New command -launch_frontend
This commit is contained in:
@ -24,6 +24,7 @@
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#include <errno.h>
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#include <signal.h>
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#include <pthread.h>
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#include <fcntl.h>
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/* for -charset */
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@ -3673,3 +3674,215 @@ ex:;
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return(1);
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}
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/* >>> make configurable by configure.ac # define Xorriso_allow_launch_frontenD 1 */
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/* # define Xorriso_allow_launch_frontend_suiD 1 */
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int Xorriso_launch_frontend(struct XorrisO *xorriso, char *cmd,
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char *cmd_pipe_adr, char *reply_pipe_adr, int flag)
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{
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int command_pipe[2], reply_pipe[2], ret, i, argc= 0, cpid, is_banned= 0;
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char **argv= NULL, **exec_argv= NULL, *sfe= NULL, *adrpt;
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struct stat stbuf;
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Xorriso_alloc_meM(sfe, char, 5 * SfileadrL);
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for(i= 0; i < 2; i++)
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command_pipe[i]= reply_pipe[i]= -1;
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#ifndef Xorriso_allow_launch_frontenD
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/* To be controlled by: configure --enable-external-filters */
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sprintf(xorriso->info_text, "-launch_frontend : Banned at compile time.");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
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sprintf(xorriso->info_text,
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"This may be changed at compile time by ./configure option --enable-external-filters");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "HINT", 0);
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is_banned= 1;
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#endif /* ! Xorriso_allow_launch_frontenD */
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#ifndef Xorriso_allow_launch_frontend_suiD
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/* To be controlled by: configure --enable-external-filters-setuid */
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if(getuid() != geteuid()) {
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sprintf(xorriso->info_text,
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"-set_filter: UID and EUID differ. Will not run external programs.");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FATAL", 0);
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sprintf(xorriso->info_text,
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"This may be changed at compile time by ./configure option --enable-external-filters-setuid");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "HINT", 0);
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is_banned= 1;
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}
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#endif /* ! Xorriso_allow_launch_frontend_suiD */
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if(is_banned)
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{ret= 0; goto ex;}
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ret= Xorriso_parse_line(xorriso, cmd, "", "", 0, &argc, &argv, 1 | 64);
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if(ret <= 0)
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goto ex;
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if(argc > 0) {
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if(strchr(argv[0], '/') == NULL) {
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sprintf(xorriso->info_text,
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"-launch_frontend : Command path does not contain a '/'-character");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
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{ret= 0; goto ex;}
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}
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/* Add a NULL pointer for execv() */
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Xorriso_alloc_meM(exec_argv, char *, argc + 1);
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if(exec_argv == NULL) {
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Xorriso_no_malloc_memory(xorriso, NULL, 0);
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ret= -1; goto ex;
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}
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for(i= 0; i < argc; i++)
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exec_argv[i]= argv[i];
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exec_argv[argc]= NULL;
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} else if(cmd_pipe_adr[0] == 0 || reply_pipe_adr[0] == 0)
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{ret= 0; goto ex;}
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if(cmd_pipe_adr[0] && reply_pipe_adr[0]) {
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/* Create named pipes if needed */
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for(i= 0; i < 2; i++) {
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if(i == 0)
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adrpt= cmd_pipe_adr;
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else
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adrpt= reply_pipe_adr;
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ret= stat(adrpt, &stbuf);
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if(ret == -1) {
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ret= mknod(adrpt, S_IFIFO | S_IRWXU | S_IRWXG | S_IRWXO | S_IRWXO,
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(dev_t) 0);
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if(ret == -1) {
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sprintf(xorriso->info_text,
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"-launch_frontend: Cannot create named pipe %s",
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Text_shellsafe(adrpt, sfe, 0));
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno,
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"FAILURE", 0);
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ret= 0; goto ex;
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}
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}
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}
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} else {
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ret= pipe(command_pipe);
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if (ret == -1) {
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no_pipe_open:
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sprintf(xorriso->info_text,
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"-launch_frontend: Failed to create a nameless pipe object");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE", 0);
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ret= 0; goto ex;
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}
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ret= pipe(reply_pipe);
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if (ret == -1)
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goto no_pipe_open;
