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sslgen.c: fix Curl_rand() compiler warning

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Use simple seeding method upon RANDOM_FILE seeding method failure.
This commit is contained in:
Yang Tse 2013-07-15 15:54:28 +02:00
parent 9c15325d34
commit d4492f955d
1 changed files with 32 additions and 34 deletions
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66
lib/sslgen.c
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@ -187,45 +187,43 @@ unsigned int Curl_rand(struct SessionHandle *data)
{ {
unsigned int r; unsigned int r;
static unsigned int randseed; static unsigned int randseed;
static bool seeded; static bool seeded = FALSE;
#ifdef have_curlssl_random #ifndef have_curlssl_random
if(!data) { (void)data;
#endif #else
if(data) {
if(!seeded) {
#ifdef RANDOM_FILE
/* if there's a random file to read a seed from, use it */
int fd = open(RANDOM_FILE, O_RDONLY);
seeded = TRUE;
if(fd > -1) {
/* read random data into the randseed variable */
read(fd, &randseed, sizeof(randseed));
close(fd);
}
else
#endif /* RANDOM_FILE */
{
struct timeval now = curlx_tvnow();
randseed += (unsigned int) now.tv_usec + (unsigned int)now.tv_sec;
randseed = randseed * 1103515245 + 12345;
randseed = randseed * 1103515245 + 12345;
randseed = randseed * 1103515245 + 12345;
seeded = TRUE;
}
}
/* Return an unsigned 32-bit pseudo-random number. */
r = randseed = randseed * 1103515245 + 12345;
return (r << 16) | ((r >> 16) & 0xFFFF);
#ifdef have_curlssl_random
}
else {
Curl_ssl_random(data, (unsigned char *)&r, sizeof(r)); Curl_ssl_random(data, (unsigned char *)&r, sizeof(r));
return r; return r;
} }
#endif #endif
#ifdef RANDOM_FILE
if(!seeded) {
/* if there's a random file to read a seed from, use it */
int fd = open(RANDOM_FILE, O_RDONLY);
if(fd > -1) {
/* read random data into the randseed variable */
ssize_t nread = read(fd, &randseed, sizeof(randseed));
if(nread == sizeof(randseed))
seeded = TRUE;
close(fd);
}
}
#endif
if(!seeded) {
struct timeval now = curlx_tvnow();
randseed += (unsigned int)now.tv_usec + (unsigned int)now.tv_sec;
randseed = randseed * 1103515245 + 12345;
randseed = randseed * 1103515245 + 12345;
randseed = randseed * 1103515245 + 12345;
seeded = TRUE;
}
/* Return an unsigned 32-bit pseudo-random number. */
r = randseed = randseed * 1103515245 + 12345;
return (r << 16) | ((r >> 16) & 0xFFFF);
} }
#ifdef USE_SSL #ifdef USE_SSL