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: @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";*/ |
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32 | /*static char *sccsid = "from: @(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC";*/ |
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33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/pmap_rmt.c,v 1.15 2000/01/27 23:06:40 jasone Exp $"; |
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34 | #endif |
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35 | |
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36 | /* |
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37 | * pmap_rmt.c |
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38 | * Client interface to pmap rpc service. |
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39 | * remote call and broadcast service |
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40 | * |
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41 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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42 | */ |
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43 | |
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44 | #include <rpc/rpc.h> |
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45 | #include <rpc/pmap_prot.h> |
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46 | #include <rpc/pmap_clnt.h> |
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47 | #include <rpc/pmap_rmt.h> |
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48 | #include <sys/socket.h> |
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49 | #include <stdio.h> |
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50 | #include <stdlib.h> |
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51 | #include <unistd.h> |
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52 | #include <errno.h> |
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53 | #include <string.h> |
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54 | #include <net/if.h> |
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55 | #include <sys/ioctl.h> |
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56 | #include <arpa/inet.h> |
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57 | #include <sys/select.h> |
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58 | #define MAX_BROADCAST_SIZE 1400 |
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59 | |
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60 | static struct timeval timeout = { 3, 0 }; |
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61 | |
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62 | /* |
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63 | * pmapper remote-call-service interface. |
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64 | * This routine is used to call the pmapper remote call service |
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65 | * which will look up a service program in the port maps, and then |
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66 | * remotely call that routine with the given parameters. This allows |
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67 | * programs to do a lookup and call in one step. |
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68 | */ |
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69 | enum clnt_stat |
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70 | pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) |
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71 | struct sockaddr_in *addr; |
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72 | u_long prog, vers, proc; |
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73 | xdrproc_t xdrargs, xdrres; |
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74 | caddr_t argsp, resp; |
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75 | struct timeval tout; |
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76 | u_long *port_ptr; |
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77 | { |
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78 | int socket = -1; |
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79 | register CLIENT *client; |
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80 | struct rmtcallargs a; |
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81 | struct rmtcallres r; |
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82 | enum clnt_stat stat; |
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83 | |
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84 | addr->sin_port = htons(PMAPPORT); |
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85 | client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); |
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86 | if (client != (CLIENT *)NULL) { |
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87 | a.prog = prog; |
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88 | a.vers = vers; |
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89 | a.proc = proc; |
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90 | a.args_ptr = argsp; |
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91 | a.xdr_args = xdrargs; |
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92 | r.port_ptr = port_ptr; |
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93 | r.results_ptr = resp; |
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94 | r.xdr_results = xdrres; |
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95 | stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, |
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96 | xdr_rmtcallres, &r, tout); |
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97 | CLNT_DESTROY(client); |
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98 | } else { |
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99 | stat = RPC_FAILED; |
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100 | } |
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101 | if (socket != -1) |
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102 | (void)_RPC_close(socket); |
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103 | addr->sin_port = 0; |
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104 | return (stat); |
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105 | } |
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106 | |
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107 | |
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108 | /* |
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109 | * XDR remote call arguments |
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110 | * written for XDR_ENCODE direction only |
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111 | */ |
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112 | bool_t |
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113 | xdr_rmtcall_args(xdrs, cap) |
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114 | register XDR *xdrs; |
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115 | register struct rmtcallargs *cap; |
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116 | { |
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117 | u_int lenposition, argposition, position; |
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118 | |
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119 | if (xdr_u_long(xdrs, &(cap->prog)) && |
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120 | xdr_u_long(xdrs, &(cap->vers)) && |
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121 | xdr_u_long(xdrs, &(cap->proc))) { |
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122 | lenposition = XDR_GETPOS(xdrs); |
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123 | if (! xdr_u_long(xdrs, &(cap->arglen))) |
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124 | return (FALSE); |
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125 | argposition = XDR_GETPOS(xdrs); |
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126 | if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) |
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127 | return (FALSE); |
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128 | position = XDR_GETPOS(xdrs); |
