EXEC_PREFER_APPLETS support by Gabriel L. Somlo <somlo@cmu.edu>

git-svn-id: svn://busybox.net/trunk/busybox@17785 69ca8d6d-28ef-0310-b511-8ec308f3f277

22 files changed, 39 insertions, 28 deletions

diff --git a/archival/tar.c b/archival/tar.c
index 48c4f3f8c..d8e36749e 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -529,7 +529,7 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
                         close(gzipStatusPipe[0]);
                         fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC);  /* close on exec shows success */
 
-                        execlp(zip_exec, zip_exec, "-f", NULL);
+                        BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
                         vfork_exec_errno = errno;
 
                         close(gzipStatusPipe[1]);
diff --git a/console-tools/openvt.c b/console-tools/openvt.c
index 9296219bd..eb9f49fe2 100644
--- a/console-tools/openvt.c
+++ b/console-tools/openvt.c
@@ -36,7 +36,7 @@ int openvt_main(int argc, char **argv)
                 dup2(fd, STDERR_FILENO);
                 while (fd > 2) close(fd--);
 
-                execvp(argv[2], &argv[2]);
+                BB_EXECVP(argv[2], &argv[2]);
                 _exit(1);
         }
         return EXIT_SUCCESS;
diff --git a/coreutils/chroot.c b/coreutils/chroot.c
index 16c743fef..fcd70f21a 100644
--- a/coreutils/chroot.c
+++ b/coreutils/chroot.c
@@ -33,6 +33,6 @@ int chroot_main(int argc, char **argv)
                 argv[1] = (char *) "-i";
         }
 
-        execvp(*argv, argv);
+        BB_EXECVP(*argv, argv);
         bb_perror_msg_and_die("cannot execute %s", *argv);
 }
diff --git a/coreutils/env.c b/coreutils/env.c
index 04279f3e0..7be0c63a5 100644
--- a/coreutils/env.c
+++ b/coreutils/env.c
@@ -81,7 +81,7 @@ int env_main(int argc, char** argv)
         }
 
         if (*argv) {
-                execvp(*argv, argv);
+                BB_EXECVP(*argv, argv);
                 /* SUSv3-mandated exit codes. */
                 xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
                 bb_perror_msg_and_die("%s", *argv);
diff --git a/coreutils/install.c b/coreutils/install.c
index dd73fb693..c105addc5 100644
--- a/coreutils/install.c
+++ b/coreutils/install.c
@@ -126,7 +126,7 @@ int install_main(int argc, char **argv)
                         ret = EXIT_FAILURE;
                 }
                 if (flags & OPT_STRIP) {
-                        if (execlp("strip", "strip", dest, NULL) == -1) {
+                        if (BB_EXECLP("strip", "strip", dest, NULL) == -1) {
                                 bb_perror_msg("strip");
                                 ret = EXIT_FAILURE;
                         }
diff --git a/coreutils/nice.c b/coreutils/nice.c
index b7bff6a52..328531528 100644
--- a/coreutils/nice.c
+++ b/coreutils/nice.c
@@ -47,7 +47,7 @@ int nice_main(int argc, char **argv)
                 }
         }
 
-        execvp(*argv, argv);            /* Now exec the desired program. */
+        BB_EXECVP(*argv, argv);         /* Now exec the desired program. */
 
         /* The exec failed... */
         xfunc_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */
diff --git a/coreutils/nohup.c b/coreutils/nohup.c
index a9944b7f4..6a6c70e13 100644
--- a/coreutils/nohup.c
+++ b/coreutils/nohup.c
@@ -53,7 +53,7 @@ int nohup_main(int argc, char **argv)
                 close(nullfd);
         signal(SIGHUP, SIG_IGN);
 
-        execvp(argv[1], argv+1);
+        BB_EXECVP(argv[1], argv+1);
         if (ENABLE_FEATURE_CLEAN_UP && home)
                 free((char*)nohupout);
         bb_perror_msg_and_die("%s", argv[1]);
diff --git a/e2fsprogs/fsck.c b/e2fsprogs/fsck.c
index 9ec31d2a3..ad22fcd7a 100644
--- a/e2fsprogs/fsck.c
+++ b/e2fsprogs/fsck.c
@@ -677,7 +677,7 @@ static void execute(const char *type, const char *device, const char *mntpt,
                                  * Use "fsck -s" to avoid... */
                                 close(0);
                         }
-                        execvp(argv[0], argv);
+                        BB_EXECVP(argv[0], argv);
                         bb_perror_msg_and_die("%s", argv[0]);
                 }
         }
diff --git a/findutils/xargs.c b/findutils/xargs.c
index c2060f804..44dbcdad0 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -60,7 +60,7 @@ static int xargs_exec(char *const *args)
 
         if (p == 0) {
                 /* vfork -- child */
-                execvp(args[0], args);
+                BB_EXECVP(args[0], args);
                 exec_errno = errno;     /* set error to shared stack */
                 _exit(1);
         }
diff --git a/include/libbb.h b/include/libbb.h
index 7342f89f6..babb39ba9 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -562,12 +562,13 @@ char *find_execable(const char *filename);
 int exists_execable(const char *filename);
 
