Commit | Line | Data |
---|---|---|
a61040d6 TJ |
1 | /*************************************************************************** |
2 | * Copyright (C) 2004 by Intra2net AG * | |
3 | * opensource@intra2net.com * | |
4 | * * | |
5 | * This program is free software; you can redistribute it and/or modify * | |
6 | * it under the terms of the GNU Lesser General Public License * | |
7 | * version 2.1 as published by the Free Software Foundation; * | |
8 | * * | |
9 | ***************************************************************************/ | |
10 | ||
b604d48c | 11 | #include <limits.h> |
322f2b5b TJ |
12 | #include <sys/types.h> |
13 | #include <sys/socket.h> | |
322f2b5b | 14 | |
49ba8949 TJ |
15 | #include <netinet/in.h> |
16 | #include <linux/if.h> | |
17 | #include <linux/netfilter_ipv4/ip_tables.h> | |
322f2b5b TJ |
18 | #include <ipt_ACCOUNT_cl.h> |
19 | ||
95ad024f TJ |
20 | #include <string.h> |
21 | #include <stdlib.h> | |
22 | ||
322f2b5b TJ |
23 | int ipt_ACCOUNT_init(struct ipt_ACCOUNT_context *ctx) |
24 | { | |
25 | memset (ctx, 0, sizeof(struct ipt_ACCOUNT_context)); | |
a92b7b94 | 26 | ctx->handle.handle_nr = -1; |
322f2b5b TJ |
27 | |
28 | ctx->sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); | |
e3ccc02f | 29 | if (ctx->sockfd < 0) { |
322f2b5b | 30 | ctx->sockfd = -1; |
e3ccc02f TJ |
31 | ctx->error_str = "Can't open socket to kernel. " |
32 | "Permission denied or ipt_ACCOUNT module not loaded"; | |
322f2b5b TJ |
33 | return -1; |
34 | } | |
35 | ||
36 | // 4096 bytes default buffer should save us from reallocations | |
37 | // as it fits 200 concurrent active clients | |
e3ccc02f | 38 | if((ctx->data = (void *)malloc(IPT_ACCOUNT_MIN_BUFSIZE)) == NULL) { |
322f2b5b TJ |
39 | close (ctx->sockfd); |
40 | ctx->sockfd = -1; | |
41 | ctx->error_str = "Out of memory for data buffer"; | |
42 | return -1; | |
43 | } | |
44 | ctx->data_size = IPT_ACCOUNT_MIN_BUFSIZE; | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | void ipt_ACCOUNT_free_entries(struct ipt_ACCOUNT_context *ctx) | |
50 | { | |
e3ccc02f TJ |
51 | if (ctx->handle.handle_nr != -1) { |
52 | setsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_SET_ACCOUNT_HANDLE_FREE, | |
53 | &ctx->handle, sizeof (struct ipt_acc_handle_sockopt)); | |
322f2b5b TJ |
54 | ctx->handle.handle_nr = -1; |
55 | } | |
56 | ||
57 | ctx->handle.itemcount = 0; | |
58 | ctx->pos = 0; | |
59 | } | |
60 | ||
61 | void ipt_ACCOUNT_deinit(struct ipt_ACCOUNT_context *ctx) | |
62 | { | |
63 | free(ctx->data); | |
64 | ctx->data = NULL; | |
65 | ||
66 | ipt_ACCOUNT_free_entries(ctx); | |
67 | ||
68 | close(ctx->sockfd); | |
69 | ctx->sockfd =-1; | |
70 | } | |
71 | ||
e3ccc02f TJ |
72 | int ipt_ACCOUNT_read_entries(struct ipt_ACCOUNT_context *ctx, |
73 | const char *table, char dont_flush) | |
322f2b5b | 74 | { |
8721821e | 75 | unsigned int s = sizeof (struct ipt_acc_handle_sockopt); |
28ea7aa8 | 76 | unsigned int new_size; |
322f2b5b TJ |
77 | int rtn; |
78 | ||
79 | strncpy(ctx->handle.name, table, ACCOUNT_TABLE_NAME_LEN-1); | |
80 | ||
81 | // Get table information | |
82 | if (!dont_flush) | |
e3ccc02f TJ |
83 | rtn = getsockopt(ctx->sockfd, IPPROTO_IP, |
84 | IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH, &ctx->handle, &s); | |
322f2b5b | 85 | else |
e3ccc02f TJ |
86 | rtn = getsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_GET_ACCOUNT_PREPARE_READ, |
87 | &ctx->handle, &s); | |
322f2b5b | 88 | |
e3ccc02f TJ |
89 | if (rtn < 0) { |
90 | ctx->error_str = "Can't get table information from kernel. " | |
91 | "Is the table existing?"; | |
322f2b5b TJ |
92 | return -1; |
93 | } | |
94 | ||
95 | // Check data buffer size | |
96 | ctx->pos = 0; | |
e3ccc02f | 97 | new_size = ctx->handle.itemcount * sizeof(struct ipt_acc_handle_ip); |
322f2b5b TJ |
98 | // We want to prevent reallocations all the time |
99 | if (new_size < IPT_ACCOUNT_MIN_BUFSIZE) | |
