support/nfs/nfssvc.c

   1 /*
   2  * support/nfs/nfssvc.c
   3  *
   4  * Run an NFS daemon.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <sys/socket.h>
  14 #include <netinet/in.h>
  15 #include <arpa/inet.h>
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18 #include <errno.h>
  19 #include <syslog.h>
  20
  21
  22 #include "nfslib.h"
  23
  24 #define NFSD_PORTS_FILE     "/proc/fs/nfsd/portlist"
  25 #define NFSD_VERS_FILE    "/proc/fs/nfsd/versions"
  26 #define NFSD_THREAD_FILE  "/proc/fs/nfsd/threads"
  27
  28 static void
  29 nfssvc_setfds(int port, unsigned int ctlbits, char *haddr)
  30 {
  31         int fd, on=1;
  32         char buf[BUFSIZ];
  33         int udpfd = -1, tcpfd = -1;
  34         struct sockaddr_in sin;
  35
  36         fd = open(NFSD_PORTS_FILE, O_WRONLY);
  37         if (fd < 0)
  38                 return;
  39         sin.sin_family = AF_INET;
  40         sin.sin_port   = htons(port);
  41         sin.sin_addr.s_addr =  inet_addr(haddr);
  42
  43         if (NFSCTL_UDPISSET(ctlbits)) {
  44                 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  45                 if (udpfd < 0) {
  46                         syslog(LOG_ERR, "nfssvc: unable to create UPD socket: "
  47                                 "errno %d (%s)\n", errno, strerror(errno));
  48                         exit(1);
  49                 }
  50                 if (bind(udpfd, (struct  sockaddr  *)&sin, sizeof(sin)) < 0){
  51                         syslog(LOG_ERR, "nfssvc: unable to bind UPD socket: "
  52                                 "errno %d (%s)\n", errno, strerror(errno));
  53                         exit(1);
  54                 }
  55         }
  56
  57         if (NFSCTL_TCPISSET(ctlbits)) {
  58                 tcpfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  59                 if (tcpfd < 0) {
  60                         syslog(LOG_ERR, "nfssvc: unable to createt tcp socket: "
  61                                 "errno %d (%s)\n", errno, strerror(errno));
  62                         exit(1);
  63                 }
  64                 if (setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) {
  65                         syslog(LOG_ERR, "nfssvc: unable to set SO_REUSEADDR: "
  66                                 "errno %d (%s)\n", errno, strerror(errno));
  67                         exit(1);
  68                 }
  69                 if (bind(tcpfd, (struct  sockaddr  *)&sin, sizeof(sin)) < 0){
  70                         syslog(LOG_ERR, "nfssvc: unable to bind TCP socket: "
  71                                 "errno %d (%s)\n", errno, strerror(errno));
  72                         exit(1);
  73                 }
  74                 if (listen(tcpfd, 64) < 0){
  75                         syslog(LOG_ERR, "nfssvc: unable to create listening socket: "
  76                                 "errno %d (%s)\n", errno, strerror(errno));
  77                         exit(1);
  78                 }
  79         }
  80         if (udpfd >= 0) {
  81                 snprintf(buf, BUFSIZ,"%d\n", udpfd);
  82                 if (write(fd, buf, strlen(buf)) != strlen(buf)) {
  83                         syslog(LOG_ERR,
  84                                "nfssvc: writting fds to kernel failed: errno %d (%s)",
  85                                errno, strerror(errno));
  86                 }
  87                 close(fd);
  88                 fd = -1;
  89         }
  90         if (tcpfd >= 0) {
  91                 if (fd < 0)
  92                         fd = open(NFSD_PORTS_FILE, O_WRONLY);
  93                 snprintf(buf, BUFSIZ,"%d\n", tcpfd);
  94                 if (write(fd, buf, strlen(buf)) != strlen(buf)) {
  95                         syslog(LOG_ERR,
  96                                "nfssvc: writting fds to kernel failed: errno %d (%s)",
  97                                errno, strerror(errno));
  98                 }
  99         }
 100         close(fd);
 101
 102         return;
 103 }
 104 static void
 105 nfssvc_versbits(unsigned int ctlbits)
 106 {
 107         int fd, n, off;
 108         char buf[BUFSIZ], *ptr;
 109
 110         ptr = buf;
 111         off = 0;
 112         fd = open(NFSD_VERS_FILE, O_WRONLY);
 113         if (fd < 0)
 114                 return;
 115
 116         for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
 117                 if (NFSCTL_VERISSET(ctlbits, n))
 118                     off += snprintf(ptr+off, BUFSIZ - off, "+%d ", n);
 119                 else
 120                     off += snprintf(ptr+off, BUFSIZ - off, "-%d ", n);
 121         }
 122         snprintf(ptr+off, BUFSIZ - off, "\n");
 123         if (write(fd, buf, strlen(buf)) != strlen(buf)) {
 124                 syslog(LOG_ERR, "nfssvc: Setting version failed: errno %d (%s)",
 125                         errno, strerror(errno));
 126         }
 127         close(fd);
 128
 129         return;
 130 }
 131 int
 132 nfssvc(int port, int nrservs, unsigned int versbits, unsigned protobits,
 133         char *haddr)
 134 {
 135         struct nfsctl_arg       arg;
 136         int fd;
 137
 138         /* Note: must set versions before fds so that
 139          * the ports get registered with portmap against correct
 140          * versions
 141          */
 142         nfssvc_versbits(versbits);
 143         nfssvc_setfds(port, protobits, haddr);
 144
 145         fd = open(NFSD_THREAD_FILE, O_WRONLY);
 146         if (fd < 0)
 147                 fd = open("/proc/fs/nfs/threads", O_WRONLY);
 148         if (fd >= 0) {
 149                 /* 2.5+ kernel with nfsd filesystem mounted.
 150                  * Just write the number in.
 151                  * Cannot handle port number yet, but does anyone care?
 152                  */
 153                 char buf[20];
 154                 int n;
 155                 snprintf(buf, 20,"%d\n", nrservs);
 156                 n = write(fd, buf, strlen(buf));
 157                 close(fd);
 158                 if (n != strlen(buf))
 159                         return -1;
 160                 else
 161                         return 0;
 162         }
 163
 164         arg.ca_version = NFSCTL_VERSION;
 165         arg.ca_svc.svc_nthreads = nrservs;
 166         arg.ca_svc.svc_port = port;
 167         return nfsctl(NFSCTL_SVC, &arg, NULL);
 168 }