 #ifdef ENABLE_FEATURE_EXEC_PREFER_APPLETS
-#define BB_EXECVP(prog,cmd) \
-        execvp((find_applet_by_name(prog)) ? CONFIG_BUSYBOX_EXEC_PATH : prog, cmd)
+int bb_execvp(const char *file, char *const argv[]);
+#define BB_EXECVP(prog,cmd) bb_execvp(prog,cmd)
 #define BB_EXECLP(prog,cmd,...) \
-        execlp((find_applet_by_name(prog)) ? CONFIG_BUSYBOX_EXEC_PATH : prog, cmd, __VA_ARGS__)
+        execlp((find_applet_by_name(prog)) ? CONFIG_BUSYBOX_EXEC_PATH : prog, \
+                cmd, __VA_ARGS__)
 #else
-#define BB_EXECVP(prog,cmd) execvp(prog,cmd)
+#define BB_EXECVP(prog,cmd)     execvp(prog,cmd)
 #define BB_EXECLP(prog,cmd,...) execlp(prog,cmd, __VA_ARGS__) 
 #endif
 
diff --git a/libbb/execable.c b/libbb/execable.c
index 817c06736..601c7539e 100644
--- a/libbb/execable.c
+++ b/libbb/execable.c
@@ -59,3 +59,13 @@ int exists_execable(const char *filename)
         }
         return 0;
 }
+
+#ifdef ENABLE_FEATURE_EXEC_PREFER_APPLETS
+/* just like the real execvp, but try to launch an applet named 'file' first
+ */
+int bb_execvp(const char *file, char *const argv[])
+{
+        return execvp(find_applet_by_name(file) ? CONFIG_BUSYBOX_EXEC_PATH : file,
+                                        argv);
+}
+#endif
diff --git a/loginutils/adduser.c b/loginutils/adduser.c
index 8193aea82..b6d0c62ea 100644
--- a/loginutils/adduser.c
+++ b/loginutils/adduser.c
@@ -80,7 +80,7 @@ static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN;
 static void passwd_wrapper(const char *login)
 {
         static const char prog[] = "passwd";
-        execlp(prog, prog, login, NULL);
+        BB_EXECLP(prog, prog, login, NULL);
         bb_error_msg_and_die("failed to execute '%s', you must set the password for '%s' manually", prog, login);
 }
 
diff --git a/loginutils/login.c b/loginutils/login.c
index a19191b8c..830df0a7f 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -357,7 +357,7 @@ auth_failed:
                                 setenv("LOGIN_UID", utoa(pw->pw_uid), 1);
                                 setenv("LOGIN_GID", utoa(pw->pw_gid), 1);
                                 setenv("LOGIN_SHELL", pw->pw_shell, 1);
-                                execvp(script, t_argv);
+                                BB_EXECVP(script, t_argv);
                                 exit(1);
                         default: /* parent */
                                 wait(NULL);
diff --git a/miscutils/devfsd.c b/miscutils/devfsd.c
index 69c698781..96c172cb8 100644
--- a/miscutils/devfsd.c
+++ b/miscutils/devfsd.c
@@ -378,7 +378,7 @@ static void fork_and_execute(int die, char *arg0, char **arg )
          /* Child : if arg0 != NULL do execvp */
         if(arg0 != NULL )
         {
-                execvp (arg0, arg);
+                BB_EXECVP(arg0, arg);
                 msg_logger_and_die(LOG_ERR, "execvp");
         }
 }
diff --git a/miscutils/setsid.c b/miscutils/setsid.c
index b4d5ced46..6db07be5f 100644
--- a/miscutils/setsid.c
+++ b/miscutils/setsid.c
@@ -36,7 +36,7 @@ int setsid_main(int argc, char *argv[])
 
         setsid();  /* no error possible */
 
-        execvp(argv[1], argv + 1);
+        BB_EXECVP(argv[1], argv + 1);
 
