULL, 'D'},
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{"dev-random", no_argument, NULL, 'R'},
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{"no-output", no_argument, NULL, 'n'},
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{"multiplier", required_argument, NULL, 'm'},
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{"pidfile", required_argument, NULL, 'p'},
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{"serial", required_argument, NULL, 's'},
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{"daemon", no_argument, NULL, 'd'},
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{"list-devices", no_argument, NULL, 'l'},
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{"version", no_argument, NULL, 'v'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}};
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// Write the bytes to either stdout, or /dev/random.
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bool outputBytes(uint8_t *bytes, uint32_t length, uint32_t entropy, bool writeDevRandom, char **message) {
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if (!writeDevRandom) {
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if (fwrite(bytes, 1, length, stdout) != length) {
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*message = "Unable to write output from Infinite Noise Multiplier";
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return false;
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}
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} else {
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__FreeBSD__)
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// quell compiler warning about unused variable.
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static int devRandomFD = -1;
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(void) entropy;
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if (devRandomFD < 0)
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devRandomFD = open("/dev/random", O_WRONLY);
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if (devRandomFD < 0) {
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*message = "Unable to open random(4)";
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return false;
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};
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// we are not trapping EINT and EAGAIN; as the random(4) driver seems
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// to not treat partial writes as not an error. So we think that comparing
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// to length is fine.
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//
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if (write(devRandomFD, bytes, length) != length) {
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*message = "Unable to write output from Infinite Noise Multiplier to random(4)";
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return false;
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}
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#endif
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#if defined(__APPLE__)
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*message = "macOS doesn't support writes to entropy pool";
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entropy = 0; // suppress warning
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return false;
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#endif
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#ifdef LINUX
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inmWaitForPoolToHaveRoom();
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inmWriteEntropyToPool(bytes, length, entropy);
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#endif
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}
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return true;
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}
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int main(int argc, char **argv) {
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struct infnoise_context context;
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struct opt_struct opts;
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int ch;
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bool multiplierAssigned = false;
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initOpts(&opts);
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// Process arguments
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while ((ch = getopt_long(argc, argv, "rDRnm:p:s:dlvh", longopts, NULL)) !=
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-1) {
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switch (ch) {
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case 'r':
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opts.raw = true;
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break;
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case 'D':
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opts.debug = true;
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break;
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case 'R':
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opts.devRandom = true;
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break;
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case 'n':
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opts.noOutput = true;
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break;
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case 'm':
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multiplierAssigned = true;
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int tmpOutputMult = atoi(optarg);
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if (tmpOutputMult < 0) {
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fputs("Multiplier must be >= 0\n", stderr);
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return 1;
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}
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opts.outputMultiplier = tmpOutputMult;
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break;
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case 'p':
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opts.pidFileName = optarg;
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if (opts.pidFileName == NULL || !strcmp("", opts.pidFileName)) {
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fputs("--pidfile without file name\n", stderr);
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return 1;
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}
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break;
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case 's':
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opts.serial = optarg;
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if (opts.serial == NULL || !strcmp("", opts.serial)) {
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fputs("--serial without value\n", stderr);
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return 1;
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}
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break;
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case 'd':
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opts.daemon = true;
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break;
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case 'l':
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opts.listDevices = true;
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break;
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case 'v':
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opts.version = true;
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break;
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case 'h':
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opts.help = true;
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break;
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default:
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opts.help = true;
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opts.none = true;
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}
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}
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if (opts.help) {
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fputs("Usage: infnoise [options]\n"
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"Options are:\n"
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" -D, --debug - turn on some debug output\n"
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" -R, --dev-random - write entropy to /dev/random instead of "
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"stdout\n"
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" -r, --raw - do not whiten the output\n"
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" -m, --multiplier <value> - write 256 bits * value for each 512 bits written to\n"
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" the Keccak sponge. Default of 0 means write all the entropy.\n"
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" -n, --no-output - do not write random output data\n"
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" -p, --pidfile <file> - write process ID to file\n"
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" -d, --daemon - run in the background\n"
