Copyright 2010 Lennart Poettering
Copyright 2013 Daniel Mack
Copyright 2014 Kay Sievers
+ Copyright 2015 David Herrmann
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
#include <sys/poll.h>
#include <stddef.h>
#include <getopt.h>
+#include <pthread.h>
#include "log.h"
#include "util.h"
+#include "hashmap.h"
#include "socket-util.h"
#include "sd-daemon.h"
#include "sd-bus.h"
#include "synthesize.h"
static char *arg_address = NULL;
-static char *arg_command_line_buffer = NULL;
-static bool arg_drop_privileges = false;
static char **arg_configuration = NULL;
+typedef struct {
+ int fd;
+} ClientContext;
+
+static ClientContext *client_context_free(ClientContext *c) {
+ if (!c)
+ return NULL;
+
+ close(c->fd);
+ free(c);
+
+ return NULL;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(ClientContext*, client_context_free);
+
+static int client_context_new(ClientContext **out, int fd) {
+ _cleanup_(client_context_freep) ClientContext *c = NULL;
+
+ c = new0(ClientContext, 1);
+ if (!c)
+ return log_oom();
+
+ c->fd = fd;
+
+ *out = c;
+ c = NULL;
+ return 0;
+}
+
+static void *run_client(void *userdata) {
+ _cleanup_(client_context_freep) ClientContext *c = userdata;
+ _cleanup_(proxy_freep) Proxy *p = NULL;
+ int r;
+
+ r = proxy_new(&p, c->fd, c->fd, arg_address);
+ if (r < 0)
+ goto exit;
+
+ r = proxy_load_policy(p, arg_configuration);
+ if (r < 0)
+ goto exit;
+
+ r = proxy_hello_policy(p, getuid());
+ if (r < 0)
+ goto exit;
+
+ r = proxy_run(p);
+
+exit:
+ return NULL;
+}
+
+static int loop_clients(int accept_fd) {
+ pthread_attr_t attr;
+ int r;
+
+ r = pthread_attr_init(&attr);
+ if (r < 0) {
+ r = log_error_errno(errno, "Cannot initialize pthread attributes: %m");
+ goto exit;
+ }
+
+ r = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ if (r < 0) {
+ r = log_error_errno(errno, "Cannot mark pthread attributes as detached: %m");
+ goto exit_attr;
+ }
+
+ for (;;) {
+ ClientContext *c;
+ pthread_t tid;
+ int fd;
+
+ fd = accept4(accept_fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
+ if (fd < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+
+ r = log_error_errno(errno, "accept4() failed: %m");
+ break;
+ }
+
+ r = client_context_new(&c, fd);
+ if (r < 0) {
+ log_oom();
+ close(fd);
+ continue;
+ }
+
+ r = pthread_create(&tid, &attr, run_client, c);
+ if (r < 0) {
+ log_error("Cannot spawn thread: %m");
+ client_context_free(c);
+ continue;
+ }
+ }
+
+exit_attr:
+ pthread_attr_destroy(&attr);
+exit:
+ return r;
+}
+
static int help(void) {
printf("%s [OPTIONS...]\n\n"
- "Connect STDIO or a socket to a given bus address.\n\n"
+ "DBus proxy server.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
- " --drop-privileges Drop privileges\n"
" --configuration=PATH Configuration file or directory\n"
" --machine=MACHINE Connect to specified machine\n"
" --address=ADDRESS Connect to the bus specified by ADDRESS\n"
enum {
ARG_VERSION = 0x100,
ARG_ADDRESS,
- ARG_DROP_PRIVILEGES,
ARG_CONFIGURATION,
ARG_MACHINE,
};
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "address", required_argument, NULL, ARG_ADDRESS },
- { "drop-privileges", no_argument, NULL, ARG_DROP_PRIVILEGES },
{ "configuration", required_argument, NULL, ARG_CONFIGURATION },
{ "machine", required_argument, NULL, ARG_MACHINE },
{},
break;
}
- case ARG_DROP_PRIVILEGES:
- arg_drop_privileges = true;
- break;
-
case ARG_CONFIGURATION:
r = strv_extend(&arg_configuration, optarg);
if (r < 0)
assert_not_reached("Unhandled option");
}
- /* If the first command line argument is only "x" characters
- * we'll write who we are talking to into it, so that "ps" is
- * explanatory */
- arg_command_line_buffer = argv[optind];
- if (argc > optind + 1 || (arg_command_line_buffer && !in_charset(arg_command_line_buffer, "x"))) {
+ if (argc > optind) {
log_error("Too many arguments");
return -EINVAL;
}
return 1;
}
-static int rename_service(sd_bus *a, sd_bus *b) {
- _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
- _cleanup_free_ char *p = NULL, *name = NULL;
- const char *comm;
- char **cmdline;
- uid_t uid;
- pid_t pid;
- int r;
-
- assert(a);
- assert(b);
-
- r = sd_bus_get_owner_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM|SD_BUS_CREDS_AUGMENT, &creds);
- if (r < 0)
- return r;
-
- r = sd_bus_creds_get_uid(creds, &uid);
- if (r < 0)
- return r;
-
- r = sd_bus_creds_get_pid(creds, &pid);
- if (r < 0)
- return r;
-
- r = sd_bus_creds_get_cmdline(creds, &cmdline);
- if (r < 0)
- return r;
-
- r = sd_bus_creds_get_comm(creds, &comm);
- if (r < 0)
- return r;
-
- name = uid_to_name(uid);
- if (!name)
- return -ENOMEM;
-
- p = strv_join(cmdline, " ");
- if (!p)
- return -ENOMEM;
-
- /* The status string gets the full command line ... */
- sd_notifyf(false,
- "STATUS=Processing requests from client PID "PID_FMT" (%s); UID "UID_FMT" (%s)",
- pid, p,
- uid, name);
-
- /* ... and the argv line only the short comm */
- if (arg_command_line_buffer) {
- size_t m, w;
-
- m = strlen(arg_command_line_buffer);
- w = snprintf(arg_command_line_buffer, m,
- "[PID "PID_FMT"/%s; UID "UID_FMT"/%s]",
- pid, comm,
- uid, name);
-
- if (m > w)
- memzero(arg_command_line_buffer + w, m - w);
- }
-
- log_debug("Running on behalf of PID "PID_FMT" (%s), UID "UID_FMT" (%s), %s",
- pid, p,
- uid, name,
- a->unique_name);
-
- return 0;
-}
-
int main(int argc, char *argv[]) {
- _cleanup_(proxy_freep) Proxy *p = NULL;
- int r, in_fd, out_fd;
- uid_t original_uid;
+ int r, accept_fd;
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_parse_environment();
goto finish;
r = sd_listen_fds(0);
- if (r == 0) {
- in_fd = STDIN_FILENO;
- out_fd = STDOUT_FILENO;
- } else if (r == 1) {
- in_fd = SD_LISTEN_FDS_START;
- out_fd = SD_LISTEN_FDS_START;
- } else {
+ if (r != 1) {
log_error("Illegal number of file descriptors passed");
goto finish;
}
- original_uid = getuid();
-
- if (arg_drop_privileges) {
- const char *user = "systemd-bus-proxy";
- uid_t uid;
- gid_t gid;
-
- r = get_user_creds(&user, &uid, &gid, NULL, NULL);
- if (r < 0) {
- log_error_errno(r, "Cannot resolve user name %s: %m", user);
- goto finish;
- }
-
- r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
- if (r < 0)
- goto finish;
- }
-
- r = proxy_new(&p, in_fd, out_fd, arg_address);
- if (r < 0)
+ accept_fd = SD_LISTEN_FDS_START;
+ r = fd_nonblock(accept_fd, false);
+ if (r < 0) {
+ log_error_errno(r, "Cannot mark accept-fd non-blocking: %m");
goto finish;
+ }
- r = proxy_load_policy(p, arg_configuration);
- if (r < 0)
- goto finish;
-
- r = proxy_hello_policy(p, original_uid);
- if (r < 0)
- goto finish;
-
- r = rename_service(p->dest_bus, p->local_bus);
- if (r < 0)
- log_debug_errno(r, "Failed to rename process: %m");
-
- r = proxy_run(p);
+ r = loop_clients(accept_fd);
finish:
sd_notify(false,
~ianmdlvl / elogind.git / blobdiff