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#include "common.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <sys/select.h>
#include <errno.h>
#define MAXSTRLEN (1024)
static void
common_Log(FILE *pLog, const char *csFmtStr, va_list va_args);
static void
common_DoExit(int iExitCode);
static void
common_SigpipeHandle(int x);
/*function to wait for a specific FILE to be ready for reading*/
ERROR_STATUS
COMMON_ReadWaitFile(FILE *phF)
{
int iFDNum=fileno(phF);
return COMMON_ReadWaitFD(iFDNum);
}
/*function to wait for a specific File Descriptor (file, socket, pipe) to be ready for reading*/
ERROR_STATUS
COMMON_ReadWaitFD(int iFD)
{
int iStatus;
fd_set fds_r,fds_w,fds_ex;
FD_ZERO(&fds_r);
FD_ZERO(&fds_w);
FD_ZERO(&fds_ex);
FD_SET(iFD,&fds_r);
iStatus=select(iFD+1,&fds_r,&fds_w,&fds_ex,NULL);
if(iStatus>0) {
/*more one file ready (i.e. should only be one)*/
iStatus=SUCCESS;
} else {
/*something gone wrond or we are interrupted*/
iStatus=ERROR_INTERRUPT;
}
return iStatus;
}
// Function to read a proxy list from file and populate array of proxies
// Each proxy should be a separate line containing the url only
// e.g.:
//127.0.0.1:8423
//127.0.0.1:8424
//127.0.0.1:4433
ERROR_STATUS
COMMON_ReadProxyListFile(SSL *ptSSL,
const char *sFilename){
FILE *phF; // pointer to file
unsigned int uiCount = 0; // simple counters
char acLine [128]; // maximum size of line to read from
SPP_PROXY *patNewProxiesList=NULL;
if(ptSSL==NULL || sFilename==NULL) {
return INVALID_POINTER;
}
// Open file for reading
phF = fopen(sFilename,"r");
// Check for errors while opening file
if( phF == NULL ){
return FILE_NOT_READABLE;
}
uiCount=0;
// Read file line-by-line
while ( fgets ( acLine, sizeof(acLine), phF ) != NULL ) {
// Remove trailing newline (NOTE: strtoK is not thread safe)
strtok(acLine, "\n");
if(strlen(acLine)<=2) continue; //ignore blank lines
COMMON_AppendProxy(ptSSL,acLine);
/*TODO - log the proxy creation properly*/
COMMON_Log(stdout,"Proxy(%2u): %s\n",uiCount,acLine);
}
// Close file
fclose(phF);
return SUCCESS;
}
ERROR_STATUS
COMMON_InitProxySet(SSL *ptSSL)
{
while(ptSSL->proxies_len>0) {
ptSSL->proxies_len--;
OPENSSL_free(ptSSL->proxies[ptSSL->proxies_len]);
}
ptSSL->proxies_len=0;
memset(ptSSL->proxies,0,sizeof(ptSSL->proxies));
return SUCCESS;
}
ERROR_STATUS
COMMON_InitMulticontextSet(SSL *ptSSL)
{
while(ptSSL->slices_len>0) {
ptSSL->slices_len--;
OPENSSL_free(ptSSL->slices[ptSSL->slices_len]);
}
ptSSL->slices_len=0;
memset(ptSSL->slices,0,sizeof(ptSSL->slices));
return SUCCESS;
}
ERROR_STATUS
COMMON_AppendProxy(SSL *ptSSL,
const char *psProxyURL)
{
char *psProxyUrlCpy=NULL;
if(ptSSL->proxies_len>=(sizeof(ptSSL->proxies)/sizeof(ptSSL->proxies[0])))
return ARRAY_OVERFLOW;
/*SPP_generate_proxy will generate something with the string provide
* but there is no guarantee that it will be sensible if
* invalid data is passed in*/
psProxyUrlCpy=strdup(psProxyURL);
ptSSL->proxies[ptSSL->proxies_len] = SPP_generate_proxy(ptSSL, psProxyUrlCpy);
(ptSSL->proxies_len)++;
return SUCCESS;
}
ERROR_STATUS
{
char *psUrlCpy=NULL;
psUrlCpy=strdup(psURL);
