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/*
* (C) 2020-2021 by Christian Hesse <mail@eworm.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* Running Mikrotik netinstall with unprivileged user requires ambient
* capability CAP_NET_BIND_SERVICE. This is a wrapper to run it in wine.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/capability.h>
#include <sys/stat.h>
#include <unistd.h>
#define WINE_PATH "/usr/bin/wine"
#define NETINSTALL_EXE_PATH "/usr/lib/netinstall/netinstall.exe"
int main(int argc, char ** argv) {
cap_t caps;
cap_flag_value_t cap_effective = 0, cap_permitted = 0;
const cap_value_t cap = CAP_NET_BIND_SERVICE;
if (!CAP_IS_SUPPORTED(cap)) {
fprintf(stderr, "Capability CAP_NET_BIND_SERVICE is not supported.\n");
goto out10;
}
if ((caps = cap_get_proc()) == NULL) {
perror("cap_get_proc");
goto out10;
}
if (cap_get_flag(caps, cap, CAP_EFFECTIVE, &cap_effective) == -1 ||
cap_get_flag(caps, cap, CAP_PERMITTED, &cap_permitted) == -1 ||
cap_effective == 0 || cap_permitted == 0) {
fprintf(stderr, "Capability CAP_NET_BIND_SERVICE is not available. Set it with setcap(8).\n");
goto out20;
}
if (cap_set_flag(caps, CAP_INHERITABLE, 1, &cap, CAP_SET) == -1) {
perror("cap_set_flag: setting CAP_INHERITABLE for CAP_NET_BIND_SERVICE");
goto out20;
}
if (cap_set_proc(caps) == -1) {
perror("cap_set_proc");
goto out20;
}
if (cap_free(caps) == -1) {
perror("cap_free");
goto out10;
}
if (cap_set_ambient(cap, CAP_SET) == -1) {
perror("cap_set_ambient: setting CAP_NET_BIND_SERVICE");
goto out10;
}
struct stat st;
const char *home = getenv("HOME");
char wineprefix[256];
snprintf(wineprefix, sizeof(wineprefix), "%s/.netinstall/wine/", home);
setenv("WINEPREFIX", wineprefix, 1);
setenv("WINEARCH", "win64", 1);
setenv("WINEDLLOVERRIDES", "mscoree=", 1);
setenv("WINEDEBUG", "-all", 1);
if (chdir(home) == -1) {
perror("chdir: changing to home directory");
goto out10;
}
if (stat(".netinstall/", &st) == -1) {
if (mkdir(".netinstall/", 0777) == -1) {
perror("mkdir: creating directory '.netinstall/'");
goto out10;
}
if (system("wineboot -u") != 0) {
perror("system: running wineboot");
goto out10;
}
}
char * const newargv[] = { "wine", NETINSTALL_EXE_PATH, NULL };
execv(WINE_PATH, newargv);
/* execv() returns only on error */
perror("execv");
out20:
cap_free(caps);
out10:
return EXIT_FAILURE;
}
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