contrib/cvs-1.12/src/rsh-client.c

   1 /* CVS rsh client stuff.
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; either version 2, or (at your option)
   6    any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.  */
  12
  13 #include <config.h>
  14
  15 #include "cvs.h"
  16 #include "buffer.h"
  17
  18 #ifdef CLIENT_SUPPORT
  19
  20 #include "rsh-client.h"
  21
  22 #ifndef NO_EXT_METHOD
  23
  24 /* Contact the server by starting it with rsh.  */
  25
  26 /* Right now, we have two different definitions for this function,
  27    depending on whether we start the rsh server using popenRW or not.
  28    This isn't ideal, and the best thing would probably be to change
  29    the OS/2 port to be more like the regular Unix client (i.e., by
  30    implementing piped_child)... but I'm doing something else at the
  31    moment, and wish to make only one change at a time.  -Karl */
  32
  33 # ifdef START_RSH_WITH_POPEN_RW
  34
  35
  36
  37 /* This is actually a crock -- it's OS/2-specific, for no one else
  38    uses it.  If I get time, I want to make piped_child and all the
  39    other stuff in os2/run.c work right.  In the meantime, this gets us
  40    up and running, and that's most important. */
  41 void
  42 start_rsh_server (cvsroot_t *root, struct buffer **to_server_p,
  43                   struct buffer **from_server_p)
  44 {
  45     int pipes[2];
  46     int child_pid;
  47
  48     /* If you're working through firewalls, you can set the
  49        CVS_RSH environment variable to a script which uses rsh to
  50        invoke another rsh on a proxy machine.  */
  51     char *cvs_rsh = (root->cvs_rsh != NULL
  52                      ? root->cvs_rsh : getenv ("CVS_RSH"));
  53     char *cvs_server = (root->cvs_server != NULL
  54                         ? root->cvs_server : getenv ("CVS_SERVER"));
  55     int i = 0;
  56     /* This needs to fit "rsh", "-b", "-l", "USER", "host",
  57        "cmd (w/ args)", and NULL.  We leave some room to grow. */
  58     char *rsh_argv[10];
  59
  60     if (!cvs_rsh)
  61         /* People sometimes suggest or assume that this should default
  62            to "remsh" on systems like HPUX in which that is the
  63            system-supplied name for the rsh program.  However, that
  64            causes various problems (keep in mind that systems such as
  65            HPUX might have non-system-supplied versions of "rsh", like
  66            a Kerberized one, which one might want to use).  If we
  67            based the name on what is found in the PATH of the person
  68            who runs configure, that would make it harder to
  69            consistently produce the same result in the face of
  70            different people producing binary distributions.  If we
  71            based it on "remsh" always being the default for HPUX
  72            (e.g. based on uname), that might be slightly better but
  73            would require us to keep track of what the defaults are for
  74            each system type, and probably would cope poorly if the
  75            existence of remsh or rsh varies from OS version to OS
  76            version.  Therefore, it seems best to have the default
  77            remain "rsh", and tell HPUX users to specify remsh, for
  78            example in CVS_RSH or other such mechanisms to be devised,
  79            if that is what they want (the manual already tells them
  80            that).  */
  81         cvs_rsh = RSH_DFLT;
  82     if (!cvs_server)
  83         cvs_server = "cvs";
  84
  85     /* The command line starts out with rsh. */
  86     rsh_argv[i++] = cvs_rsh;
  87
  88 #   ifdef RSH_NEEDS_BINARY_FLAG
  89     /* "-b" for binary, under OS/2. */
  90     rsh_argv[i++] = "-b";
  91 #   endif /* RSH_NEEDS_BINARY_FLAG */
  92
  93     /* Then we strcat more things on the end one by one. */
  94     if (root->username != NULL)
  95     {
  96         rsh_argv[i++] = "-l";
  97         rsh_argv[i++] = root->username;
  98     }
  99
 100     rsh_argv[i++] = root->hostname;
 101     rsh_argv[i++] = cvs_server;
 102     rsh_argv[i++] = "server";
 103
 104     /* Mark the end of the arg list. */
 105     rsh_argv[i]   = NULL;
 106
 107     if (trace)
 108     {
 109         fprintf (stderr, " -> Starting server: ");
 110         for (i = 0; rsh_argv[i]; i++)
 111             fprintf (stderr, "%s ", rsh_argv[i]);
 112         putc ('\n', stderr);
 113     }
 114
 115     /* Do the deed. */
 116     child_pid = popenRW (rsh_argv, pipes);
 117     if (child_pid < 0)
 118         error (1, errno, "cannot start server via rsh");
 119
 120     /* Give caller the file descriptors in a form it can deal with. */
 121     make_bufs_from_fds (pipes[0], pipes[1], child_pid, to_server_p,
 122                         from_server_p, 0);
 123 }
 124
 125 # else /* ! START_RSH_WITH_POPEN_RW */
 126
 127 void
 128 start_rsh_server (cvsroot_t *root, struct buffer **to_server_p,
 129                   struct buffer **from_server_p)
 130 {
 131     /* If you're working through firewalls, you can set the
 132        CVS_RSH environment variable to a script which uses rsh to
 133        invoke another rsh on a proxy machine.  */
 134     char *cvs_rsh = (root->cvs_rsh != NULL
 135                      ? root->cvs_rsh : getenv ("CVS_RSH"));
 136     char *cvs_server = (root->cvs_server != NULL
 137                         ? root->cvs_server : getenv ("CVS_SERVER"));
 138     char *command;
 139     int tofd, fromfd;
 140     int child_pid;
 141
 142     if (!cvs_rsh)
 143         cvs_rsh = RSH_DFLT;
 144     if (!cvs_server)
 145         cvs_server = "cvs";
 146
 147     /* Pass the command to rsh as a single string.  This shouldn't
 148      * affect most rsh servers at all, and will pacify some buggy
 149      * versions of rsh that grab switches out of the middle of the
 150      * command (they're calling the GNU getopt routines incorrectly).
 151      *
 152      * If you are running a very old (Nov 3, 1994, before 1.5)
 153      * version of the server, you need to make sure that your .bashrc
 154      * on the server machine does not set CVSROOT to something
 155      * containing a colon (or better yet, upgrade the server).
 156      */
 157     command = Xasprintf ("%s server", cvs_server);
 158
 159     {
 160         char *argv[10];
 161         char **p = argv;
 162
 163         *p++ = cvs_rsh;
 164
 165         /* If the login names differ between client and server
 166          * pass it on to rsh.
 167          */
 168         if (root->username != NULL)
 169         {
 170             *p++ = "-l";
 171             *p++ = root->username;
 172         }
 173
 174         *p++ = root->hostname;
 175         *p++ = command;
 176         *p++ = NULL;
 177
 178         if (trace)
 179         {
 180             int i;
 181
 182             fprintf (stderr, " -> Starting server: ");
 183             for (i = 0; argv[i]; i++)
 184                 fprintf (stderr, "%s ", argv[i]);
 185             putc ('\n', stderr);
 186         }
 187         child_pid = piped_child (argv, &tofd, &fromfd, true);
 188
 189         if (child_pid < 0)
 190             error (1, errno, "cannot start server via rsh");
 191     }
 192     free (command);
 193
 194     make_bufs_from_fds (tofd, fromfd, child_pid, root, to_server_p,
 195                         from_server_p, 0);
 196 }
 197
 198 # endif /* START_RSH_WITH_POPEN_RW */
 199
 200 #endif /* NO_EXT_METHOD */
 201
 202 #endif /* CLIENT_SUPPORT */