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return SUCCESS;
}
ERROR_STATUS
COMMON_AppendContext(SSL *ptSSL,
const char *psContextDesc)
{
char *psContextDescCpy=NULL;
if(ptSSL->slices_len>=(sizeof(ptSSL->slices)/sizeof(ptSSL->slices[0])))
return ARRAY_OVERFLOW;
psContextDescCpy=strdup(psContextDesc);
ptSSL->slices[ptSSL->slices_len] = SPP_generate_slice(ptSSL, psContextDescCpy);
ptSSL->slices_len++;
return SUCCESS;
}
ERROR_STATUS
COMMON_SetProxyAccessPermissionByID(SSL *ptSSL, int iSliceID, int iMiddleboxNum,
int bGrantRead, int bGrantWrite)
{
int *read_slices; size_t *read_slice_len;
int *write_slices; size_t *write_slice_len;
int reads_insert_index, write_insert_index;
int x,y,z;
if(ptSSL->proxies_len<iMiddleboxNum || ptSSL->slices_len<iSliceID)
return ARRAY_OVERFLOW;
read_slices=ptSSL->proxies[iMiddleboxNum]->read_slice_ids;
read_slice_len=&(ptSSL->proxies[iMiddleboxNum]->read_slice_ids_len);
write_slices=ptSSL->proxies[iMiddleboxNum]->write_slice_ids;
write_slice_len=&(ptSSL->proxies[iMiddleboxNum]->write_slice_ids_len);
/*handle empty case specially*/
if(*read_slice_len==0 && bGrantRead) {
read_slices[0]=iSliceID;
(*read_slice_len)++;
}
if(*write_slice_len==0 && bGrantWrite) {
write_slices[0]=iSliceID;
(*write_slice_len)++;
}
/*if we have just inserted the first record, this loop will
* terminate on first iteration*/
x=0;y=*read_slice_len;
while(y>x+1) {
z=(x+y)/2;
if(read_slices[z]>iSliceID) y=z;
else x=z;
}
if(bGrantRead) {
if(read_slices[x]!=iSliceID) {
if(*read_slice_len>y) { /*we have higher number slices to move up*/
memmove(&read_slices[x+1],&read_slices[x],(*read_slice_len-y)*sizeof(*read_slices));
}
read_slices[x]=iSliceID;
(*read_slice_len)++;
} /*else we are re-granted an already granted access - NOP*/
} else { /*we are removing the permission if it is granted*/
if(read_slices[x]==iSliceID) {
if(*read_slice_len>y) { /*we have higher number slices to move up*/
memmove(&read_slices[x],&read_slices[x+1],(*read_slice_len-y)*sizeof(*read_slices));
}
(*read_slice_len)--;
} /*else we removing a non-existent permission - NOP*/
}
x=0;y=*write_slice_len;
while(y>x+1) {
z=(x+y)/2;
if(write_slices[z]>iSliceID) y=z;
else x=z;
}
if(bGrantWrite) {
if(write_slices[x]!=iSliceID) {
if(*write_slice_len>y) { /*we have higher number slices to move up*/
memmove(&write_slices[x+1],&write_slices[x],(*write_slice_len-y)*sizeof(*write_slices));
}
write_slices[x]=iSliceID;
(*write_slice_len)++;
} /*else we are re-granted an already granted access - NOP*/
} else { /*we are removing the permission if it is granted*/
if(write_slices[x]==iSliceID) {
if(*write_slice_len>y) { /*we have higher number slices to move up*/
memmove(&write_slices[x],&write_slices[x+1],(*write_slice_len-y)*sizeof(*write_slices));
}
(*write_slice_len)--;
} /*else we removing a non-existent permission - NOP*/
}
return SUCCESS;
}
ERROR_STATUS
COMMON_TcpConnect(int *piSocket, const char *sHost, int iPort){
struct hostent *hp;
struct sockaddr_in addr;
int iOne=1;
// Resolve host
if(!(hp = gethostbyname(sHost)))
return NETWORK_CONNECT_FAIL;
memset(&addr, 0, sizeof(addr));
