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Member "HTTPing-2.9/res.c" (29 Oct 2022, 1788 Bytes) of package /linux/www/HTTPing-2.9.tar.gz:
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1 /* Released under AGPL v3 with exception for the OpenSSL library. See license.txt */
2
3 #include <sys/types.h>
4 #include <sys/time.h>
5 #include <sys/socket.h>
6 #include <netinet/in.h>
7 #include <libintl.h>
8 #include <netdb.h>
9 #include <errno.h>
10 #include <stdio.h>
11 #include <string.h>
12 #include <unistd.h>
13
14 #include "gen.h"
15 #include "res.h"
16 #include "error.h"
17
18 int resolve_host(const char *host, struct addrinfo **ai, char use_ipv6, int portnr)
19 {
20 int rc = -1;
21 char servname[10];
22 struct addrinfo myaddr;
23
24 memset(&myaddr, 0, sizeof myaddr);
25
26 /* myaddr.ai_flags = AI_PASSIVE; */
27 myaddr.ai_socktype = SOCK_STREAM;
28 myaddr.ai_protocol = IPPROTO_TCP;
29 myaddr.ai_family = use_ipv6 ? AF_INET6 : AF_INET;
30 snprintf(servname, sizeof servname, "%d", portnr);
31
32 rc = getaddrinfo(host, servname, &myaddr, ai);
33
34 if (rc != 0)
35 set_error(gettext("Resolving %s %sfailed: %s"), host, use_ipv6 ? gettext("(IPv6) ") : "", gai_strerror(rc));
36
37 return rc;
38 }
39
40 struct addrinfo * select_resolved_host(struct addrinfo *ai, char use_ipv6)
41 {
42 struct addrinfo *p = ai;
43 while(p)
44 {
45 if (p -> ai_family == AF_INET6 && use_ipv6)
46 return p;
47
48 if (p -> ai_family == AF_INET)
49 return p;
50
51 p = p -> ai_next;
52 }
53
54 return NULL;
55 }
56
57 void get_addr(struct addrinfo *ai_use, struct sockaddr_in6 *addr)
58 {
59 memcpy(addr, ai_use->ai_addr, ai_use->ai_addrlen);
60 }
61
62 #define incopy(a) *((struct in_addr *)a)
63
64 int resolve_host_ipv4(const char *host, struct sockaddr_in *addr)
65 {
66 struct hostent *hostdnsentries = gethostbyname(host);
67
68 if (hostdnsentries == NULL)
69 {
70 set_error(gettext("Problem resolving %s (IPv4): %s"), host, hstrerror(h_errno));
71
72 return -1;
73 }
74
75 /* create address structure */
76 addr -> sin_family = hostdnsentries -> h_addrtype;
77 addr -> sin_addr = incopy(hostdnsentries -> h_addr_list[0]);
78
79 return 0;
80 }