         bb_perror_msg_and_die("%s", argv[1]);
 }
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
index cf6a8be99..b3bf4902e 100644
--- a/miscutils/taskset.c
+++ b/miscutils/taskset.c
@@ -91,7 +91,7 @@ int taskset_main(int argc, char** argv)
                 goto print_aff;
         }
         ++argv;
-        execvp(*argv, argv);
+        BB_EXECVP(*argv, argv);
         bb_perror_msg_and_die("%s", *argv);
 }
 #undef OPT_p
diff --git a/miscutils/time.c b/miscutils/time.c
index 56f1d4ab8..a45919502 100644
--- a/miscutils/time.c
+++ b/miscutils/time.c
@@ -410,7 +410,7 @@ static void run_command(char *const *cmd, resource_t * resp)
         else if (pid == 0) {    /* If child.  */
                 /* Don't cast execvp arguments; that causes errors on some systems,
                    versus merely warnings if the cast is left off.  */
-                execvp(cmd[0], cmd);
+                BB_EXECVP(cmd[0], cmd);
                 bb_error_msg("cannot run %s", cmd[0]);
                 _exit(errno == ENOENT ? 127 : 126);
         }
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index ce3b9bab7..ccebecd95 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -1004,7 +1004,7 @@ static int popen2(FILE **in, FILE **out, char *command, ...)
                 close(infd[1]);
                 close(outfd[0]);
                 close(outfd[1]);
-                execvp(command, argv);
+                BB_EXECVP(command, argv);
                 exit(127);
         default:                        /* parent */
                 *in = fdopen(infd[1], "w");
diff --git a/networking/nc.c b/networking/nc.c
index c1e881162..1bdecaf5e 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -149,7 +149,7 @@ int nc_main(int argc, char **argv)
                 }
                 dup2(0, 1);
                 dup2(0, 2);
-                USE_NC_EXTRA(execvp(execparam[0], execparam);)
+                USE_NC_EXTRA(BB_EXECVP(execparam[0], execparam);)
                 /* Don't print stuff or it will go over the wire.... */
                 _exit(127);
         }
diff --git a/runit/chpst.c b/runit/chpst.c
index 053051d1d..7b907845f 100644
--- a/runit/chpst.c
+++ b/runit/chpst.c
@@ -310,7 +310,7 @@ int chpst_main(int argc, char **argv)
         if (OPT_nostdin) close(0);
         if (OPT_nostdout) close(1);
         if (OPT_nostderr) close(2);
-        execvp(argv[0], argv);
+        BB_EXECVP(argv[0], argv);
         bb_perror_msg_and_die("exec %s", argv[0]);
 }
 
@@ -322,7 +322,7 @@ static void setuidgid(int argc, char **argv)
         if (!account) bb_show_usage();
         if (!*++argv) bb_show_usage();
         suidgid((char*)account);
-        execvp(argv[0], argv);
+        BB_EXECVP(argv[0], argv);
         bb_perror_msg_and_die("exec %s", argv[0]);
 }
 
@@ -334,7 +334,7 @@ static void envuidgid(int argc, char **argv)
         if (!account) bb_show_usage();
         if (!*++argv) bb_show_usage();
         euidgid((char*)account);
-        execvp(argv[0], argv);
+        BB_EXECVP(argv[0], argv);
         bb_perror_msg_and_die("exec %s", argv[0]);
 }
 
@@ -346,7 +346,7 @@ static void envdir(int argc, char **argv)
         if (!dir) bb_show_usage();
         if (!*++argv) bb_show_usage();
         edir(dir);
-        execvp(argv[0], argv);
+        BB_EXECVP(argv[0], argv);
         bb_perror_msg_and_die("exec %s", argv[0]);
 }
 
@@ -369,6 +369,6 @@ static void softlimit(int argc, char **argv)
         argv += optind;
         if (!argv[0]) bb_show_usage();
         slimit();
-        execvp(argv[0], argv);
+        BB_EXECVP(argv[0], argv);
         bb_perror_msg_and_die("exec %s", argv[0]);
 }
diff --git a/runit/runsvdir.c b/runit/runsvdir.c
index d9053ad6a..2d2b5db31 100644
--- a/runit/runsvdir.c
+++ b/runit/runsvdir.c
@@ -73,7 +73,7 @@ static void runsv(int no, const char *name)
                 sig_uncatch(SIGHUP);
                 sig_uncatch(SIGTERM);
                 if (pgrp) setsid();
-                execvp(prog[0], prog);
+                BB_EXECVP(prog[0], prog);
                 //pathexec_run(*prog, prog, (char* const*)environ);
                 fatal2_cannot("start runsv ", name);
         }
diff --git a/util-linux/setarch.c b/util-linux/setarch.c
index 8f4e308d4..a7a45ec4d 100644
--- a/util-linux/setarch.c
+++ b/util-linux/setarch.c
@@ -46,7 +46,7 @@ retry:
         if (personality(pers) >= 0) {
 
                 /* Try to execute the program */
-                execvp(argv[0], argv);
+                BB_EXECVP(argv[0], argv);
         }
 
         bb_perror_msg_and_die("%s", argv[0]);