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better handling of OpenSSL errors

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This commit is contained in:
Patrick Pelletier 2013-02-25 23:43:05 -08:00
parent 42d7441ac4
commit 5754d96a6e
1 changed files with 42 additions and 5 deletions
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47
sample/https-client.c
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@ -45,7 +45,27 @@ http_request_done(struct evhttp_request *req, void *ctx)
int nread;
if (req == NULL) {
/* If req is NULL, it means an error occurred, but
* sadly we are mostly left guessing what the error
* might have been. We'll do our best... */
struct bufferevent *bev = (struct bufferevent *) ctx;
unsigned long oslerr;
int printed_err = 0;
int errcode = EVUTIL_SOCKET_ERROR();
fprintf(stderr, "some request failed - no idea which one though!\n");
/* Print out the OpenSSL error queue that libevent
* squirreled away for us, if any. */
while ((oslerr = bufferevent_get_openssl_error(bev))) {
ERR_error_string_n(oslerr, buffer, sizeof(buffer));
fprintf(stderr, "%s\n", buffer);
printed_err = 1;
}
/* If the OpenSSL error queue was empty, maybe it was a
* socket error; let's try printing that. */
if (! printed_err)
fprintf(stderr, "socket error = %s (%d)\n",
evutil_socket_error_to_string(errcode),
errcode);
return;
}
@ -78,6 +98,18 @@ die(const char *msg)
exit(1);
}
static void
die_openssl(const char *func)
{
fprintf (stderr, "%s failed:\n", func);
/* This is the OpenSSL function that prints the contents of the
* error stack to the specified file handle. */
ERR_print_errors_fp (stderr);
exit(1);
}
int
main(int argc, char **argv)
{
@ -137,12 +169,18 @@ main(int argc, char **argv)
ERR_load_crypto_strings();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
/* This isn't strictly necessary... OpenSSL performs RAND_poll
* automatically on first use of random number generator. */
r = RAND_poll();
if (r == 0) {
fprintf(stderr, "RAND_poll() failed.\n");
return 1;
die_openssl("RAND_poll");
}
/* Create a new OpenSSL context */
ssl_ctx = SSL_CTX_new(SSLv23_method());
if (!ssl_ctx)
die_openssl("SSL_CTX_new");
// Create event base
base = event_base_new();
@ -154,8 +192,7 @@ main(int argc, char **argv)
// Create OpenSSL bufferevent and stack evhttp on top of it
ssl = SSL_new(ssl_ctx);
if (ssl == NULL) {
fprintf(stderr, "SSL_new() failed\n");
return 1;
die_openssl("SSL_new()");
}
if (strcasecmp(scheme, "http") == 0) {
@ -183,7 +220,7 @@ main(int argc, char **argv)
}
// Fire off the request
req = evhttp_request_new(http_request_done, NULL);
req = evhttp_request_new(http_request_done, bev);
if (req == NULL) {
fprintf(stderr, "evhttp_request_new() failed\n");
return 1;