| /* $Id: avahi.c 92 2006-04-28 21:14:09Z lennart $ */ |
| |
| /*** |
| This file is part of nss-mdns. |
| |
| nss-mdns is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| nss-mdns is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with nss-mdns; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| USA. |
| ***/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include <sys/socket.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <arpa/inet.h> |
| #include <sys/un.h> |
| #include <assert.h> |
| #include <unistd.h> |
| |
| #include "avahi.h" |
| #include "util.h" |
| |
| #define WHITESPACE " \t" |
| |
| static FILE *open_socket(void) { |
| int fd = -1; |
| struct sockaddr_un sa; |
| FILE *f = NULL; |
| |
| if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) |
| goto fail; |
| |
| set_cloexec(fd); |
| |
| memset(&sa, 0, sizeof(sa)); |
| sa.sun_family = AF_UNIX; |
| strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1); |
| sa.sun_path[sizeof(sa.sun_path)-1] = 0; |
| |
| if (connect(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) |
| goto fail; |
| |
| if (!(f = fdopen(fd, "r+"))) |
| goto fail; |
| |
| return f; |
| |
| fail: |
| if (fd >= 0) |
| close(fd); |
| |
| return NULL; |
| } |
| |
| int avahi_resolve_name(int af, const char* name, void* data) { |
| FILE *f = NULL; |
| char *p; |
| int ret = -1; |
| char ln[256]; |
| |
| if (af != AF_INET && af != AF_INET6) |
| goto finish; |
| |
| if (!(f = open_socket())) |
| goto finish; |
| |
| fprintf(f, "RESOLVE-HOSTNAME%s %s\n", af == AF_INET ? "-IPV4" : "-IPV6", name); |
| fflush(f); |
| |
| if (!(fgets(ln, sizeof(ln), f))) |
| goto finish; |
| |
| if (ln[0] != '+') { |
| ret = 1; |
| goto finish; |
| } |
| |
| p = ln+1; |
| p += strspn(p, WHITESPACE); |
| |
| /* Skip interface */ |
| p += strcspn(p, WHITESPACE); |
| p += strspn(p, WHITESPACE); |
| |
| /* Skip protocol */ |
| p += strcspn(p, WHITESPACE); |
| p += strspn(p, WHITESPACE); |
| |
| /* Skip host name */ |
| p += strcspn(p, WHITESPACE); |
| p += strspn(p, WHITESPACE); |
| |
| /* Cut off end of line */ |
| *(p + strcspn(p, "\n\r\t ")) = 0; |
| |
| if (inet_pton(af, p, data) <= 0) |
| goto finish; |
| |
| ret = 0; |
| |
| finish: |
| |
| if (f) |
| fclose(f); |
| |
| return ret; |
| } |
| |
| int avahi_resolve_address(int af, const void *data, char* name, size_t name_len) { |
| FILE *f = NULL; |
| char *p; |
| int ret = -1; |
| char a[256], ln[256]; |
| |
| if (af != AF_INET && af != AF_INET6) |
| goto finish; |
| |
| if (!(f = open_socket())) |
| goto finish; |
| |
| fprintf(f, "RESOLVE-ADDRESS %s\n", inet_ntop(af, data, a, sizeof(a))); |
| |
| if (!(fgets(ln, sizeof(ln), f))) |
| goto finish; |
| |
| if (ln[0] != '+') { |
| ret = 1; |
| goto finish; |
| } |
| |
| p = ln+1; |
| p += strspn(p, WHITESPACE); |
| |
| /* Skip interface */ |
| p += strcspn(p, WHITESPACE); |
| p += strspn(p, WHITESPACE); |
| |
| /* Skip protocol */ |
| p += strcspn(p, WHITESPACE); |
| p += strspn(p, WHITESPACE); |
| |
| /* Cut off end of line */ |
| *(p + strcspn(p, "\n\r\t ")) = 0; |
| |
| strncpy(name, p, name_len-1); |
| name[name_len-1] = 0; |
| |
| ret = 0; |
| |
| finish: |
| |
| if (f) |
| fclose(f); |
| |
| return ret; |
| } |