diff options
Diffstat (limited to 'dns_example.c')
| -rw-r--r-- | dns_example.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/dns_example.c b/dns_example.c index 843a1d7..62c9a7f 100644 --- a/dns_example.c +++ b/dns_example.c @@ -7,22 +7,29 @@ int main() struct dns_answers *cur; const char *server = "1.1.1.1"; /* place your favourite one */ struct dns_answers *ans = dns_get(server, "veresov.pro", dns_type_a); + /* Host is always human-readable domain name of request. */ for (cur = ans; cur; cur = cur->next) { if (cur->type == dns_type_a) { + /* IP is stored in data as 4 bytes (unsigned chars). */ unsigned char *ip = cur->data; printf("IP address of %s is %d.%d.%d.%d.\n", cur->host, ip[0], ip[1], ip[2], ip[3]); } else if (cur->type == dns_type_cname) { + /* Data is human-readable domain name of response. */ printf("Cannonical name of %s is %s.\n", cur->host, cur->data); } else if (cur->type == dns_type_txt) { + /* Data is null terminated string of TXT response. */ printf("Text from %s: %s\n", cur->host, cur->data); } else if (cur->type == dns_type_srv) { + /* SRV answer data is pretty complex, + so functions to access it are provided. */ printf("Service %s is located at %s on port %d " "with priority %d and weight %d.\n", cur->host, dns_srv_server(cur->data), dns_srv_port(cur->data), dns_srv_priority(cur->data), dns_srv_weight(cur->data)); } else if (cur->type == dns_type_mx) { + /* Same as with SRV, functions provided. */ printf("Mail exchange server for %s with preference %d is %s.\n", cur->host, dns_mx_preference(cur->data), dns_mx_server(cur->data)); |