444 lines
7.7 KiB
C
444 lines
7.7 KiB
C
#include "ipf.h"
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#include "netinet/ipl.h"
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#include "ipmon.h"
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#include <ctype.h>
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#define IPF_ENTERPRISE 9932
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/*
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* Enterprise number OID:
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* 1.3.6.1.4.1.9932
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*/
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static u_char ipf_enterprise[] = { 6, 7, 0x2b, 6, 1, 4, 1, 0xcd, 0x4c };
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static u_char ipf_trap0_1[] = { 6, 10, 0x2b, 6, 1, 4, 1, 0xcd, 0x4c, 1, 1, 1 };
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static u_char ipf_trap0_2[] = { 6, 10, 0x2b, 6, 1, 4, 1, 0xcd, 0x4c, 1, 1, 2 };
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static int writeint(u_char *, int);
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static int writelength(u_char *, u_int);
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static int maketrap_v1(char *, u_char *, int, u_char *, int, u_32_t,
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time_t);
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static void snmpv1_destroy(void *);
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static void *snmpv1_dup(void *);
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static int snmpv1_match(void *, void *);
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static void *snmpv1_parse(char **);
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static void snmpv1_print(void *);
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static int snmpv1_send(void *, ipmon_msg_t *);
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typedef struct snmpv1_opts_s {
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char *community;
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int fd;
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int v6;
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int ref;
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#ifdef USE_INET6
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struct sockaddr_in6 sin6;
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#endif
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struct sockaddr_in sin;
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} snmpv1_opts_t;
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ipmon_saver_t snmpv1saver = {
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"snmpv1",
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snmpv1_destroy,
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snmpv1_dup, /* dup */
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snmpv1_match, /* match */
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snmpv1_parse,
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snmpv1_print,
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snmpv1_send
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};
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static int
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snmpv1_match(void *ctx1, void *ctx2)
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{
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snmpv1_opts_t *s1 = ctx1, *s2 = ctx2;
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if (s1->v6 != s2->v6)
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return(1);
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if (strcmp(s1->community, s2->community))
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return(1);
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#ifdef USE_INET6
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if (s1->v6 == 1) {
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if (memcmp(&s1->sin6, &s2->sin6, sizeof(s1->sin6)))
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return(1);
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} else
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#endif
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{
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if (memcmp(&s1->sin, &s2->sin, sizeof(s1->sin)))
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return(1);
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}
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return(0);
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}
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static void *
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snmpv1_dup(void *ctx)
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{
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snmpv1_opts_t *s = ctx;
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s->ref++;
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return(s);
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}
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static void
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snmpv1_print(void *ctx)
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{
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snmpv1_opts_t *snmpv1 = ctx;
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printf("%s ", snmpv1->community);
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#ifdef USE_INET6
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if (snmpv1->v6 == 1) {
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char buf[80];
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printf("%s", inet_ntop(AF_INET6, &snmpv1->sin6.sin6_addr, buf,
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sizeof(snmpv1->sin6.sin6_addr)));
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} else
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#endif
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{
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printf("%s", inet_ntoa(snmpv1->sin.sin_addr));
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}
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}
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static void *
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snmpv1_parse(char **strings)
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{
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snmpv1_opts_t *ctx;
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int result;
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char *str;
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char *s;
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if (strings[0] == NULL || strings[0][0] == '\0')
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return(NULL);
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if (strchr(*strings, ' ') == NULL)
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return(NULL);
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str = strdup(*strings);
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ctx = calloc(1, sizeof(*ctx));
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if (ctx == NULL)
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return(NULL);
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ctx->fd = -1;
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s = strchr(str, ' ');
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*s++ = '\0';
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ctx->community = str;
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while (ISSPACE(*s))
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s++;
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if (!*s) {
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free(str);
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free(ctx);
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return(NULL);
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}
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#ifdef USE_INET6
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if (strchr(s, ':') == NULL) {
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result = inet_pton(AF_INET, s, &ctx->sin.sin_addr);
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if (result == 1) {
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ctx->fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (ctx->fd >= 0) {
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ctx->sin.sin_family = AF_INET;
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ctx->sin.sin_port = htons(162);
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if (connect(ctx->fd,
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(struct sockaddr *)&ctx->sin,
