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 <time.h>
  33 #include "nfslib.h"
  34
  35 static void     closedown(int sig);
  36 int     makesock(int port, int proto);
  37
  38 #define _RPCSVC_CLOSEDOWN       120
  39 int     _rpcpmstart = 0;
  40 int     _rpcfdtype = 0;
  41 int     _rpcsvcdirty = 0;
  42
  43 void
  44 rpc_init(char *name, int prog, int vers, void (*dispatch)(), int defport)
  45 {
  46         struct sockaddr_in saddr;
  47         SVCXPRT *transp;
  48         int     sock;
  49         int     asize;
  50
  51         asize = sizeof(saddr);
  52         sock = 0;
  53         if (getsockname(0, (struct sockaddr *) &saddr, &asize) == 0) {
  54                 int ssize = sizeof (int);
  55                 _rpcfdtype = 0;
  56                 if (saddr.sin_family != AF_INET)
  57                         xlog(L_FATAL, "init: stdin is bound to non-inet addr");
  58                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
  59                                 (char *)&_rpcfdtype, &ssize) == -1)
  60                         xlog(L_FATAL, "getsockopt failed: %s", strerror(errno));
  61                 _rpcpmstart = 1;
  62         } else {
  63                 pmap_unset(prog, vers);
  64                 sock = RPC_ANYSOCK;
  65         }
  66
  67         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
  68                 static SVCXPRT *last_transp = NULL;
  69
  70                 if (_rpcfdtype == 0) {
  71                         if (last_transp
  72                             && (!defport || defport == last_transp->xp_port)) {
  73                                 transp = last_transp;
  74                                 goto udp_transport;
  75                         }
  76                         if ((sock = makesock(defport, IPPROTO_UDP)) < 0) {
  77                                 xlog(L_FATAL, "%s: cannot make a UDP socket\n",
  78                                                 name);
  79                         }
  80                 }
  81                 transp = svcudp_create(sock);
  82                 if (transp == NULL) {
  83                         xlog(L_FATAL, "cannot create udp service.");
  84                 }
  85       udp_transport:
  86                 if (!svc_register(transp, prog, vers, dispatch, IPPROTO_UDP)) {
  87                         xlog(L_FATAL, "unable to register (%s, %d, udp).",
  88                                         name, vers);
  89                 }
  90                 last_transp = transp;
  91         }
  92
  93         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
  94                 static SVCXPRT *last_transp = NULL;
  95
  96                 if (_rpcfdtype == 0) {
  97                         if (last_transp
  98                             && (!defport || defport == last_transp->xp_port)) {
  99                                 transp = last_transp;
 100                                 goto tcp_transport;
 101                         }
 102                         if ((sock = makesock(defport, IPPROTO_TCP)) < 0) {
 103                                 xlog(L_FATAL, "%s: cannot make a TCP socket\n",
 104                                                 name);
 105                         }
 106                 }
 107                 transp = svctcp_create(sock, 0, 0);
 108                 if (transp == NULL) {
 109                         xlog(L_FATAL, "cannot create tcp service.");
 110                 }
 111       tcp_transport:
 112                 if (!svc_register(transp, prog, vers, dispatch, IPPROTO_TCP)) {
 113                         xlog(L_FATAL, "unable to register (%s, %d, tcp).",
 114                                         name, vers);
 115                 }
 116                 last_transp = transp;
 117         }
 118
 119         if (_rpcpmstart) {
 120                 signal (SIGALRM, closedown);
 121                 alarm (_RPCSVC_CLOSEDOWN);
 122         }
 123 }
 124
 125 static void closedown(sig)
 126 int sig;
 127 {
 128         (void) signal(sig, closedown);
 129         if (_rpcsvcdirty == 0) {
 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 int makesock(int port, int proto)
 148 {
 149         struct sockaddr_in sin;
 150         int     s;
 151         int     sock_type;
 152         int     val;
 153
 154         sock_type = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
 155         s = socket(AF_INET, sock_type, proto);
 156         if (s < 0) {
 157                 xlog(L_FATAL, "Could not make a socket: %s\n",
 158                                         strerror(errno));
 159                 return (-1);
 160         }
 161         memset((char *) &sin, 0, sizeof(sin));
 162         sin.sin_family = AF_INET;
 163         sin.sin_addr.s_addr = INADDR_ANY;
 164         sin.sin_port = htons(port);
 165
 166         val = 1;
 167         if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
 168                 xlog(L_ERROR, "setsockopt failed: %s\n", strerror(errno));
 169
 170 #if 0
 171         /* I was told it didn't work with gigabit ethernet.
 172            Don't bothet with it.  H.J. */
 173 #ifdef SO_SNDBUF
 174         {
 175                 int sblen, rblen;
 176
 177                 /* 1024 for rpc & transport overheads */
 178                 sblen = rblen = socksz + 1024;
 179                 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &sblen, sizeof sblen) < 0 ||
 180                     setsockopt(s, SOL_SOCKET, SO_RCVBUF, &rblen, sizeof rblen) < 0)
 181                         xlog(L_ERROR, "setsockopt failed: %s\n", strerror(errno));
 182         }
 183 #endif                          /* SO_SNDBUF */
 184 #endif
 185
 186         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) {
 187                 xlog(L_FATAL, "Could not bind name to socket: %s\n",
 188                                         strerror(errno));
 189                 return (-1);
 190         }
 191         return (s);
 192 }
 193
 194
 195 /* Log an incoming call. */
 196 void
 197 rpc_logcall(struct svc_req *rqstp, char *xname, char *arg)
 198 {
 199         char            buff[1024];
 200         int             buflen=sizeof(buff);
 201         int             len;
 202         char            *sp;
 203         int             i;
 204
 205         if (!xlog_enabled(D_CALL))
 206                 return;
 207
 208         sp = buff;
 209         switch (rqstp->rq_cred.oa_flavor) {
 210         case AUTH_NULL:
 211                 sprintf(sp, "NULL");
 212                 break;
 213         case AUTH_UNIX: {
 214                 struct authunix_parms *unix_cred;
 215                 struct tm *tm;
 216
 217                 unix_cred = (struct authunix_parms *) rqstp->rq_clntcred;
 218                 tm = localtime(&unix_cred->aup_time);
 219                 snprintf(sp, buflen, "UNIX %d/%d/%d %02d:%02d:%02d %s %d.%d",
 220                         tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 221                         tm->tm_hour, tm->tm_min, tm->tm_sec,
 222                         unix_cred->aup_machname,
 223                         unix_cred->aup_uid,
 224                         unix_cred->aup_gid);
 225                 sp[buflen-1] = 0;
 226                 len = strlen(sp);
 227                 sp += buflen;
 228                 buflen -= len;
 229                 if ((int) unix_cred->aup_len > 0) {
 230                         snprintf(sp, buflen, "+%d", unix_cred->aup_gids[0]);
 231                         sp[buflen-1] = 0;
 232                         len = strlen(sp);
 233                         sp += buflen;
 234                         buflen -= len;
 235                         for (i = 1; i < unix_cred->aup_len; i++) {
 236                                 snprintf(sp, buflen, ",%d",
 237                                         unix_cred->aup_gids[i]);
 238                                 sp[buflen-1] = 0;
 239                                 len = strlen(sp);
 240                                 sp += buflen;
 241                                 buflen -= len;
 242                         }
 243                 }
 244                 }
 245                 break;
 246         default:
 247                 sprintf(sp, "CRED %d", rqstp->rq_cred.oa_flavor);
 248         }
 249         xlog(D_CALL, "%s [%s]\n\t%s\n", xname, buff, arg);
 250 }