100 | new_size = IPT_ACCOUNT_MIN_BUFSIZE; | |
101 | ||
102 | // Reallocate if it's too small or twice as big | |
e3ccc02f | 103 | if (ctx->data_size < new_size || ctx->data_size > new_size*2) { |
322f2b5b TJ |
104 | // Free old buffer |
105 | free (ctx->data); | |
106 | ctx->data_size = 0; | |
107 | ||
e3ccc02f | 108 | if ((ctx->data = (void*)malloc(new_size)) == NULL) { |
322f2b5b TJ |
109 | ctx->error_str = "Out of memory for data buffer"; |
110 | ipt_ACCOUNT_free_entries(ctx); | |
111 | return -1; | |
112 | } | |
113 | ||
114 | ctx->data_size = new_size; | |
115 | } | |
116 | ||
117 | // Copy data from kernel | |
8721821e | 118 | memcpy(ctx->data, &ctx->handle, sizeof(struct ipt_acc_handle_sockopt)); |
e3ccc02f TJ |
119 | rtn = getsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_GET_ACCOUNT_GET_DATA, |
120 | ctx->data, &ctx->data_size); | |
121 | if (rtn < 0) { | |
122 | ctx->error_str = "Can't get data from kernel. " | |
123 | "Check /var/log/messages for details."; | |
322f2b5b TJ |
124 | ipt_ACCOUNT_free_entries(ctx); |
125 | return -1; | |
126 | } | |
127 | ||
128 | // Free kernel handle but don't reset pos/itemcount | |
e3ccc02f TJ |
129 | setsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_SET_ACCOUNT_HANDLE_FREE, |
130 | &ctx->handle, sizeof (struct ipt_acc_handle_sockopt)); | |
322f2b5b TJ |
131 | ctx->handle.handle_nr = -1; |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
8721821e | 136 | struct ipt_acc_handle_ip *ipt_ACCOUNT_get_next_entry(struct ipt_ACCOUNT_context *ctx) |
322f2b5b | 137 | { |
8721821e | 138 | struct ipt_acc_handle_ip *rtn; |
322f2b5b TJ |
139 | |
140 | // Empty or no more items left to return? | |
141 | if (!ctx->handle.itemcount || ctx->pos >= ctx->handle.itemcount) | |
142 | return NULL; | |
143 | ||
144 | // Get next entry | |
e3ccc02f TJ |
145 | rtn = (struct ipt_acc_handle_ip *)(ctx->data + ctx->pos |
146 | * sizeof(struct ipt_acc_handle_ip)); | |
322f2b5b TJ |
147 | ctx->pos++; |
148 | ||
149 | return rtn; | |
150 | } | |
d7e0bb9c TJ |
151 | |
152 | int ipt_ACCOUNT_get_handle_usage(struct ipt_ACCOUNT_context *ctx) | |
153 | { | |
8721821e | 154 | unsigned int s = sizeof (struct ipt_acc_handle_sockopt); |
e3ccc02f TJ |
155 | if (getsockopt(ctx->sockfd, IPPROTO_IP, |
156 | IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE, &ctx->handle, &s) < 0) { | |
d7e0bb9c TJ |
157 | ctx->error_str = "Can't get handle usage information from kernel"; |
158 | return -1; | |
159 | } | |
a92b7b94 | 160 | ctx->handle.handle_nr = -1; |
d7e0bb9c TJ |
161 | |
162 | return ctx->handle.itemcount; | |
163 | } | |
164 | ||
165 | int ipt_ACCOUNT_free_all_handles(struct ipt_ACCOUNT_context *ctx) | |
166 | { | |
e3ccc02f TJ |
167 | if (setsockopt(ctx->sockfd, IPPROTO_IP, |
168 | IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL, NULL, 0) < 0) { | |
d7e0bb9c TJ |
169 | ctx->error_str = "Can't free all kernel handles"; |
170 | return -1; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | int ipt_ACCOUNT_get_table_names(struct ipt_ACCOUNT_context *ctx) | |
177 | { | |
e3ccc02f TJ |
178 | int rtn = getsockopt(ctx->sockfd, IPPROTO_IP, |
179 | IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES, | |
180 | ctx->data, &ctx->data_size); | |
181 | if (rtn < 0) { | |
182 | ctx->error_str = "Can't get table names from kernel. Out of memory, " | |
183 | "MINBUFISZE too small?"; | |
d7e0bb9c TJ |
184 | return -1; |
185 | } | |
186 | ctx->pos = 0; | |
187 | return 0; | |
188 | } | |
189 | ||
42b9e9f8 | 190 | const char *ipt_ACCOUNT_get_next_name(struct ipt_ACCOUNT_context *ctx) |
d7e0bb9c | 191 | { |
28ea7aa8 | 192 | const char *rtn; |
8721821e TJ |
193 | if (((char *)ctx->data)[ctx->pos] == 0) |
194 | return 0; | |
d7e0bb9c | 195 | |
28ea7aa8 | 196 | rtn = ctx->data + ctx->pos; |
d7e0bb9c TJ |
197 | ctx->pos += strlen(ctx->data+ctx->pos) + 1; |
198 | ||
199 | return rtn; | |
200 | } |