1 files changed, 46 insertions, 0 deletions

diff --git a/biportal/main.c b/biportal/main.c
new file mode 100644
index 0000000..57085d7
--- a/dev/null
+++ b/biportal/main.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+int main (int argc, const char * argv[]) {
+    if(geteuid()) return fprintf(stderr, "unprivileged\n"), printf("%d",EPERM), 1;
+    if(argc==1) {
+        struct stat st;
+        if(stat(*argv, &st)) return fprintf(stderr, "failed to self-stat\n"), printf("%d",errno), 2;
+        if(st.st_uid!=0 && chown(*argv, 0, 0)) return fprintf(stderr, "failed to self-chown\n"), printf("%d",errno), 3;
+        if((!(st.st_mode&S_ISUID)) && chmod(*argv, S_ISUID|0555)) return fprintf(stderr, "failed to self-chmod\n"), printf("%d",errno), 4;
+        return printf("0"),0;
+    }
+    if(argc==2 && !strcmp(argv[1],"-k")) {
+        pid_t p = fork();
+        if(p<0) return fprintf(stderr, "failed to fork\n"), printf("%d",errno), 5;
+        if(!p) {
+            if(setuid(0)) return fprintf(stderr,"failed to setuid\n"), printf("%d",errno),8;
+            execl("/bin/launchctl","/bin/launchctl", "remove", "com.apple.tftpd", NULL);
+            exit(errno);
+        }
+        int r, wp;
+        while((wp=waitpid(p,&r,0))<0 && errno==EINTR);
+        if(p!=wp) return fprintf(stderr,"failed to wait for launchctl"), 6;
+        if(!WIFEXITED(r)) return fprintf(stderr,"launchctl failed"), 7;
+        return fprintf(stderr,"launchctl terminated with %d",WEXITSTATUS(r)), r;
+    }
+    if(argc!=4) return fprintf(stderr, "Usage: %s s h p\n",*argv), 10;
+    struct sockaddr_in sin; memset(&sin,0,sizeof(sin));
+    sin.sin_family = AF_INET;
+    sin.sin_addr.s_addr = inet_addr(argv[2]);
+    sin.sin_port = htons(strtol(argv[3],NULL,0));
+    int rc;
+    printf("%d",
+           rc=(bind( (int)strtol(argv[1],NULL,0), (struct sockaddr*)&sin,sizeof(sin) )<0)
+           ? errno : 0);
+    return rc;
+}
+
+