source: mainline/uspace/srv/loader/main.c@ 5d96851b

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 5d96851b was 5d96851b, checked in by Jiri Svoboda <jirik.svoboda@…>, 16 years ago

Pass task ID to NS from loader. This prevents ID spoofing by user apps.
  • Property mode set to 100644
File size: 9.7 KB
Line 
1/*
2 * Copyright (c) 2008 Jiri Svoboda
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup loader
30 * @brief Loads and runs programs from VFS.
31 * @{
32 */
33/**
34 * @file
35 * @brief Loads and runs programs from VFS.
36 *
37 * The program loader is a special init binary. Its image is used
38 * to create a new task upon a @c task_spawn syscall. The syscall
39 * returns the id of a phone connected to the newly created task.
40 *
41 * The caller uses this phone to send the pathname and various other
42 * information to the loader. This is normally done by the C library
43 * and completely hidden from applications.
44 */
45
46#include <stdio.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <bool.h>
50#include <fcntl.h>
51#include <sys/types.h>
52#include <ipc/ipc.h>
53#include <ipc/services.h>
54#include <ipc/loader.h>
55#include <ipc/ns.h>
56#include <macros.h>
57#include <loader/pcb.h>
58#include <errno.h>
59#include <async.h>
60#include <string.h>
61#include <as.h>
62
63#include <elf.h>
64#include <elf_load.h>
65
66#define DPRINTF(...)
67
68/** Pathname of the file that will be loaded */
69static char *pathname = NULL;
70
71/** The Program control block */
72static pcb_t pcb;
73
74/** Number of arguments */
75static int argc = 0;
76/** Argument vector */
77static char **argv = NULL;
78/** Buffer holding all arguments */
79static char *arg_buf = NULL;
80
81/** Number of preset files */
82static int filc = 0;
83/** Preset files vector */
84static fdi_node_t **filv = NULL;
85/** Buffer holding all preset files */
86static fdi_node_t *fil_buf = NULL;
87
88static elf_info_t prog_info;
89static elf_info_t interp_info;
90
91static bool is_dyn_linked;
92
93/** Used to limit number of connections to one. */
94static bool connected;
95
96static void ldr_get_taskid(ipc_callid_t rid, ipc_call_t *request)
97{
98 ipc_callid_t callid;
99 task_id_t task_id;
100 size_t len;
101
102 task_id = task_get_id();
103
104 if (!ipc_data_read_receive(&callid, &len)) {
105 ipc_answer_0(callid, EINVAL);
106 ipc_answer_0(rid, EINVAL);
107 return;
108 }
109
110 if (len > sizeof(task_id))
111 len = sizeof(task_id);
112
113 ipc_data_read_finalize(callid, &task_id, len);
114 ipc_answer_0(rid, EOK);
115}
116
117
118/** Receive a call setting pathname of the program to execute.
119 *
120 * @param rid
121 * @param request
122 */
123static void ldr_set_pathname(ipc_callid_t rid, ipc_call_t *request)
124{
125 ipc_callid_t callid;
126 size_t len;
127 char *name_buf;
128
129 if (!ipc_data_write_receive(&callid, &len)) {
130 ipc_answer_0(callid, EINVAL);
131 ipc_answer_0(rid, EINVAL);
132 return;
133 }
134
135 name_buf = malloc(len + 1);
136 if (!name_buf) {
137 ipc_answer_0(callid, ENOMEM);
138 ipc_answer_0(rid, ENOMEM);
139 return;
140 }
141
142 ipc_data_write_finalize(callid, name_buf, len);
143 ipc_answer_0(rid, EOK);
144
145 if (pathname != NULL) {
146 free(pathname);
147 pathname = NULL;
148 }
149
150 name_buf[len] = '\0';
151 pathname = name_buf;
152}
153
154/** Receive a call setting arguments of the program to execute.
