src/sys/rmtsyss.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /* Daemon that implements remote procedure call service for non-vendor system
  11  * calls (currently setpag and pioctl). The AFS cache manager daemon, afsd,
  12  * currently fires up this module, when the "-rmtsys" flag is given.
  13  * This module resides in the lib/afs/librmtsys.a library.
  14  */
  15 #include <afsconfig.h>
  16 #include <afs/param.h>
  17
  18 #include <roken.h>
  19
  20 #include <afs/vice.h>
  21 #include <rx/xdr.h>
  22
  23 /*#include <afs/cellconfig.h>*/
  24 #include "rmtsys.h"
  25 #include "sys_prototypes.h"
  26
  27 #define NFS_EXPORTER        1   /* To probably handle more later */
  28 #define PSETPAG             110 /* Also defined in afs/afs_pioctl.c */
  29 #define PIOCTL_HEADER       6   /* # of words prepended to special pioctl */
  30 #define PSetClientContext   99  /* Sets up caller's creds */
  31 #define N_SECURITY_OBJECTS  1   /* No real security yet */
  32
  33 #define SETCLIENTCONTEXT(BLOB, host, uid, group0, group1, cmd, exportertype) { \
  34            (BLOB)[0] = (host); \
  35            (BLOB)[1] = (uid); \
  36            (BLOB)[2] = (group0); \
  37            (BLOB)[3] = (group1); \
  38            (BLOB)[4] = (cmd); \
  39            (BLOB)[5] = (exportertype); \
  40 }
  41
  42
  43 /* Main routine of the remote AFS system call server. The calling process will
  44  * never return; this is currently called from afsd (when "-rmtsys" is passed
  45  * as a parameter) */
  46 void
  47 rmtsysd(void)
  48 {
  49 /*  void catchsig(int); */
  50     struct rx_securityClass *(securityObjects[N_SECURITY_OBJECTS]);
  51     struct rx_service *service;
  52
  53     /*
  54      * Ignore SIGHUP signal since apparently is sent to the processes that
  55      * start up from /etc/rc for some systems like hpux and aix3.1...
  56      */
  57     signal(SIGHUP, SIG_IGN);
  58
  59     /* Initialize the rx-based RMTSYS server */
  60     if (rx_Init(htons(AFSCONF_RMTSYSPORT)) < 0)
  61         rmt_Quit("rx_init");
  62     securityObjects[RX_SECIDX_NULL] = rxnull_NewServerSecurityObject();
  63     if (securityObjects[RX_SECIDX_NULL] == (struct rx_securityClass *)0)
  64         rmt_Quit("rxnull_NewServerSecurityObject");
  65     service =
  66         rx_NewService(0, RMTSYS_SERVICEID, AFSCONF_RMTSYSSERVICE,
  67                       securityObjects, N_SECURITY_OBJECTS,
  68                       RMTSYS_ExecuteRequest);
  69     if (service == NULL)
  70         rmt_Quit("rx_NewService");
  71     /* One may wish to tune some default RX params for better performance
  72      * at some point... */
  73     rx_SetMaxProcs(service, 2);
  74     rx_StartServer(1);          /* Donate this process to the server process pool */
  75 }
  76
  77
  78 /* Implements the remote setpag(2) call. Note that unlike the standard call,
  79  * here we also get back the new pag value; we need this so that the caller
  80  * can add it to its group list via setgroups() */
  81 afs_int32
  82 SRMTSYS_SetPag(struct rx_call *call, clientcred *creds, afs_int32 *newpag,
  83                afs_int32 *errornumber)
  84 {
  85     afs_uint32 blob[PIOCTL_HEADER];
  86     struct ViceIoctl data;
  87     afs_int32 error;
  88
  89     *errornumber = 0;
  90     SETCLIENTCONTEXT(blob, rx_HostOf(rx_PeerOf(rx_ConnectionOf(call))), creds->uid,
  91                      creds->group0, creds->group1, PSETPAG, NFS_EXPORTER);
  92     data.in = (caddr_t) blob;
  93     data.in_size = sizeof(blob);
  94     data.out = (caddr_t) blob;
  95     data.out_size = sizeof(blob);
  96     /* force local pioctl call */
  97     error = lpioctl(0, _VICEIOCTL(PSetClientContext), &data, 1);
  98     if (error) {
  99         if (errno == PSETPAG) {
 100             *newpag = blob[0];  /* new pag value */
 101         } else
 102             *errornumber = errno;
 103     }
 104     return 0;
 105 }
 106
 107
 108 /* Implements the remote pioctl(2) call */
 109 afs_int32
 110 SRMTSYS_Pioctl(struct rx_call *call, clientcred *creds, char *path,
 111                afs_int32 cmd, afs_int32 follow, rmtbulk *InData,
 112                rmtbulk *OutData, afs_int32 *errornumber)
 113 {
 114     afs_int32 error;
 115     struct ViceIoctl data;
 116     char *pathp = path;
 117     afs_uint32 blob[PIOCTL_HEADER];
 118
 119     *errornumber = 0;
 120     SETCLIENTCONTEXT(blob, rx_HostOf(rx_PeerOf(rx_ConnectionOf(call))), creds->uid,
 121                      creds->group0, creds->group1, cmd, NFS_EXPORTER);
 122     data.in = malloc(InData->rmtbulk_len + PIOCTL_HEADER * sizeof(afs_int32));
 123     if (!data.in)
 124         return (-1);            /* helpless here */
 125     if (!strcmp(path, NIL_PATHP))
 126         pathp = (char *)0;      /* It meant to be NIL */
 127     memcpy(data.in, blob, sizeof(blob));
 128     inparam_conversion(cmd, InData->rmtbulk_val, 1);
 129     memcpy(data.in + sizeof(blob), InData->rmtbulk_val, InData->rmtbulk_len);
 130     data.in_size = InData->rmtbulk_len + PIOCTL_HEADER * sizeof(afs_int32);
 131     data.out = OutData->rmtbulk_val;
 132     data.out_size = OutData->rmtbulk_len;
 133     /* force local pioctl call */
 134     error = lpioctl(pathp, _VICEIOCTL(PSetClientContext), &data, follow);
 135     if (error) {
 136         *errornumber = errno;
 137     } else {
 138         /* Send the results back in network order */
 139         outparam_conversion(cmd, data.out, 0);
 140     }
 141     free(data.in);
 142     /* Note that we return success (i.e. 0) even when pioctl fails; that's
 143      * because the actual errno is passed back via 'errornumber' and this call
 144      * MUST return success error in order to get that OUT params back (YUCK!)
 145      */
 146     return (0);
 147 }
 148
 149 void
 150 rmt_Quit(char *msg, ...)
 151 {
 152     va_list ap;
 153
 154     va_start(ap, msg);
 155     vfprintf(stderr, msg, ap);
 156     va_end(ap);
 157     exit(1);
 158 }