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" -s, --serial <serial> - use specified device\n"
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" -l, --list-devices - list available devices\n"
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" -v, --version - show version information\n"
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" -h, --help - this help output\n",
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stdout);
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if (opts.none) {
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return 1;
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} else {
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return 0;
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}
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}
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// read environment variables, not overriding command line options
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if (opts.serial == NULL) {
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if (getenv("INFNOISE_SERIAL") != NULL) {
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opts.serial = getenv("INFNOISE_SERIAL");
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}
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}
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if (!opts.debug) {
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if (getenv("INFNOISE_DEBUG") != NULL) {
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if (!strcmp("true", getenv("INFNOISE_DEBUG"))) {
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opts.debug = true;
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}
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}
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}
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if (!multiplierAssigned) {
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if (getenv("INFNOISE_MULTIPLIER") != NULL) {
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int tmpOutputMult = atoi(getenv("INFNOISE_MULTIPLIER"));
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if (tmpOutputMult < 0) {
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fputs("Multiplier must be >= 0\n", stderr);
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return 1;
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}
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multiplierAssigned = true;
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opts.outputMultiplier = tmpOutputMult;
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}
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}
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if (!multiplierAssigned && opts.devRandom) {
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opts.outputMultiplier = 2u; // Don't throw away entropy when writing to /dev/random unless told to do so
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}
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if (opts.version) {
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printf("GIT VERSION - %s\n", GIT_VERSION);
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printf("GIT COMMIT - %s\n", GIT_COMMIT);
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printf("GIT DATE - %s\n", GIT_DATE);
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return 0;
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}
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if (opts.listDevices) {
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devlist_node devlist = listUSBDevices(&context.message);
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if (devlist == NULL) {
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fprintf(stderr, "Error: %s\n", context.message);
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return 1;
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}
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devlist_node curdev = NULL;
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uint8_t i = 0;
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for (curdev = devlist; curdev != NULL; i++) {
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printf("ID: %i, Manufacturer: %s, Description: %s, Serial: %s\n", curdev->id, curdev->manufacturer,
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curdev->description, curdev->serial);
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curdev = curdev->next;
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}
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return 0;
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}
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if (opts.devRandom) {
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#ifdef LINUX
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inmWriteEntropyStart(BUFLEN / 8u, opts.debug); // TODO: create method in libinfnoise.h for this?
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// also TODO: check superUser in this mode (it will fail silently if not :-/)
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#endif
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__FreeBSD__)
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int devRandomFD = open("/dev/random", O_WRONLY);
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if (devRandomFD < 0) {
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fprintf(stderr, "Unable to open /dev/random\n");
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exit(1);
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}
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close(devRandomFD);
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#endif
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#if defined(__APPLE__)
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context.message = "dev/random not supported on macOS";
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fprintf(stderr, "Error: %s\n", context.message);
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return 1;
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#endif
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}
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// Optionally run in the background and optionally write a PID-file
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startDaemon(&opts);
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// initialize USB device, health check and Keccak state (see libinfnoise)
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if (!initInfnoise(&context, opts.serial, !opts.raw, opts.debug)) {
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fprintf(stderr, "Error: %s\n", context.message);
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return 1; // ERROR
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}
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context.errorFlag = false;
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// calculate output size based on the parameters:
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uint64_t resultSize;
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if (opts.outputMultiplier <= 2 || opts.raw) {
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resultSize = 64u;
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} else {
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resultSize = 128u;
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}
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//fprintf(stderr, "resultsize: %lu\n", resultSize);
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// endless loop
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uint64_t totalBytesWritten = 0u;
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while (true) {
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uint8_t result[resultSize];
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uint64_t bytesWritten = readData(&context, result, opts.raw, opts.outputMultiplier);
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totalBytesWritten += bytesWritten;
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if (context.errorFlag) {
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fprintf(stderr, "Error: %s\n", context.message);
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return 1;
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}
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if (!opts.noOutput) {
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if (!outputBytes(result, bytesWritten, context.entropyThisTime, opts.devRandom,
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&context.message)) {
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fprintf(stderr, "Error: %s\n", context.message);
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return 1;
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};
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}
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if (opts.debug &&
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(1u << 20u) * (totalBytesWritten / (1u << 20u)) > (1u << 20u) * (totalBytesWritten + bytesWritten / (1u << 20u))) {
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fprintf(stderr, "Output %lu bytes\n", (unsigned long) totalBytesWritten);
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}
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}
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}
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