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