1 | /* $NetBSD: bindresvport.c,v 1.19 2000/07/06 03:03:59 christos Exp $ */ |
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2 | |
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3 | /* |
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4 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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5 | * unrestricted use provided that this legend is included on all tape |
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6 | * media and as a part of the software program in whole or part. Users |
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7 | * may copy or modify Sun RPC without charge, but are not authorized |
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8 | * to license or distribute it to anyone else except as part of a product or |
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9 | * program developed by the user. |
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10 | * |
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11 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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12 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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13 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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14 | * |
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15 | * Sun RPC is provided with no support and without any obligation on the |
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16 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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17 | * modification or enhancement. |
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18 | * |
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19 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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20 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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21 | * OR ANY PART THEREOF. |
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22 | * |
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23 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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24 | * or profits or other special, indirect and consequential damages, even if |
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25 | * Sun has been advised of the possibility of such damages. |
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26 | * |
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27 | * Sun Microsystems, Inc. |
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28 | * 2550 Garcia Avenue |
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29 | * Mountain View, California 94043 |
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30 | */ |
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31 | |
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32 | #if defined(LIBC_SCCS) && !defined(lint) |
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33 | /*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/ |
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34 | /*static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";*/ |
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35 | /*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */ |
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36 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/bindresvport.c,v 1.12 2000/01/26 09:02:42 shin Exp $"; |
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37 | #endif |
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38 | |
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39 | /* |
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40 | * Copyright (c) 1987 by Sun Microsystems, Inc. |
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41 | * |
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42 | * Portions Copyright(C) 1996, Jason Downs. All rights reserved. |
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43 | */ |
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44 | |
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45 | #ifdef HAVE_CONFIG_H |
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46 | #include "config.h" |
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47 | #endif |
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48 | |
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49 | #include <sys/types.h> |
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50 | #include <sys/socket.h> |
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51 | |
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52 | #include <netinet/in.h> |
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53 | |
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54 | #include <errno.h> |
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55 | #include <string.h> |
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56 | #include <unistd.h> |
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57 | |
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58 | #include <rpc/rpc.h> |
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59 | |
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60 | /* |
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61 | * Bind a socket to a privileged IP port |
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62 | */ |
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63 | int |
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64 | bindresvport( |
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65 | int sd, |
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66 | struct sockaddr_in *sin) |
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67 | { |
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68 | return bindresvport_sa(sd, (struct sockaddr *)sin); |
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69 | } |
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70 | |
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71 | /* |
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72 | * Bind a socket to a privileged IP port |
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73 | */ |
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74 | int |
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75 | bindresvport_sa( |
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76 | int sd, |
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77 | struct sockaddr *sa) |
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78 | { |
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79 | int old, error, af; |
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80 | struct sockaddr myaddr; |
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81 | struct sockaddr_in *sin; |
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82 | #ifdef INET6 |
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83 | struct sockaddr_in6 *sin6; |
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84 | #endif |
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85 | int proto, portrange, portlow; |
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86 | u_int16_t port; |
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87 | socklen_t salen; |
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88 | |
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89 | if (sa == NULL) { |
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90 | salen = sizeof(myaddr); |
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91 | sa = (struct sockaddr *)&myaddr; |
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92 | |
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93 | if (getsockname(sd, sa, &salen) == -1) |
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94 | return -1; /* errno is correctly set */ |
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95 | |
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96 | af = sa->sa_family; |
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97 | memset(&myaddr, 0, salen); |
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98 | } else |
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99 | af = sa->sa_family; |
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100 | |
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101 | switch (af) { |
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102 | case AF_INET: |
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103 | proto = IPPROTO_IP; |
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104 | portrange = IP_PORTRANGE; |
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105 | portlow = IP_PORTRANGE_LOW; |
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106 | sin = (struct sockaddr_in *)sa; |
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107 | salen = sizeof(struct sockaddr_in); |
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108 | port = sin->sin_port; |
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109 | break; |
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110 | #ifdef INET6 |
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111 | case AF_INET6: |
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112 | proto = IPPROTO_IPV6; |
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113 | portrange = IPV6_PORTRANGE; |
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114 | portlow = IPV6_PORTRANGE_LOW; |
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115 | sin6 = (struct sockaddr_in6 *)sa; |
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116 | salen = sizeof(struct sockaddr_in6); |
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117 | port = sin6->sin6_port; |
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118 | break; |
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119 | #endif |
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120 | default: |
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121 | errno = EPFNOSUPPORT; |
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122 | return (-1); |
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123 | } |
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124 | sa->sa_family = af; |
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125 | sa->sa_len = salen; |
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126 | |
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127 | if (port == 0) { |
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128 | socklen_t oldlen = sizeof(old); |
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129 | |
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130 | error = getsockopt(sd, proto, portrange, &old, &oldlen); |
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131 | if (error < 0) |
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132 | return (error); |
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133 | |
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134 | error = setsockopt(sd, proto, portrange, &portlow, |
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135 | sizeof(portlow)); |
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136 | if (error < 0) |
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137 | return (error); |
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138 | } |
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139 | |
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140 | error = bind(sd, sa, salen); |
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141 | |
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142 | if (port == 0) { |
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143 | int saved_errno = errno; |
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144 | |
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145 | if (error) { |
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146 | if (setsockopt(sd, proto, portrange, &old, |
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147 | sizeof(old)) < 0) |
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148 | errno = saved_errno; |
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149 | return (error); |
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150 | } |
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151 | |
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152 | if (sa != (struct sockaddr *)&myaddr) { |
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153 | /* Hmm, what did the kernel assign? */ |
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154 | if (getsockname(sd, sa, &salen) < 0) |
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155 | errno = saved_errno; |
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156 | return (error); |
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157 | } |
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158 | } |
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159 | return (error); |
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160 | } |
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