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 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