155 *
156 * @param rid
157 * @param request
158 */
159static void ldr_set_args(ipc_callid_t rid, ipc_call_t *request)
160{
161 ipc_callid_t callid;
162 size_t buf_size, arg_size;
163 char *p;
164 int n;
165
166 if (!ipc_data_write_receive(&callid, &buf_size)) {
167 ipc_answer_0(callid, EINVAL);
168 ipc_answer_0(rid, EINVAL);
169 return;
170 }
171
172 if (arg_buf != NULL) {
173 free(arg_buf);
174 arg_buf = NULL;
175 }
176
177 if (argv != NULL) {
178 free(argv);
179 argv = NULL;
180 }
181
182 arg_buf = malloc(buf_size + 1);
183 if (!arg_buf) {
184 ipc_answer_0(callid, ENOMEM);
185 ipc_answer_0(rid, ENOMEM);
186 return;
187 }
188
189 ipc_data_write_finalize(callid, arg_buf, buf_size);
190
191 arg_buf[buf_size] = '\0';
192
193 /*
194 * Count number of arguments
195 */
196 p = arg_buf;
197 n = 0;
198 while (p < arg_buf + buf_size) {
199 arg_size = str_size(p);
200 p = p + arg_size + 1;
201 ++n;
202 }
203
204 /* Allocate argv */
205 argv = malloc((n + 1) * sizeof(char *));
206
207 if (argv == NULL) {
208 free(arg_buf);
209 ipc_answer_0(rid, ENOMEM);
210 return;
211 }
212
213 /*
214 * Fill argv with argument pointers
215 */
216 p = arg_buf;
217 n = 0;
218 while (p < arg_buf + buf_size) {
219 argv[n] = p;
220
221 arg_size = str_size(p);
222 p = p + arg_size + 1;
223 ++n;
224 }
225
226 argc = n;
227 argv[n] = NULL;
228
229 ipc_answer_0(rid, EOK);
230}
231
232/** Receive a call setting preset files of the program to execute.
233 *
234 * @param rid
235 * @param request
236 */
237static void ldr_set_files(ipc_callid_t rid, ipc_call_t *request)
238{
239 ipc_callid_t callid;
240 size_t buf_size;
241 if (!ipc_data_write_receive(&callid, &buf_size)) {
242 ipc_answer_0(callid, EINVAL);
243 ipc_answer_0(rid, EINVAL);
244 return;
245 }
246
247 if ((buf_size % sizeof(fdi_node_t)) != 0) {
248 ipc_answer_0(callid, EINVAL);
249 ipc_answer_0(rid, EINVAL);
250 return;
251 }
252
253 if (fil_buf != NULL) {
254 free(fil_buf);
255 fil_buf = NULL;
256 }
257
258 if (filv != NULL) {
259 free(filv);
260 filv = NULL;
261 }
262
263 fil_buf = malloc(buf_size);
264 if (!fil_buf) {
265 ipc_answer_0(callid, ENOMEM);
266 ipc_answer_0(rid, ENOMEM);
267 return;
268 }
269
270 ipc_data_write_finalize(callid, fil_buf, buf_size);
271
272 int count = buf_size / sizeof(fdi_node_t);
273
274 /* Allocate filvv */
275 filv = malloc((count + 1) * sizeof(fdi_node_t *));
276
277 if (filv == NULL) {
278 free(fil_buf);
279 ipc_answer_0(rid, ENOMEM);
280 return;
281 }
282
283 /*
284 * Fill filv with argument pointers
285 */
286 int i;
287 for (i = 0; i < count; i++)
288 filv[i] = &fil_buf[i];
289
290 filc = count;
291 filv[count] = NULL;
292
293 ipc_answer_0(rid, EOK);
294}
295
296/** Load the previously selected program.
297 *
298 * @param rid
299 * @param request
300 * @return 0 on success, !0 on error.
