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-rw-r--r--src/listener.c99
1 files changed, 0 insertions, 99 deletions
diff --git a/src/listener.c b/src/listener.c
deleted file mode 100644
index e24cf55..0000000
--- a/src/listener.c
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
-** listener.c -- a datagram sockets "server" demo
-*/
-
-#include "common.h"
-
-int main(int argc, char **argv, char **envp) {
- int fd;
- int numbytes;
- struct sockaddr_storage their_addr;
- char buf[MAXBUFLEN];
- socklen_t addr_len;
-
- /* setup socket, parse cmd line */
- {
- struct sockaddr_in6 ba;
- struct ipv6_mreq ga;
- if (argc > 2) {
- fprintf(stderr, "usage: %s [interface]\n", argv[0]);
- exit(1);
- }
- ENP((fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)), "listener: socket");
- if (argc == 2) {
- inet_pton(AF_INET6, "ff02::1", &(ba.sin6_addr));
- if ((ba.sin6_scope_id = if_nametoindex(argv[1])) == 0) {
- fprintf(stderr, "interface not found\n");
- exit(1);
- }
- }else{
- ba.sin6_addr = in6addr_any;
- ba.sin6_scope_id = 0;
- }
- ba.sin6_family = AF_INET6;
- ba.sin6_port = htons(SERVERPORT);
- ba.sin6_flowinfo = 0;
- ENP(bind(fd, (struct sockaddr*) &ba, sizeof ba), "listener: bind");
- }
-
- /* daemonize */
-#ifndef DEBUG
- switch (fork()) {
- case 0:
- ENP(setsid(), "setsid");
- umask(0);
- break;
- case -1:
- perror("fork");
- exit(1);
- default:
- exit(0);
- }
-#endif
-
- /* receive loop */
- addr_len = sizeof their_addr;
- while ((numbytes = recvfrom(fd, buf, MAXBUFLEN-1 , 0,
- (struct sockaddr *) &their_addr, &addr_len)) != -1) {
- /* decode packet & launch handler */
- buf[numbytes] = '\0';
- char *task = buf,
- *cl_argv[2] = {task, NULL};
- if (task[0] == '/' || strstr(task, "..")) {
- fprintf(stderr, "payload tried directory traversal\n");
- continue;
- }
-
- int fd_payload[2];
- ENP(pipe(fd_payload), "pipe");
-
- switch (fork()) {
- case 0:
- /* redirect payload to stdio, leave stdout/err, close the rest */
- ENP(dup2(fd_payload[0], 0), "dup");
- ENP(close(fd_payload[0]), "close");
- ENP(close(fd_payload[1]), "close");
- ENP(close(fd), "close");
-
- /* run our task task */
- execve(task, cl_argv, envp);
- perror("exec");
- exit(1);
- case -1:
- perror("fork");
- exit(1);
- }
-
- /* write payload to child process; the return value of write is
- intentionally ignored */
- int tasklen = strlen(task);
- if (tasklen < numbytes)
- write(fd_payload[1], buf + tasklen + 1, numbytes - tasklen - 1);
- ENP(close(fd_payload[1]), "close");
- ENP(close(fd_payload[0]), "close");
- ENP(wait(NULL), "wait");
- }
-
- perror("recvfrom");
- return 1;
-}
contact: Jan Huwald // Impressum