first commit

Makefile

@@ -0,0 +1,5 @@
+nsa : nsa.c
+	gcc -std=c99 -Wall -ggdb -Wextra -pedantic -o nsa nsa.c
+
+clean:
+	rm -f nsa

README.md

@@ -0,0 +1,4 @@
+NSA - Another network installation tool for sending CIA files to FBI on the 3DS.
+
+Run with:
+    nsa ip file1 [file2 file3...]

nsa.c

@@ -0,0 +1,126 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+/// Prints usage message
+void usage(char* filename) {
+    printf("\tNSA - yet another CIA network installer for FBI 2.0 or greater.\n"
+           "\tUsage: %s ip-address 1st.cia [2nd.cia 3rd.cia ...]\n", filename);
+    exit(0);
+}
+
+int main(int argc, char* argv[]) {
+
+    // Print usage message if too few args are given.
+    if(argc < 3)
+        usage(argv[0]);
+
+    // Check the files first.
+    // Keep each file name with its size, which we'll need when sending the
+    // file.
+    struct file_w_size {
+        char * file;
+        unsigned long int size;
+    };
+
+    struct file_w_size filelist[argc-2];
+
+    for( int i=2; i<argc; i++) {
+        // Check that the file is readable
+        if(access(argv[i], R_OK) == -1) {
+            fprintf(stderr, "Cannot read file %s\n", argv[i]);
+            return EXIT_FAILURE;
+        }
+
+        // Get the size and store it
+        struct stat st;
+        stat(argv[i], &st);
+
+        filelist[i-2].size = st.st_size;
+        filelist[i-2].file = argv[i];
+
+    }
+
+    // Create a TCP/IP socket
+    int sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+    if(sock == -1) {
+        fprintf(stderr, "Failed to create socket\n");
+        return EXIT_FAILURE;
+    }
+
+    // Parse the 3DS's IP address as an unsigned long
+    struct sockaddr_in serv_addr;
+
+    if( inet_pton(AF_INET, argv[1], &serv_addr.sin_addr.s_addr) != 1) {
+        fprintf(stderr, "Invalid IP\n");
+        return EXIT_FAILURE;
+    }
+
+    // Set the rest of sockaddr_in
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(5000); // Port 5000
+    memset(serv_addr.sin_zero, 0, sizeof(serv_addr.sin_zero));
+
+    // Connect to the 3DS
+    if(connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr))) {
+        fprintf(stderr, "Failed to connect to socket\n");
+        return EXIT_FAILURE;
+    }
+
+
+    // FBI first accepts the # of files being sent as a big endian uint
+
+    unsigned int numfiles = argc-2;
+
+    printf("Telling FBI we have %u files to send...\n", numfiles);
+
+    // Swap to big endian
+    numfiles = htonl(numfiles);
+
+    send(sock, &numfiles, sizeof(unsigned int), 0);
+
+    // Send each file
+
+    // Allocate a 16MB buffer to hold what's read of the file
+    char * buf = malloc(16000000 * sizeof(char));
+
+    for(int i=0; i< argc-2; i++) {
+
+        // Recieve 1 byte ACK from FBI
+        recv(sock, NULL, 1, 0);
+
+        // Send the file size as a big endian ulong int
+        printf("DEBUG:: size before %lx", filelist[i].size);
+
+        filelist[i].size = (filelist[i].size & 0x00000000FFFFFFFF) << 32 | (filelist[i].size & 0xFFFFFFFF00000000) >> 32;
+        filelist[i].size = (filelist[i].size & 0x0000FFFF0000FFFF) << 16 | (filelist[i].size & 0xFFFF0000FFFF0000) >> 16;
+        filelist[i].size = (filelist[i].size & 0x00FF00FF00FF00FF) << 8  | (filelist[i].size & 0xFF00FF00FF00FF00) >> 8;
+
+        printf("Sending size of %s...\n", filelist[i].file);
+        send(sock, &filelist[i].size, sizeof(unsigned long int), 0);
+
+        // Open and send the file
+        printf("Sending %s...\n", filelist[i].file);
+        FILE *fp = fopen(filelist[i].file, "r");
+
+        size_t bytes_read;
+        do {
+            bytes_read = fread(buf, 1, 16000000, fp);
+            send(sock, buf, bytes_read, 0);
+        }while(bytes_read);
+
+        printf("Sent %s!\n", filelist[i].file);
+        fclose(fp);
+    }
+
+    free(buf);
+
+    close(sock);
+    return EXIT_SUCCESS;
+}
+