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-rw-r--r--networking/udhcp/script.c283
1 files changed, 0 insertions, 283 deletions
diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
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1/* vi: set sw=4 ts=4: */
2/* script.c
3 *
4 * Functions to call the DHCP client notification scripts
5 *
6 * Russ Dill <Russ.Dill@asu.edu> July 2001
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 */
10
11#include "common.h"
12#include "dhcpc.h"
13#include "options.h"
14
15
16/* get a rough idea of how long an option will be (rounding up...) */
17static const uint8_t len_of_option_as_string[] = {
18 [OPTION_IP] = sizeof("255.255.255.255 "),
19 [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
20 [OPTION_STATIC_ROUTES]= sizeof("255.255.255.255/32 255.255.255.255 "),
21 [OPTION_STRING] = 1,
22#if ENABLE_FEATURE_UDHCP_RFC3397
23 [OPTION_STR1035] = 1,
24#endif
25 [OPTION_BOOLEAN] = sizeof("yes "),
26 [OPTION_U8] = sizeof("255 "),
27 [OPTION_U16] = sizeof("65535 "),
28 [OPTION_S16] = sizeof("-32768 "),
29 [OPTION_U32] = sizeof("4294967295 "),
30 [OPTION_S32] = sizeof("-2147483684 "),
31};
32
33
34/* note: ip is a pointer to an IP in network order, possibly misaliged */
35static int sprint_nip(char *dest, const char *pre, const uint8_t *ip)
36{
37 return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]);
38}
39
40
41/* really simple implementation, just count the bits */
42static int mton(uint32_t mask)
43{
44 int i = 0;
45 mask = ntohl(mask); /* 111110000-like bit pattern */
46 while (mask) {
47 i++;
48 mask <<= 1;
49 }
50 return i;
51}
52
53
54/* Create "opt_name=opt_value" string */
55static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name)
56{
57 unsigned upper_length;
58 int len, type, optlen;
59 uint16_t val_u16;
60 int16_t val_s16;
61 uint32_t val_u32;
62 int32_t val_s32;
63 char *dest, *ret;
64
65 /* option points to OPT_DATA, need to go back and get OPT_LEN */
66 len = option[OPT_LEN - OPT_DATA];
67 type = type_p->flags & OPTION_TYPE_MASK;
68 optlen = dhcp_option_lengths[type];
69 upper_length = len_of_option_as_string[type] * (len / optlen);
70
71 dest = ret = xmalloc(upper_length + strlen(opt_name) + 2);
72 dest += sprintf(ret, "%s=", opt_name);
73
74 while (len >= optlen) {
75 switch (type) {
76 case OPTION_IP_PAIR:
77 dest += sprint_nip(dest, "", option);
78 *dest++ = '/';
79 option += 4;
80 optlen = 4;
81 case OPTION_IP:
82 dest += sprint_nip(dest, "", option);
83// TODO: it can be a list only if (type_p->flags & OPTION_LIST).
84// Should we bail out/warn if we see multi-ip option which is
85// not allowed to be such? For example, DHCP_BROADCAST...
86 break;
87 case OPTION_BOOLEAN:
88 dest += sprintf(dest, *option ? "yes" : "no");
89 break;
90 case OPTION_U8:
91 dest += sprintf(dest, "%u", *option);
92 break;
93 case OPTION_U16:
94 move_from_unaligned16(val_u16, option);
95 dest += sprintf(dest, "%u", ntohs(val_u16));
96 break;
97 case OPTION_S16:
98 move_from_unaligned16(val_s16, option);
99 dest += sprintf(dest, "%d", ntohs(val_s16));
100 break;
101 case OPTION_U32:
102 move_from_unaligned32(val_u32, option);
103 dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32));
104 break;
105 case OPTION_S32:
106 move_from_unaligned32(val_s32, option);
107 dest += sprintf(dest, "%ld", (long) ntohl(val_s32));
108 break;
109 case OPTION_STRING:
110 memcpy(dest, option, len);
111 dest[len] = '\0';
112 return ret; /* Short circuit this case */
113 case OPTION_STATIC_ROUTES: {
114 /* Option binary format:
115 * mask [one byte, 0..32]
116 * ip [big endian, 0..4 bytes depending on mask]
117 * router [big endian, 4 bytes]
118 * may be repeated
119 *
120 * We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2"
121 */
122 const char *pfx = "";
123
124 while (len >= 1 + 4) { /* mask + 0-byte ip + router */
125 uint32_t nip;
126 uint8_t *p;
