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Bring in basecode from development repo.

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This commit is contained in:
Gene Stark 2022-04-16 17:19:19 -04:00
commit 45eb0feb78
18 changed files with 1668 additions and 0 deletions
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7
.gitignore vendored Normal file
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*~
#*
*.d
*.o
*.out
bin/*
build/*

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image: hwrunner:latest
variables:
GIT_SSL_NO_VERIFY: "true"
EXEC: pbx
HW_DIR: hw5
CPU_LIMIT: 60
FILE_LIMIT: 1000000
before_script:
- make clean all -C ${HW_DIR}
stages:
- build
- run
- test
build:
stage: build
script:
- echo "Build done"
run:
stage: run
script:
- ulimit -t ${CPU_LIMIT}
- ulimit -f ${FILE_LIMIT}
- cd ${HW_DIR} && bin/${EXEC}
test:
stage: test
script:
- ulimit -t ${CPU_LIMIT}
- ulimit -f ${FILE_LIMIT}
- cd ${HW_DIR} && bin/${EXEC}_tests -S --verbose=0 -j1 --timeout 50

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CC := gcc
SRCD := src
TSTD := tests
BLDD := build
BIND := bin
INCD := include
LIBD := lib
UTILD := util
MAIN := $(BLDD)/main.o
LIB := $(LIBD)/pbx.a
LIB_DB := $(LIBD)/pbx.a
ALL_SRCF := $(shell find $(SRCD) -type f -name *.c)
ALL_OBJF := $(patsubst $(SRCD)/%,$(BLDD)/%,$(ALL_SRCF:.c=.o))
ALL_FUNCF := $(filter-out $(MAIN), $(ALL_OBJF))
TEST_SRC := $(shell find $(TSTD) -type f -name *.c)
INC := -I $(INCD)
CFLAGS := -Wall -Werror -Wno-unused-function -Wno-error=switch -MMD
DFLAGS := -g -DDEBUG -DCOLOR
PRINT_STAMENTS := -DERROR -DSUCCESS -DWARN -DINFO
STD := -std=gnu11
TEST_LIB := -lcriterion
LIBS := $(LIB) -lpthread
LIBS_DB := $(LIB_DB) -lpthread
EXCLUDES := excludes.h
CFLAGS += $(STD) -DTEST_CONFIG_C
EXEC := pbx
TEST_EXEC := $(EXEC)_tests
.PHONY: clean all setup debug
all: setup $(BIND)/$(EXEC) $(INCD)/$(EXCLUDES) $(BIND)/$(TEST_EXEC)
debug: CFLAGS += $(DFLAGS) $(PRINT_STAMENTS)
debug: all
tester: $(UTILD)/tester
setup: $(BIND) $(BLDD)
$(BIND):
mkdir -p $(BIND)
$(BLDD):
mkdir -p $(BLDD)
$(UTILD)/tester: $(UTILD)/tester.c src/globals.c
$(CC) $(DFLAGS) $(INC) $^ -o $@
$(BIND)/$(EXEC): $(MAIN) $(ALL_FUNCF)
$(CC) $^ -o $@ $(LIBS)
$(BIND)/$(TEST_EXEC): $(ALL_FUNCF) $(TEST_SRC)
$(CC) $(CFLAGS) $(INC) $(ALL_FUNCF) $(TEST_SRC) $(TEST_LIB) $(LIBS) -o $@
$(BLDD)/%.o: $(SRCD)/%.c
$(CC) $(CFLAGS) $(INC) -c -o $@ $<
clean:
rm -rf $(BLDD) $(BIND)
$(INCD)/$(EXCLUDES): $(BIND)/$(EXEC)
rm -f $@
touch $@
if nm $(BIND)/$(EXEC) | grep INSTRUCTOR_MAIN > /dev/null; then \
echo "#define NO_MAIN" >> $@; \
fi
if nm $(BIND)/$(EXEC) | grep INSTRUCTOR_SERVER > /dev/null; then \
echo "#define NO_SERVER" >> $@; \
fi
if nm $(BIND)/$(EXEC) | grep INSTRUCTOR_PBX > /dev/null; then \
echo "#define NO_PBX" >> $@; \
fi
.PRECIOUS: $(BLDD)/*.d
-include $(BLDD)/*.d

