* 3959 Arbol CT (303) 447-8093
* Boulder, CO 80301-1752
*
-********************************************************************************
-* visudo.c, sudo project
-* David R. Hieb
-* March 18, 1991
-*
-* edit, lock and parse the sudoers file in a fashion similiar to /etc/vipw.
-*******************************************************************************/
+ **************************************************************************
+ * visudo.c, sudo project
+ * David R. Hieb
+ * March 18, 1991
+ *
+ * edit, lock and parse the sudoers file in a fashion similiar to /etc/vipw.
+ */
+
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include "sudo.h"
-extern FILE *yyin, *yyout;
-extern int errno, yylineno;
+extern FILE *yyin, *yyout;
+extern int errno, yylineno;
-char buffer[BUFSIZ];
-char *sudoers = SUDOERS;
-int status = 0, err_line_no = 0;
-char *sudoers_tmp_file = TMPSUDOERS;
-FILE *sudoers_tmp_fp, *sudoers_fp;
+char buffer[BUFSIZ];
+char *sudoers = SUDOERS;
+int status = 0, err_line_no = 0;
+char *sudoers_tmp_file = TMPSUDOERS;
+FILE *sudoers_tmp_fp, *sudoers_fp;
void Exit()
{
-fclose(sudoers_tmp_fp);
-unlink(sudoers_tmp_file);
-exit(1);
+ (void) fclose(sudoers_tmp_fp);
+ (void) unlink(sudoers_tmp_file);
+ exit(1);
}
+
main(argc, argv)
-int argc;
-char **argv;
+ int argc;
+ char **argv;
{
-int fd;
-struct stat sbuf;
-
-/* handle the signals */
-signal(SIGILL, Exit);
-signal(SIGTRAP, Exit);
-signal(SIGBUS, Exit);
-signal(SIGSEGV, Exit);
-signal(SIGTERM, Exit);
-
-signal(SIGHUP, SIG_IGN);
-signal(SIGINT, SIG_IGN);
-signal(SIGQUIT, SIG_IGN);
-
-setbuf(stderr, NULL);
-
-/* we only want root to be able to read/write the sudoers_tmp_file */
-umask(077);
-
-/* open the sudoers file read only */
-if ((sudoers_fp = fopen(sudoers, "r")) == NULL) {
- fprintf(stderr, "%s: ", *argv);
- perror(sudoers);
- Exit();
+ int fd;
+ struct stat sbuf;
+
+ /*
+ * handle the signals
+ */
+ (void) signal(SIGILL, Exit);
+ (void) signal(SIGTRAP, Exit);
+ (void) signal(SIGBUS, Exit);
+ (void) signal(SIGSEGV, Exit);
+ (void) signal(SIGTERM, Exit);
+
+ (void) signal(SIGHUP, SIG_IGN);
+ (void) signal(SIGINT, SIG_IGN);
+ (void) signal(SIGQUIT, SIG_IGN);
+
+ setbuf(stderr, NULL);
+
+ /*
+ * we only want root to be able to read/write the sudoers_tmp_file
+ */
+ umask(077);
+
+ /*
+ * open the sudoers file read only
+ */
+ if ((sudoers_fp = fopen(sudoers, "r")) == NULL) {
+ (void) fprintf(stderr, "%s: ", *argv);
+ perror(sudoers);
+ Exit();
}
-/* open the temporary sudoers file with the correct flags */
-if ((fd = open(sudoers_tmp_file, O_WRONLY|O_CREAT|O_EXCL, 0600)) < 0) {
- if (errno == EEXIST) {
- fprintf(stderr, "%s: sudoers file busy\n", *argv);
- exit(1);
- }
- fprintf(stderr, "%s: ", *argv);
- perror(sudoers_tmp_file);
- exit(1);
+ /*
+ * open the temporary sudoers file with the correct flags
+ */
+ if ((fd = open(sudoers_tmp_file, O_WRONLY | O_CREAT | O_EXCL, 0600)) < 0) {
+ if (errno == EEXIST) {
+ (void) fprintf(stderr, "%s: sudoers file busy\n", *argv);
+ exit(1);
+ }
+ (void) fprintf(stderr, "%s: ", *argv);
+ perror(sudoers_tmp_file);
+ exit(1);
}
-/* get a STREAM file pointer to the temporary sudoers file */
-if ((sudoers_tmp_fp = fdopen(fd, "w")) == NULL) {
- fprintf(stderr, "%s: ", *argv);
- perror(sudoers_tmp_file);
- Exit();
+ /*
+ * get a STREAM file pointer to the temporary sudoers file
+ */
+ if ((sudoers_tmp_fp = fdopen(fd, "w")) == NULL) {
+ (void) fprintf(stderr, "%s: ", *argv);
+ perror(sudoers_tmp_file);
+ Exit();
}
-/* transfer the contents of the sudoers file to the temporary sudoers file */
-while (fgets(buffer, sizeof(buffer) - 1, sudoers_fp) != NULL) {
- fputs(buffer, sudoers_tmp_fp);
+ /*
+ * transfer the contents of the sudoers file to the temporary sudoers file
+ */
