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Diffstat (limited to 'procfs/main.c')
| -rw-r--r-- | procfs/main.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/procfs/main.c b/procfs/main.c new file mode 100644 index 00000000..54e96823 --- /dev/null +++ b/procfs/main.c @@ -0,0 +1,315 @@ +/* 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 */); +} + |