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Diffstat (limited to 'hostmux/hostmux.c')
| -rw-r--r-- | hostmux/hostmux.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/hostmux/hostmux.c b/hostmux/hostmux.c new file mode 100644 index 00000000..a69b7cf4 --- /dev/null +++ b/hostmux/hostmux.c @@ -0,0 +1,162 @@ +/* Multiplexing filesystems by host + + Copyright (C) 1997 Free Software Foundation, Inc. + Written by Miles Bader <miles@gnu.ai.mit.edu> + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include <unistd.h> +#include <argp.h> +#include <argz.h> +#include <error.h> +#include <sys/time.h> + +#include "hostmux.h" + +int netfs_maxsymlinks = 25; + +volatile struct mapped_time_value *hostmux_mapped_time; + +#define DEFAULT_HOST_PAT "${host}" + +/* Startup options. */ +static const struct argp_option options[] = +{ + { "host-pattern", 'H', "PAT", 0, + "The string to replace in the translator specification with the hostname;" + " if empty, or doesn't occur, the hostname is appended as additional" + " argument instead (default `" DEFAULT_HOST_PAT "')" }, + { 0 } +}; +static const char args_doc[] = "TRANSLATOR [ARG...]"; +static const char doc[] = + "A translator for invoking host-specific translators" + "\vThis translator appears like a directory in which hostnames can be" + " looked up, and will start TRANSLATOR to service each resulting node."; + +/* Return an argz string describing the current options. Fill *ARGZ + with a pointer to newly malloced storage holding the list and *LEN + to the length of that storage. */ +error_t +netfs_append_args (char **argz, size_t *argz_len) +{ + char buf[80]; + error_t err = 0; + struct hostmux *mux = netfs_root_node->nn->mux; + +#define FOPT(fmt, arg) \ + do { \ + if (! err) \ + { \ + snprintf (buf, sizeof buf, fmt, arg); \ + err = argz_add (argz, argz_len, buf); \ + } \ + } while (0) + + if (strcmp (mux->host_pat, DEFAULT_HOST_PAT) != 0) + FOPT ("--host-pattern=%s", mux->host_pat); + + if (! err) + err = argz_append (argz, argz_len, + mux->trans_template, mux->trans_template_len); + + return err; +} + +int +main (int argc, char **argv) +{ + error_t err; + struct stat ul_stat; + mach_port_t bootstrap; + struct hostmux mux = { host_pat: DEFAULT_HOST_PAT, next_fileno: 10 }; + struct netnode root_nn = { mux: &mux }; + + error_t parse_opt (int key, char *arg, struct argp_state *state) + { + switch (key) + { + case 'H': + mux.host_pat = arg; break; + case ARGP_KEY_NO_ARGS: + argp_usage (state); + case ARGP_KEY_ARGS: + /* Steal the entire tail of arg vector for our own use. */ + return argz_create (state->argv + state->next, + &mux.trans_template, &mux.trans_template_len); + default: + return ARGP_ERR_UNKNOWN; + } + return 0; + } + struct argp argp = { options, parse_opt, args_doc, doc }; + + /* Parse our command line arguments. */ + argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, 0); + + task_get_bootstrap_port (mach_task_self (), &bootstrap); + netfs_init (); + + /* Create the root node (some attributes initialized below). */ + netfs_root_node = netfs_make_node (&root_nn); + if (! netfs_root_node) + error (5, ENOMEM, "Cannot create root node"); + + err = maptime_map (0, 0, &hostmux_maptime); + if (err) + error (6, err, "Cannot map time"); + + /* Handshake with the party trying to start the translator. */ + mux.underlying = netfs_startup (bootstrap, 0); + + /* We inherit various attributes from the node underlying this translator. */ + err = io_stat (mux.underlying, &ul_stat); + if (err) + error (7, err, "Cannot stat underlying node"); + + /* MUX.stat_template contains some fields that are inherited by all nodes + we create. */ + mux.stat_template.st_uid = ul_stat.st_uid; + mux.stat_template.st_gid = ul_stat.st_gid; + mux.stat_template.st_author = ul_stat.st_author; + mux.stat_template.st_fsid = getpid (); + mux.stat_template.st_nlink = 1; + mux.stat_template.st_fstype = FSTYPE_MISC; + + /* Initialize the root node's stat information. */ + netfs_root_node->nn_stat = mux.stat_template; + netfs_root_node->nn_stat.st_ino = 2; + netfs_root_node->nn_stat.st_mode = + S_IFDIR | (ul_stat.st_mode & ~S_IFMT & ~S_ITRANS); + + /* If the underlying node isn't a directory, propagate read permission to + execute permission since we need that for lookups. */ + if (! S_ISDIR (ul_stat.st_mode)) + { + if (ul_stat.st_mode & S_IRUSR) + netfs_root_node->nn_stat.st_mode |= S_IXUSR; + if (ul_stat.st_mode & S_IRGRP) + netfs_root_node->nn_stat.st_mode |= S_IXGRP; + if (ul_stat.st_mode & S_IROTH) + netfs_root_node->nn_stat.st_mode |= S_IXOTH; + } + + fshelp_touch (&netfs_root_node->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME, + hostmux_maptime); + + for (;;) /* ?? */ + netfs_server_loop (); +} |