1 | /* |
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2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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3 | * unrestricted use provided that this legend is included on all tape |
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4 | * media and as a part of the software program in whole or part. Users |
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5 | * may copy or modify Sun RPC without charge, but are not authorized |
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6 | * to license or distribute it to anyone else except as part of a product or |
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7 | * program developed by the user. |
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8 | * |
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9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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12 | * |
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13 | * Sun RPC is provided with no support and without any obligation on the |
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14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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15 | * modification or enhancement. |
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16 | * |
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17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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19 | * OR ANY PART THEREOF. |
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20 | * |
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21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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22 | * or profits or other special, indirect and consequential damages, even if |
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23 | * Sun has been advised of the possibility of such damages. |
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24 | * |
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25 | * Sun Microsystems, Inc. |
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26 | * 2550 Garcia Avenue |
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27 | * Mountain View, California 94043 |
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28 | */ |
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29 | |
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30 | #if defined(LIBC_SCCS) && !defined(lint) |
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31 | /*static char *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/ |
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32 | /*static char *sccsid = "from: @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC";*/ |
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33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/get_myaddress.c,v 1.17 2000/01/27 23:06:37 jasone Exp $"; |
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34 | #endif |
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35 | |
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36 | /* |
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37 | * get_myaddress.c |
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38 | * |
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39 | * Get client's IP address via ioctl. This avoids using the yellowpages. |
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40 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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41 | */ |
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42 | |
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43 | #include <rpc/types.h> |
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44 | #include <rpc/xdr.h> |
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45 | #include <rpc/pmap_prot.h> |
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46 | #include <sys/socket.h> |
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47 | #include <stdio.h> |
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48 | #include <unistd.h> |
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49 | #include <net/if.h> |
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50 | #include <sys/ioctl.h> |
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51 | #include <netinet/in.h> |
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52 | #include <arpa/inet.h> |
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53 | |
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54 | /* |
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55 | * don't use gethostbyname, which would invoke yellow pages |
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56 | * |
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57 | * Avoid loopback interfaces. We return information from a loopback |
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58 | * interface only if there are no other possible interfaces. |
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59 | */ |
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60 | int |
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61 | get_myaddress(addr) |
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62 | struct sockaddr_in *addr; |
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63 | { |
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64 | int s; |
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65 | char buf[BUFSIZ]; |
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66 | struct ifconf ifc; |
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67 | struct ifreq ifreq, *ifr, *end; |
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68 | int loopback = 0, gotit = 0; |
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69 | |
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70 | if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
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71 | return(-1); |
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72 | } |
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73 | ifc.ifc_len = sizeof (buf); |
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74 | ifc.ifc_buf = buf; |
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75 | if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { |
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76 | _RPC_close(s); |
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77 | return(-1); |
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78 | } |
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79 | again: |
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80 | ifr = ifc.ifc_req; |
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81 | end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); |
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82 | |
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83 | while (ifr < end) { |
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84 | ifreq = *ifr; |
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85 | if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { |
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86 | _RPC_close(s); |
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87 | return(-1); |
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88 | } |
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89 | if (((ifreq.ifr_flags & IFF_UP) && |
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90 | ifr->ifr_addr.sa_family == AF_INET && |
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91 | !(ifreq.ifr_flags & IFF_LOOPBACK)) || |
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92 | (loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK) |
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93 | && (ifr->ifr_addr.sa_family == AF_INET) |
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94 | && (ifreq.ifr_flags & IFF_UP))) { |
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95 | *addr = *((struct sockaddr_in *)&ifr->ifr_addr); |
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96 | addr->sin_port = htons(PMAPPORT); |
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97 | gotit = 1; |
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98 | break; |
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99 | } |
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100 | if (ifr->ifr_addr.sa_len) |
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101 | ifr = (struct ifreq *) ((caddr_t) ifr + |
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102 | ifr->ifr_addr.sa_len - |
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103 | sizeof(struct sockaddr)); |
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104 | ifr++; |
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105 | } |
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106 | if (gotit == 0 && loopback == 0) { |
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107 | loopback = 1; |
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108 | goto again; |
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109 | } |
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110 | (void)_RPC_close(s); |
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111 | return (gotit ? 0 : -1); |
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112 | } |
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