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sizeof(ctx->sin)) != 0) {
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snmpv1_destroy(ctx);
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return(NULL);
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}
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}
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}
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} else {
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result = inet_pton(AF_INET6, s, &ctx->sin6.sin6_addr);
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if (result == 1) {
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ctx->v6 = 1;
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ctx->fd = socket(AF_INET6, SOCK_DGRAM, 0);
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if (ctx->fd >= 0) {
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ctx->sin6.sin6_family = AF_INET6;
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ctx->sin6.sin6_port = htons(162);
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if (connect(ctx->fd,
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(struct sockaddr *)&ctx->sin6,
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sizeof(ctx->sin6)) != 0) {
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snmpv1_destroy(ctx);
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return(NULL);
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}
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}
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}
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}
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#else
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result = inet_aton(s, &ctx->sin.sin_addr);
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if (result == 1) {
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ctx->fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (ctx->fd >= 0) {
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ctx->sin.sin_family = AF_INET;
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ctx->sin.sin_port = htons(162);
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if (connect(ctx->fd, (struct sockaddr *)&ctx->sin,
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sizeof(ctx->sin)) != 0) {
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snmpv1_destroy(ctx);
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return(NULL);
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}
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}
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}
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#endif
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if (result != 1) {
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free(str);
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free(ctx);
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return(NULL);
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}
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ctx->ref = 1;
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return(ctx);
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}
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static void
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snmpv1_destroy(void *ctx)
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{
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snmpv1_opts_t *v1 = ctx;
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v1->ref--;
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if (v1->ref > 0)
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return;
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if (v1->community)
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free(v1->community);
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if (v1->fd >= 0)
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close(v1->fd);
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free(v1);
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}
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static int
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snmpv1_send(void *ctx, ipmon_msg_t *msg)
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{
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snmpv1_opts_t *v1 = ctx;
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return(sendtrap_v1_0(v1->fd, v1->community,
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msg->imm_msg, msg->imm_msglen, msg->imm_when));
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}
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static char def_community[] = "public"; /* ublic */
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static int
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writelength(u_char *buffer, u_int value)
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{
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u_int n = htonl(value);
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int len;
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if (value < 128) {
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*buffer = value;
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return(1);
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}
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if (value > 0xffffff)
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len = 4;
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else if (value > 0xffff)
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len = 3;
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else if (value > 0xff)
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len = 2;
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else
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len = 1;
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*buffer = 0x80 | len;
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bcopy((u_char *)&n + 4 - len, buffer + 1, len);
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return(len + 1);
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}
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static int
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writeint(u_char *buffer, int value)
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{
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u_char *s = buffer;
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u_int n = value;
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if (value == 0) {
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*buffer = 0;
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return(1);
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}
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if (n > 4194304) {
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*s++ = 0x80 | (n / 4194304);
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n -= 4194304 * (n / 4194304);
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}
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if (n > 32768) {
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*s++ = 0x80 | (n / 32768);
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n -= 32768 * (n / 327678);
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}
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if (n > 128) {
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*s++ = 0x80 | (n / 128);
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n -= (n / 128) * 128;
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}
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*s++ = (u_char)n;
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return(s - buffer);
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}
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/*
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* First style of traps is:
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* 1.3.6.1.4.1.9932.1.1
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*/
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static int
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maketrap_v1(char *community, u_char *buffer, int bufsize, u_char *msg,
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int msglen, u_32_t ipaddr, time_t when)
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{
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u_char *s = buffer, *t, *pdulen, *varlen;
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int basesize = 73;
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u_short len;
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int trapmsglen;
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int pdulensz;
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int varlensz;
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int baselensz;
