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 42 #define CHUNKSIZE 8192 43 #define BUFSPACE (4*CHUNKSIZE) 44 45 /* 46 * Be careful to only include those defined in the flags option for the 47 * interface are included in the header size. 48 */ 49 #define BUFHDR_SIZE (sizeof(struct nit_bufhdr)) 50 #define NIT_HDRSIZE (BUFHDR_SIZE) 51 52 static int timeout; 53 54 55 int 56 initdevice(char *device, int tout) 57 { 58 struct strioctl si; 59 struct timeval to; 60 struct ifreq ifr; 61 int fd; 62 63 if ((fd = open("/dev/nit", O_RDWR)) < 0) 64 { 65 perror("/dev/nit"); 66 exit(-1); 67 } 68 69 /* 70 * arrange to get messages from the NIT STREAM and use NIT_BUF option 71 */ 72 ioctl(fd, I_SRDOPT, (char*)RMSGD); 73 ioctl(fd, I_PUSH, "nbuf"); 74 75 /* 76 * set the timeout 77 */ 78 timeout = tout; 79 si.ic_timout = 1; 80 to.tv_sec = 1; 81 to.tv_usec = 0; 82 si.ic_cmd = NIOCSTIME; 83 si.ic_len = sizeof(to); 84 si.ic_dp = (char*)&to; 85 if (ioctl(fd, I_STR, (char*)&si) == -1) 86 { 87 perror("ioctl: NIT timeout"); 88 exit(-1); 89 } 90 91 /* 92 * request the interface 93 */ 94 strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 95 ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' '; 96 si.ic_cmd = NIOCBIND; 97 si.ic_len = sizeof(ifr); 98 si.ic_dp = (char*)𝔦 99 if (ioctl(fd, I_STR, (char*)&si) == -1) 100 { 101 perror(ifr.ifr_name); 102 exit(1); 103 } 104 return (fd); 105 } 106 107 108 /* 109 * output an IP packet onto a fd opened for /dev/nit 110 */ 111 int 112 sendip(int fd, char *pkt, int len) 113 int fd, len; 114 char *pkt; 115 { 116 struct sockaddr sk, *sa = &sk; 117 struct strbuf cbuf, *cp = &cbuf, dbuf, *dp = &dbuf; 118 119 /* 120 * For ethernet, need at least 802.3 header and IP header. 121 */ 122 if (len < (sizeof(sa->sa_data) + sizeof(struct ip))) 123 return (-1); 124 /* 125 * to avoid any output processing for IP, say we're not. 126 */ 127 sa->sa_family = AF_UNSPEC; 128 bcopy(pkt, sa->sa_data, sizeof(sa->sa_data)); 129 pkt += sizeof(sa->sa_data); 130 len -= sizeof(sa->sa_data); 131 132 /* 133 * construct NIT STREAMS messages, first control then data. 134 */ 135 cp->len = sizeof(*sa); 136 cp->maxlen = sizeof(*sa); 137 cp->buf = (char *)sa; 138 139 dp->buf = pkt; 140 dp->len = len; 141 dp->maxlen = dp->len; 142 143 if (putmsg(fd, cp, dp, 0) == -1) 144 { 145 perror("putmsg"); 146 return (-1); 147 } 148 149 if (ioctl(fd, I_FLUSH, FLUSHW) == -1) 150 { 151 perror("I_FLUSH"); 152 return (-1); 153 } 154 return (len); 155 } 156