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@ -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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