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-rw-r--r--procfs/main.c315
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diff --git a/procfs/main.c b/procfs/main.c
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+/* Hurd /proc filesystem, main program.
+ Copyright (C) 2010 Free Software Foundation, Inc.
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <mach.h>
+#include <hurd.h>
+#include <unistd.h>
+#include <error.h>
+#include <argp.h>
+#include <argz.h>
+#include <hurd/netfs.h>
+#include <ps.h>
+#include "procfs.h"
+#include "proclist.h"
+#include "rootdir.h"
+#include "dircat.h"
+#include "main.h"
+
+/* Command-line options */
+int opt_clk_tck;
+mode_t opt_stat_mode;
+pid_t opt_fake_self;
+pid_t opt_kernel_pid;
+uid_t opt_anon_owner;
+
+/* Default values */
+#define OPT_CLK_TCK sysconf(_SC_CLK_TCK)
+#define OPT_STAT_MODE 0400
+#define OPT_FAKE_SELF -1
+#define OPT_KERNEL_PID 2
+#define OPT_ANON_OWNER 0
+
+#define NODEV_KEY -1 /* <= 0, so no short option. */
+#define NOEXEC_KEY -2 /* Likewise. */
+#define NOSUID_KEY -3 /* Likewise. */
+
+static error_t
+argp_parser (int key, char *arg, struct argp_state *state)
+{
+ struct passwd *pw;
+ char *endp;
+ long int v;
+
+ switch (key)
+ {
+ case 'h':
+ v = strtol (arg, &endp, 0);
+ if (*endp || ! *arg || v <= 0)
+ argp_error (state, "--clk-tck: HZ should be a positive integer");
+ else
+ opt_clk_tck = v;
+ break;
+
+ case 's':
+ v = strtol (arg, &endp, 8);
+ if (*endp || ! *arg || (mode_t) v & ~07777)
+ argp_error (state, "--stat-mode: MODE should be an octal mode");
+ else
+ opt_stat_mode = v;
+ break;
+
+ case 'S':
+ if (arg)
+ {
+ v = strtol (arg, &endp, 0);
+ if (*endp || ! *arg)
+ argp_error (state, "--fake-self: PID must be an integer");
+ else
+ opt_fake_self = v;
+ }
+ else
+ opt_fake_self = 1;
+ break;
+
+ case 'k':
+ v = strtol (arg, &endp, 0);
+ if (*endp || ! *arg || (signed) opt_kernel_pid < 0)
+ argp_error (state, "--kernel-process: PID must be a positive integer");
+ else
+ opt_kernel_pid = v;
+ break;
+
+ case 'c':
+ opt_clk_tck = 100;
+ opt_stat_mode = 0444;
+ opt_fake_self = 1;
+ break;
+
+ case 'a':
+ pw = getpwnam (arg);
+ if (pw)
+ {
+ opt_anon_owner = pw->pw_uid;
+ break;
+ }
+
+ v = strtol (arg, &endp, 0);
+ if (*endp || ! *arg || v < 0)
+ argp_error (state, "--anonymous-owner: USER should be "
+ "a user name or a numeric UID.");
+ else
+ opt_anon_owner = v;
+ break;
+
+ case NODEV_KEY:
+ /* Ignored for compatibility with Linux' procfs. */
+ ;;
+
+ case NOEXEC_KEY:
+ /* Ignored for compatibility with Linux' procfs. */
+ ;;
+
+ case NOSUID_KEY:
+ /* Ignored for compatibility with Linux' procfs. */
+ ;;
+
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+struct argp_option common_options[] = {
+ { "clk-tck", 'h', "HZ", 0,
+ "Unit used for the values expressed in system clock ticks "
+ "(default: sysconf(_SC_CLK_TCK))" },
+ { "stat-mode", 's', "MODE", 0,
+ "The [pid]/stat file publishes information which on Hurd is only "
+ "available to the process owner. "
+ "You can use this option to override its mode to be more permissive "
+ "for compatibility purposes. "
+ "(default: 0400)" },
+ { "fake-self", 'S', "PID", OPTION_ARG_OPTIONAL,
+ "Provide a fake \"self\" symlink to the given PID, for compatibility "
+ "purposes. If PID is omitted, \"self\" will point to init. "
+ "(default: no self link)" },
+ { "kernel-process", 'k', "PID", 0,
+ "Process identifier for the kernel, used to retreive its command "
+ "line, as well as the global up and idle times. "
+ "(default: 2)" },
+ { "compatible", 'c', NULL, 0,
+ "Try to be compatible with the Linux procps utilities. "
+ "Currently equivalent to -h 100 -s 0444 -S 1." },
