diff options
Diffstat (limited to 'src/util/inet_addr_host.c')
| -rw-r--r-- | src/util/inet_addr_host.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/util/inet_addr_host.c b/src/util/inet_addr_host.c new file mode 100644 index 0000000..ea36385 --- /dev/null +++ b/src/util/inet_addr_host.c @@ -0,0 +1,168 @@ +/*++ +/* NAME +/* inet_addr_host 3 +/* SUMMARY +/* determine all host internet interface addresses +/* SYNOPSIS +/* #include <inet_addr_host.h> +/* +/* int inet_addr_host(addr_list, hostname) +/* INET_ADDR_LIST *addr_list; +/* const char *hostname; +/* DESCRIPTION +/* inet_addr_host() determines all interface addresses of the +/* named host. The host may be specified as a symbolic name, +/* or as a numerical address. An empty host expands as the +/* wild-card address. Address results are appended to +/* the specified address list. The result value is the number +/* of addresses appended to the list. +/* DIAGNOSTICS +/* Fatal errors: out of memory. +/* BUGS +/* This code uses the name service, so it talks to the network, +/* and that may not be desirable. +/* SEE ALSO +/* inet_addr_list(3) address list management +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <sys/socket.h> +#include <netdb.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +/* Utility library. */ + +#include <mymalloc.h> +#include <inet_addr_list.h> +#include <inet_addr_host.h> +#include <myaddrinfo.h> +#include <sock_addr.h> +#include <inet_proto.h> +#include <msg.h> + +/* inet_addr_host - look up address list for host */ + +int inet_addr_host(INET_ADDR_LIST *addr_list, const char *hostname) +{ + const char *myname = "inet_addr_host"; + int sock; + struct addrinfo *res0; + struct addrinfo *res; + int aierr; + ssize_t hostnamelen; + const char *hname; + const char *serv; + int initial_count = addr_list->used; + INET_PROTO_INFO *proto_info; + + /* + * The use of square brackets around an IPv6 addresses is required, even + * though we don't enforce it as it'd make the code unnecessarily + * complicated. + * + * XXX AIX 5.1 getaddrinfo() does not allow "0" as service, regardless of + * whether or not a host is specified. + */ + if (*hostname == 0) { + hname = 0; + serv = "1"; + } else if (*hostname == '[' + && hostname[(hostnamelen = strlen(hostname)) - 1] == ']') { + hname = mystrndup(hostname + 1, hostnamelen - 2); + serv = 0; + } else { + hname = hostname; + serv = 0; + } + + proto_info = inet_proto_info(); + if ((aierr = hostname_to_sockaddr(hname, serv, SOCK_STREAM, &res0)) == 0) { + for (res = res0; res; res = res->ai_next) { + + /* + * Safety net. + */ + if (strchr((char *) proto_info->sa_family_list, res->ai_family) == 0) { + msg_info("%s: skipping address family %d for host \"%s\"", + myname, res->ai_family, hostname); + continue; + } + + /* + * On Linux systems it is not unusual for user-land to be out of + * sync with kernel-land. When this is the case we try to be + * helpful and filter out address families that the library + * claims to understand but that are not supported by the kernel. + */ + if ((sock = socket(res->ai_family, SOCK_STREAM, 0)) < 0) { + msg_warn("%s: skipping address family %d: %m", + myname, res->ai_family); + continue; + } + if (close(sock)) + msg_warn("%s: close socket: %m", myname); + + inet_addr_list_append(addr_list, res->ai_addr); + } + freeaddrinfo(res0); + } + if (hname && hname != hostname) + myfree((void *) hname); + + return (addr_list->used - initial_count); +} + +#ifdef TEST + +#include <msg.h> +#include <vstream.h> +#include <msg_vstream.h> +#include <sock_addr.h> + +int main(int argc, char **argv) +{ + INET_ADDR_LIST list; + struct sockaddr_storage *sa; + MAI_HOSTADDR_STR hostaddr; + INET_PROTO_INFO *proto_info; + + msg_vstream_init(argv[0], VSTREAM_ERR); + + if (argc < 3) + msg_fatal("usage: %s protocols hostname...", argv[0]); + + proto_info = inet_proto_init(argv[0], argv[1]); + argv += 1; + + while (--argc && *++argv) { + inet_addr_list_init(&list); + if (inet_addr_host(&list, *argv) == 0) + msg_fatal("not found: %s", *argv); + + for (sa = list.addrs; sa < list.addrs + list.used; sa++) { + SOCKADDR_TO_HOSTADDR(SOCK_ADDR_PTR(sa), SOCK_ADDR_LEN(sa), + &hostaddr, (MAI_SERVPORT_STR *) 0, 0); + vstream_printf("%s\t%s\n", *argv, hostaddr.buf); + } + vstream_fflush(VSTREAM_OUT); + inet_addr_list_free(&list); + } + return (0); +} + +#endif |