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-rw-r--r--biportal/main.c46
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;
+}
+
+