support/nfs/rpcmisc.c

   1 /*
   2  * support/nfs/rpcmisc.c
   3  *
   4  * Miscellaneous functions for RPC startup and shutdown.
   5  * This code is partially snarfed from rpcgen -s tcp -s udp,
   6  * partly written by Mark Shand, Donald Becker, and Rick
   7  * Sladkey. It was tweaked slightly by Olaf Kirch to be
   8  * usable by both unfsd and mountd.
   9  *
  10  * This software may be used for any purpose provided
  11  * the above copyright notice is retained.  It is supplied
  12  * as is, with no warranty expressed or implied.
  13  */
  14
  15 #include "config.h"
  16
  17 #include <sys/types.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/stat.h>
  20 #include <sys/socket.h>
  21 #include <rpc/rpc.h>
  22 #include <rpc/pmap_clnt.h>
  23 #include <netinet/in.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <signal.h>
  28 #include <fcntl.h>
  29 #include <memory.h>
  30 #include <errno.h>
  31 #include <unistd.h>
  32 #include "nfslib.h"
  33
  34 static void     closedown(int sig);
  35 static int      makesock(int port, int proto);
  36
  37 #define _RPCSVC_CLOSEDOWN       120
  38 int     _rpcpmstart = 0;
  39 int     _rpcfdtype = 0;
  40 int     _rpcsvcdirty = 0;
  41
  42 void
  43 rpc_init(char *name, int prog, int vers, void (*dispatch)(), int defport)
  44 {
  45         struct sockaddr_in saddr;
  46         SVCXPRT *transp;
  47         int     sock;
  48         int     asize;
  49
  50         asize = sizeof(saddr);
  51         sock = 0;
  52         if (getsockname(0, (struct sockaddr *) &saddr, &asize) == 0) {
  53                 int ssize = sizeof (int);
  54                 _rpcfdtype = 0;
  55                 if (saddr.sin_family != AF_INET)
  56                         xlog(L_FATAL, "init: stdin is bound to non-inet addr");
  57                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
  58                                 (char *)&_rpcfdtype, &ssize) == -1)
  59                         xlog(L_FATAL, "getsockopt failed: %s", strerror(errno));
  60                 _rpcpmstart = 1;
  61         } else {
  62                 pmap_unset(prog, vers);
  63                 sock = RPC_ANYSOCK;
  64         }
  65
  66         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
  67                 static SVCXPRT *last_transp = NULL;
  68
  69                 if (_rpcfdtype == 0) {
  70                         if (last_transp
  71                             && (!defport || defport == last_transp->xp_port)) {
  72                                 transp = last_transp;
  73                                 goto udp_transport;
  74                         }
  75                         if ((sock = makesock(defport, IPPROTO_UDP)) < 0) {
  76                                 xlog(L_FATAL, "%s: cannot make a UDP socket\n",
  77                                                 name);
  78                         }
  79                 }
  80                 transp = svcudp_create(sock);
  81                 if (transp == NULL) {
  82                         xlog(L_FATAL, "cannot create udp service.");
  83                 }
  84       udp_transport:
  85                 if (!svc_register(transp, prog, vers, dispatch, IPPROTO_UDP)) {
  86                         xlog(L_FATAL, "unable to register (%s, %d, udp).",
  87                                         name, vers);
  88                 }
  89                 last_transp = transp;
  90         }
  91
  92         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
  93                 static SVCXPRT *last_transp = NULL;
  94
  95                 if (_rpcfdtype == 0) {
  96                         if (last_transp
  97                             && (!defport || defport == last_transp->xp_port)) {
  98                                 transp = last_transp;
  99                                 goto tcp_transport;
 100                         }
 101                         if ((sock = makesock(defport, IPPROTO_TCP)) < 0) {
 102                                 xlog(L_FATAL, "%s: cannot make a TCP socket\n",
 103                                                 name);
 104                         }
 105                 }
 106                 transp = svctcp_create(sock, 0, 0);
 107                 if (transp == NULL) {
 108                         xlog(L_FATAL, "cannot create tcp service.");
 109                 }
 110       tcp_transport:
 111                 if (!svc_register(transp, prog, vers, dispatch, IPPROTO_TCP)) {
 112                         xlog(L_FATAL, "unable to register (%s, %d, tcp).",
 113                                         name, vers);
 114                 }
 115                 last_transp = transp;
 116         }
 117
 118         if (_rpcpmstart) {
 119                 signal (SIGALRM, closedown);
 120                 alarm (_RPCSVC_CLOSEDOWN);
 121         }
 122 }
 123
 124 static void closedown(sig)
 125 int sig;
 126 {
 127         (void) signal(sig, closedown);
