/* * hwaddr.c - routines that deal with hardware addresses. * (i.e. Ethernet) * * $FreeBSD: src/libexec/bootpd/hwaddr.c,v 1.7.2.1 2003/02/15 05:36:01 kris Exp $ */ #include #include #include #include #if defined(SUNOS) || defined(SVR4) #include #endif #ifdef SVR4 #include #include #include #endif #ifdef _AIX32 #include /* for struct timeval in net/if.h */ #include /* for struct ifnet in net/if_arp.h */ #endif #include #include #ifdef WIN_TCP #include #include #endif #include #ifndef NO_UNISTD #include #endif #include #ifndef USE_BFUNCS /* Yes, memcpy is OK here (no overlapped copies). */ #include #define bcopy(a,b,c) memcpy(b,a,c) #define bzero(p,l) memset(p,0,l) #define bcmp(a,b,c) memcmp(a,b,c) #endif #ifndef ATF_INUSE /* Not defined on some systems (i.e. Linux) */ #define ATF_INUSE 0 #endif /* For BSD 4.4, set arp entry by writing to routing socket */ #if defined(BSD) #if BSD >= 199306 extern int bsd_arp_set (struct in_addr *, char *, int); #endif #endif #include "bptypes.h" #include "hwaddr.h" #include "report.h" extern int debug; /* * Hardware address lengths (in bytes) and network name based on hardware * type code. List in order specified by Assigned Numbers RFC; Array index * is hardware type code. Entries marked as zero are unknown to the author * at this time. . . . */ struct hwinfo hwinfolist[] = { {0, "Reserved"}, /* Type 0: Reserved (don't use this) */ {6, "Ethernet"}, /* Type 1: 10Mb Ethernet (48 bits) */ {1, "3Mb Ethernet"}, /* Type 2: 3Mb Ethernet (8 bits) */ {0, "AX.25"}, /* Type 3: Amateur Radio AX.25 */ {1, "ProNET"}, /* Type 4: Proteon ProNET Token Ring */ {0, "Chaos"}, /* Type 5: Chaos */ {6, "IEEE 802"}, /* Type 6: IEEE 802 Networks */ {0, "ARCNET"} /* Type 7: ARCNET */ }; int hwinfocnt = NELEM(hwinfolist); /* * Setup the arp cache so that IP address 'ia' will be temporarily * bound to hardware address 'ha' of length 'len'. * * s socket fd * ia protocol address * hafamily HW address family * halen HW address data */ void setarp(int s, struct in_addr *ia, int hafamily, u_char *haddr, int halen) { #ifdef SIOCSARP #ifdef WIN_TCP /* This is an SVR4 with different networking code from * Wollongong WIN-TCP. Not quite like the Lachman code. * Code from: drew@drewsun.FEITH.COM (Andrew B. Sudell) */ #undef SIOCSARP #define SIOCSARP ARP_ADD struct arptab arpreq; /* Arp table entry */ bzero((caddr_t) &arpreq, sizeof(arpreq)); arpreq.at_flags = ATF_COM; /* Set up IP address */ arpreq.at_in = ia->s_addr; /* Set up Hardware Address */ bcopy(haddr, arpreq.at_enaddr, halen); /* Set the Date Link type. */ /* XXX - Translate (hafamily) to dltype somehow? */ arpreq.at_dltype = DL_ETHER; #else /* WIN_TCP */ /* Good old Berkeley way. */ struct arpreq arpreq; /* Arp request ioctl block */ struct sockaddr_in *si; char *p; bzero((caddr_t) &arpreq, sizeof(arpreq)); arpreq.arp_flags = ATF_INUSE | ATF_COM; /* Set up the protocol address. */ arpreq.arp_pa.sa_family = AF_INET; si = (struct sockaddr_in *) &arpreq.arp_pa; si->sin_addr = *ia; /* Set up the hardware address. */ #ifdef __linux__ /* XXX - Do others need this? -gwr */ /* * Linux requires the sa_family field set. * longyear@netcom.com (Al Longyear) */ arpreq.arp_ha.sa_family = hafamily; #endif /* linux */ /* This variable is just to help catch type mismatches. */ p = arpreq.arp_ha.sa_data; bcopy(haddr, p, halen); #endif /* WIN_TCP */ #ifdef SVR4 /* * And now the stuff for System V Rel 4.x which does not * appear to allow SIOCxxx ioctls on a socket descriptor. * Thanks to several people: (all sent the same fix) * Barney Wolff , * bear@upsys.se (Bj|rn Sj|holm), * Michael Kuschke , */ { int fd; struct strioctl iocb; if ((fd=open("/dev/arp", O_RDWR)) < 0) { report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg()); } iocb.ic_cmd = SIOCSARP; iocb.ic_timout = 0; iocb.ic_dp = (char *)&arpreq; iocb.ic_len = sizeof(arpreq); if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) { report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg()); } close (fd); } #else /* SVR4 */ /* * On SunOS, the ioctl sometimes returns ENXIO, and it * appears to happen when the ARP cache entry you tried * to add is already in the cache. (Sigh...) * XXX - Should this error simply be ignored? -gwr */ if (ioctl(s, SIOCSARP, (caddr_t) &arpreq) < 0) { report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg()); } #endif /* SVR4 */ #else /* SIOCSARP */ #if defined(BSD) && (BSD >= 199306) bsd_arp_set(ia, haddr, halen); #else /* * Oh well, SIOCSARP is not defined. Just run arp(8). * Need to delete partial entry first on some systems. * XXX - Gag! */ int status; char buf[256]; char *a; extern char *inet_ntoa(); a = inet_ntoa(*ia); snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp", a, a, haddrtoa(haddr, halen)); if (debug > 2) report(LOG_INFO, "%s", buf); status = system(buf); if (status) report(LOG_ERR, "arp failed, exit code=0x%x", status); return; #endif /* ! 4.4 BSD */ #endif /* SIOCSARP */ } /* * Convert a hardware address to an ASCII string. */ char * haddrtoa(u_char *haddr, int hlen) { static char haddrbuf[3 * MAXHADDRLEN + 1]; char *bufptr; if (hlen > MAXHADDRLEN) hlen = MAXHADDRLEN; bufptr = haddrbuf; while (hlen > 0) { sprintf(bufptr, "%02X:", (unsigned) (*haddr++ & 0xFF)); bufptr += 3; hlen--; } bufptr[-1] = 0; return (haddrbuf); } /* * haddr_conv802() * -------------- * * Converts a backwards address to a canonical address and a canonical address * to a backwards address. * * INPUTS: * adr_in - pointer to six byte string to convert (unsigned char *) * addr_len - how many bytes to convert * * OUTPUTS: * addr_out - The string is updated to contain the converted address. * * CALLER: * many * * DATA: * Uses conv802table to bit-reverse the address bytes. */ static u_char conv802table[256] = { /* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, /* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, /* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, /* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, /* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, /* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, /* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, /* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, /* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, /* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, /* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, /* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, /* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, /* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, /* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, /* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, /* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, /* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, /* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, /* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, /* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, /* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, /* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, /* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, /* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, /* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, /* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, /* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, /* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, /* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, /* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, /* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF, }; void haddr_conv802(u_char *addr_in, u_char *addr_out, int len) { u_char *lim; lim = addr_out + len; while (addr_out < lim) *addr_out++ = conv802table[*addr_in++]; } #if 0 /* * For the record, here is a program to generate the * bit-reverse table above. */ static int bitrev(int n) { int i, r; r = 0; for (i = 0; i < 8; i++) { r <<= 1; r |= (n & 1); n >>= 1; } return r; } int main(void) { int i; for (i = 0; i <= 0xFF; i++) { if ((i & 7) == 0) printf("/* 0x%02X */", i); printf(" 0x%02X,", bitrev(i)); if ((i & 7) == 7) printf("\n"); } return 0; } #endif