diff options
Diffstat (limited to 'contrib/ntp/sntp/libevent/sample/dns-example.c')
| -rw-r--r-- | contrib/ntp/sntp/libevent/sample/dns-example.c | 248 |
1 files changed, 0 insertions, 248 deletions
diff --git a/contrib/ntp/sntp/libevent/sample/dns-example.c b/contrib/ntp/sntp/libevent/sample/dns-example.c deleted file mode 100644 index 15e48ce..0000000 --- a/contrib/ntp/sntp/libevent/sample/dns-example.c +++ /dev/null @@ -1,248 +0,0 @@ -/* - This example code shows how to use the high-level, low-level, and - server-level interfaces of evdns. - - XXX It's pretty ugly and should probably be cleaned up. - */ - -#include <event2/event-config.h> - -/* Compatibility for possible missing IPv6 declarations */ -#include "../ipv6-internal.h" - -#include <sys/types.h> - -#ifdef _WIN32 -#include <winsock2.h> -#include <ws2tcpip.h> -#else -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#endif - -#include <event2/event.h> -#include <event2/dns.h> -#include <event2/dns_struct.h> -#include <event2/util.h> - -#ifdef EVENT__HAVE_NETINET_IN6_H -#include <netinet/in6.h> -#endif - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#define u32 ev_uint32_t -#define u8 ev_uint8_t - -static const char * -debug_ntoa(u32 address) -{ - static char buf[32]; - u32 a = ntohl(address); - evutil_snprintf(buf, sizeof(buf), "%d.%d.%d.%d", - (int)(u8)((a>>24)&0xff), - (int)(u8)((a>>16)&0xff), - (int)(u8)((a>>8 )&0xff), - (int)(u8)((a )&0xff)); - return buf; -} - -static void -main_callback(int result, char type, int count, int ttl, - void *addrs, void *orig) { - char *n = (char*)orig; - int i; - for (i = 0; i < count; ++i) { - if (type == DNS_IPv4_A) { - printf("%s: %s\n", n, debug_ntoa(((u32*)addrs)[i])); - } else if (type == DNS_PTR) { - printf("%s: %s\n", n, ((char**)addrs)[i]); - } - } - if (!count) { - printf("%s: No answer (%d)\n", n, result); - } - fflush(stdout); -} - -static void -gai_callback(int err, struct evutil_addrinfo *ai, void *arg) -{ - const char *name = arg; - int i; - if (err) { - printf("%s: %s\n", name, evutil_gai_strerror(err)); - } - if (ai && ai->ai_canonname) - printf(" %s ==> %s\n", name, ai->ai_canonname); - for (i=0; ai; ai = ai->ai_next, ++i) { - char buf[128]; - if (ai->ai_family == PF_INET) { - struct sockaddr_in *sin = - (struct sockaddr_in*)ai->ai_addr; - evutil_inet_ntop(AF_INET, &sin->sin_addr, buf, - sizeof(buf)); - printf("[%d] %s: %s\n",i,name,buf); - } else { - struct sockaddr_in6 *sin6 = - (struct sockaddr_in6*)ai->ai_addr; - evutil_inet_ntop(AF_INET6, &sin6->sin6_addr, buf, - sizeof(buf)); - printf("[%d] %s: %s\n",i,name,buf); - } - } -} - -static void -evdns_server_callback(struct evdns_server_request *req, void *data) -{ - int i, r; - (void)data; - /* dummy; give 192.168.11.11 as an answer for all A questions, - * give foo.bar.example.com as an answer for all PTR questions. */ - for (i = 0; i < req->nquestions; ++i) { - u32 ans = htonl(0xc0a80b0bUL); - if (req->questions[i]->type == EVDNS_TYPE_A && - req->questions[i]->dns_question_class == EVDNS_CLASS_INET) { - printf(" -- replying for %s (A)\n", req->questions[i]->name); - r = evdns_server_request_add_a_reply(req, req->questions[i]->name, - 1, &ans, 10); - if (r<0) - printf("eeep, didn't work.