/*
* netconf_create_hello
* create capability string (once)
*/
int
netconf_create_hello(cbuf *xf, /* msg buffer */
int session_id)
{
int retval = 0;
add_preamble(xf);
cprintf(xf, "<hello>");
cprintf(xf, "<capabilities>");
cprintf(xf, "<capability>urn:ietf:params:xml:ns:netconf:base:1.0</capability>\n");
cprintf(xf, "<capability>urn:ietf:params:xml:ns:netconf:capability:candidate:1:0</capability>\n");
cprintf(xf, "<capability>urn:ietf:params:xml:ns:netconf:capability:validate:1.0</capability>\n");
cprintf(xf, "<capability>urn:ietf:params:netconf:capability:xpath:1.0</capability>\n");
cprintf(xf, "<capability>urn:ietf:params:netconf:capability:notification:1.0</capability>\n");
// cprintf(xf, "<capability>urn:rnr:rnrapi:1:0</capability>");
cprintf(xf, "</capabilities>");
cprintf(xf, "<session-id>%lu</session-id>", 42+session_id);
cprintf(xf, "</hello>");
add_postamble(xf);
return retval;
}
static int read_write_file(struct filename *f1name, struct filename *f2name, unsigned char *key, int flag)
{
struct file *fp1 =NULL;
struct file *fp2 =NULL;
struct file *fp_temp = NULL;
int rbytes, wbytes;
char *buf = NULL;
int keylen =16;
int rc;
int flag_outfile, flag_delete_temp;
mm_segment_t fs;
flag_outfile =0;
flag_delete_temp =0;
fp1 = filp_open(f1name->name,O_RDONLY,0);
putname(f1name);
if(!fp1)
{
printk("Error opening input file \n");
rc = -ENOENT;
return rc;
}
if(IS_ERR(fp1))
{
printk("Error opening input file \n");
rc = -ENOENT;
return rc;
}
rc = is_regular_file(fp1);
if(rc){
printk("Input file is not regular \n");
rc = -EISDIR;
goto out;
}
if(!fp1->f_op){
printk("Permission Denied \n");
rc = -EPERM;
goto out;
}
if(!fp1->f_op->read){
printk("Read operation not permitted \n");
rc = -EPERM;
goto out;
}
flag_outfile = is_file_exists(f2name->name);
if(flag_outfile)
fp2 = filp_open(f2name->name,O_WRONLY ,fp1->f_mode);
else
fp2 = filp_open(f2name->name,O_CREAT | O_WRONLY ,fp1->f_mode);
fp_temp = filp_open(strcat((char *)f2name->name,".tmp"),O_CREAT | O_WRONLY,fp1->f_mode);
putname(f2name);
if(!fp2 || !fp_temp){
printk("Error opening write file\n");
rc= -ENOENT;
return rc;
}
if(IS_ERR(fp2) || IS_ERR(fp_temp)){
printk("Error opening write file\n");
rc= -ENOENT;
return rc;
}
if(!fp2->f_op || !fp2->f_op){
printk("Permission Denied \n");
rc = -EPERM;
goto out;
}
if(!fp2->f_op->write || !fp2->f_op->write){
printk("Write operation not permitted \n");
rc = -EPERM;
goto out;
}
rc = is_same_file(fp1,fp2);
if(rc){
printk("Input and output files are same \n");
rc = -EINVAL;
goto out;
}
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if(IS_ERR(buf)){
printk("Error while allocationg temporary buffer for reading and writing \n");
rc = -PTR_ERR(key);
goto out;
}
/* Add info about key in preamble during encryption */
if(flag == 1)
{
rc=add_preamble(fp_temp,key,keylen);
if(rc< 0){
printk("Error adding preamble to the outfile\n");
goto out;
}
}
/* Verify hashed key stored in preamble during decryption */
if(flag == 0)
{
rc=verify_preamble(fp1,key,keylen);
if(rc<0){
printk("Error verifying preamble in the encrypted file\n");
goto out;
}
}
/* read and write actual data */
while(1){
fs=get_fs();
set_fs(get_ds());
rbytes = fp1->f_op->read(fp1,buf,PAGE_SIZE,&fp1->f_pos);
if(rbytes < 0){
printk("Failed reading input file\n");
set_fs(fs);
rc= -EIO;
goto out;
}
if (rbytes == 0){
printk("Reached end of file while reading \n");
rc= 0;
goto out_rename;
}
/* If flag is set as 1, input file is encrypted */
if(flag == 1){
rc=encrypt_decrypt_file(buf,key,rbytes,flag);
if(rc < 0){
printk("Encrypt failure\n");
goto out;
}
}
/* If flag is set as 0, input file is decrypted */
else if(flag == 0){
rc=encrypt_decrypt_file(buf,key,rbytes,flag);
if(rc < 0){
printk("Decrypt failure \n");
goto out;
}
}
wbytes = fp_temp->f_op->write(fp_temp,buf,rbytes,&fp_temp->f_pos);
if(wbytes < 0){
printk("Failed writing output file\n");
set_fs(fs);
rc= -EIO;
goto out;
}
set_fs(fs);
}
out_rename:
flag_delete_temp=1;
rc = rename_temp_file(fp_temp,fp2);
if(rc)
printk("Rename operation failed \n");
out:
if(flag_delete_temp==0){
if(rc<0){
if(delete_partial_file(fp_temp))
printk("Deleting partial temp file failed \n");
}
}
printk("flag_outfile = %d \n",flag_outfile);
if(flag_outfile==0){
if(rc < 0){
if(delete_partial_file(fp2))
printk("Deleting out file failed\n");
}
}
if(fp_temp)
filp_close(fp_temp,NULL);
if(buf)
kfree(buf);
if(fp2)
filp_close(fp2,NULL);
if(fp1)
filp_close(fp1,NULL);
if(IS_ERR(f2name))
putname(f2name);
if(IS_ERR(f1name))
putname(f1name);
return rc;
}