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int n;
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if (community == NULL || *community == '\0')
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community = def_community;
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basesize += strlen(community) + msglen;
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if (basesize + 8 > bufsize)
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return(0);
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memset(buffer, 0xff, bufsize);
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*s++ = 0x30; /* Sequence */
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if (basesize - 1 >= 128) {
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baselensz = 2;
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basesize++;
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} else {
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baselensz = 1;
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}
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s += baselensz;
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*s++ = 0x02; /* Integer32 */
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*s++ = 0x01; /* length 1 */
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*s++ = 0x00; /* version 1 */
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*s++ = 0x04; /* octet string */
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*s++ = strlen(community); /* length of "public" */
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bcopy(community, s, s[-1]);
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s += s[-1];
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*s++ = 0xA4; /* PDU(4) */
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pdulen = s++;
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if (basesize - (s - buffer) >= 128) {
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pdulensz = 2;
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basesize++;
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s++;
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} else {
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pdulensz = 1;
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}
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/* enterprise */
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bcopy(ipf_enterprise, s, sizeof(ipf_enterprise));
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s += sizeof(ipf_enterprise);
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/* Agent address */
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*s++ = 0x40;
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*s++ = 0x4;
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bcopy(&ipaddr, s, 4);
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s += 4;
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/* Generic Trap code */
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*s++ = 0x2;
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n = writeint(s + 1, 6);
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if (n == 0)
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return(0);
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*s = n;
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s += n + 1;
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/* Specific Trap code */
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*s++ = 0x2;
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n = writeint(s + 1, 0);
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if (n == 0)
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return(0);
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*s = n;
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s += n + 1;
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/* Time stamp */
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*s++ = 0x43; /* TimeTicks */
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*s++ = 0x04; /* TimeTicks */
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s[0] = when >> 24;
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s[1] = when >> 16;
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s[2] = when >> 8;
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s[3] = when & 0xff;
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s += 4;
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/*
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* The trap0 message is "ipfilter_version" followed by the message
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*/
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*s++ = 0x30;
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varlen = s;
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if (basesize - (s - buffer) >= 128) {
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varlensz = 2;
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basesize++;
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} else {
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varlensz = 1;
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}
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s += varlensz;
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*s++ = 0x30;
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t = s + 1;
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bcopy(ipf_trap0_1, t, sizeof(ipf_trap0_1));
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t += sizeof(ipf_trap0_1);
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*t++ = 0x2; /* Integer */
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n = writeint(t + 1, IPFILTER_VERSION);
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*t = n;
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t += n + 1;
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len = t - s - 1;
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writelength(s, len);
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s = t;
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*s++ = 0x30;
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if (basesize - (s - buffer) >= 128) {
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trapmsglen = 2;
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basesize++;
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} else {
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trapmsglen = 1;
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}
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t = s + trapmsglen;
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bcopy(ipf_trap0_2, t, sizeof(ipf_trap0_2));
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t += sizeof(ipf_trap0_2);
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*t++ = 0x4; /* Octet string */
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n = writelength(t, msglen);
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t += n;
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bcopy(msg, t, msglen);
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t += msglen;
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len = t - s - trapmsglen;
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writelength(s, len);
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len = t - varlen - varlensz;
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writelength(varlen, len); /* pdu length */
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len = t - pdulen - pdulensz;
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writelength(pdulen, len); /* pdu length */
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len = t - buffer - baselensz - 1;
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writelength(buffer + 1, len); /* length of trap */
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return(t - buffer);
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}
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int
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sendtrap_v1_0(int fd, char *community, char *msg, int msglen, time_t when)
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{
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u_char buffer[1500];
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int n;
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n = maketrap_v1(community, buffer, sizeof(buffer),
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(u_char *)msg, msglen, 0, when);
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if (n > 0) {
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return(send(fd, buffer, n, 0));
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}
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return(0);
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}
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