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Diffstat (limited to 'src/ip_direction_index.c')
| -rw-r--r-- | src/ip_direction_index.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/ip_direction_index.c b/src/ip_direction_index.c new file mode 100644 index 0000000..bfe92fe --- /dev/null +++ b/src/ip_direction_index.c @@ -0,0 +1,171 @@ +/* + * Copyright (c) 2008-2024 OARC, Inc. + * Copyright (c) 2007-2008, Internet Systems Consortium, Inc. + * Copyright (c) 2003-2007, The Measurement Factory, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. Neither the name of the copyright holder nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include "ip_direction_index.h" +#include "xmalloc.h" +#include "inX_addr.h" +#include "syslog_debug.h" + +#include <stdlib.h> +#include <string.h> + +#define LARGEST 2 + +struct _foo { + inX_addr addr; + inX_addr mask; + struct _foo* next; +}; + +static struct _foo* local_addrs = NULL; + +#ifndef DROP_RECV_RESPONSE +static +#endif + int + ip_is_local(const inX_addr* a) +{ + struct _foo* t; + for (t = local_addrs; t; t = t->next) { + inX_addr m = inXaddr_mask(a, &(t->mask)); + if (!inXaddr_cmp(&(t->addr), &m)) { + return 1; + } + } + return 0; +} + +int ip_direction_indexer(const dns_message* m) +{ + const transport_message* tm = m->tm; + if (ip_is_local(&tm->src_ip_addr)) + return 0; + if (ip_is_local(&tm->dst_ip_addr)) + return 1; + return LARGEST; +} + +int ip_local_address(const char* presentation, const char* mask) +{ + struct _foo* n = xcalloc(1, sizeof(*n)); + if (NULL == n) + return 0; + if (inXaddr_pton(presentation, &n->addr) != 1) { + dfprintf(0, "yucky IP address %s", presentation); + xfree(n); + return 0; + } + memset(&(n->mask), 255, sizeof(n->mask)); + if (mask) { + if (!strchr(mask, '.') && !strchr(mask, ':')) { + in_addr_t bit_mask = -1; + int bits = atoi(mask); + + if (strchr(presentation, ':')) { + if (bits < 0 || bits > 128) { + dfprintf(0, "yucky IP mask bits %s", mask); + xfree(n); + return 0; + } + + if (bits > 96) { + bit_mask <<= 128 - bits; + n->mask.in6.s6_addr32[3] = htonl(bit_mask); + } else { + n->mask.in6.s6_addr32[3] = 0; + if (bits > 64) { + bit_mask <<= 96 - bits; + n->mask.in6.s6_addr32[2] = htonl(bit_mask); + } else { + n->mask.in6.s6_addr32[2] = 0; + if (bits > 32) { + bit_mask <<= 64 - bits; + n->mask.in6.s6_addr32[1] = htonl(bit_mask); + } else { + n->mask.in6.s6_addr32[1] = 0; + if (bits) { + bit_mask <<= 32 - bits; + n->mask.in6.s6_addr32[0] = htonl(bit_mask); + } else { + n->mask.in6.s6_addr32[0] = 0; + } + } + } + } + } else { + if (bits < 0 || bits > 32) { + dfprintf(0, "yucky IP mask bits %s", mask); + xfree(n); + return 0; + } + + if (bits) { + bit_mask <<= 32 - bits; + n->mask.in4.s_addr = htonl(bit_mask); + } else { + n->mask.in4.s_addr = 0; + } + } + } else if (inXaddr_pton(mask, &n->mask) != 1) { + dfprintf(0, "yucky IP mask %s", mask); + xfree(n); + return 0; + } + } + n->next = local_addrs; + local_addrs = n; + return 1; +} + +int ip_direction_iterator(const char** label) +{ + static int next_iter = 0; + if (NULL == label) { + next_iter = 0; + return LARGEST + 1; + } + if (0 == next_iter) + *label = "sent"; + else if (1 == next_iter) + *label = "recv"; + else if (LARGEST == next_iter) + *label = "else"; + else + return -1; + return next_iter++; +} |