2 * (C)opyright 1995-1998 Darren Reed. (from tcplog)
4 * See the IPFILTER.LICENCE file for details on licencing.
12 #include <sys/types.h>
13 #include <sys/param.h>
16 #include <sys/timeb.h>
17 #include <sys/socket.h>
19 #include <sys/ioctl.h>
21 #include <sys/fcntlcom.h>
27 #include <netinet/in.h>
28 #include <netinet/in_systm.h>
29 #include <netinet/ip.h>
30 #include <netinet/if_ether.h>
31 #include <netinet/ip_var.h>
32 #include <netinet/udp.h>
33 #include <netinet/udp_var.h>
34 #include <netinet/tcp.h>
35 #include <netinet/tcpip.h>
36 #include "ip_compat.h"
39 static char sbpf[] = "@(#)sbpf.c 1.2 12/3/95 (C)1995 Darren Reed";
44 (001) jeq #0x800 jt 2 jf 5
46 (003) jeq #0x6 jt 4 jf 5
50 struct bpf_insn filter[] = {
51 /* 0. */ { BPF_LD|BPF_H|BPF_ABS, 0, 0, 12 },
52 /* 1. */ { BPF_JMP|BPF_JEQ, 0, 3, 0x0800 },
53 /* 2. */ { BPF_LD|BPF_B|BPF_ABS, 0, 0, 23 },
54 /* 3. */ { BPF_JMP|BPF_JEQ, 0, 1, 0x06 },
55 /* 4. */ { BPF_RET, 0, 0, 68 },
56 /* 5. */ { BPF_RET, 0, 0, 0 }
59 * the code herein is dervied from libpcap.
61 static u_char *buf = NULL;
62 static u_int bufsize = 32768, timeout = 1;
73 tcp = (tcphdr_t *)(ip + 1);
74 bcopy(ep + 14, (char *)ip, sizeof(*ip));
75 bcopy(ep + 14 + (ip->ip_hl << 2), (char *)tcp, sizeof(*tcp));
76 if (ip->ip_p != IPPROTO_TCP && ip->ip_p != IPPROTO_UDP)
78 if (ip->ip_p & 0x1fff != 0)
80 if (0 == detect(ip, tcp))
86 int readloop(fd, port, dst)
90 register u_char *bp, *cp, *bufend;
91 register struct bpf_hdr *bh;
93 time_t in = time(NULL);
96 while ((cc = read(fd, buf, bufsize)) >= 0) {
97 if (!cc && (time(NULL) - in) > timeout)
102 * loop through each snapshot in the chunk
104 while (bp < bufend) {
105 bh = (struct bpf_hdr *)bp;
106 cp = bp + bh->bh_hdrlen;
107 done += ack_recv(cp);
108 bp += BPF_WORDALIGN(bh->bh_caplen + bh->bh_hdrlen);
116 int initdevice(device, tout)
120 struct bpf_program prog;
121 struct bpf_version bv;
127 for (i = 0; i < 16; i++)
129 (void) sprintf(bpfname, "/dev/bpf%d", i);
130 if ((fd = open(bpfname, O_RDWR)) >= 0)
135 fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
139 if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
141 perror("BIOCVERSION");
144 if (bv.bv_major != BPF_MAJOR_VERSION ||
145 bv.bv_minor < BPF_MINOR_VERSION)
147 fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
148 bv.bv_major, bv.bv_minor);
149 fprintf(stderr, "current version: %d.%d\n",
150 BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
154 (void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
155 if (ioctl(fd, BIOCSETIF, &ifr) == -1)
157 fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
167 if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
169 perror("BIOCSRTIMEOUT");
173 * get kernel buffer size
175 if (ioctl(fd, BIOCSBLEN, &bufsize) == -1)
177 if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
182 printf("BPF buffer size: %d\n", bufsize);
183 buf = (u_char*)malloc(bufsize);
185 prog.bf_len = sizeof(filter) / sizeof(struct bpf_insn);
186 prog.bf_insns = filter;
187 if (ioctl(fd, BIOCSETF, (caddr_t)&prog) == -1)
192 (void) ioctl(fd, BIOCFLUSH, 0);