2 * The PCI Library -- Resolving ID's via DNS
4 * Copyright (c) 2007--2008 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
17 #include <netinet/in.h>
18 #include <arpa/nameser.h>
22 *pci_id_net_lookup(struct pci_access *a, int cat, int id1, int id2, int id3, int id4)
24 char name[256], dnsname[256], txt[256];
34 sprintf(name, "%04x", id1);
37 sprintf(name, "%04x.%04x", id2, id1);
40 sprintf(name, "%04x.%04x.%04x.%04x", id4, id3, id2, id1);
42 case ID_GEN_SUBSYSTEM:
43 sprintf(name, "%04x.%04x.s", id2, id1);
46 sprintf(name, "%02x.c", id1);
49 sprintf(name, "%02x.%02x.c", id2, id1);
52 sprintf(name, "%02x.%02x.%02x.c", id3, id2, id1);
57 sprintf(dnsname, "%s.%s", name, a->id_domain);
59 a->debug("Resolving %s\n", dnsname);
61 res = res_query(dnsname, ns_c_in, ns_t_txt, answer, sizeof(answer));
64 a->debug("\tfailed, h_errno=%d\n", _res.res_h_errno);
67 if (ns_initparse(answer, res, &m) < 0)
69 a->debug("\tinitparse failed\n");
72 for (i=0; ns_parserr(&m, ns_s_an, i, &rr) >= 0; i++)
74 a->debug("\tanswer %d (class %d, type %d)\n", i, ns_rr_class(rr), ns_rr_type(rr));
75 if (ns_rr_class(rr) != ns_c_in || ns_rr_type(rr) != ns_t_txt)
77 data = ns_rr_rdata(rr);
78 dlen = ns_rr_rdlen(rr);
80 while (j < dlen && j+1+data[j] <= dlen)
82 memcpy(txt, &data[j+1], data[j]);
85 a->debug("\t\t%s\n", txt);
86 if (txt[0] == 'i' && txt[1] == '=')
96 char *pci_id_net_lookup(struct pci_access *a UNUSED, int cat UNUSED, int id1 UNUSED, int id2 UNUSED, int id3 UNUSED, int id4 UNUSED)
104 pci_set_net_domain(struct pci_access *a, char *name, int to_be_freed)
106 if (a->free_id_domain)
109 a->free_id_domain = to_be_freed;