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examples/dtls-sock: make use of helper functions

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This commit is contained in:
Benjamin Valentin 2023-11-30 16:36:13 +01:00
parent 714958ad3c
commit 4085b7f8a1
2 changed files with 15 additions and 72 deletions
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1
examples/dtls-sock/Makefile
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@ -13,6 +13,7 @@ USEMODULE += netdev_default
USEMODULE += auto_init_gnrc_netif
# Specify the mandatory networking modules for IPv6 and UDP
USEMODULE += gnrc_ipv6_default
USEMODULE += netutils
# Specify DTLS implementation
USEPKG += tinydtls

86
examples/dtls-sock/dtls-client.c
View File

@ -27,6 +27,7 @@
#include "net/ipv6/addr.h"
#include "net/credman.h"
#include "net/sock/util.h"
#include "net/utils.h"
#include "tinydtls_keys.h"
@ -88,27 +89,6 @@ static const credman_credential_t credential1 = {
}
},
};
static credman_tag_t _client_psk_cb(sock_dtls_t *sock, sock_udp_ep_t *ep, credman_tag_t tags[],
unsigned tags_len, const char *hint, size_t hint_len)
{
(void) sock;
(void) tags;
(void) tags_len;
/* this callback is here just to show the functionality, it only prints the received hint */
char addrstr[IPV6_ADDR_MAX_STR_LEN];
uint16_t port;
sock_udp_ep_fmt(ep, addrstr, &port);
printf("From [%s]:%d\n", addrstr, port);
if (hint && hint_len) {
printf("Client got hint: %.*s\n", (unsigned)hint_len, hint);
}
return CREDMAN_TAG_EMPTY;
}
#endif
static int client_send(char *addr_str, char *data, size_t datalen)
@ -122,33 +102,17 @@ static int client_send(char *addr_str, char *data, size_t datalen)
local.port = 12345;
remote.port = DTLS_DEFAULT_PORT;
uint8_t buf[DTLS_HANDSHAKE_BUFSIZE];
credman_tag_t tag = SOCK_DTLS_CLIENT_TAG_0;
/* get interface */
char* iface = ipv6_addr_split_iface(addr_str);
if (iface) {
int pid = atoi(iface);
if (gnrc_netif_get_by_pid(pid) == NULL) {
puts("Invalid network interface");
return -1;
}
remote.netif = pid;
} else if (gnrc_netif_numof() == 1) {
/* assign the single interface found in gnrc_netif_numof() */
remote.netif = gnrc_netif_iter(NULL)->pid;
} else {
/* no interface is given, or given interface is invalid */
/* FIXME This probably is not valid with multiple interfaces */
remote.netif = SOCK_ADDR_ANY_NETIF;
netif_t *netif;
res = netutils_get_ipv6((void *)&remote.addr, &netif, addr_str);
if (res) {
printf("Error parsing remote address\n");
return res;
}
if (!ipv6_addr_from_str((ipv6_addr_t *)remote.addr.ipv6, addr_str)) {
puts("Error parsing destination address");
return -1;
}
if (sock_udp_create(&udp_sock, &local, NULL, 0) < 0) {
puts("Error creating UDP sock");
return -1;
if (netif) {
remote.netif = netif_get_id(netif);
}
res = credman_add(&credential0);
@ -159,13 +123,6 @@ static int client_send(char *addr_str, char *data, size_t datalen)
return -1;
}
if (sock_dtls_create(&dtls_sock, &udp_sock, SOCK_DTLS_CLIENT_TAG_0,
SOCK_DTLS_1_2, SOCK_DTLS_CLIENT) < 0) {
puts("Error creating DTLS sock");
sock_udp_close(&udp_sock);
return -1;
}
#if IS_ACTIVE(CONFIG_DTLS_PSK)
/* register a second PSK credential */
res = credman_add(&credential1);
@ -175,32 +132,17 @@ static int client_send(char *addr_str, char *data, size_t datalen)
sock_udp_close(&udp_sock);
return -1;
}
/* make the new credential available to the sock */
if (sock_dtls_add_credential(&dtls_sock, SOCK_DTLS_CLIENT_TAG_1) < 0) {
printf("Error cannot add credential to the sock: %" PRIdSIZE "\n", res);
sock_udp_close(&udp_sock);
return -1;
}
/* register a callback for PSK credential selection */
sock_dtls_set_client_psk_cb(&dtls_sock, _client_psk_cb);
tag = SOCK_DTLS_CLIENT_TAG_1;
#endif
res = sock_dtls_session_init(&dtls_sock, &remote, &session);
if (res <= 0) {
res = sock_dtls_establish_session(&udp_sock, &dtls_sock, &session, tag,
&local, &remote, buf, sizeof(buf));
if (res) {
sock_udp_close(&udp_sock);
printf("Error establishing connection: %d\n", (int)res);
return res;
}
res = sock_dtls_recv(&dtls_sock, &session, buf, sizeof(buf),
SOCK_NO_TIMEOUT);
if (res != -SOCK_DTLS_HANDSHAKE) {
printf("Error creating session: %" PRIdSIZE "\n", res);
sock_dtls_close(&dtls_sock);
sock_udp_close(&udp_sock);
return -1;
}
printf("Connection to server successful\n");
if (sock_dtls_send(&dtls_sock, &session, data, datalen, 0) < 0) {