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{
"folders":
[
{
"path":".",
"name":"Project Base"
},
{
"path": "src",
"name": "C Source",
"follow_symlinks": false,
"file_include_patterns":["*.c"],
},
{
"path": "include",
"name": "C Headers",
"follow_symlinks": false,
"file_include_patterns":["*.h"],
},
{
"path": "tests",
"name": "Tests",
}
],
"settings":
{
},
"build_systems":
[
{
"name": "Release (full build)",
"working_dir":"$project_path",
"shell_cmd": "make clean all",
},
{
"name": "Debug (full build)",
"working_dir":"$project_path",
"shell_cmd": "make clean debug",
},
{
"name": "Test",
"working_dir":"$project_path",
"shell_cmd": "bin/${project_base_name}_tests}",
}
]
}

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#ifndef DEBUG_H
#define DEBUG_H
#include <stdio.h>
#define NL "\n"
#ifdef COLOR
#define KNRM "\033[0m"
#define KRED "\033[1;31m"
#define KGRN "\033[1;32m"
#define KYEL "\033[1;33m"
#define KBLU "\033[1;34m"
#define KMAG "\033[1;35m"
#define KCYN "\033[1;36m"
#define KWHT "\033[1;37m"
#define KBWN "\033[0;33m"
#else
#define KNRM ""
#define KRED ""
#define KGRN ""
#define KYEL ""
#define KBLU ""
#define KMAG ""
#define KCYN ""
#define KWHT ""
#define KBWN ""
#endif
#ifdef VERBOSE
#define DEBUG
#define INFO
#define WARN
#define ERROR
#define SUCCESS
#endif
#ifdef DEBUG
#define debug(S, ...) \
do { \
fprintf(stderr, KMAG "DEBUG: %s:%s:%d " KNRM S NL, __FILE__, \
__extension__ __FUNCTION__, __LINE__, ##__VA_ARGS__); \
} while (0)
#else
#define debug(S, ...)
#endif
#ifdef INFO
#define info(S, ...) \
do { \
fprintf(stderr, KBLU "INFO: %s:%s:%d " KNRM S NL, __FILE__, \
__extension__ __FUNCTION__, __LINE__, ##__VA_ARGS__); \
} while (0)
#else
#define info(S, ...)
#endif
#ifdef WARN
#define warn(S, ...) \
do { \
fprintf(stderr, KYEL "WARN: %s:%s:%d " KNRM S NL, __FILE__, \
__extension__ __FUNCTION__, __LINE__, ##__VA_ARGS__); \
} while (0)
#else
#define warn(S, ...)
#endif
#ifdef SUCCESS
#define success(S, ...) \
do { \
fprintf(stderr, KGRN "SUCCESS: %s:%s:%d " KNRM S NL, __FILE__, \
__extension__ __FUNCTION__, __LINE__, ##__VA_ARGS__); \
} while (0)
#else
#define success(S, ...)
#endif
#ifdef ERROR
#define error(S, ...) \
do { \
fprintf(stderr, KRED "ERROR: %s:%s:%d " KNRM S NL, __FILE__, \
__extension__ __FUNCTION__, __LINE__, ##__VA_ARGS__); \
} while (0)
#else
#define error(S, ...)
#endif
#endif /* DEBUG_H */

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/**
* === DO NOT MODIFY THIS FILE ===
* If you need some other prototypes or constants in a header, please put them
* in another header file.
*
* When we grade, we will be replacing this file with our own copy.
* You have been warned.
* === DO NOT MODIFY THIS FILE ===
*/
#ifndef PBX_H
#define PBX_H
#include <unistd.h>
#include <sys/select.h>
#include "tu.h"
/*
* Structure types representing objects manipulated by the PBX module.
*
* PBX: Represents the current state of a private branch exchange.
* TU: Represents the current state of a telephone unit.
*
* NOTE: These types are "opaque": the actual structure definitions are not
* given here and it is not intended that a client of the PBX module should
* know what they are. The actual structure definitions are local to the
* implementation of the PBX module and are not exported.
*/
typedef struct pbx PBX;
/*
* Maximum number of extensions supported by a PBX.
*/
#define PBX_MAX_EXTENSIONS FD_SETSIZE
/*
* End-of-line sequence used in communication with client.
*/
#define EOL "\r\n"
/*
* Global variable that provides access to the PBX instance.
*/
extern PBX *pbx;
PBX *pbx_init();
void pbx_shutdown(PBX *pbx);
int pbx_register(PBX *pbx, TU *tu, int ext);
int pbx_unregister(PBX *pbx, TU *tu);
int pbx_dial(PBX *pbx, TU *tu, int ext);
#endif