+ while (fgets(buffer, sizeof(buffer) - 1, sudoers_fp) != NULL) {
+ fputs(buffer, sudoers_tmp_fp);
}
-fclose(sudoers_fp);
-fclose(sudoers_tmp_fp);
-
-do {
- /* build strings in buffer to be executed by system() */
- sprintf(buffer, "%s +%d %s", EDITOR, err_line_no, sudoers_tmp_file);
-
- /* edit the file */
- if (system(buffer) == 0) {
-
- /* can't stat file */
- if (stat(sudoers_tmp_file, &sbuf) < 0) {
- fprintf(stderr, "%s: can't stat temporary file, %s unchanged\n",
- sudoers, *argv);
- Exit();
- }
- /* file has size == 0 */
- if (sbuf.st_size == 0) {
- fprintf(stderr, "%s: bad temporary file, %s unchanged\n",
- sudoers, *argv);
- Exit();
- }
- /* re-open the sudoers file for parsing */
- if ((sudoers_tmp_fp = fopen(sudoers_tmp_file, "r")) == NULL) {
- fprintf(stderr, "%s: can't re-open temporary file, %s unchanged\n",
- sudoers, *argv);
- Exit();
- }
-
- yyin = sudoers_tmp_fp;
- yyout = stdout;
-
- /* parse the file */
- if (yyparse()) {
- fprintf(stderr, "yyparse() failed\n");
- Exit();
- }
-
- /*
- * the first time we get an error, set status to yylineno which
- * will be the line number after the line with the error.
- * then, if we have gotten an error, set err_line_no to the
- * correct line so that when we edit the file err_line_no will
- * be correct. at this time we also reset status and yylineno
- * to their default values so that the next time yyparse() is
- * called, they will be initialized correctly.
- */
- err_line_no = (status == 0) ? 0 : status - 1;
- status = 0;
- yylineno = 1;
-
- fclose(sudoers_tmp_fp);
- }
+ (void) fclose(sudoers_fp);
+ (void) fclose(sudoers_tmp_fp);
+
+ do {
+ /*
+ * build strings in buffer to be executed by system()
+ */
+ (void) sprintf(buffer, "%s +%d %s", EDITOR, err_line_no,
+ sudoers_tmp_file);
+
+ /* edit the file */
+ if (system(buffer) == 0) {
+
+ /* can't stat file */
+ if (stat(sudoers_tmp_file, &sbuf) < 0) {
+ (void) fprintf(stderr, "%s: can't stat temporary file, %s unchanged\n",
+ sudoers, *argv);
+ Exit();
+ }
+
+ /* file has size == 0 */
+ if (sbuf.st_size == 0) {
+ (void) fprintf(stderr, "%s: bad temporary file, %s unchanged\n",
+ sudoers, *argv);
+ Exit();
+ }
+
+ /* re-open the sudoers file for parsing */
+ if ((sudoers_tmp_fp = fopen(sudoers_tmp_file, "r")) == NULL) {
+ (void) fprintf(stderr, "%s: can't re-open temporary file, %s unchanged\n",
+ sudoers, *argv);
+ Exit();
+ }
+ yyin = sudoers_tmp_fp;
+ yyout = stdout;
+
+ /* parse the file */
+ if (yyparse()) {
+ (void) fprintf(stderr, "yyparse() failed\n");
+ Exit();
+ }
+
+ /*
+ * the first time we get an error, set status to yylineno which
+ * will be the line number after the line with the error. then,
+ * if we have gotten an error, set err_line_no to the correct
+ * line so that when we edit the file err_line_no will be
+ * correct. at this time we also reset status and yylineno to
+ * their default values so that the next time yyparse() is
+ * called, they will be initialized correctly.
+ */
+ err_line_no = (status == 0) ? 0 : status - 1;
+ status = 0;
+ yylineno = 1;
+
+ (void) fclose(sudoers_tmp_fp);
+ }
} while (err_line_no);
-/* once the temporary sudoers file is gramatically correct, we can
- * rename it to the real sudoers file.
- */
-if (rename(sudoers_tmp_file, sudoers) != 0) {
- fprintf(stderr, "%s: ", *argv), perror("rename");
- }
-else {
- if (chmod(sudoers, 0400) != 0) {
- perror("chmod: failed");
- }
- exit(0);
+ /*
+ * once the temporary sudoers file is gramatically correct, we can
+ * rename it to the real sudoers file.
+ */
+ if (rename(sudoers_tmp_file, sudoers) != 0) {
+ (void) fprintf(stderr, "%s: ", *argv);
+ perror("rename");
+ } else {
+ if (chmod(sudoers, 0400) != 0)
+ perror("chmod: failed");
+ exit(0);
}
}
projects / sudo / commitdiff