void
script_process(char* script)
{
// Split script in independent pipelines
char* array[10];
int numPipelines = gettokens(script, array, 10, ";");
// run script commands
int i;
for(i = 0; i < numPipelines; ++i)
{
// expand environment variables and substitute command line char pointer
// with the one with expanded environment variables (if necesary)
// char* expanded = expand_envVars(array[i]);
// if(expanded) array[i] = expanded;
array[i] = environment_expand(array[i]);
// move commands to background (if necesary)
background(array[i]);
// Exec `cd` (it's a built-in, but must change shell environment itself,
// so we check and exec for it directly here)
if(builtin_cd(array[i]))
{
free(array[i]);
continue;
}
// Set environment variable
if(environment_set(array[i]))
{
free(array[i]);
continue;
}
// run foreground command
pipeline_process(array[i]);
// free line created by environment variables expansion
free(array[i]);
}
}
int
background(char* line)
// Check and exec on background all the commands ended with '&' on the command
// line and return the last, foreground command
{
// Split pipeline in independent commands
char* array[10];
int numCommands = gettokens(line, array, 10, "&");
// run script commands
int i;
for(i = 0; i < numCommands-1; ++i)
{
switch(fork())
{
case -1:
return -1;
case 0: // child
{
// redirect stdin to /dev/null
redirect_stdin("/dev/null");
// process pipeline
pipeline_process(array[i]);
exitError();
}
// parent loop to exec in background the next command (if any)
}
}
// collapse line to let only the last (not background) command on it
int len = strlen(array[numCommands-1]);
memmove(line, array[numCommands-1], len);
*(line+len) = '\0';
return 0;
}
static void
ind_ovs_handle_packet_miss(struct ind_ovs_upcall_thread *thread,
struct ind_ovs_port *port,
struct nl_msg *msg, struct nlattr **attrs)
{
struct nlmsghdr *nlh = nlmsg_hdr(msg);
struct genlmsghdr *gnlh = (void *)(nlh + 1);
struct nlattr *key = attrs[OVS_PACKET_ATTR_KEY];
struct nlattr *packet = attrs[OVS_PACKET_ATTR_PACKET];
assert(key && packet);
struct ind_ovs_parsed_key pkey;
ind_ovs_parse_key(key, &pkey);
struct pipeline_result *result = &thread->result;
pipeline_result_reset(result);
indigo_error_t err = pipeline_process(&pkey, result);
if (err < 0) {
return;
}
struct ind_ovs_flow_stats **stats_ptrs = xbuf_data(&result->stats);
int num_stats_ptrs = xbuf_length(&result->stats) / sizeof(void *);
int i;
for (i = 0; i < num_stats_ptrs; i++) {
struct ind_ovs_flow_stats *stats = stats_ptrs[i];
__sync_fetch_and_add(&stats->packets, 1);
__sync_fetch_and_add(&stats->bytes, nla_len(packet));
}
/* Check for a single controller action */
{
uint32_t actions_length = xbuf_length(&result->actions);
struct nlattr *first_action = xbuf_data(&result->actions);
if (actions_length >= NLA_HDRLEN &&
actions_length == NLA_ALIGN(first_action->nla_len) &&
first_action->nla_type == IND_OVS_ACTION_CONTROLLER) {
/*
* The only action is sending the packet to the controller.
* It's wasteful to send it all the way through the kernel
* to be received as another upcall, so request a pktin
* directly here.
*/
uint64_t userdata = *XBUF_PAYLOAD(first_action, uint64_t);
ind_ovs_upcall_request_pktin(pkey.in_port, port, packet, key,
IVS_PKTIN_REASON(userdata),
IVS_PKTIN_METADATA(userdata));
return;
}
}
/* Reuse the incoming message for the packet execute */
gnlh->cmd = OVS_PACKET_CMD_EXECUTE;
struct nlattr *actions = nla_nest_start(msg, OVS_PACKET_ATTR_ACTIONS);
ind_ovs_translate_actions(&pkey, &result->actions, msg);
ind_ovs_nla_nest_end(msg, actions);
/* Don't send the packet back out if it would be dropped. */
if (nla_len(actions) > 0) {
nlh->nlmsg_pid = 0;
nlh->nlmsg_seq = 0;
nlh->nlmsg_flags = NLM_F_REQUEST;
struct iovec *iovec = &thread->tx_queue[thread->tx_queue_len++];
iovec->iov_base = nlh;
iovec->iov_len = nlh->nlmsg_len;
if (thread->log_upcalls) {
LOG_VERBOSE("Sending upcall reply:");
ind_ovs_dump_msg(nlh);
}
}
/* See the comment for ind_ovs_upcall_seen_key. */
if (!ind_ovs_disable_kflows && ind_ovs_upcall_seen_key(thread, key)) {
/* Create a kflow with the given key and actions. */
ind_ovs_bh_request_kflow(key);
}
}