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}
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if(argc > 0) {
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cpid = fork();
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if (cpid == -1) {
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sprintf(xorriso->info_text,
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"-launch_frontend: Failed to create a child process");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE", 0);
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ret= 0; goto ex;
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}
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} else
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cpid= -1; /* Dummy child id */
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if (cpid != 0) {
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/* Parent becomes the xorriso slave */
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if(cmd_pipe_adr[0] && reply_pipe_adr[0]) {
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command_pipe[0]= open(cmd_pipe_adr, O_RDONLY);
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if(command_pipe[0] == -1) {
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sprintf(xorriso->info_text,
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"-launch_frontend: Failed to open named command pipe %s",
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Text_shellsafe(cmd_pipe_adr, sfe, 0));
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno,
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"FAILURE", 0);
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ret= 0; goto ex;
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}
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reply_pipe[1]= open(reply_pipe_adr, O_WRONLY | O_APPEND);
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if(reply_pipe[1] == -1) {
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sprintf(xorriso->info_text,
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"-launch_frontend: Failed to open named reply pipe %s",
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Text_shellsafe(reply_pipe_adr, sfe, 0));
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno,
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"FAILURE", 0);
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ret= 0; goto ex;
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}
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} else {
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/* Close unused pipe ends */
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close(command_pipe[1]);
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close(reply_pipe[0]);
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}
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close(0);
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close(1);
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close(2);
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ret= dup2(command_pipe[0], 0);
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if(ret == -1) {
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no_dup:;
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sprintf(xorriso->info_text,
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"-launch_frontend: Failed to connect pipe to xorriso standard i/o channels");
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Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE", 0);
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ret= -1; goto ex;
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}
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ret= dup2(reply_pipe[1], 1);
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if(ret == -1)
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goto no_dup;
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ret= dup2(reply_pipe[1], 2);
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if(ret == -1)
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goto no_dup;
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ret= 1; goto ex;
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}
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/* Child becomes the frontend program */
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/* Close unused pipe ends */;
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if(cmd_pipe_adr[0] && reply_pipe_adr[0]) {
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command_pipe[1]= open(cmd_pipe_adr, O_WRONLY | O_APPEND);
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if(command_pipe[1] == -1) {
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fprintf(stderr,
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"xorriso: -launch_frontend: Failed to open named command pipe '%s'\n",
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cmd_pipe_adr);
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perror("xorriso: -launch_frontend");
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exit(1);
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}
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reply_pipe[0]= open(reply_pipe_adr, O_RDONLY);
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if(reply_pipe[0] == -1) {
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fprintf(stderr,
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"xorriso: -launch_frontend: Failed to open named reply pipe '%s'\n",
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reply_pipe_adr);
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exit(1);
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}
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} else {
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close(command_pipe[0]);
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close(reply_pipe[1]);
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}
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close(0);
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close(1);
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ret= dup2(command_pipe[1], 1);
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if(ret == -1) {
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perror("xorriso: -launch_frontend: Error on redirecting standard output for frontend");
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exit(1);
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}
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ret= dup2(reply_pipe[0], 0);
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if(ret == -1) {
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perror("xorriso: -launch_frontend: Error on redirecting standard input for frontend");
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exit(1);
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}
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execv(exec_argv[0], exec_argv);
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fprintf(stderr, "xorriso: -launch_frontend: Failure to start program '%s'\n",
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exec_argv[0]);
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perror("xorriso: -launch_frontend");
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exit(1);
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ex:;
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Xorriso__dispose_words(&argc, &argv);
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Xorriso_free_meM(exec_argv);
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Xorriso_free_meM(sfe);
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return(ret);
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}
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