1
2 /*
3 * (C)opyright 1992-1998 Darren Reed. (from tcplog)
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 *
7 */
8
9 #include <stdio.h>
10 #include <netdb.h>
11 #include <ctype.h>
12 #include <signal.h>
13 #include <errno.h>
14 #include <sys/types.h>
15 #include <sys/time.h>
16 #include <sys/timeb.h>
17 #include <sys/socket.h>
18 #include <sys/file.h>
19 #include <sys/ioctl.h>
20 #include <net/nit.h>
21 #include <sys/fcntlcom.h>
22 #include <sys/dir.h>
23 #include <net/nit_if.h>
24 #include <net/nit_pf.h>
25 #include <net/nit_buf.h>
26 #include <net/packetfilt.h>
27 #include <sys/stropts.h>
28
29 #include <net/if.h>
30 #include <netinet/in.h>
31 #include <netinet/in_systm.h>
32 #include <netinet/ip.h>
33 #include <netinet/if_ether.h>
34 #include <netinet/ip_var.h>
35 #include <netinet/udp.h>
36 #include <netinet/udp_var.h>
37 #include <netinet/tcp.h>
38
39 #include "ipsend.h"
40
41 #if !defined(lint)
42 static const char sccsid[] = "@(#)snit.c 1.5 1/11/96 (C)1995 Darren Reed";
43 static const char rcsid[] = "@(#)$Id$";
44 #endif
45
46 #define CHUNKSIZE 8192
47 #define BUFSPACE (4*CHUNKSIZE)
48
49 /*
50 * Be careful to only include those defined in the flags option for the
51 * interface are included in the header size.
52 */
53 #define BUFHDR_SIZE (sizeof(struct nit_bufhdr))
54 #define NIT_HDRSIZE (BUFHDR_SIZE)
55
56 static int timeout;
57
58
59 int
initdevice(char * device,int tout)60 initdevice(char *device, int tout)
61 {
62 struct strioctl si;
63 struct timeval to;
64 struct ifreq ifr;
65 int fd;
66
67 if ((fd = open("/dev/nit", O_RDWR)) < 0)
68 {
69 perror("/dev/nit");
70 exit(-1);
71 }
72
73 /*
74 * arrange to get messages from the NIT STREAM and use NIT_BUF option
75 */
76 ioctl(fd, I_SRDOPT, (char*)RMSGD);
77 ioctl(fd, I_PUSH, "nbuf");
78
79 /*
80 * set the timeout
81 */
82 timeout = tout;
83 si.ic_timout = 1;
84 to.tv_sec = 1;
85 to.tv_usec = 0;
86 si.ic_cmd = NIOCSTIME;
87 si.ic_len = sizeof(to);
88 si.ic_dp = (char*)&to;
89 if (ioctl(fd, I_STR, (char*)&si) == -1)
90 {
91 perror("ioctl: NIT timeout");
92 exit(-1);
93 }
94
95 /*
96 * request the interface
97 */
98 strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
99 ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' ';
100 si.ic_cmd = NIOCBIND;
101 si.ic_len = sizeof(ifr);
102 si.ic_dp = (char*)𝔦
103 if (ioctl(fd, I_STR, (char*)&si) == -1)
104 {
105 perror(ifr.ifr_name);
106 exit(1);
107 }
108 return (fd);
109 }
110
111
112 /*
113 * output an IP packet onto a fd opened for /dev/nit
114 */
115 int
116 sendip(int fd, char *pkt, int len)
117 int fd, len;
118 char *pkt;
119 {
120 struct sockaddr sk, *sa = &sk;
121 struct strbuf cbuf, *cp = &cbuf, dbuf, *dp = &dbuf;
122
123 /*
124 * For ethernet, need at least 802.3 header and IP header.
125 */
126 if (len < (sizeof(sa->sa_data) + sizeof(struct ip)))
127 return (-1);
128 /*
129 * to avoid any output processing for IP, say we're not.
130 */
131 sa->sa_family = AF_UNSPEC;
132 bcopy(pkt, sa->sa_data, sizeof(sa->sa_data));
133 pkt += sizeof(sa->sa_data);
134 len -= sizeof(sa->sa_data);
135
136 /*
137 * construct NIT STREAMS messages, first control then data.
138 */
139 cp->len = sizeof(*sa);
140 cp->maxlen = sizeof(*sa);
141 cp->buf = (char *)sa;
142
143 dp->buf = pkt;
144 dp->len = len;
145 dp->maxlen = dp->len;
146
147 if (putmsg(fd, cp, dp, 0) == -1)
148 {
149 perror("putmsg");
150 return (-1);
151 }
152
153 if (ioctl(fd, I_FLUSH, FLUSHW) == -1)
154 {
155 perror("I_FLUSH");
156 return (-1);
157 }
158 return (len);
159 }
160