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Annotation of src/lib/libc/net/linkaddr.c, Revision 1.16

1.16    ! matt        1: /*     $NetBSD: linkaddr.c,v 1.15 2012/03/13 21:13:41 christos Exp $   */
1.5       cgd         2:
1.1       cgd         3: /*-
1.5       cgd         4:  * Copyright (c) 1990, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
1.13      agc        15:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
1.6       christos   32: #include <sys/cdefs.h>
1.1       cgd        33: #if defined(LIBC_SCCS) && !defined(lint)
1.5       cgd        34: #if 0
                     35: static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93";
                     36: #else
1.16    ! matt       37: __RCSID("$NetBSD: linkaddr.c,v 1.15 2012/03/13 21:13:41 christos Exp $");
1.5       cgd        38: #endif
1.1       cgd        39: #endif /* LIBC_SCCS and not lint */
                     40:
                     41: #include <sys/types.h>
                     42: #include <sys/socket.h>
                     43: #include <net/if_dl.h>
1.10      lukem      44:
                     45: #include <assert.h>
1.1       cgd        46: #include <string.h>
                     47:
                     48: /* States*/
                     49: #define NAMING 0
                     50: #define GOTONE 1
                     51: #define GOTTWO 2
                     52: #define RESET  3
                     53: /* Inputs */
                     54: #define        DIGIT   (4*0)
                     55: #define        END     (4*1)
                     56: #define DELIM  (4*2)
                     57: #define LETTER (4*3)
                     58:
                     59: void
1.15      christos   60: link_addr(const char *addr, struct sockaddr_dl *sdl)
1.1       cgd        61: {
                     62:        register char *cp = sdl->sdl_data;
1.9       christos   63:        char *cplim = sdl->sdl_len + (char *)(void *)sdl;
1.15      christos   64:        int byte = 0, state = NAMING;
                     65:        size_t newaddr = 0;     /* pacify gcc */
1.1       cgd        66:
1.10      lukem      67:        _DIAGASSERT(addr != NULL);
                     68:        _DIAGASSERT(sdl != NULL);
                     69:
1.8       kleink     70:        (void)memset(&sdl->sdl_family, 0, (size_t)sdl->sdl_len - 1);
1.1       cgd        71:        sdl->sdl_family = AF_LINK;
                     72:        do {
                     73:                state &= ~LETTER;
                     74:                if ((*addr >= '0') && (*addr <= '9')) {
1.6       christos   75:                        newaddr = *addr - '0';
1.1       cgd        76:                } else if ((*addr >= 'a') && (*addr <= 'f')) {
1.6       christos   77:                        newaddr = *addr - 'a' + 10;
1.1       cgd        78:                } else if ((*addr >= 'A') && (*addr <= 'F')) {
1.6       christos   79:                        newaddr = *addr - 'A' + 10;
1.1       cgd        80:                } else if (*addr == 0) {
                     81:                        state |= END;
                     82:                } else if (state == NAMING &&
                     83:                           (((*addr >= 'A') && (*addr <= 'Z')) ||
                     84:                           ((*addr >= 'a') && (*addr <= 'z'))))
                     85:                        state |= LETTER;
                     86:                else
                     87:                        state |= DELIM;
                     88:                addr++;
                     89:                switch (state /* | INPUT */) {
                     90:                case NAMING | DIGIT:
                     91:                case NAMING | LETTER:
1.5       cgd        92:                        *cp++ = addr[-1];
                     93:                        continue;
1.1       cgd        94:                case NAMING | DELIM:
1.5       cgd        95:                        state = RESET;
1.15      christos   96:                        _DIAGASSERT(__type_fit(uint8_t, cp - sdl->sdl_data));
                     97:                        sdl->sdl_nlen = (uint8_t)(cp - sdl->sdl_data);
1.5       cgd        98:                        continue;
1.1       cgd        99:                case GOTTWO | DIGIT:
1.5       cgd       100:                        *cp++ = byte;
                    101:                        /* FALLTHROUGH */
1.1       cgd       102:                case RESET | DIGIT:
1.5       cgd       103:                        state = GOTONE;
1.15      christos  104:                        byte = (int)newaddr;
1.5       cgd       105:                        continue;
1.1       cgd       106:                case GOTONE | DIGIT:
1.5       cgd       107:                        state = GOTTWO;
1.15      christos  108:                        byte = (int)newaddr + (byte << 4);
1.5       cgd       109:                        continue;
1.1       cgd       110:                default: /* | DELIM */
1.5       cgd       111:                        state = RESET;
                    112:                        *cp++ = byte;
                    113:                        byte = 0;
                    114:                        continue;
1.1       cgd       115:                case GOTONE | END:
                    116:                case GOTTWO | END:
1.5       cgd       117:                        *cp++ = byte;
                    118:                        /* FALLTHROUGH */
1.1       cgd       119:                case RESET | END:
                    120:                        break;
                    121:                }
                    122:                break;
                    123:        } while (cp < cplim);
1.15      christos  124:
                    125:        _DIAGASSERT(__type_fit(uint8_t, cp - LLADDR(sdl)));
                    126:        sdl->sdl_alen = (uint8_t)(cp - LLADDR(sdl));
1.9       christos  127:        newaddr = cp - (char *)(void *)sdl;
1.15      christos  128:        if (newaddr > sizeof(*sdl)) {
                    129:                _DIAGASSERT(__type_fit(uint8_t, newaddr));
                    130:                sdl->sdl_len = (uint8_t)newaddr;
                    131:        }
1.1       cgd       132:        return;
                    133: }
                    134:
1.7       mycroft   135: static const char hexlist[16] = "0123456789abcdef";
1.1       cgd       136:
                    137: char *
1.16    ! matt      138: link_ntoa(const struct sockaddr_dl *sdl)
1.1       cgd       139: {
                    140:        static char obuf[64];
                    141:        register char *out = obuf;
1.9       christos  142:        register size_t i;
1.14      christos  143:        const u_char *in = (const u_char *)CLLADDR(sdl);
                    144:        const u_char *inlim = in + sdl->sdl_alen;
1.1       cgd       145:        int firsttime = 1;
1.10      lukem     146:
                    147:        _DIAGASSERT(sdl != NULL);
1.1       cgd       148:
                    149:        if (sdl->sdl_nlen) {
1.8       kleink    150:                (void)memcpy(obuf, sdl->sdl_data, (size_t)sdl->sdl_nlen);
1.1       cgd       151:                out += sdl->sdl_nlen;
1.5       cgd       152:                if (sdl->sdl_alen)
                    153:                        *out++ = ':';
1.1       cgd       154:        }
                    155:        while (in < inlim) {
1.5       cgd       156:                if (firsttime)
                    157:                        firsttime = 0;
                    158:                else
                    159:                        *out++ = '.';
1.1       cgd       160:                i = *in++;
                    161:                if (i > 0xf) {
                    162:                        out[1] = hexlist[i & 0xf];
                    163:                        i >>= 4;
                    164:                        out[0] = hexlist[i];
                    165:                        out += 2;
                    166:                } else
                    167:                        *out++ = hexlist[i];
                    168:        }
                    169:        *out = 0;
1.5       cgd       170:        return (obuf);
1.1       cgd       171: }

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