mirror of
https://git.tartarus.org/simon/putty.git
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f39c51f9a7
This gets rid of all those annoying 'win', 'ux' and 'gtk' prefixes which made filenames annoying to type and to tab-complete. Also, as with my other recent renaming sprees, I've taken the opportunity to expand and clarify some of the names so that they're not such cryptic abbreviations.
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*
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* Noise generation for PuTTY's cryptographic random number
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* generator.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include "putty.h"
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#include "ssh.h"
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#include "storage.h"
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static bool read_dev_urandom(char *buf, int len)
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{
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int fd;
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int ngot, ret;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0)
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return false;
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ngot = 0;
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while (ngot < len) {
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ret = read(fd, buf+ngot, len-ngot);
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if (ret < 0) {
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close(fd);
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return false;
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}
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ngot += ret;
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}
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close(fd);
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return true;
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}
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/*
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* This function is called once, at PuTTY startup. It will do some
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* slightly silly things such as fetching an entire process listing
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* and scanning /tmp, load the saved random seed from disk, and
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* also read 32 bytes out of /dev/urandom.
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*/
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void noise_get_heavy(void (*func) (void *, int))
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{
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char buf[512];
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FILE *fp;
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int ret;
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bool got_dev_urandom = false;
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if (read_dev_urandom(buf, 32)) {
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got_dev_urandom = true;
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func(buf, 32);
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}
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fp = popen("ps -axu 2>/dev/null", "r");
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if (fp) {
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while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
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func(buf, ret);
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pclose(fp);
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} else if (!got_dev_urandom) {
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fprintf(stderr, "popen: %s\n"
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"Unable to access fallback entropy source\n", strerror(errno));
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exit(1);
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}
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fp = popen("ls -al /tmp 2>/dev/null", "r");
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if (fp) {
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while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
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func(buf, ret);
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pclose(fp);
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} else if (!got_dev_urandom) {
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fprintf(stderr, "popen: %s\n"
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"Unable to access fallback entropy source\n", strerror(errno));
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exit(1);
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}
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read_random_seed(func);
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}
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/*
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* This function is called on a timer, and grabs as much changeable
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* system data as it can quickly get its hands on.
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*/
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void noise_regular(void)
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{
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int fd;
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int ret;
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char buf[512];
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struct rusage rusage;
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if ((fd = open("/proc/meminfo", O_RDONLY)) >= 0) {
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while ( (ret = read(fd, buf, sizeof(buf))) > 0)
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random_add_noise(NOISE_SOURCE_MEMINFO, buf, ret);
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close(fd);
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}
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if ((fd = open("/proc/stat", O_RDONLY)) >= 0) {
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while ( (ret = read(fd, buf, sizeof(buf))) > 0)
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random_add_noise(NOISE_SOURCE_STAT, buf, ret);
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close(fd);
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}
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getrusage(RUSAGE_SELF, &rusage);
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random_add_noise(NOISE_SOURCE_RUSAGE, &rusage, sizeof(rusage));
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}
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/*
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* This function is called on every keypress or mouse move, and
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* will add the current time to the noise pool. It gets the scan
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* code or mouse position passed in, and adds that too.
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*/
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void noise_ultralight(NoiseSourceId id, unsigned long data)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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random_add_noise(NOISE_SOURCE_TIME, &tv, sizeof(tv));
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random_add_noise(id, &data, sizeof(data));
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}
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uint64_t prng_reseed_time_ms(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000 + tv.tv_usec / 1000;
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}
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