1 /* $OpenBSD: printconf.c,v 1.6 2023/11/25 13:00:05 florian Exp $ */
2
3 /*
4 * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
5 * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/types.h>
21 #include <sys/queue.h>
22 #include <sys/socket.h>
23 #include <sys/uio.h>
24
25 #include <net/if.h>
26
27 #include <netinet/in.h>
28 #include <netinet/if_ether.h>
29
30 #include <arpa/inet.h>
31
32 #include <event.h>
33 #include <imsg.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <vis.h>
37
38 #include "dhcpleased.h"
39 #include "log.h"
40
41 void print_dhcp_options(char *, uint8_t *, int);
42
43 void
print_dhcp_options(char * indent,uint8_t * p,int len)44 print_dhcp_options(char *indent, uint8_t *p, int len)
45 {
46 static char buf[4 * 1500 + 1];
47 int rem, i;
48 uint8_t dho, dho_len;
49
50 rem = len;
51
52 while (rem > 0) {
53 dho = *p;
54 p += 1;
55 rem -= 1;
56
57 if (rem == 0)
58 fatal("dhcp option too short");
59 dho_len = *p;
60 p += 1;
61 rem -= 1;
62 if (rem < dho_len)
63 fatal("dhcp option too short: %d %d", rem, dho_len);
64
65 switch (dho) {
66 case DHO_DHCP_CLASS_IDENTIFIER:
67 strvisx(buf, p, dho_len, VIS_DQ | VIS_CSTYLE);
68 p += dho_len;
69 rem -= dho_len;
70 printf("%ssend vendor class id \"%s\"\n", indent, buf);
71 break;
72 case DHO_DHCP_CLIENT_IDENTIFIER:
73 if (dho_len < 1)
74 fatal("dhcp option too short");
75 switch (*p) {
76 case HTYPE_ETHER:
77 printf("%ssend client id \"", indent);
78 for (i = 0; i < dho_len; i++)
79 printf("%s%02x", i != 0? ":" : "",
80 *(p + i));
81 printf("\"\n");
82 break;
83 default:
84 strvisx(buf, p, dho_len, VIS_DQ | VIS_CSTYLE);
85 printf("%ssend client id \"%s\"\n",
86 indent, buf);
87 break;
88 }
89 p += dho_len;
90 rem -= dho_len;
91 break;
92 default:
93 fatal("unknown dhcp option: %d [%d]", *p, rem);
94 break;
95 }
96 }
97 }
98
99 void
print_config(struct dhcpleased_conf * conf)100 print_config(struct dhcpleased_conf *conf)
101 {
102 struct iface_conf *iface;
103 int i;
104 char hbuf[INET_ADDRSTRLEN];
105
106 SIMPLEQ_FOREACH(iface, &conf->iface_list, entry) {
107 printf("interface %s {\n", iface->name);
108 print_dhcp_options("\t", iface->c_id, iface->c_id_len);
109 if (iface->h_name != NULL) {
110 if (iface->h_name[0] == '\0')
111 printf("\tsend no host name\n");
112 else {
113 printf("\tsend host name \"%s\"\n",
114 iface->h_name);
115 }
116 }
117 print_dhcp_options("\t", iface->vc_id, iface->vc_id_len);
118 if (iface->ignore & IGN_DNS)
119 printf("\tignore dns\n");
120 if (iface->ignore & IGN_ROUTES)
121 printf("\tignore routes\n");
122 for (i = 0; i < iface->ignore_servers_len; i++) {
123 if (inet_ntop(AF_INET, &iface->ignore_servers[i],
124 hbuf, sizeof(hbuf)) == NULL)
125 continue;
126 printf("\tignore %s\n", hbuf);
127
128 }
129 if (iface->prefer_ipv6)
130 printf("\tprefer ipv6\n");
131 printf("}\n");
132 }
133 }
134