1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * PPPoE common utilities and data. 24*0Sstevel@tonic-gate * 25*0Sstevel@tonic-gate * Copyright 2000-2002 Sun Microsystems, Inc. All rights reserved. 26*0Sstevel@tonic-gate * Use is subject to license terms. 27*0Sstevel@tonic-gate */ 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate #include <stdio.h> 32*0Sstevel@tonic-gate #include <unistd.h> 33*0Sstevel@tonic-gate #include <string.h> 34*0Sstevel@tonic-gate #include <errno.h> 35*0Sstevel@tonic-gate #include <netdb.h> 36*0Sstevel@tonic-gate #include <assert.h> 37*0Sstevel@tonic-gate #include <stropts.h> 38*0Sstevel@tonic-gate #include <sys/types.h> 39*0Sstevel@tonic-gate #include <inet/common.h> 40*0Sstevel@tonic-gate #include <netinet/in.h> 41*0Sstevel@tonic-gate #include <net/sppptun.h> 42*0Sstevel@tonic-gate #include <net/pppoe.h> 43*0Sstevel@tonic-gate #include <arpa/inet.h> 44*0Sstevel@tonic-gate 45*0Sstevel@tonic-gate #include "common.h" 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate /* Not all functions are used by all applications. Let lint know this. */ 48*0Sstevel@tonic-gate /*LINTLIBRARY*/ 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate /* Common I/O buffers */ 51*0Sstevel@tonic-gate uint32_t pkt_input[PKT_INPUT_LEN / sizeof (uint32_t)]; 52*0Sstevel@tonic-gate uint32_t pkt_octl[PKT_OCTL_LEN / sizeof (uint32_t)]; 53*0Sstevel@tonic-gate uint32_t pkt_output[PKT_OUTPUT_LEN / sizeof (uint32_t)]; 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate const char tunnam[] = "/dev/" PPP_TUN_NAME; 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate const ether_addr_t ether_bcast = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate /* 60*0Sstevel@tonic-gate * Wrapper for standard strerror() function -- the standard allows 61*0Sstevel@tonic-gate * that routine to return NULL, and that's inconvenient to handle. 62*0Sstevel@tonic-gate * This function never returns NULL. 63*0Sstevel@tonic-gate */ 64*0Sstevel@tonic-gate const char * 65*0Sstevel@tonic-gate mystrerror(int err) 66*0Sstevel@tonic-gate { 67*0Sstevel@tonic-gate const char *estr; 68*0Sstevel@tonic-gate static char ebuf[64]; 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate if ((estr = strerror(err)) != NULL) 71*0Sstevel@tonic-gate return (estr); 72*0Sstevel@tonic-gate (void) snprintf(ebuf, sizeof (ebuf), "Error:%d", err); 73*0Sstevel@tonic-gate return (ebuf); 74*0Sstevel@tonic-gate } 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate /* 77*0Sstevel@tonic-gate * Wrapper for standard perror() function -- the standard definition 78*0Sstevel@tonic-gate * of perror doesn't include the program name in the output and is 79*0Sstevel@tonic-gate * thus inconvenient to use. 80*0Sstevel@tonic-gate */ 81*0Sstevel@tonic-gate void 82*0Sstevel@tonic-gate myperror(const char *emsg) 83*0Sstevel@tonic-gate { 84*0Sstevel@tonic-gate (void) fprintf(stderr, "%s: %s: %s\n", myname, emsg, 85*0Sstevel@tonic-gate mystrerror(errno)); 86*0Sstevel@tonic-gate } 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate /* 89*0Sstevel@tonic-gate * Wrapper for standard getmsg() function. Completely discards any 90*0Sstevel@tonic-gate * fragmented messages because we don't expect ever to see these from 91*0Sstevel@tonic-gate * a properly functioning tunnel driver. Returns flags 92*0Sstevel@tonic-gate * (MORECTL|MOREDATA) as seen by interface. 