Contents of /trunk/mkinitrd-magellan/klibc/usr/kinit/ipconfig/dhcp_proto.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 4737 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* |
2 | * DHCP RFC 2131 and 2132 |
3 | */ |
4 | #include <sys/types.h> |
5 | #include <sys/uio.h> |
6 | #include <netinet/in.h> |
7 | #include <stdio.h> |
8 | #include <string.h> |
9 | #include <time.h> |
10 | |
11 | #include "ipconfig.h" |
12 | #include "netdev.h" |
13 | #include "bootp_packet.h" |
14 | #include "bootp_proto.h" |
15 | #include "dhcp_proto.h" |
16 | #include "packet.h" |
17 | |
18 | static uint8_t dhcp_params[] = { |
19 | 1, /* subnet mask */ |
20 | 3, /* default gateway */ |
21 | 6, /* DNS server */ |
22 | 12, /* host name */ |
23 | 15, /* domain name */ |
24 | 17, /* root path */ |
25 | 26, /* interface mtu */ |
26 | 28, /* broadcast addr */ |
27 | 40, /* NIS domain name (why?) */ |
28 | }; |
29 | |
30 | static uint8_t dhcp_discover_hdr[] = { |
31 | 99, 130, 83, 99, /* bootp cookie */ |
32 | 53, 1, DHCPDISCOVER, /* dhcp message type */ |
33 | 55, sizeof(dhcp_params), /* parameter list */ |
34 | }; |
35 | |
36 | static uint8_t dhcp_request_hdr[] = { |
37 | 99, 130, 83, 99, /* boot cookie */ |
38 | 53, 1, DHCPREQUEST, /* dhcp message type */ |
39 | #define SERVER_IP_OFF 9 |
40 | 54, 4, 0, 0, 0, 0, /* server IP */ |
41 | #define REQ_IP_OFF 15 |
42 | 50, 4, 0, 0, 0, 0, /* requested IP address */ |
43 | 55, sizeof(dhcp_params), /* parameter list */ |
44 | }; |
45 | |
46 | static uint8_t dhcp_end[] = { |
47 | 255, |
48 | }; |
49 | |
50 | /* Both iovecs below have to have the same structure, since dhcp_send() |
51 | pokes at the internals */ |
52 | #define DHCP_IOV_LEN 6 |
53 | |
54 | static struct iovec dhcp_discover_iov[] = { |
55 | /* [0] = ip + udp header */ |
56 | /* [1] = bootp header */ |
57 | [2] = {dhcp_discover_hdr, sizeof(dhcp_discover_hdr)}, |
58 | [3] = {dhcp_params, sizeof(dhcp_params)}, |
59 | /* [4] = DHCP vendor class */ |
60 | [5] = {dhcp_end, sizeof(dhcp_end)} |
61 | }; |
62 | |
63 | static struct iovec dhcp_request_iov[] = { |
64 | /* [0] = ip + udp header */ |
65 | /* [1] = bootp header */ |
66 | [2] = {dhcp_request_hdr, sizeof(dhcp_request_hdr)}, |
67 | [3] = {dhcp_params, sizeof(dhcp_params)}, |
68 | /* [4] = DHCP vendor class */ |
69 | [5] = {dhcp_end, sizeof(dhcp_end)} |
70 | }; |
71 | |
72 | /* |
73 | * Parse a DHCP response packet |
74 | */ |
75 | static int |
76 | dhcp_parse(struct netdev *dev, struct bootp_hdr *hdr, uint8_t * exts, int extlen) |
77 | { |
78 | uint8_t type = 0; |
79 | uint32_t serverid = INADDR_NONE; |
80 | int ret = 0; |
81 | |
82 | if (extlen >= 4 && exts[0] == 99 && exts[1] == 130 && |
83 | exts[2] == 83 && exts[3] == 99) { |
84 | uint8_t *ext; |
85 | |
86 | for (ext = exts + 4; ext - exts < extlen;) { |
87 | uint8_t len, *opt = ext++; |
88 | if (*opt == 0) |
89 | continue; |
90 | |
91 | len = *ext++; |
92 | |
93 | ext += len; |
94 | |
95 | if (*opt == 53) |
96 | type = opt[2]; |
97 | if (*opt == 54) |
98 | memcpy(&serverid, opt + 2, 4); |
99 | } |
100 | } |
101 | |
102 | switch (type) { |
103 | case DHCPOFFER: |
104 | ret = bootp_parse(dev, hdr, exts, extlen); |