+ { "anonymous-owner", 'a', "USER", 0,
+ "Make USER the owner of files related to processes without one. "
+ "Be aware that USER will be granted access to the environment and "
+ "other sensitive information about the processes in question. "
+ "(default: use uid 0)" },
+ { "nodev", NODEV_KEY, NULL, 0,
+ "Ignored for compatibility with Linux' procfs." },
+ { "noexec", NOEXEC_KEY, NULL, 0,
+ "Ignored for compatibility with Linux' procfs." },
+ { "nosuid", NOSUID_KEY, NULL, 0,
+ "Ignored for compatibility with Linux' procfs." },
+ {}
+};
+
+struct argp argp = {
+ .options = common_options,
+ .parser = argp_parser,
+ .doc = "A virtual filesystem emulating the Linux procfs.",
+ .children = (struct argp_child []) {
+ { &netfs_std_startup_argp, },
+ {}
+ },
+};
+
+static error_t
+runtime_argp_parser (int key, char *arg, struct argp_state *state)
+{
+ switch (key)
+ {
+ case 'u':
+ /* do nothing */
+ break;
+
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+struct argp runtime_argp = {
+ .options = (struct argp_option []) {
+ { "update", 'u', NULL, 0, "remount; for procfs this does nothing" },
+ {},
+ },
+ .parser = runtime_argp_parser,
+};
+
+struct argp netfs_runtime_argp_ = {
+ .options = common_options,
+ .parser = argp_parser,
+ .doc = "A virtual filesystem emulating the Linux procfs.",
+ .children = (struct argp_child []) {
+ { &runtime_argp, },
+ { &netfs_std_runtime_argp, },
+ {}
+ },
+};
+
+/* Used by netfs_set_options to handle runtime option parsing. */
+struct argp *netfs_runtime_argp = &argp;
+
+/* 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;
+
+#define FOPT(opt, default, fmt, args...) \
+ do { \
+ if (! err && opt != default) \
+ { \
+ snprintf (buf, sizeof buf, fmt, ## args); \
+ err = argz_add (argz, argz_len, buf); \
+ } \
+ } while (0)
+
+ FOPT (opt_clk_tck, OPT_CLK_TCK,
+ "--clk-tck=%d", opt_clk_tck);
+
+ FOPT (opt_stat_mode, OPT_STAT_MODE,
+ "--stat-mode=%o", opt_stat_mode);
+
+ FOPT (opt_fake_self, OPT_FAKE_SELF,
+ "--fake-self=%d", opt_fake_self);
+
+ FOPT (opt_anon_owner, OPT_ANON_OWNER,
+ "--anonymous-owner=%d", opt_anon_owner);
+
+ FOPT (opt_kernel_pid, OPT_KERNEL_PID,
+ "--kernel-process=%d", opt_kernel_pid);
+
+#undef FOPT
+
+ if (! err)
+ err = netfs_append_std_options (argz, argz_len);
+
+ return err;
+}
+
+error_t
+root_make_node (struct ps_context *pc, struct node **np)
+{
+ struct node *root_dirs[] = {
+ proclist_make_node (pc),
+ rootdir_make_node (pc),
+ };
+
+ *np = dircat_make_node (root_dirs, sizeof root_dirs / sizeof root_dirs[0]);
+ if (! *np)
+ return ENOMEM;
+
+ /* Since this one is not created through proc_lookup(), we have to affect an
+ inode number to it. */
+ (*np)->nn_stat.st_ino = * (uint32_t *) "PROC";
+
+ return 0;
+}
+
+int main (int argc, char **argv)
+{
+ struct ps_context *pc;
+ mach_port_t bootstrap;
+ error_t err;
+
+ opt_clk_tck = OPT_CLK_TCK;
+ opt_stat_mode = OPT_STAT_MODE;
+ opt_fake_self = OPT_FAKE_SELF;
+ opt_kernel_pid = OPT_KERNEL_PID;
+ opt_anon_owner = OPT_ANON_OWNER;
+ err = argp_parse (&argp, argc, argv, 0, 0, 0);
+ if (err)
+ error (1, err, "Could not parse command line");
+
+ err = ps_context_create (getproc (), &pc);
+ if (err)
+ error (1, err, "Could not create libps context");
+
+ task_get_bootstrap_port (mach_task_self (), &bootstrap);
+ if (bootstrap == MACH_PORT_NULL)
+ error (1, 0, "Must be started as a translator");
+
+ netfs_init ();
+ err = root_make_node (pc, &netfs_root_node);
+ if (err)
+ error (1, err, "Could not create the root node");
+
+ netfs_startup (bootstrap, 0);
+ netfs_server_loop ();
+
+ assert (0 /* netfs_server_loop returned after all */);
+}
+
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