1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
|
#include "confmodule.h"
#include "commands.h"
#include "frontend.h"
#include "database.h"
#include "question.h"
#include "template.h"
#include "strutl.h"
#include "debconfclient.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <debian-installer.h>
static commands_t commands[] = {
#include "commands-list.h"
{ 0, 0 }
};
volatile sig_atomic_t signal_received = 0;
volatile sig_atomic_t sigchld_status = 0;
/* private functions */
/*
* @brief helper function to process incoming commands
* @param struct confmodule *mod - confmodule object
* @param char *in - input command
* @param char *out - reply buffer
* @param size_t outsize - reply buffer length
* @return int - DC_OK, DC_NOTOK, DC_NOTIMPL
*/
static char *_confmodule_process(struct confmodule *mod, char *in)
{
int i;
char *retval = NULL;
char *argv[2] = { "", "" };
char *inp = strstrip(in);
INFO(INFO_DEBUG, "--> %s", inp);
if (*inp == '#') return NULL;
if (mod->frontend->capability & DCF_CAPB_ESCAPE)
strunescape(inp, inp, strlen(inp)+1, STRESCAPE_CAPB);
strcmdsplit(inp, argv, DIM(argv));
for (i = 0; commands[i].command != 0; i++)
{
if (strcasecmp(argv[0], commands[i].command) == 0) {
retval = (*commands[i].handler)(mod, argv[1]);
break;
}
}
if (retval == NULL)
fprintf(stderr, "E: Unimplemented function\n");
return retval;
}
/*
* @brief mark a file descriptor close-on-exec
* @param int fd - file descriptor
* @return int - 0 on success, -1 with errno set on error
*/
static int _confmodule_cloexec(int fd)
{
int flags = fcntl (fd, F_GETFD);
if (flags < 0)
return flags;
if (fcntl (fd, F_SETFD, flags | FD_CLOEXEC) < 0)
return -1;
return 0;
}
/* public functions */
static int confmodule_communicate(struct confmodule *mod)
{
char buf[1023];
char *in;
size_t insize = 1024;
char *out;
//size_t outsize = 4096;
int ret = 0;
in = malloc(insize);
if (!in)
return DC_NOTOK;
memset(in, 0, insize);
//out = malloc(outsize);
//if (!out)
//return DC_NOTOK;
//memset(out, 0, outsize);
while (1) {
buf[0] = 0;
in[0] = 0;
while (strchr(buf, '\n') == NULL) {
if (signal_received) {
free(in);
return DC_OK;
}
ret = read(mod->infd, buf, sizeof(buf) - 1);
if (ret < 0) {
if (errno == EINTR)
continue;
free(in);
return DC_NOTOK;
}
if (ret == 0) {
free(in);
return DC_OK;
}
buf[ret] = 0;
if (strlen(in) + ret + 1 > insize) {
insize += sizeof(buf);
in = realloc(in, insize);
}
strcat(in, buf);
}
if (signal_received) {
free(in);
return DC_OK;
}
out = _confmodule_process(mod, in);
if (out == NULL) {
continue;
}
if (out[0] == 0) /* STOP called */
{
ret = DC_OK;
break;
}
INFO(INFO_DEBUG, "<-- %s", out);
write(mod->outfd, out, strlen(out));
write(mod->outfd, "\n", 1);
free(out);
}
free(in);
return ret;
}
static char *confmodule_process_command(struct confmodule *mod, char *cmd)
{
char *out;
out = _confmodule_process(mod, cmd);
if (out == NULL) {
asprintf(&out, "%u Not implemented", DC_NOTOK);
}
INFO(INFO_DEBUG, "<-- %s", out);
return out;
}
static int confmodule_shutdown(struct confmodule *mod)
{
int status;
while (waitpid(mod->pid, &status, WNOHANG) > 0)
sigchld_status = status;
mod->exitcode = di_exec_mangle_status(sigchld_status);
return mod->exitcode;
}
static inline void check_fd(int fd, int newfd, bool old[])
{
if (fd <= 2)
old[fd] = false;
dup2(fd, newfd);
close(fd);
}
static pid_t confmodule_run(struct confmodule *mod, int argc, char **argv)
{
pid_t pid;
int i;
char **args;
bool old[3] = { true, true, true };
int config[5]; /* 0=read/to, 1=write/to, 2=read/from, 3=write/from, 4=null */
pipe(&config[0]);
pipe(&config[2]);
switch ((pid = fork()))
{
case -1:
mod->frontend->methods.shutdown(mod->frontend);
DIE("Cannot execute client config script");
break;
case 0:
/* 50=read/to, 51=write/to, 52=read/from, 53=write/from, 54=null */
config[4] = open("/dev/null", O_RDWR);
for (i = 0; i < 5; i++)
check_fd(config[i], 50 + i, old);
for (i = 0; i <= 2; i++)
