diff options
Diffstat (limited to 'networking/udhcp/files.c')
-rw-r--r-- | networking/udhcp/files.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c deleted file mode 100644 index b22425352..000000000 --- a/networking/udhcp/files.c +++ /dev/null | |||
@@ -1,234 +0,0 @@ | |||
1 | /* vi: set sw=4 ts=4: */ | ||
2 | /* | ||
3 | * DHCP server config and lease file manipulation | ||
4 | * | ||
5 | * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001 | ||
6 | * | ||
7 | * Licensed under GPLv2, see file LICENSE in this source tree. | ||
8 | */ | ||
9 | #include <netinet/ether.h> | ||
10 | |||
11 | #include "common.h" | ||
12 | #include "dhcpd.h" | ||
13 | |||
14 | /* on these functions, make sure your datatype matches */ | ||
15 | static int FAST_FUNC read_str(const char *line, void *arg) | ||
16 | { | ||
17 | char **dest = arg; | ||
18 | |||
19 | free(*dest); | ||
20 | *dest = xstrdup(line); | ||
21 | return 1; | ||
22 | } | ||
23 | |||
24 | static int FAST_FUNC read_u32(const char *line, void *arg) | ||
25 | { | ||
26 | *(uint32_t*)arg = bb_strtou32(line, NULL, 10); | ||
27 | return errno == 0; | ||
28 | } | ||
29 | |||
30 | static int FAST_FUNC read_staticlease(const char *const_line, void *arg) | ||
31 | { | ||
32 | char *line; | ||
33 | char *mac_string; | ||
34 | char *ip_string; | ||
35 | struct ether_addr mac_bytes; /* it's "struct { uint8_t mac[6]; }" */ | ||
36 | uint32_t nip; | ||
37 | |||
38 | /* Read mac */ | ||
39 | line = (char *) const_line; | ||
40 | mac_string = strtok_r(line, " \t", &line); | ||
41 | if (!mac_string || !ether_aton_r(mac_string, &mac_bytes)) | ||
42 | return 0; | ||
43 | |||
44 | /* Read ip */ | ||
45 | ip_string = strtok_r(NULL, " \t", &line); | ||
46 | if (!ip_string || !udhcp_str2nip(ip_string, &nip)) | ||
47 | return 0; | ||
48 | |||
49 | add_static_lease(arg, (uint8_t*) &mac_bytes, nip); | ||
50 | |||
51 | log_static_leases(arg); | ||
52 | |||
53 | return 1; | ||
54 | } | ||
55 | |||
56 | |||
57 | struct config_keyword { | ||
58 | const char *keyword; | ||
59 | int (*handler)(const char *line, void *var) FAST_FUNC; | ||
60 | unsigned ofs; | ||
61 | const char *def; | ||
62 | }; | ||
63 | |||
64 | #define OFS(field) offsetof(struct server_config_t, field) | ||
65 | |||
66 | static const struct config_keyword keywords[] = { | ||
67 | /* keyword handler variable address default */ | ||
68 | {"start" , udhcp_str2nip , OFS(start_ip ), "192.168.0.20"}, | ||
69 | {"end" , udhcp_str2nip , OFS(end_ip ), "192.168.0.254"}, | ||
70 | {"interface" , read_str , OFS(interface ), "eth0"}, | ||
71 | /* Avoid "max_leases value not sane" warning by setting default | ||
72 | * to default_end_ip - default_start_ip + 1: */ | ||
73 | {"max_leases" , read_u32 , OFS(max_leases ), "235"}, | ||
74 | {"auto_time" , read_u32 , OFS(auto_time ), "7200"}, | ||
75 | {"decline_time" , read_u32 , OFS(decline_time ), "3600"}, | ||
76 | {"conflict_time", read_u32 , OFS(conflict_time), "3600"}, | ||
77 | {"offer_time" , read_u32 , OFS(offer_time ), "60"}, | ||
78 | {"min_lease" , read_u32 , OFS(min_lease_sec), "60"}, | ||
79 | {"lease_file" , read_str , OFS(lease_file ), LEASES_FILE}, | ||
80 | {"pidfile" , read_str , OFS(pidfile ), "/var/run/udhcpd.pid"}, | ||
81 | {"siaddr" , udhcp_str2nip , OFS(siaddr_nip ), "0.0.0.0"}, | ||
82 | /* keywords with no defaults must be last! */ | ||
83 | {"option" , udhcp_str2optset, OFS(options ), ""}, | ||
84 | {"opt" , udhcp_str2optset, OFS(options ), ""}, | ||
85 | {"notify_file" , read_str , OFS(notify_file ), NULL}, | ||
86 | {"sname" , read_str , OFS(sname ), NULL}, | ||
87 | {"boot_file" , read_str , OFS(boot_file ), NULL}, | ||
88 | {"static_lease" , read_staticlease, OFS(static_leases), ""}, | ||
89 | }; | ||
90 | enum { KWS_WITH_DEFAULTS = ARRAY_SIZE(keywords) - 6 }; | ||
91 | |||
92 | void FAST_FUNC read_config(const char *file) | ||
93 | { | ||
94 | parser_t *parser; | ||
95 | const struct config_keyword *k; | ||
96 | unsigned i; | ||
97 | char *token[2]; | ||
98 | |||
99 | for (i = 0; i < KWS_WITH_DEFAULTS; i++) | ||
100 | keywords[i].handler(keywords[i].def, (char*)&server_config + keywords[i].ofs); | ||
101 | |||
102 | parser = config_open(file); | ||
103 | while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) { | ||
104 | for (k = keywords, i = 0; i < ARRAY_SIZE(keywords); k++, i++) { | ||
105 | if (strcasecmp(token[0], k->keyword) == 0) { | ||
106 | if (!k->handler(token[1], (char*)&server_config + k->ofs)) { | ||
