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coap: pass null-terminated string to gethostbyname

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coap client parse a string by `coap_split_uri`,fetch host should by `host.length`
otherwise, would cause `gethostbyname` failed because of inappropriate  parameter.
This commit is contained in:
chenwu
2018-06-28 17:27:10 +08:00
parent 568da37af7
commit 4898135c15
1 changed files with 11 additions and 2 deletions
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13
examples/protocols/coap_client/main/coap_client_example_main.c
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@@ -79,7 +79,7 @@ static void coap_example_task(void *p)
coap_pdu_t* request = NULL; coap_pdu_t* request = NULL;
const char* server_uri = COAP_DEFAULT_DEMO_URI; const char* server_uri = COAP_DEFAULT_DEMO_URI;
uint8_t get_method = 1; uint8_t get_method = 1;
char* phostname = NULL;
while (1) { while (1) {
/* Wait for the callback to set the CONNECTED_BIT in the /* Wait for the callback to set the CONNECTED_BIT in the
event group. event group.
@@ -93,7 +93,16 @@ static void coap_example_task(void *p)
break; break;
} }
hp = gethostbyname((const char *)uri.host.s); phostname = (char *)calloc(1, uri.host.length + 1);
if (phostname == NULL) {
ESP_LOGE(TAG, "calloc failed");
continue;
}
memcpy(phostname, uri.host.s, uri.host.length);
hp = gethostbyname(phostname);
free(phostname);
if (hp == NULL) { if (hp == NULL) {
ESP_LOGE(TAG, "DNS lookup failed"); ESP_LOGE(TAG, "DNS lookup failed");