1 | /* |
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2 | * Copyright 1996 Massachusetts Institute of Technology |
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3 | * |
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4 | * Permission to use, copy, modify, and distribute this software and |
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5 | * its documentation for any purpose and without fee is hereby |
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6 | * granted, provided that both the above copyright notice and this |
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7 | * permission notice appear in all copies, that both the above |
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8 | * copyright notice and this permission notice appear in all |
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9 | * supporting documentation, and that the name of M.I.T. not be used |
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10 | * in advertising or publicity pertaining to distribution of the |
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11 | * software without specific, written prior permission. M.I.T. makes |
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12 | * no representations about the suitability of this software for any |
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13 | * purpose. It is provided "as is" without express or implied |
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14 | * warranty. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS |
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17 | * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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18 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT |
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20 | * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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21 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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22 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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23 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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26 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | * $ANA: addr2ascii.c,v 1.1 1996/06/13 18:41:46 wollman Exp $ |
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30 | */ |
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31 | |
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32 | #include <sys/types.h> |
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33 | #include <sys/socket.h> |
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34 | |
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35 | #include <errno.h> |
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36 | #include <string.h> |
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37 | |
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38 | #include <net/if_dl.h> |
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39 | #include <netinet/in.h> |
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40 | #include <arpa/inet.h> |
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41 | |
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42 | /*- |
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43 | * Convert a network address from binary to printable numeric format. |
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44 | * This API is copied from INRIA's IPv6 implementation, but it is a |
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45 | * bit bogus in two ways: |
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46 | * |
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47 | * 1) There is no value in passing both an address family and |
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48 | * an address length; either one should imply the other, |
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49 | * or we should be passing sockaddrs instead. |
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50 | * 2) There should by contrast be /added/ a length for the buffer |
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51 | * that we pass in, so that programmers are spared the need to |
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52 | * manually calculate (read: ``guess'') the maximum length. |
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53 | * |
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54 | * Flash: the API is also the same in the NRL implementation, and seems to |
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55 | * be some sort of standard, so we appear to be stuck with both the bad |
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56 | * naming and the poor choice of arguments. |
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57 | */ |
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58 | char * |
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59 | addr2ascii(af, addrp, len, buf) |
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60 | int af; |
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61 | const void *addrp; |
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62 | int len; /* should be size_t XXX */ |
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63 | char *buf; /* XXX should pass length of buffer */ |
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64 | { |
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65 | static char staticbuf[64]; /* 64 for AF_LINK > 16 for AF_INET */ |
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66 | |
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67 | if (!buf) |
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68 | buf = staticbuf; |
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69 | |
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70 | switch(af) { |
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71 | case AF_INET: |
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72 | if (len != sizeof(struct in_addr)) { |
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73 | errno = ENAMETOOLONG; |
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74 | return 0; |
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75 | } |
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76 | strcpy(buf, inet_ntoa(*(const struct in_addr *)addrp)); |
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77 | break; |
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78 | |
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79 | case AF_LINK: |
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80 | if (len != sizeof(struct sockaddr_dl)) { |
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81 | errno = ENAMETOOLONG; |
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82 | return 0; |
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83 | } |
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84 | strcpy(buf, link_ntoa((const struct sockaddr_dl *)addrp)); |
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85 | break; |
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86 | |
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87 | default: |
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88 | errno = EPROTONOSUPPORT; |
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89 | return 0; |
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90 | } |
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91 | return buf; |
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92 | } |
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