105 | if (ret == 1 && serverid != INADDR_NONE) |
106 | dev->serverid = serverid; |
107 | DEBUG(("\n dhcp offer\n")); |
108 | break; |
109 | |
110 | case DHCPACK: |
111 | ret = bootp_parse(dev, hdr, exts, extlen); |
112 | DEBUG(("\n dhcp ack\n")); |
113 | break; |
114 | |
115 | case DHCPNAK: |
116 | ret = 2; |
117 | DEBUG(("\n dhcp nak\n")); |
118 | break; |
119 | } |
120 | return ret; |
121 | } |
122 | |
123 | /* |
124 | * Receive and parse a DHCP packet |
125 | */ |
126 | static int dhcp_recv(struct netdev *dev) |
127 | { |
128 | struct bootp_hdr bootp; |
129 | uint8_t dhcp_options[1500]; |
130 | struct iovec iov[] = { |
131 | /* [0] = ip + udp header */ |
132 | [1] = {&bootp, sizeof(struct bootp_hdr)}, |
133 | [2] = {dhcp_options, sizeof(dhcp_options)} |
134 | }; |
135 | int ret; |
136 | |
137 | ret = packet_recv(iov, 3); |
138 | if (ret <= 0) |
139 | return ret; |
140 | |
141 | DEBUG(("\n dhcp xid %08x ", dev->bootp.xid)); |
142 | |
143 | if (ret < sizeof(struct bootp_hdr) || bootp.op != BOOTP_REPLY || /* RFC951 7.5 */ |
144 | bootp.xid != dev->bootp.xid || |
145 | memcmp(bootp.chaddr, dev->hwaddr, 16)) |
146 | return 0; |
147 | |
148 | ret -= sizeof(struct bootp_hdr); |
149 | |
150 | return dhcp_parse(dev, &bootp, dhcp_options, ret); |
151 | } |
152 | |
153 | static int dhcp_send(struct netdev *dev, struct iovec *vec) |
154 | { |
155 | struct bootp_hdr bootp; |
156 | |
157 | memset(&bootp, 0, sizeof(struct bootp_hdr)); |
158 | |
159 | bootp.op = BOOTP_REQUEST; |
160 | bootp.htype = dev->hwtype; |
161 | bootp.hlen = dev->hwlen; |
162 | bootp.xid = dev->bootp.xid; |
163 | bootp.ciaddr = dev->ip_addr; |
164 | bootp.giaddr = dev->bootp.gateway; |
165 | bootp.secs = htons(time(NULL) - dev->open_time); |
166 | memcpy(bootp.chaddr, dev->hwaddr, 16); |
167 | |
168 | vec[1].iov_base = &bootp; |
169 | vec[1].iov_len = sizeof(struct bootp_hdr); |
170 | |
171 | vec[4].iov_base = vendor_class_identifier; |
172 | vec[4].iov_len = vendor_class_identifier_len; |
173 | |
174 | DEBUG(("xid %08x secs %d ", bootp.xid, ntohs(bootp.secs))); |
175 | |
176 | return packet_send(dev, vec, DHCP_IOV_LEN); |
177 | } |
178 | |
179 | /* |
180 | * Send a DHCP discover packet |
181 | */ |
182 | int dhcp_send_discover(struct netdev *dev) |
183 | { |
184 | dev->ip_addr = INADDR_ANY; |
185 | dev->ip_gateway = INADDR_ANY; |
186 | |
187 | DEBUG(("-> dhcp discover ")); |
188 | |
189 | return dhcp_send(dev, dhcp_discover_iov); |
190 | } |
191 | |
192 | /* |
193 | * Receive a DHCP offer packet |
194 | */ |
195 | int dhcp_recv_offer(struct netdev *dev) |
196 | { |
197 | return dhcp_recv(dev); |
198 | } |
199 | |
200 | /* |
201 | * Send a DHCP request packet |
202 | */ |
203 | int dhcp_send_request(struct netdev *dev) |
204 | { |
205 | memcpy(&dhcp_request_hdr[SERVER_IP_OFF], &dev->serverid, 4); |
206 | memcpy(&dhcp_request_hdr[REQ_IP_OFF], &dev->ip_addr, 4); |
207 | |
208 | DEBUG(("-> dhcp request ")); |
209 | |
210 | return dhcp_send(dev, dhcp_request_iov); |
211 | } |
212 | |
213 | /* |
214 | * Receive a DHCP ack packet |
215 | */ |
216 | int dhcp_recv_ack(struct netdev *dev) |
217 | { |
218 | return dhcp_recv(dev); |
219 | } |