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| author | Daniel Stenberg <daniel@haxx.se> | 2007-05-30 21:37:17 +0000 |
|---|---|---|
| committer | Daniel Stenberg <daniel@haxx.se> | 2007-05-30 21:37:17 +0000 |
| commit | 49fdeb1de4f01665a3835ab3b3f5b777e6d68ec1 (patch) | |
| tree | 62fb5b4b9673199c58f7aa67b50cd14217737b99 | |
| parent | 7a77f24d26f755421b91a0ea3852b6348d637861 (diff) | |
| download | c-ares-49fdeb1de4f01665a3835ab3b3f5b777e6d68ec1.tar.gz c-ares-49fdeb1de4f01665a3835ab3b3f5b777e6d68ec1.tar.bz2 c-ares-49fdeb1de4f01665a3835ab3b3f5b777e6d68ec1.zip | |
first take at detecting a random device and seeding the random key using data
from it in randomize_key()
| -rw-r--r-- | ares_init.c | 16 | ||||
| -rw-r--r-- | configure.ac | 16 |
2 files changed, 30 insertions, 2 deletions
diff --git a/ares_init.c b/ares_init.c index e86d80c..efde967 100644 --- a/ares_init.c +++ b/ares_init.c @@ -1276,6 +1276,7 @@ static void natural_mask(struct apattern *pat) static void randomize_key(unsigned char* key,int key_data_len) { int randomized = 0; + int counter=0; #ifdef WIN32 HMODULE lib=LoadLibrary("ADVAPI32.DLL"); if (lib) { @@ -1286,11 +1287,22 @@ static void randomize_key(unsigned char* key,int key_data_len) FreeLibrary(lib); } +#else /* !WIN32 */ +#ifdef RANDOM_FILE + char buffer[256]; + FILE *f = fopen(RANDOM_FILE, "rb"); + if(f) { + size_t i; + size_t rc = fread(buffer, key_data_len, 1, f); + for(i=0; i<rc && counter < key_data_len; i++) + key[counter++]=buffer[i]; + fclose(f); + } #endif +#endif /* WIN32 */ if ( !randomized ) { - int counter; - for (counter=0;counter<key_data_len;counter++) + for (;counter<key_data_len;counter++) key[counter]=rand() % 256; } } diff --git a/configure.ac b/configure.ac index 4eb62d1..5749442 100644 --- a/configure.ac +++ b/configure.ac @@ -785,4 +785,20 @@ AC_C_BIGENDIAN( [AC_MSG_WARN([couldn't figure out endianess, assuming little endian!])] ) +dnl Check for user-specified random device +AC_ARG_WITH(random, +AC_HELP_STRING([--with-random=FILE], + [read randomness from FILE (default=/dev/urandom)]), + [ RANDOM_FILE="$withval" ], + [ + dnl Check for random device + AC_CHECK_FILE("/dev/urandom", [ RANDOM_FILE="/dev/urandom"] ) + ] +) +if test -n "$RANDOM_FILE" && test X"$RANDOM_FILE" != Xno ; then + AC_SUBST(RANDOM_FILE) + AC_DEFINE_UNQUOTED(RANDOM_FILE, "$RANDOM_FILE", + [a suitable file/device to read random data from]) +fi + AC_OUTPUT(Makefile) |