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/*
* ixhdr.c -- bootstrap header for icode files
*
* (used when BinaryHeader is defined)
*/
#include "../h/gsupport.h"
static void doiconx (char *argv[]);
static void hsyserr (char *av, char *file);
int main(int argc, char *argv[]) {
char *argvx[1000];
/*
* Abort if we've been invoked with setuid or setgid privileges.
* Allowing such usage would open a huge security hole, because
* there is no way to ensure that the right iconx will interpret
* the right user program.
*/
if (getuid() != geteuid() || getgid() != getegid())
hsyserr(argv[0], ": cannot run an Icon program setuid/setgid");
/*
* Shift the argument list to make room for iconx in argv[0].
*/
do
argvx[argc + 1] = argv[argc];
while (argc--);
/*
* Pass the arglist and execute iconx.
*/
doiconx(argvx);
return EXIT_FAILURE;
}
/*
* doiconx(argv) - execute iconx, passing argument list.
*
* To find the interpreter, first check the environment variable ICONX.
* If it defines a path, it had better work, else we abort.
*
* Failing that, check the directory containing the icode file,
* and if that doesn't work, search $PATH.
*/
static void doiconx(char *argv[]) {
char xcmd[256];
if ((argv[0] = getenv("ICONX")) != NULL && argv[0][0] != '\0') {
execv(argv[0], argv); /* exec file specified by $ICONX */
hsyserr("cannot execute $ICONX: ", argv[0]);
}
argv[0] = relfile(argv[1], "/../iconx" ExecSuffix);
execv(argv[0], argv); /* try iconx in same dir; just continue if absent */
if (findonpath("iconx" ExecSuffix, xcmd, sizeof(xcmd))) {
argv[0] = xcmd;
execv(xcmd, argv);
hsyserr("cannot execute ", xcmd);
}
hsyserr(argv[1], ": cannot find iconx" ExecSuffix);
}
/*
* hsyserr(s1, s2) - print s1 and s2 on stderr, then abort.
*/
static void hsyserr(char *s1, char *s2) {
fprintf(stderr, "%s%s\n", s1, s2);
exit(EXIT_FAILURE);
}
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