\n"); - } else if (req->questions[i]->type == EVDNS_TYPE_PTR && - req->questions[i]->dns_question_class == EVDNS_CLASS_INET) { - printf(" -- replying for %s (PTR)\n", req->questions[i]->name); - r = evdns_server_request_add_ptr_reply(req, NULL, req->questions[i]->name, - "foo.bar.example.com", 10); - if (r<0) - printf("ugh, no luck"); - } else { - printf(" -- skipping %s [%d %d]\n", req->questions[i]->name, - req->questions[i]->type, req->questions[i]->dns_question_class); - } - } - - r = evdns_server_request_respond(req, 0); - if (r<0) - printf("eeek, couldn't send reply.\n"); -} - -static int verbose = 0; - -static void -logfn(int is_warn, const char *msg) { - if (!is_warn && !verbose) - return; - fprintf(stderr, "%s: %s\n", is_warn?"WARN":"INFO", msg); -} - -int -main(int c, char **v) { - int idx; - int reverse = 0, servertest = 0, use_getaddrinfo = 0; - struct event_base *event_base = NULL; - struct evdns_base *evdns_base = NULL; - const char *resolv_conf = NULL; - if (c<2) { - fprintf(stderr, "syntax: %s [-x] [-v] [-c resolv.conf] hostname\n", v[0]); - fprintf(stderr, "syntax: %s [-servertest]\n", v[0]); - return 1; - } - idx = 1; - while (idx < c && v[idx][0] == '-') { - if (!strcmp(v[idx], "-x")) - reverse = 1; - else if (!strcmp(v[idx], "-v")) - verbose = 1; - else if (!strcmp(v[idx], "-g")) - use_getaddrinfo = 1; - else if (!strcmp(v[idx], "-servertest")) - servertest = 1; - else if (!strcmp(v[idx], "-c")) { - if (idx + 1 < c) - resolv_conf = v[++idx]; - else - fprintf(stderr, "-c needs an argument\n"); - } else - fprintf(stderr, "Unknown option %s\n", v[idx]); - ++idx; - } - -#ifdef _WIN32 - { - WSADATA WSAData; - WSAStartup(0x101, &WSAData); - } -#endif - - event_base = event_base_new(); - evdns_base = evdns_base_new(event_base, EVDNS_BASE_DISABLE_WHEN_INACTIVE); - evdns_set_log_fn(logfn); - - if (servertest) { - evutil_socket_t sock; - struct sockaddr_in my_addr; - sock = socket(PF_INET, SOCK_DGRAM, 0); - if (sock == -1) { - perror("socket"); - exit(1); - } - evutil_make_socket_nonblocking(sock); - my_addr.sin_family = AF_INET; - my_addr.sin_port = htons(10053); - my_addr.sin_addr.s_addr = INADDR_ANY; - if (bind(sock, (struct sockaddr*)&my_addr, sizeof(my_addr))<0) { - perror("bind"); - exit(1); - } - evdns_add_server_port_with_base(event_base, sock, 0, evdns_server_callback, NULL); - } - if (idx < c) { - int res; -#ifdef _WIN32 - if (resolv_conf == NULL) - res = evdns_base_config_windows_nameservers(evdns_base); - else -#endif - res = evdns_base_resolv_conf_parse(evdns_base, - DNS_OPTION_NAMESERVERS, - resolv_conf ? resolv_conf : "/etc/resolv.conf"); - - if (res < 0) { - fprintf(stderr, "Couldn't configure nameservers"); - return 1; - } - } - - printf("EVUTIL_AI_CANONNAME in example = %d\n", EVUTIL_AI_CANONNAME); - for (; idx < c; ++idx) { - if (reverse) { - struct in_addr addr; - if (evutil_inet_pton(AF_INET, v[idx], &addr)!=1) { - fprintf(stderr, "Skipping non-IP %s\n", v[idx]); - continue; - } - fprintf(stderr, "resolving %s...\n",v[idx]); - evdns_base_resolve_reverse(evdns_base, &addr, 0, main_callback, v[idx]); - } else if (use_getaddrinfo) { - struct evutil_addrinfo hints; - memset(&hints, 0, sizeof(hints)); - hints.ai_family = PF_UNSPEC; - hints.ai_protocol = IPPROTO_TCP; - hints.ai_flags = EVUTIL_AI_CANONNAME; - fprintf(stderr, "resolving (fwd) %s...\n",v[idx]); - evdns_getaddrinfo(evdns_base, v[idx], NULL, &hints, - gai_callback, v[idx]); - } else { - fprintf(stderr, "resolving (fwd) %s...\n",v[idx]); - evdns_base_resolve_ipv4(evdns_base, v[idx], 0, main_callback, v[idx]); - } - } - fflush(stdout); - event_base_dispatch(event_base); - return 0; -} - |