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129 | cap->arglen = (u_long)position - (u_long)argposition; |
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130 | XDR_SETPOS(xdrs, lenposition); |
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131 | if (! xdr_u_long(xdrs, &(cap->arglen))) |
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132 | return (FALSE); |
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133 | XDR_SETPOS(xdrs, position); |
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134 | return (TRUE); |
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135 | } |
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136 | return (FALSE); |
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137 | } |
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138 | |
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139 | /* |
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140 | * XDR remote call results |
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141 | * written for XDR_DECODE direction only |
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142 | */ |
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143 | bool_t |
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144 | xdr_rmtcallres(xdrs, crp) |
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145 | register XDR *xdrs; |
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146 | register struct rmtcallres *crp; |
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147 | { |
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148 | caddr_t port_ptr; |
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149 | |
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150 | port_ptr = (caddr_t)crp->port_ptr; |
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151 | if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), |
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152 | xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { |
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153 | crp->port_ptr = (u_long *)port_ptr; |
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154 | return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); |
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155 | } |
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156 | return (FALSE); |
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157 | } |
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158 | |
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159 | |
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160 | /* |
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161 | * The following is kludged-up support for simple rpc broadcasts. |
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162 | * Someday a large, complicated system will replace these trivial |
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163 | * routines which only support udp/ip . |
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164 | */ |
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165 | |
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166 | static int |
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167 | getbroadcastnets(addrs, sock, buf) |
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168 | struct in_addr *addrs; |
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169 | int sock; /* any valid socket will do */ |
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170 | char *buf; /* why allocxate more when we can use existing... */ |
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171 | { |
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172 | struct ifconf ifc; |
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173 | struct ifreq ifreq, *ifr; |
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174 | struct sockaddr_in *sin; |
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175 | struct in_addr addr; |
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176 | char *cp, *cplim; |
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177 | int n, i = 0; |
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178 | |
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179 | ifc.ifc_len = UDPMSGSIZE; |
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180 | ifc.ifc_buf = buf; |
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181 | if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { |
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182 | perror("broadcast: ioctl (get interface configuration)"); |
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183 | return (0); |
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184 | } |
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185 | #define max(a, b) (a > b ? a : b) |
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186 | #define size(p) max((p).sa_len, sizeof(p)) |
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187 | cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ |
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188 | for (cp = buf; cp < cplim; |
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189 | cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { |
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190 | ifr = (struct ifreq *)cp; |
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191 | if (ifr->ifr_addr.sa_family != AF_INET) |
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192 | continue; |
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193 | ifreq = *ifr; |
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194 | if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { |
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195 | perror("broadcast: ioctl (get interface flags)"); |
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196 | continue; |
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197 | } |
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198 | if ((ifreq.ifr_flags & IFF_BROADCAST) && |
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199 | (ifreq.ifr_flags & IFF_UP)) { |
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200 | sin = (struct sockaddr_in *)&ifr->ifr_addr; |
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201 | #ifdef SIOCGIFBRDADDR /* 4.3BSD */ |
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202 | if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { |
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203 | addr = |
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204 | inet_makeaddr(inet_netof(sin->sin_addr), |
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205 | INADDR_ANY); |
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206 | } else { |
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207 | addr = ((struct sockaddr_in*) |
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208 | &ifreq.ifr_addr)->sin_addr; |
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209 | } |
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210 | #else /* 4.2 BSD */ |
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211 | addr = inet_makeaddr(inet_netof(sin->sin_addr), |
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212 | INADDR_ANY); |
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213 | #endif |
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214 | for (n=i-1; n>=0; n--) { |
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215 | if (addr.s_addr == addrs[n].s_addr) |
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216 | break; |
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217 | } |
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218 | if (n<0) { |
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219 | addrs[i++] = addr; |
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220 | } |
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221 | } |
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222 | } |
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223 | return (i); |
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224 | } |
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225 | |
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226 | typedef bool_t (*resultproc_t)(); |
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227 | |