93*0Sstevel@tonic-gate */ 94*0Sstevel@tonic-gate int 95*0Sstevel@tonic-gate mygetmsg(int fd, struct strbuf *ctrl, struct strbuf *data, int *flags) 96*0Sstevel@tonic-gate { 97*0Sstevel@tonic-gate int retv; 98*0Sstevel@tonic-gate int hadflags; 99*0Sstevel@tonic-gate 100*0Sstevel@tonic-gate hadflags = getmsg(fd, ctrl, data, flags); 101*0Sstevel@tonic-gate if (hadflags <= 0 || !(hadflags & (MORECTL | MOREDATA))) 102*0Sstevel@tonic-gate return (hadflags); 103*0Sstevel@tonic-gate 104*0Sstevel@tonic-gate do { 105*0Sstevel@tonic-gate if (flags != NULL) 106*0Sstevel@tonic-gate *flags = 0; 107*0Sstevel@tonic-gate retv = getmsg(fd, ctrl, data, flags); 108*0Sstevel@tonic-gate } while (retv > 0 || (retv < 0 && errno == EINTR)); 109*0Sstevel@tonic-gate 110*0Sstevel@tonic-gate /* 111*0Sstevel@tonic-gate * What remains at this point is the tail end of the 112*0Sstevel@tonic-gate * truncated message. Toss it. 113*0Sstevel@tonic-gate */ 114*0Sstevel@tonic-gate 115*0Sstevel@tonic-gate return (retv < 0 ? retv : hadflags); 116*0Sstevel@tonic-gate } 117*0Sstevel@tonic-gate 118*0Sstevel@tonic-gate /* 119*0Sstevel@tonic-gate * Common wrapper function for STREAMS I_STR ioctl. Returns -1 on 120*0Sstevel@tonic-gate * failure, 0 for success. 121*0Sstevel@tonic-gate */ 122*0Sstevel@tonic-gate int 123*0Sstevel@tonic-gate strioctl(int fd, int cmd, void *ptr, int ilen, int olen) 124*0Sstevel@tonic-gate { 125*0Sstevel@tonic-gate struct strioctl str; 126*0Sstevel@tonic-gate 127*0Sstevel@tonic-gate str.ic_cmd = cmd; 128*0Sstevel@tonic-gate str.ic_timout = 0; /* Default timeout; 15 seconds */ 129*0Sstevel@tonic-gate str.ic_len = ilen; 130*0Sstevel@tonic-gate str.ic_dp = ptr; 131*0Sstevel@tonic-gate 132*0Sstevel@tonic-gate if (ioctl(fd, I_STR, &str) == -1) { 133*0Sstevel@tonic-gate return (-1); 134*0Sstevel@tonic-gate } 135*0Sstevel@tonic-gate if (str.ic_len != olen) { 136*0Sstevel@tonic-gate errno = EINVAL; 137*0Sstevel@tonic-gate return (-1); 138*0Sstevel@tonic-gate } 139*0Sstevel@tonic-gate return (0); 140*0Sstevel@tonic-gate } 141*0Sstevel@tonic-gate 142*0Sstevel@tonic-gate /* 143*0Sstevel@tonic-gate * Format a PPPoE header in the user's buffer. The returned pointer 144*0Sstevel@tonic-gate * is either identical to the first argument, or is NULL if it's not 145*0Sstevel@tonic-gate * usable. On entry, dptr should point to the first byte after the 146*0Sstevel@tonic-gate * Ethertype field, codeval should be one of the POECODE_* values, and 147*0Sstevel@tonic-gate * sessionid should be the assigned session ID number or one of the 148*0Sstevel@tonic-gate * special POESESS_* values. 