addr.sin_addr = *(struct in_addr*)
hp->h_addr_list[0];
addr.sin_family = AF_INET;
addr.sin_port = htons(iPort);
if((*piSocket=socket(AF_INET,SOCK_STREAM, IPPROTO_TCP))<0){
return NETWORK_CONNECT_FAIL;
}
/*I'm copying this option below*/
//set_nagle(*piSocket, 1);
setsockopt(*piSocket, IPPROTO_TCP, TCP_NODELAY, (char*)&iOne, sizeof(int));
if(connect(*piSocket,(struct sockaddr *)&addr, sizeof(addr))<0){
return NETWORK_CONNECT_FAIL;
}
return SUCCESS;
}
void
COMMON_LogErrorAndExit(int iExitCode, FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
common_DoExit(iExitCode);
}
void
COMMON_CheckLogErrorAndExit(int iExitCode, FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
if(iExitCode!=0) {
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
common_DoExit(iExitCode);
}
}
void
COMMON_Log(FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
}
void
COMMON_CheckLog(int iExitCode, FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
if(iExitCode!=0) {
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
}
}
char *gsPassword=NULL;
static int
password_cb(char *buf,int num, int rwflag,void *userdata)
{
if(gsPassword==NULL)
return 0;
if(num<strlen(gsPassword)+1)
return(0);
strcpy(buf,gsPassword);
return(strlen(gsPassword));
}
ERROR_STATUS
COMMON_InitializeSSLCtx(SSL_CTX **pptCtx,
const char *sMyKeyfile, const char *sMyPassword,
const char *sCAKeysFile,
unsigned int iID) /*todo - check the name of this in spec - the byte that identifies the middlebox number, client or server*/
{
const SSL_METHOD *meth;
SSL_CTX *ctx;
/* Global system initialization*/
SSL_library_init();
SSL_load_error_strings();
/* Set up a SIGPIPE handler */
signal(SIGPIPE,common_SigpipeHandle);
if(iID==ID_CLIENT || iID==ID_SERVER) {
meth = SPP_method();
} else if(iID >=ID_MIDDLEBOX_MIN && iID<=ID_MIDDLEBOX_MAX) {
meth = SPP_proxy_method();
} else {
return INTEGER_OUT_OF_RANGE;
}
ctx = SSL_CTX_new(meth);
/* Specify the cipher suites that may be used. */
if (!SSL_CTX_set_cipher_list(ctx, "DHE-RSA-AES128-SHA256")) {
return ERROR_IN_LIBRARY_CALL;
}
/* Load the CAs*/
if(!(SSL_CTX_load_verify_locations(ctx,
sCAKeysFile,NULL)))
return FILE_NOT_READABLE;
/* Load our certificate*/
if(!(SSL_CTX_use_certificate_chain_file(ctx,
sMyKeyfile)))
return FILE_NOT_READABLE;
/*set the routine to handle passing in the passowrd for our private key*/
if(gsPassword!=NULL) {
free(gsPassword); gsPassword=NULL;
}
if(sMyPassword!=NULL){
gsPassword=strdup(sMyPassword);
}
SSL_CTX_set_default_passwd_cb(ctx,
password_cb);
/*load our private key*/
if(!(SSL_CTX_use_PrivateKey_file(ctx,
sMyKeyfile,SSL_FILETYPE_PEM)))
return FILE_NOT_READABLE;
*pptCtx=ctx;
return SUCCESS;
}
void
COMMON_DestroyCtx(SSL_CTX *ptCtx)
{
if(gsPassword!=NULL) {
free(gsPassword); gsPassword=NULL;
SSL_CTX_free(ptCtx);
}
}
static void
common_Log(FILE *pLog, const char *csFmtStr, va_list va_args)
{
assert(pLog!=NULL);
assert(csFmtStr!=NULL);
assert(strnlen(csFmtStr,MAXSTRLEN)<MAXSTRLEN);
vfprintf(pLog,csFmtStr,va_args);
fflush(pLog);
}
static void
common_DoExit(int iExitCode)
{
exit(iExitCode);
}
static void
common_SigpipeHandle(int x)
{
UNUSED(x);
}