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| author | Nikos Mavrogiannopoulos <nmav@gnutls.org> | 2016-04-27 08:17:45 +0200 |
|---|---|---|
| committer | Nikos Mavrogiannopoulos <nmav@gnutls.org> | 2016-04-27 08:17:45 +0200 |
| commit | edc867eb3c13b09b037dc7c4b7670f3fc87856b0 (patch) | |
| tree | 57f5c7785d3418b07e3a659304d872155f5bdae4 /doc/examples/ex-client-dtls.c | |
| parent | 2b5cf00c137c7d63c133f407d2a6f4cd5fdd5ee9 (diff) | |
| download | gnutls-edc867eb3c13b09b037dc7c4b7670f3fc87856b0.tar.gz | |
examples: introduced basic error checking in more examples
Diffstat (limited to 'doc/examples/ex-client-dtls.c')
| -rw-r--r-- | doc/examples/ex-client-dtls.c | 37 |
1 files changed, 16 insertions, 21 deletions
diff --git a/doc/examples/ex-client-dtls.c b/doc/examples/ex-client-dtls.c index dea3b687f3..d154015395 100644 --- a/doc/examples/ex-client-dtls.c +++ b/doc/examples/ex-client-dtls.c @@ -10,6 +10,7 @@ #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h> +#include <assert.h> #include <unistd.h> #include <gnutls/gnutls.h> #include <gnutls/dtls.h> @@ -17,6 +18,8 @@ /* A very basic Datagram TLS client, over UDP with X.509 authentication. */ +#define CHECK(x) assert((x)>=0) + #define MAX_BUF 1024 #define CAFILE "/etc/ssl/certs/ca-certificates.crt" #define MSG "GET / HTTP/1.0\r\n\r\n" @@ -30,7 +33,6 @@ int main(void) int ret, sd, ii; gnutls_session_t session; char buffer[MAX_BUF + 1]; - const char *err; gnutls_certificate_credentials_t xcred; if (gnutls_check_version("3.1.4") == NULL) { @@ -39,34 +41,27 @@ int main(void) } /* for backwards compatibility with gnutls < 3.3.0 */ - gnutls_global_init(); + CHECK(gnutls_global_init()); /* X509 stuff */ - gnutls_certificate_allocate_credentials(&xcred); + CHECK(gnutls_certificate_allocate_credentials(&xcred)); /* sets the trusted cas file */ - gnutls_certificate_set_x509_trust_file(xcred, CAFILE, - GNUTLS_X509_FMT_PEM); - gnutls_certificate_set_verify_function(xcred, - verify_certificate_callback); + CHECK(gnutls_certificate_set_x509_trust_file(xcred, CAFILE, + GNUTLS_X509_FMT_PEM)); /* Initialize TLS session */ - gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM); + CHECK(gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM)); /* Use default priorities */ - ret = gnutls_priority_set_direct(session, - "NORMAL", &err); - if (ret < 0) { - if (ret == GNUTLS_E_INVALID_REQUEST) { - fprintf(stderr, "Syntax error at: %s\n", err); - } - exit(1); - } + CHECK(gnutls_set_default_priority(session)); /* put the x509 credentials to the current session */ - gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred); - gnutls_server_name_set(session, GNUTLS_NAME_DNS, "my_host_name", - strlen("my_host_name")); + CHECK(gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred)); + CHECK(gnutls_server_name_set(session, GNUTLS_NAME_DNS, "my_host_name", + strlen("my_host_name"))); + + gnutls_session_set_verify_cert(session, "my_host_name", 0); /* connect to the peer */ sd = udp_connect(); @@ -96,7 +91,7 @@ int main(void) gnutls_free(desc); } - gnutls_record_send(session, MSG, strlen(MSG)); + CHECK(gnutls_record_send(session, MSG, strlen(MSG))); ret = gnutls_record_recv(session, buffer, MAX_BUF); if (ret == 0) { @@ -120,7 +115,7 @@ int main(void) /* It is suggested not to use GNUTLS_SHUT_RDWR in DTLS * connections because the peer's closure message might * be lost */ - gnutls_bye(session, GNUTLS_SHUT_WR); + CHECK(gnutls_bye(session, GNUTLS_SHUT_WR)); end: |