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228 | enum clnt_stat |
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229 | clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) |
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230 | u_long prog; /* program number */ |
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231 | u_long vers; /* version number */ |
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232 | u_long proc; /* procedure number */ |
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233 | xdrproc_t xargs; /* xdr routine for args */ |
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234 | caddr_t argsp; /* pointer to args */ |
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235 | xdrproc_t xresults; /* xdr routine for results */ |
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236 | caddr_t resultsp; /* pointer to results */ |
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237 | resultproc_t eachresult; /* call with each result obtained */ |
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238 | { |
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239 | enum clnt_stat stat = RPC_SUCCESS; /* to avoid warning */ |
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240 | AUTH *unix_auth = authunix_create_default(); |
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241 | XDR xdr_stream; |
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242 | register XDR *xdrs = &xdr_stream; |
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243 | int outlen, inlen, fromlen, nets; |
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244 | register int sock; |
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245 | int on = 1; |
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246 | fd_set *fds = 0, readfds; /* initialized to avoid warning */ |
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247 | register int i; |
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248 | bool_t done = FALSE; |
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249 | register u_long xid; |
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250 | u_long port; |
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251 | struct in_addr addrs[20]; |
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252 | struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ |
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253 | struct rmtcallargs a; |
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254 | struct rmtcallres r; |
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255 | struct rpc_msg msg; |
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256 | struct timeval t, tv; |
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257 | char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; |
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258 | static u_int32_t disrupt; |
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259 | |
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260 | if (disrupt == 0) |
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261 | disrupt = (u_int32_t)(long)resultsp; |
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262 | |
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263 | /* |
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264 | * initialization: create a socket, a broadcast address, and |
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265 | * preserialize the arguments into a send buffer. |
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266 | */ |
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267 | if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { |
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268 | perror("Cannot create socket for broadcast rpc"); |
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269 | stat = RPC_CANTSEND; |
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270 | goto done_broad; |
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271 | } |
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272 | #ifdef SO_BROADCAST |
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273 | if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { |
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274 | perror("Cannot set socket option SO_BROADCAST"); |
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275 | stat = RPC_CANTSEND; |
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276 | goto done_broad; |
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277 | } |
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278 | #endif /* def SO_BROADCAST */ |
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279 | if (sock + 1 > FD_SETSIZE) { |
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280 | int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); |
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281 | fds = (fd_set *)malloc(bytes); |
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282 | if (fds == NULL) { |
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283 | stat = RPC_CANTSEND; |
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284 | goto done_broad; |
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285 | } |
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286 | memset(fds, 0, bytes); |
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287 | } else { |
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288 | fds = &readfds; |
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289 | FD_ZERO(fds); |
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290 | } |
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291 | |
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292 | nets = getbroadcastnets(addrs, sock, inbuf); |
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293 | memset(&baddr, 0, sizeof (baddr)); |
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294 | baddr.sin_len = sizeof(struct sockaddr_in); |
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295 | baddr.sin_family = AF_INET; |
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296 | baddr.sin_port = htons(PMAPPORT); |
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297 | baddr.sin_addr.s_addr = htonl(INADDR_ANY); |
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298 | (void)gettimeofday(&t, (struct timezone *)0); |
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299 | msg.rm_xid = xid = (++disrupt) ^ getpid() ^ t.tv_sec ^ t.tv_usec; |
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300 | t.tv_usec = 0; |
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301 | msg.rm_direction = CALL; |
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302 | msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; |
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303 | msg.rm_call.cb_prog = PMAPPROG; |
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304 | msg.rm_call.cb_vers = PMAPVERS; |
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305 | msg.rm_call.cb_proc = PMAPPROC_CALLIT; |
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306 | msg.rm_call.cb_cred = unix_auth->ah_cred; |
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307 | msg.rm_call.cb_verf = unix_auth->ah_verf; |
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308 | a.prog = prog; |
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309 | a.vers = vers; |
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310 | a.proc = proc; |
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311 | a.xdr_args = xargs; |
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312 | a.args_ptr = argsp; |
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313 | r.port_ptr = &port; |
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314 | r.xdr_results = xresults; |
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315 | r.results_ptr = resultsp; |
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316 | xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); |
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317 | if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { |
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318 | stat = RPC_CANTENCODEARGS; |
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319 | goto done_broad; |