149*0Sstevel@tonic-gate */ 150*0Sstevel@tonic-gate poep_t * 151*0Sstevel@tonic-gate poe_mkheader(void *dptr, uint8_t codeval, int sessionid) 152*0Sstevel@tonic-gate { 153*0Sstevel@tonic-gate poep_t *poep; 154*0Sstevel@tonic-gate 155*0Sstevel@tonic-gate /* Discard obvious junk. */ 156*0Sstevel@tonic-gate assert(dptr != NULL && IS_P2ALIGNED(dptr, sizeof (poep_t *))); 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate /* Initialize the header */ 159*0Sstevel@tonic-gate poep = (poep_t *)dptr; 160*0Sstevel@tonic-gate poep->poep_version_type = POE_VERSION; 161*0Sstevel@tonic-gate poep->poep_code = codeval; 162*0Sstevel@tonic-gate poep->poep_session_id = htons(sessionid); 163*0Sstevel@tonic-gate poep->poep_length = htons(0); 164*0Sstevel@tonic-gate return (poep); 165*0Sstevel@tonic-gate } 166*0Sstevel@tonic-gate 167*0Sstevel@tonic-gate /* 168*0Sstevel@tonic-gate * Validate that a given tag is intact. This is intended to be used 169*0Sstevel@tonic-gate * in tag-parsing loops before attempting to access the tag data. 170*0Sstevel@tonic-gate */ 171*0Sstevel@tonic-gate boolean_t 172*0Sstevel@tonic-gate poe_tagcheck(const poep_t *poep, int length, const uint8_t *tptr) 173*0Sstevel@tonic-gate { 174*0Sstevel@tonic-gate int plen; 175*0Sstevel@tonic-gate const uint8_t *tstart, *tend; 176*0Sstevel@tonic-gate 177*0Sstevel@tonic-gate if (poep == NULL || !IS_P2ALIGNED(poep, sizeof (uint16_t)) || 178*0Sstevel@tonic-gate tptr == NULL || length < sizeof (*poep)) 179*0Sstevel@tonic-gate return (B_FALSE); 180*0Sstevel@tonic-gate 181*0Sstevel@tonic-gate plen = poe_length(poep); 182*0Sstevel@tonic-gate if (plen + sizeof (*poep) > length) 183*0Sstevel@tonic-gate return (B_FALSE); 184*0Sstevel@tonic-gate 185*0Sstevel@tonic-gate tstart = (const uint8_t *)(poep+1); 186*0Sstevel@tonic-gate tend = tstart + plen; 187*0Sstevel@tonic-gate 188*0Sstevel@tonic-gate /* 189*0Sstevel@tonic-gate * Note careful dereference of tptr; it might be near the end 190*0Sstevel@tonic-gate * already, so we have to range check it before dereferencing 191*0Sstevel@tonic-gate * to get the actual tag length. Yes, it looks like we have 192*0Sstevel@tonic-gate * duplicate array end checks. No, they're not duplicates. 193*0Sstevel@tonic-gate */ 194*0Sstevel@tonic-gate if (tptr < tstart || tptr+POET_HDRLEN > tend || 195*0Sstevel@tonic-gate tptr+POET_HDRLEN+POET_GET_LENG(tptr) > tend) 196*0Sstevel@tonic-gate return (B_FALSE); 197*0Sstevel@tonic-gate return (B_TRUE); 198*0Sstevel@tonic-gate } 199*0Sstevel@tonic-gate 200*0Sstevel@tonic-gate static int 201*0Sstevel@tonic-gate poe_tag_insert(poep_t *poep, uint16_t ttype, const void *data, size_t dlen) 202*0Sstevel@tonic-gate { 203*0Sstevel@tonic-gate int plen; 204*0Sstevel@tonic-gate uint8_t *dp; 205*0Sstevel@tonic-gate 206*0Sstevel@tonic-gate plen = poe_length(poep); 207*0Sstevel@tonic-gate if (data == NULL) 208*0Sstevel@tonic-gate dlen = 0; 209*0Sstevel@tonic-gate if (sizeof (*poep) + plen + POET_HDRLEN + dlen > PPPOE_MSGMAX) 210*0Sstevel@tonic-gate return (-1); 211*0Sstevel@tonic-gate dp = (uint8_t *)(poep + 1) + plen; 212*0Sstevel@tonic-gate POET_SET_TYPE(dp, ttype); 213*0Sstevel@tonic-gate POET_SET_LENG(dp, dlen); 214*0Sstevel@tonic-gate if (dlen > 0) 215*0Sstevel@tonic-gate (void) memcpy(POET_DATA(dp), data, dlen); 216*0Sstevel@tonic-gate poep->poep_length = htons(plen + POET_HDRLEN + dlen); 217*0Sstevel@tonic-gate return (0); 218*0Sstevel@tonic-gate } 219*0Sstevel@tonic-gate 220*0Sstevel@tonic-gate /* 221*0Sstevel@tonic-gate * Add a tag with text string data to a PPPoE packet being 222*0Sstevel@tonic-gate * constructed. Returns -1 if it doesn't fit, or 0 for success. 223*0Sstevel@tonic-gate */ 224*0Sstevel@tonic-gate int 225*0Sstevel@tonic-gate poe_add_str(poep_t *poep, uint16_t ttype, const char *str) 226*0Sstevel@tonic-gate { 227*0Sstevel@tonic-gate return (poe_tag_insert(poep, ttype, str, strlen(str))); 228*0Sstevel@tonic-gate } 229*0Sstevel@tonic-gate 230*0Sstevel@tonic-gate /* 231*0Sstevel@tonic-gate * Add a tag with 32-bit integer data to a PPPoE packet being 232*0Sstevel@tonic-gate * constructed. Returns -1 if it doesn't fit, or 0 for success. 233*0Sstevel@tonic-gate */ 234*0Sstevel@tonic-gate int 235*0Sstevel@tonic-gate poe_add_long(poep_t *poep, uint16_t ttype, uint32_t val) 236*0Sstevel@tonic-gate { 237*0Sstevel@tonic-gate val = htonl(val); 238*0Sstevel@tonic-gate return (poe_tag_insert(poep, ttype, &val, sizeof (val))); 239*0Sstevel@tonic-gate } 240*0Sstevel@tonic-gate 241*0Sstevel@tonic-gate /* 242*0Sstevel@tonic-gate * Add a tag with two 32-bit integers to a PPPoE packet being 243*0Sstevel@tonic-gate * constructed. Returns -1 if it doesn't fit, or 0 for success. 244*0Sstevel@tonic-gate */ 245*0Sstevel@tonic-gate int 246*0Sstevel@tonic-gate poe_two_longs(poep_t *poep, uint16_t ttype, uint32_t val1, uint32_t val2) 247*0Sstevel@tonic-gate { 248*0Sstevel@tonic-gate uint32_t vals[2]; 249*0Sstevel@tonic-gate 250*0Sstevel@tonic-gate vals[0] = htonl(val1); 251*0Sstevel@tonic-gate vals[1] = htonl(val2); 252*0Sstevel@tonic-gate return (poe_tag_insert(poep, ttype, vals, sizeof (vals))); 253*0Sstevel@tonic-gate } 254*0Sstevel@tonic-gate 255*0Sstevel@tonic-gate /* 256*0Sstevel@tonic-gate * Copy a single tag and its data from one PPPoE packet to a PPPoE 257*0Sstevel@tonic-gate * packet being constructed. Returns -1 if it doesn't fit, or 0 for 258*0Sstevel@tonic-gate * success. 259*0Sstevel@tonic-gate */ 260*0Sstevel@tonic-gate int 261*0Sstevel@tonic-gate poe_tag_copy(poep_t *poep, const uint8_t *tagp) 262*0Sstevel@tonic-gate { 263*0Sstevel@tonic-gate int tlen; 264*0Sstevel@tonic-gate int plen; 265*0Sstevel@tonic-gate 266*0Sstevel@tonic-gate tlen = POET_GET_LENG(tagp) + POET_HDRLEN; 267*0Sstevel@tonic-gate plen = poe_length(poep); 268*0Sstevel@tonic-gate if (sizeof (*poep) + plen + tlen > PPPOE_MSGMAX) 269*0Sstevel@tonic-gate