Check for empty source or destination list.

[jam] / jam.c

diff --git a/jam.c b/jam.c
index d22ced453ff2c4769b9a558f895c54c59d799960..f6c30075a19c451f71abf7ffb35b770bd97cf637 100644 (file)
--- a/jam.c
+++ b/jam.c
@@ -1,13 +1,132 @@
 #include <stdio.h>
+#include <string.h>
 #include <stdlib.h>
+#include <getopt.h>
+#include <netdb.h>
+#include <unistd.h>
 #include <pthread.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 
+unsigned short port = 2007;
+
+struct in_addr *destinations = NULL;
+unsigned num_destinations = 0;
+unsigned room_destinations = 0;
+
+struct in_addr *sources = NULL;
+unsigned num_sources = 0;
+unsigned room_sources = 0;
+
+const static struct option longopts[] = {
+       { "source-file", required_argument, NULL, 's' },
+       { "destination-file", required_argument, NULL, 'd' },
+       { "port", required_argument, NULL, 'p' },
+       { NULL, 0, NULL, 0 }
+};
+
+void read_ip_list(char *filename, struct in_addr **addr_list, unsigned *num, unsigned *room)
+{
+       char buf[256];
+       FILE *in = fopen(filename, "r");
+       if (in == NULL) {
+               perror(filename);
+               exit(1);
+       }
+
+       for ( ;; ) {
+               char *ptr;
+               struct in_addr addr;
+               struct hostent *he;
+
+               if (fgets(buf, 256, in) == NULL)
+                       break;
+
+               ptr = strchr(buf, '\n');
+               if (ptr != NULL)
+                       *ptr = 0;
+
+               ptr = strchr(buf, '\r');
+               if (ptr != NULL)
+                       *ptr = 0;
+               
+               ptr = buf + strspn(buf, " \t");
+
+               if (ptr[0] == '#' || ptr[0] == 0)
+                       continue;
+
+               he = gethostbyname(ptr);
+               if (he == NULL) {
+                       perror(ptr);
+                       exit(1);
+               }
+
+               // just pick the first for now
+               memcpy(&addr.s_addr, he->h_addr_list[0], sizeof(addr.s_addr));
+
+               if (*num >= *room) {
+                       if (*room == 0) {
+                               *room = 16;
+                       } else {
+                               *room <<= 1;
+                       }
+                       *addr_list = (struct in_addr *)realloc(*addr_list, *room * sizeof(struct in_addr));
+               }
+
+               (*addr_list)[*num] = addr;
+               ++*num;
+       }
+
+       fclose(in);
+}
+
+void parse_options(int argc, char **argv)
+{
+       int option_index = 0;
+
+       for ( ;; ) {
+               int c = getopt_long(argc, argv, "s:d:p:", longopts, &option_index); 
+               switch (c) {
+               case 's':
+                       read_ip_list(optarg, &sources, &num_sources, &room_sources);
+                       break;
+               case 'd':
+                       read_ip_list(optarg, &destinations, &num_destinations, &room_destinations);
+                       break;
+               case 'p':
+                       port = atoi(optarg);
+                       break;
+               case -1:
+                       return;       // end of argument list
+               default:
+                       fprintf(stderr, "Invalid option\n");
+                       exit(1);
+               }
+       }
+}
+
 void *receiver_worker(void *arg)
 {
        int sock = (int)arg;
+       char buf[65536];
+
        printf("Received worker for socket %u\n", sock);
+
+       for ( ;; ) {
+               int ret = read(sock, buf, 65536);
+               if (ret == 0)
+                       break;
+
+               // FIXME: update stats here
+       }
+
+       printf("Socket %u done\n", sock);
+       
+       if (close(sock) == -1) {
+               perror("close()");
+               exit(1);
+       }
+
        pthread_exit(0);
 }
 
@@ -15,6 +134,7 @@ int get_server_socket(unsigned short port)
 {
        int server_sock;
        struct sockaddr_in sin;
+       unsigned one = 1;
 
        server_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
        if (server_sock == -1) {
@@ -22,6 +142,11 @@ int get_server_socket(unsigned short port)
                exit(1);
        }
 
+       if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
+               perror("setsocket(SO_REUSEADDR)");
+               exit(1);
+       }
+
        sin.sin_family = AF_INET;
        sin.sin_port = htons(port);
        sin.sin_addr.s_addr = INADDR_ANY;
@@ -39,9 +164,17 @@ int get_server_socket(unsigned short port)
        return server_sock;
 }
 
-int main()
+int main(int argc, char **argv)
 {
-       int server_sock = get_server_socket(2007);
+       int server_sock;
+
+       parse_options(argc, argv);
+
+       if (destinations == NULL || sources == NULL) {
+               fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
+       }
+
+       server_sock = get_server_socket(port);
 
        // FIXME: fire off sender workers here
 
@@ -54,6 +187,7 @@ int main()
                struct sockaddr_in addr;
                socklen_t addr_len = sizeof(addr);
                pthread_t thread;
+               pthread_attr_t attr;
 
                int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
                if (sock == -1) {
@@ -61,7 +195,21 @@ int main()
                        exit(1);
                }
 
-               pthread_create(&thread, NULL, receiver_worker, (void *)sock);
+               // FIXME: these do not really set errno
+               if (pthread_attr_init(&attr) != 0) {
+                       perror("pthread_attr_init()");
+                       exit(1);
+               }
+
+               if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
+                       perror("pthread_attr_setstacksize");
+                       exit(1);
+               }
+
+               if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) {
+                       perror("pthread_create()");
+                       exit(1);
+               }
        }
 
        exit(0);