107 | bb_error_msg("can't parse line %u in %s", | ||
108 | parser->lineno, file); | ||
109 | /* reset back to the default value */ | ||
110 | k->handler(k->def, (char*)&server_config + k->ofs); | ||
111 | } | ||
112 | break; | ||
113 | } | ||
114 | } | ||
115 | } | ||
116 | config_close(parser); | ||
117 | |||
118 | server_config.start_ip = ntohl(server_config.start_ip); | ||
119 | server_config.end_ip = ntohl(server_config.end_ip); | ||
120 | } | ||
121 | |||
122 | void FAST_FUNC write_leases(void) | ||
123 | { | ||
124 | int fd; | ||
125 | unsigned i; | ||
126 | leasetime_t curr; | ||
127 | int64_t written_at; | ||
128 | |||
129 | fd = open_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC); | ||
130 | if (fd < 0) | ||
131 | return; | ||
132 | |||
133 | curr = written_at = time(NULL); | ||
134 | |||
135 | written_at = SWAP_BE64(written_at); | ||
136 | full_write(fd, &written_at, sizeof(written_at)); | ||
137 | |||
138 | for (i = 0; i < server_config.max_leases; i++) { | ||
139 | leasetime_t tmp_time; | ||
140 | |||
141 | if (g_leases[i].lease_nip == 0) | ||
142 | continue; | ||
143 | |||
144 | /* Screw with the time in the struct, for easier writing */ | ||
145 | tmp_time = g_leases[i].expires; | ||
146 | |||
147 | g_leases[i].expires -= curr; | ||
148 | if ((signed_leasetime_t) g_leases[i].expires < 0) | ||
149 | g_leases[i].expires = 0; | ||
150 | g_leases[i].expires = htonl(g_leases[i].expires); | ||
151 | |||
152 | /* No error check. If the file gets truncated, | ||
153 | * we lose some leases on restart. Oh well. */ | ||
154 | full_write(fd, &g_leases[i], sizeof(g_leases[i])); | ||
155 | |||
156 | /* Then restore it when done */ | ||
157 | g_leases[i].expires = tmp_time; | ||
158 | } | ||
159 | close(fd); | ||
160 | |||
161 | if (server_config.notify_file) { | ||
162 | char *argv[3]; | ||
163 | argv[0] = server_config.notify_file; | ||
164 | argv[1] = server_config.lease_file; | ||
165 | argv[2] = NULL; | ||
166 | spawn_and_wait(argv); | ||
167 | } | ||
168 | } | ||
169 | |||
170 | void FAST_FUNC read_leases(const char *file) | ||
171 | { | ||
172 | struct dyn_lease lease; | ||
173 | int64_t written_at, time_passed; | ||
174 | int fd; | ||
175 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 | ||
176 | unsigned i = 0; | ||
177 | #endif | ||
178 | |||
179 | fd = open_or_warn(file, O_RDONLY); | ||
180 | if (fd < 0) | ||
181 | return; | ||
182 | |||
183 | if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at)) | ||
184 | goto ret; | ||
185 | written_at = SWAP_BE64(written_at); | ||
186 | |||
187 | time_passed = time(NULL) - written_at; | ||
188 | /* Strange written_at, or lease file from old version of udhcpd | ||
189 | * which had no "written_at" field? */ | ||
190 | if ((uint64_t)time_passed > 12 * 60 * 60) | ||
191 | goto ret; | ||
192 | |||
193 | while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) { | ||
194 | uint32_t y = ntohl(lease.lease_nip); | ||
195 | if (y >= server_config.start_ip && y <= server_config.end_ip) { | ||
196 | signed_leasetime_t expires = ntohl(lease.expires) - (signed_leasetime_t)time_passed; | ||
197 | uint32_t static_nip; | ||
198 | |||
199 | if (expires <= 0) | ||
200 | /* We keep expired leases: add_lease() will add | ||
201 | * a lease with 0 seconds remaining. | ||
202 | * Fewer IP address changes this way for mass reboot scenario. | ||
203 | */ | ||
204 | expires = 0; | ||
205 | |||
206 | /* Check if there is a different static lease for this IP or MAC */ | ||
207 | static_nip = get_static_nip_by_mac(server_config.static_leases, lease.lease_mac); | ||
208 | if (static_nip) { | ||
209 | /* NB: we do not add lease even if static_nip == lease.lease_nip. | ||
210 | */ | ||
211 | continue; | ||
212 | } | ||
213 | if (is_nip_reserved(server_config.static_leases, lease.lease_nip)) | ||
214 | continue; | ||
215 | |||
216 | /* NB: add_lease takes "relative time", IOW, | ||
217 | * lease duration, not lease deadline. */ | ||
218 | if (add_lease(lease.lease_mac, lease.lease_nip, | ||
219 | expires, | ||
220 | lease.hostname, sizeof(lease.hostname) | ||
221 | ) == 0 | ||
222 | ) { | ||
223 | bb_error_msg("too many leases while loading %s", file); | ||
224 | break; | ||
225 | } | ||
226 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 | ||
227 | i++; | ||
228 | #endif | ||
229 | } | ||
230 | } | ||
231 | log1("read %d leases", i); | ||
232 | ret: | ||
233 | close(fd); | ||
234 | } | ||