return (-1); 270*0Sstevel@tonic-gate (void) memcpy((uint8_t *)(poep + 1) + plen, tagp, tlen); 271*0Sstevel@tonic-gate poep->poep_length = htons(tlen + plen); 272*0Sstevel@tonic-gate return (0); 273*0Sstevel@tonic-gate } 274*0Sstevel@tonic-gate 275*0Sstevel@tonic-gate struct tag_list { 276*0Sstevel@tonic-gate int tl_type; 277*0Sstevel@tonic-gate const char *tl_name; 278*0Sstevel@tonic-gate }; 279*0Sstevel@tonic-gate 280*0Sstevel@tonic-gate /* List of PPPoE data tag types. */ 281*0Sstevel@tonic-gate static const struct tag_list tag_list[] = { 282*0Sstevel@tonic-gate { POETT_END, "End-Of-List" }, 283*0Sstevel@tonic-gate { POETT_SERVICE, "Service-Name" }, 284*0Sstevel@tonic-gate { POETT_ACCESS, "AC-Name" }, 285*0Sstevel@tonic-gate { POETT_UNIQ, "Host-Uniq" }, 286*0Sstevel@tonic-gate { POETT_COOKIE, "AC-Cookie" }, 287*0Sstevel@tonic-gate { POETT_VENDOR, "Vendor-Specific" }, 288*0Sstevel@tonic-gate { POETT_RELAY, "Relay-Session-Id" }, 289*0Sstevel@tonic-gate { POETT_NAMERR, "Service-Name-Error" }, 290*0Sstevel@tonic-gate { POETT_SYSERR, "AC-System-Error" }, 291*0Sstevel@tonic-gate { POETT_GENERR, "Generic-Error" }, 292*0Sstevel@tonic-gate { POETT_MULTI, "Multicast-Capable" }, 293*0Sstevel@tonic-gate { POETT_HURL, "Host-URL" }, 294*0Sstevel@tonic-gate { POETT_MOTM, "Message-Of-The-Minute" }, 295*0Sstevel@tonic-gate { POETT_RTEADD, "IP-Route-Add" }, 296*0Sstevel@tonic-gate { 0, NULL } 297*0Sstevel@tonic-gate }; 298*0Sstevel@tonic-gate 299*0Sstevel@tonic-gate /* List of PPPoE message code numbers. */ 300*0Sstevel@tonic-gate static const struct tag_list code_list[] = { 301*0Sstevel@tonic-gate { POECODE_DATA, "Data" }, 302*0Sstevel@tonic-gate { POECODE_PADO, "Active Discovery Offer" }, 303*0Sstevel@tonic-gate { POECODE_PADI, "Active Discovery Initiation" }, 304*0Sstevel@tonic-gate { POECODE_PADR, "Active Discovery Request" }, 305*0Sstevel@tonic-gate { POECODE_PADS, "Active Discovery Session-confirmation" }, 306*0Sstevel@tonic-gate { POECODE_PADT, "Active Discovery Terminate" }, 307*0Sstevel@tonic-gate { POECODE_PADM, "Active Discovery Message" }, 308*0Sstevel@tonic-gate { POECODE_PADN, "Active Discovery Network" }, 309*0Sstevel@tonic-gate { 0, NULL } 310*0Sstevel@tonic-gate }; 311*0Sstevel@tonic-gate 312*0Sstevel@tonic-gate /* 313*0Sstevel@tonic-gate * Given a tag type number, return a pointer to a string describing 314*0Sstevel@tonic-gate * the tag. 315*0Sstevel@tonic-gate */ 316*0Sstevel@tonic-gate const char * 317*0Sstevel@tonic-gate poe_tagname(uint16_t tagtype) 318*0Sstevel@tonic-gate { 319*0Sstevel@tonic-gate const struct tag_list *tlp; 320*0Sstevel@tonic-gate static char tname[32]; 321*0Sstevel@tonic-gate 322*0Sstevel@tonic-gate for (tlp = tag_list; tlp->tl_name != NULL; tlp++) 323*0Sstevel@tonic-gate if (tagtype == tlp->tl_type) 324*0Sstevel@tonic-gate return (tlp->tl_name); 325*0Sstevel@tonic-gate (void) sprintf(tname, "Tag%d", tagtype); 326*0Sstevel@tonic-gate return (tname); 327*0Sstevel@tonic-gate } 328*0Sstevel@tonic-gate 329*0Sstevel@tonic-gate /* 330*0Sstevel@tonic-gate * Given a PPPoE message code number, return a pointer to a string 331*0Sstevel@tonic-gate * describing the message. 