 128         if (_rpcsvcdirty == 0) {
 129                 extern fd_set svc_fdset;
 130                 static int size;
 131                 int i, openfd;
 132
 133                 if (_rpcfdtype == SOCK_DGRAM)
 134                         exit(0);
 135                 if (size == 0) {
 136                         size = getdtablesize();
 137                 }
 138                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 139                         if (FD_ISSET(i, &svc_fdset))
 140                                 openfd++;
 141                 if (openfd <= 1)
 142                         exit(0);
 143         }
 144         (void) alarm(_RPCSVC_CLOSEDOWN);
 145 }
 146
 147 static int makesock(port, proto)
 148 int port;
 149 int proto;
 150 {
 151         struct sockaddr_in sin;
 152         int     s;
 153         int     sock_type;
 154         int     val;
 155
 156         sock_type = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
 157         s = socket(AF_INET, sock_type, proto);
 158         if (s < 0) {
 159                 xlog(L_FATAL, "Could not make a socket: %s\n",
 160                                         strerror(errno));
 161                 return (-1);
 162         }
 163         memset((char *) &sin, 0, sizeof(sin));
 164         sin.sin_family = AF_INET;
 165         sin.sin_addr.s_addr = INADDR_ANY;
 166         sin.sin_port = htons(port);
 167
 168         val = 1;
 169         if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
 170                 xlog(L_ERROR, "setsockopt failed: %s\n", strerror(errno));
 171
 172 #if 0
 173         /* I was told it didn't work with gigabit ethernet.
 174            Don't bothet with it.  H.J. */
 175 #ifdef SO_SNDBUF
 176         {
 177                 int sblen, rblen;
 178
 179                 /* 1024 for rpc & transport overheads */
 180                 sblen = rblen = socksz + 1024;
 181                 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &sblen, sizeof sblen) < 0 ||
 182                     setsockopt(s, SOL_SOCKET, SO_RCVBUF, &rblen, sizeof rblen) < 0)
 183                         xlog(L_ERROR, "setsockopt failed: %s\n", strerror(errno));
 184         }
 185 #endif                          /* SO_SNDBUF */
 186 #endif
 187
 188         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) {
 189                 xlog(L_FATAL, "Could not bind name to socket: %s\n",
 190                                         strerror(errno));
 191                 return (-1);
 192         }
 193         return (s);
 194 }
 195
 196
 197 /* Log an incoming call. */
 198 void
 199 rpc_logcall(struct svc_req *rqstp, char *xname, char *arg)
 200 {
 201         char            buff[1024];
 202         int             buflen=sizeof(buff);
 203         int             len;
 204         char            *sp;
 205         int             i;
 206
 207         if (!xlog_enabled(D_CALL))
 208                 return;
 209
 210         sp = buff;
 211         switch (rqstp->rq_cred.oa_flavor) {
 212         case AUTH_NULL:
 213                 sprintf(sp, "NULL");
 214                 break;
 215         case AUTH_UNIX: {
 216                 struct authunix_parms *unix_cred;
 217                 struct tm *tm;
 218
 219                 unix_cred = (struct authunix_parms *) rqstp->rq_clntcred;
 220                 tm = localtime(&unix_cred->aup_time);
 221                 snprintf(sp, buflen, "UNIX %d/%d/%d %02d:%02d:%02d %s %d.%d",
 222                         tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 223                         tm->tm_hour, tm->tm_min, tm->tm_sec,
 224                         unix_cred->aup_machname,
 225                         unix_cred->aup_uid,
 226                         unix_cred->aup_gid);
 227                 sp[buflen-1] = 0;
 228                 len = strlen(sp);
 229                 sp += buflen;
 230                 buflen -= len;
 231                 if ((int) unix_cred->aup_len > 0) {
 232                         snprintf(sp, buflen, "+%d", unix_cred->aup_gids[0]);
 233                         sp[buflen-1] = 0;
 234                         len = strlen(sp);
 235                         sp += buflen;
 236                         buflen -= len;
 237                         for (i = 1; i < unix_cred->aup_len; i++) {
 238                                 snprintf(sp, buflen, ",%d",
 239                                         unix_cred->aup_gids[i]);
 240                                 sp[buflen-1] = 0;
 241                                 len = strlen(sp);
 242                                 sp += buflen;
 243                                 buflen -= len;
 244                         }
 245                 }
 246                 }
 247                 break;
 248         default:
 249                 sprintf(sp, "CRED %d", rqstp->rq_cred.oa_flavor);
 250         }
 251         xlog(D_CALL, "%s [%s]\n\t%s\n", xname, buff, arg);
 252 }