301 */
302static int ldr_load(ipc_callid_t rid, ipc_call_t *request)
303{
304 int rc;
305
306 rc = elf_load_file(pathname, 0, &prog_info);
307 if (rc != EE_OK) {
308 DPRINTF("Failed to load executable '%s'.\n", pathname);
309 ipc_answer_0(rid, EINVAL);
310 return 1;
311 }
312
313 elf_create_pcb(&prog_info, &pcb);
314
315 pcb.argc = argc;
316 pcb.argv = argv;
317
318 pcb.filc = filc;
319 pcb.filv = filv;
320
321 if (prog_info.interp == NULL) {
322 /* Statically linked program */
323 is_dyn_linked = false;
324 ipc_answer_0(rid, EOK);
325 return 0;
326 }
327
328 rc = elf_load_file(prog_info.interp, 0, &interp_info);
329 if (rc != EE_OK) {
330 DPRINTF("Failed to load interpreter '%s.'\n",
331 prog_info.interp);
332 ipc_answer_0(rid, EINVAL);
333 return 1;
334 }
335
336 is_dyn_linked = true;
337 ipc_answer_0(rid, EOK);
338
339 return 0;
340}
341
342
343/** Run the previously loaded program.
344 *
345 * @param rid
346 * @param request
347 * @return 0 on success, !0 on error.
348 */
349static void ldr_run(ipc_callid_t rid, ipc_call_t *request)
350{
351 const char *cp;
352
353 /* Set the task name. */
354 cp = str_rchr(pathname, '/');
355 cp = (cp == NULL) ? pathname : (cp + 1);
356 task_set_name(cp);
357
358 if (is_dyn_linked == true) {
359 /* Dynamically linked program */
360 DPRINTF("Run ELF interpreter.\n");
361 DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
362
363 ipc_answer_0(rid, EOK);
364 elf_run(&interp_info, &pcb);
365 } else {
366 /* Statically linked program */
367 ipc_answer_0(rid, EOK);
368 elf_run(&prog_info, &pcb);
369 }
370
371 /* Not reached */
372}
373
374/** Handle loader connection.
375 *
376 * Receive and carry out commands (of which the last one should be
377 * to execute the loaded program).
378 */
379static void ldr_connection(ipc_callid_t iid, ipc_call_t *icall)
380{
381 ipc_callid_t callid;
382 ipc_call_t call;
383 int retval;
384
385 /* Already have a connection? */
386 if (connected) {
387 ipc_answer_0(iid, ELIMIT);
388 return;
389 }
390
391 connected = true;
392
393 /* Accept the connection */
394 ipc_answer_0(iid, EOK);
395
396 /* Ignore parameters, the connection is already open */
397 (void) iid;
398 (void) icall;
399
400 while (1) {
401 callid = async_get_call(&call);
402
403 switch (IPC_GET_METHOD(call)) {
404 case IPC_M_PHONE_HUNGUP:
405 exit(0);
406 case LOADER_GET_TASKID:
407 ldr_get_taskid(callid, &call);
408 continue;
409 case LOADER_SET_PATHNAME:
410 ldr_set_pathname(callid, &call);
411 continue;
412 case LOADER_SET_ARGS:
413 ldr_set_args(callid, &call);
414 continue;
415 case LOADER_SET_FILES:
416 ldr_set_files(callid, &call);
417 continue;
418 case LOADER_LOAD:
419 ldr_load(callid, &call);
420 continue;
421 case LOADER_RUN:
422 ldr_run(callid, &call);
423 /* Not reached */
424 default:
425 retval = ENOENT;
426 break;
427 }
428 if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
429 IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
430 DPRINTF("Responding EINVAL to method %d.\n",
431 IPC_GET_METHOD(call));
432 ipc_answer_0(callid, EINVAL);
433 }
434 }
435}
436
437/** Program loader main function.
438 */
439int main(int argc, char *argv[])
440{
441 ipcarg_t phonead;
442 task_id_t id;
443 int rc;
444
445 connected = false;
446
447 /* Introduce this task to the NS (give it our task ID). */
448 id = task_get_id();
449 rc = async_req_2_0(PHONE_NS, NS_ID_INTRO, LOWER32(id), UPPER32(id));
450 if (rc != EOK)
451 return -1;
452
453 /* Set a handler of incomming connections. */
454 async_set_client_connection(ldr_connection);
455
456 /* Register at naming service. */
457 if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
458 return -2;
459
460 async_manager();
461
462 /* Never reached */
463 return 0;
464}
465
466/** @}
467 */
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