332*0Sstevel@tonic-gate */ 333*0Sstevel@tonic-gate const char * 334*0Sstevel@tonic-gate poe_codename(uint8_t codetype) 335*0Sstevel@tonic-gate { 336*0Sstevel@tonic-gate const struct tag_list *tlp; 337*0Sstevel@tonic-gate static char tname[32]; 338*0Sstevel@tonic-gate 339*0Sstevel@tonic-gate for (tlp = code_list; tlp->tl_name != NULL; tlp++) 340*0Sstevel@tonic-gate if (codetype == tlp->tl_type) 341*0Sstevel@tonic-gate return (tlp->tl_name); 342*0Sstevel@tonic-gate (void) sprintf(tname, "Code%d", codetype); 343*0Sstevel@tonic-gate return (tname); 344*0Sstevel@tonic-gate } 345*0Sstevel@tonic-gate 346*0Sstevel@tonic-gate /* 347*0Sstevel@tonic-gate * Given a tunnel driver address structure, return a pointer to a 348*0Sstevel@tonic-gate * string naming that Ethernet host. 349*0Sstevel@tonic-gate */ 350*0Sstevel@tonic-gate const char * 351*0Sstevel@tonic-gate ehost2(const struct ether_addr *ea) 352*0Sstevel@tonic-gate { 353*0Sstevel@tonic-gate static char hbuf[MAXHOSTNAMELEN+1]; 354*0Sstevel@tonic-gate 355*0Sstevel@tonic-gate if (ea == NULL) 356*0Sstevel@tonic-gate return ("NULL"); 357*0Sstevel@tonic-gate if (ether_ntohost(hbuf, ea) == 0) 358*0Sstevel@tonic-gate return (hbuf); 359*0Sstevel@tonic-gate return (ether_ntoa(ea)); 360*0Sstevel@tonic-gate } 361*0Sstevel@tonic-gate 362*0Sstevel@tonic-gate const char * 363*0Sstevel@tonic-gate ehost(const ppptun_atype *pap) 364*0Sstevel@tonic-gate { 365*0Sstevel@tonic-gate return (ehost2((const struct ether_addr *)pap)); 366*0Sstevel@tonic-gate } 367*0Sstevel@tonic-gate 368*0Sstevel@tonic-gate /* 369*0Sstevel@tonic-gate * Given an Internet address (in network byte order), return a pointer 370*0Sstevel@tonic-gate * to a string naming the host. 371*0Sstevel@tonic-gate */ 372*0Sstevel@tonic-gate const char * 373*0Sstevel@tonic-gate ihost(uint32_t haddr) 374*0Sstevel@tonic-gate { 375*0Sstevel@tonic-gate struct hostent *hp; 376*0Sstevel@tonic-gate struct sockaddr_in sin; 377*0Sstevel@tonic-gate 378*0Sstevel@tonic-gate (void) memset(&sin, '\0', sizeof (sin)); 379*0Sstevel@tonic-gate sin.sin_addr.s_addr = haddr; 380*0Sstevel@tonic-gate hp = gethostbyaddr((const char *)&sin, sizeof (sin), AF_INET); 381*0Sstevel@tonic-gate if (hp != NULL) 382*0Sstevel@tonic-gate return (hp->h_name); 383*0Sstevel@tonic-gate return (inet_ntoa(sin.sin_addr)); 384*0Sstevel@tonic-gate } 385*0Sstevel@tonic-gate 386*0Sstevel@tonic-gate int 387*0Sstevel@tonic-gate hexdecode(char chr) 388*0Sstevel@tonic-gate { 389*0Sstevel@tonic-gate if (chr >= '0' && chr <= '9') 390*0Sstevel@tonic-gate return ((int)(chr - '0')); 391*0Sstevel@tonic-gate if (chr >= 'a' && chr <= 'F') 392*0Sstevel@tonic-gate return ((int)(chr - 'a' + 10)); 393*0Sstevel@tonic-gate return ((int)(chr - 'A' + 10)); 394*0Sstevel@tonic-gate } 395