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320 | } |
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321 | outlen = (int)xdr_getpos(xdrs); |
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322 | xdr_destroy(xdrs); |
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323 | /* |
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324 | * Basic loop: broadcast a packet and wait a while for response(s). |
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325 | * The response timeout grows larger per iteration. |
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326 | * |
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327 | * XXX This will loop about 5 times the stop. If there are |
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328 | * lots of signals being received by the process it will quit |
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329 | * send them all in one quick burst, not paying attention to |
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330 | * the intended function of sending them slowly over half a |
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331 | * minute or so |
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332 | */ |
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333 | for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { |
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334 | for (i = 0; i < nets; i++) { |
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335 | baddr.sin_addr = addrs[i]; |
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336 | if (sendto(sock, outbuf, outlen, 0, |
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337 | (struct sockaddr *)&baddr, |
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338 | sizeof (struct sockaddr)) != outlen) { |
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339 | perror("Cannot send broadcast packet"); |
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340 | stat = RPC_CANTSEND; |
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341 | goto done_broad; |
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342 | } |
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343 | } |
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344 | if (eachresult == NULL) { |
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345 | stat = RPC_SUCCESS; |
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346 | goto done_broad; |
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347 | } |
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348 | recv_again: |
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349 | msg.acpted_rply.ar_verf = _null_auth; |
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350 | msg.acpted_rply.ar_results.where = (caddr_t)&r; |
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351 | msg.acpted_rply.ar_results.proc = xdr_rmtcallres; |
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352 | /* XXX we know the other bits are still clear */ |
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353 | FD_SET(sock, fds); |
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354 | tv = t; /* for select() that copies back */ |
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355 | switch (select(sock + 1, fds, NULL, NULL, &tv)) { |
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356 | |
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357 | case 0: /* timed out */ |
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358 | stat = RPC_TIMEDOUT; |
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359 | continue; |
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360 | |
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361 | case -1: /* some kind of error */ |
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362 | if (errno == EINTR) |
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363 | goto recv_again; |
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364 | perror("Broadcast select problem"); |
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365 | stat = RPC_CANTRECV; |
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366 | goto done_broad; |
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367 | |
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368 | } /* end of select results switch */ |
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369 | try_again: |
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370 | fromlen = sizeof(struct sockaddr); |
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371 | inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, |
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372 | (struct sockaddr *)&raddr, &fromlen); |
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373 | if (inlen < 0) { |
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374 | if (errno == EINTR) |
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375 | goto try_again; |
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376 | perror("Cannot receive reply to broadcast"); |
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377 | stat = RPC_CANTRECV; |
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378 | goto done_broad; |
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379 | } |
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380 | if (inlen < sizeof(u_int32_t)) |
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381 | goto recv_again; |
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382 | /* |
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383 | * see if reply transaction id matches sent id. |
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384 | * If so, decode the results. |
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385 | */ |
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386 | xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); |
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387 | if (xdr_replymsg(xdrs, &msg)) { |
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388 | if ((msg.rm_xid == xid) && |
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389 | (msg.rm_reply.rp_stat == MSG_ACCEPTED) && |
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390 | (msg.acpted_rply.ar_stat == SUCCESS)) { |
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391 | raddr.sin_port = htons((u_short)port); |
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392 | done = (*eachresult)(resultsp, &raddr); |
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393 | } |
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394 | /* otherwise, we just ignore the errors ... */ |
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395 | } |
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396 | xdrs->x_op = XDR_FREE; |
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397 | msg.acpted_rply.ar_results.proc = xdr_void; |
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398 | (void)xdr_replymsg(xdrs, &msg); |
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399 | (void)(*xresults)(xdrs, resultsp); |
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400 | xdr_destroy(xdrs); |
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401 | if (done) { |
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402 | stat = RPC_SUCCESS; |
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403 | goto done_broad; |
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404 | } else { |
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405 | goto recv_again; |
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406 | } |
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407 | } |
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408 | done_broad: |
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409 | if (fds != &readfds) |
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410 | free(fds); |
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411 | if (sock >= 0) |
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412 | (void)_RPC_close(sock); |
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413 | AUTH_DESTROY(unix_auth); |
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414 | return (stat); |
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415 | } |
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