127 unsigned mask;
128 int bytes;
129
130 mask = *option++;
131 if (mask > 32)
132 break;
133 len--;
134
135 nip = 0;
136 p = (void*) &nip;
137 bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */
138 while (--bytes >= 0) {
139 *p++ = *option++;
140 len--;
141 }
142 if (len < 4)
143 break;
144
145 /* print ip/mask */
146 dest += sprint_nip(dest, pfx, (void*) &nip);
147 pfx = " ";
148 dest += sprintf(dest, "/%u ", mask);
149 /* print router */
150 dest += sprint_nip(dest, "", option);
151 option += 4;
152 len -= 4;
153 }
154
155 return ret;
156 }
157#if ENABLE_FEATURE_UDHCP_RFC3397
158 case OPTION_STR1035:
159 /* unpack option into dest; use ret for prefix (i.e., "optname=") */
160 dest = dname_dec(option, len, ret);
161 if (dest) {
162 free(ret);
163 return dest;
164 }
165 /* error. return "optname=" string */
166 return ret;
167#endif
168 }
169 option += optlen;
170 len -= optlen;
171 if (len <= 0)
172 break;
173 *dest++ = ' ';
174 *dest = '\0';
175 }
176 return ret;
177}
178
179
180/* put all the parameters into the environment */
181static char **fill_envp(struct dhcp_packet *packet)
182{
183 int num_options = 0;
184 int i;
185 char **envp, **curr;
186 const char *opt_name;
187 uint8_t *temp;
188 uint8_t over = 0;
189
190 if (packet) {
191 for (i = 0; dhcp_options[i].code; i++) {
192 if (get_option(packet, dhcp_options[i].code)) {
193 num_options++;
194 if (dhcp_options[i].code == DHCP_SUBNET)
195 num_options++; /* for mton */
196 }
197 }
198 if (packet->siaddr_nip)
199 num_options++;
200 temp = get_option(packet, DHCP_OPTION_OVERLOAD);
201 if (temp)
202 over = *temp;
203 if (!(over & FILE_FIELD) && packet->file[0])
204 num_options++;
205 if (!(over & SNAME_FIELD) && packet->sname[0])
206 num_options++;
207 }
208
209 curr = envp = xzalloc(sizeof(char *) * (num_options + 3));
210 *curr = xasprintf("interface=%s", client_config.interface);
211 putenv(*curr++);
212
213 if (packet == NULL)
214 return envp;
215
216 *curr = xmalloc(sizeof("ip=255.255.255.255"));
217 sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr);
218 putenv(*curr++);
219
220 opt_name = dhcp_option_strings;
221 i = 0;
222 while (*opt_name) {
223 temp = get_option(packet, dhcp_options[i].code);
224 if (!temp)
225 goto next;
226 *curr = xmalloc_optname_optval(temp, &dhcp_options[i], opt_name);
227 putenv(*curr++);
228
229 /* Fill in a subnet bits option for things like /24 */
230 if (dhcp_options[i].code == DHCP_SUBNET) {
231 uint32_t subnet;
232 move_from_unaligned32(subnet, temp);
233 *curr = xasprintf("mask=%d", mton(subnet));
234 putenv(*curr++);
235 }
236 next:
237 opt_name += strlen(opt_name) + 1;
238 i++;
239 }
240 if (packet->siaddr_nip) {
241 *curr = xmalloc(sizeof("siaddr=255.255.255.255"));
242 sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip);
243 putenv(*curr++);
244 }
245 if (!(over & FILE_FIELD) && packet->file[0]) {
246 /* watch out for invalid packets */
247 *curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file);
248 putenv(*curr++);
249 }
250 if (!(over & SNAME_FIELD) && packet->sname[0]) {
251 /* watch out for invalid packets */
252 *curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname);
253 putenv(*curr++);
254 }
255 return envp;
256}
257
258
259/* Call a script with a par file and env vars */
260void FAST_FUNC udhcp_run_script(struct dhcp_packet *packet, const char *name)
261{
262 char **envp, **curr;
263 char *argv[3];
264
265 if (client_config.script == NULL)
266 return;
267
268 envp = fill_envp(packet);
269
270 /* call script */
271 log1("Executing %s %s", client_config.script, name);
272 argv[0] = (char*) client_config.script;
273 argv[1] = (char*) name;
274 argv[2] = NULL;
275 spawn_and_wait(argv);
276
277 for (curr = envp; *curr; curr++) {
278 log2(" %s", *curr);
279 bb_unsetenv(*curr);
280 free(*curr);
281 }
282 free(envp);
283}
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