dup2(old[i] ? i : 54, DEBCONF_OLD_FD_BASE + i);
dup2(50, 0); dup2(53, 1); dup2(53, 3);
for (i = 0; i < 5; i++)
close(50 + i);
args = (char **)malloc(sizeof(char *) * argc);
for (i = 1; i < argc; i++)
args[i-1] = argv[i];
args[argc-1] = NULL;
if (execv(argv[1], args) != 0)
perror("execv");
/* should never reach here, otherwise execv failed :( */
exit (127);
default:
close(config[0]); close(config[3]);
mod->infd = config[2];
mod->outfd = config[1];
_confmodule_cloexec(mod->infd);
_confmodule_cloexec(mod->outfd);
}
mod->pid = pid;
return pid;
}
static int confmodule_update_seen_questions(struct confmodule *mod, enum seen_action action)
{
struct question *q;
struct question *qlast = NULL;
int i, narg;
switch (action)
{
case STACK_SEEN_ADD:
if (mod->seen_questions == NULL)
narg = 0;
else
narg = mod->number_seen_questions;
i = narg;
for (q = mod->frontend->questions; q != NULL; q = q->next)
narg++;
if (narg == 0)
return DC_OK;
mod->seen_questions = (char **) realloc(mod->seen_questions, sizeof(char *) * narg);
for (q = mod->frontend->questions; q != NULL; q = q->next)
{
*(mod->seen_questions+i) = strdup(q->tag);
i++;
}
mod->number_seen_questions = i;
break;
case STACK_SEEN_REMOVE:
if (mod->seen_questions == NULL)
return DC_OK;
for (q = mod->frontend->questions; q != NULL; q = q->next)
qlast = q;
for (q = qlast; q != NULL; q = q->prev)
{
if (strcmp(*(mod->seen_questions + mod->number_seen_questions - 1), q->tag) != 0)
return DC_OK;
DELETE(*(mod->seen_questions + mod->number_seen_questions - 1));
(mod->number_seen_questions) --;
if (mod->number_seen_questions == 0)
{
DELETE(mod->seen_questions);
break;
}
}
break;
case STACK_SEEN_SAVE:
if (mod->seen_questions == NULL)
return DC_OK;
narg = mod->number_seen_questions;
for (i = 0; i < narg; i++)
{
q = mod->questions->methods.get(mod->questions, *(mod->seen_questions+i));
if (q == NULL)
return DC_NOTOK;
#ifndef DI_UDEB
q->flags |= DC_QFLAG_SEEN;
#endif
DELETE(*(mod->seen_questions+i));
}
DELETE(mod->seen_questions);
mod->number_seen_questions = 0;
break;
default:
/* should never happen */
DIE("Mismatch argument in confmodule_update_seen_questions");
}
return DC_OK;
}
static int confmodule_save(struct confmodule *mod)
{
int ret = DC_OK;
if (!load_all_translations())
{
/* This isn't entirely accurate; really it should be done in
* rfc822db's implementation of mod->templates->methods.save().
* However, that doesn't have convenient access to the questions
* database, so we do it here instead for the time being.
*/
struct question *q = mod->questions->methods.get(
mod->questions, "debconf/translations-dropped");
if (q != NULL)
{
if (strcmp(question_getvalue(q, ""), "true") != 0)
{
question_setvalue(q, "true");
mod->questions->methods.set(mod->questions, q);
}
question_deref(q);
}
}
ret |= mod->update_seen_questions(mod, STACK_SEEN_SAVE);
if (mod->questions)
ret |= mod->questions->methods.save(mod->questions);
if (mod->templates)
ret |= mod->templates->methods.save(mod->templates);
return ret != DC_OK ? DC_NOTOK : DC_OK;
}
struct confmodule *confmodule_new(struct configuration *config,
struct template_db *templates, struct question_db *questions,
struct frontend *frontend)
{
struct confmodule *mod = NEW(struct confmodule);
memset(mod, 0, sizeof(struct confmodule));
mod->exitcode = 126;
mod->config = config;
mod->templates = templates;
mod->questions = questions;
mod->frontend = frontend;
mod->seen_questions = NULL;
mod->backed_up = 0;
mod->run = confmodule_run;
mod->communicate = confmodule_communicate;
mod->process_command = confmodule_process_command;
mod->shutdown = confmodule_shutdown;
mod->update_seen_questions = confmodule_update_seen_questions;
mod->save = confmodule_save;
/* TODO: I wish we don't need gross hacks like this.... */
setenv("DEBIAN_HAS_FRONTEND", "1", 1);
return mod;
}
void confmodule_delete(struct confmodule *mod)
{
DELETE(mod);
}
/* vim: expandtab sw=4
*/
|