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/**
* === DO NOT MODIFY THIS FILE ===
* If you need some other prototypes or constants in a header, please put them
* in another header file.
*
* When we grade, we will be replacing this file with our own copy.
* You have been warned.
* === DO NOT MODIFY THIS FILE ===
*/
#ifndef SERVER_H
#define SERVER_H
/*
* Definitions of the commands that can be issued by a client.
*/
typedef enum tu_command {
TU_PICKUP_CMD, TU_HANGUP_CMD, TU_DIAL_CMD, TU_CHAT_CMD,
// Below are special values used in grading tests.
TU_NO_CMD = 100, TU_CONNECT_CMD = 101, TU_DISCONNECT_CMD = 102,
TU_AWAIT_CMD = 103, TU_DELAY_CMD = 104, TU_EOF_CMD = 105
} TU_COMMAND;
/*
* Array that specifies a printable name for each of the commands that
* can be issued to a TU by a client. These names should be used when
* parsing commands received from a client. They may also be used for
* debugging purposes.
*/
extern char *tu_command_names[];
/*
* Thread function for the thread that handles a particular client.
*
* @param Pointer to a variable that holds the file descriptor for
* the client connection. This variable must be freed once the file
* descriptor has been retrieved.
* @return NULL
*
* This function executes a "service loop" that receives messages from
* the client and dispatches to appropriate functions to carry out
* the client's requests. The service loop ends when the network connection
* shuts down and EOF is seen. This could occur either as a result of the
* client explicitly closing the connection, a timeout in the network causing
* the connection to be closed, or the main thread of the server shutting
* down the connection as part of graceful termination.
*/
void *pbx_client_service(void *arg);
#endif

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/**
* === DO NOT MODIFY THIS FILE ===
* If you need some other prototypes or constants in a header, please put them
* in another header file.
*
* When we grade, we will be replacing this file with our own copy.
* You have been warned.
* === DO NOT MODIFY THIS FILE ===
*/
#ifndef TU_H
#define TU_H
/*
* Structure types representing objects manipulated by the TU module.
*
* TU: Represents the current state of a telephone unit.
*
* NOTE: These types are "opaque": the actual structure definitions are not
* given here and it is not intended that a client of the TU module should
* know what they are. The actual structure definitions are local to the
* implementation of the TU module and are not exported.
*/
typedef struct tu TU;
/*
* The possible states that a TU can be in.
*/
typedef enum tu_state {
TU_ON_HOOK, TU_RINGING, TU_DIAL_TONE, TU_RING_BACK, TU_BUSY_SIGNAL,
TU_CONNECTED, TU_ERROR
} TU_STATE;
/*
* Array that specifies a printable name for each of the TU states.
* These names should be used when sending state-change notifications to
* the underlying network clients. They may also be used for debugging
* purposes.
*/
extern char *tu_state_names[];
TU *tu_init(int fd);
void tu_ref(TU *tu, char *reason);
void tu_unref(TU *tu, char *reason);
int tu_fileno(TU *tu);
int tu_extension(TU *tu);
int tu_set_extension(TU *tu, int ext);
int tu_pickup(TU *tu);
int tu_hangup(TU *tu);
int tu_dial(TU *tu, TU *target);
int tu_chat(TU *tu, char *msg);
#endif

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/**
* === DO NOT MODIFY THIS FILE ===
* If you need some other prototypes or constants in a header, please put them
* in another header file.
*
* When we grade, we will be replacing this file with our own copy.
* You have been warned.
* === DO NOT MODIFY THIS FILE ===
*/
#include "pbx.h"
#include "server.h"
char *tu_state_names[] = {
[TU_ON_HOOK] "ON HOOK",
[TU_RINGING] "RINGING",
[TU_DIAL_TONE] "DIAL TONE",
[TU_RING_BACK] "RING BACK",
[TU_BUSY_SIGNAL] "BUSY SIGNAL",
[TU_CONNECTED] "CONNECTED",
[TU_ERROR] "ERROR"
};
char *tu_command_names[] = {
[TU_PICKUP_CMD] "pickup",
[TU_HANGUP_CMD] "hangup",
[TU_DIAL_CMD] "dial",
[TU_CHAT_CMD] "chat"
};
/*
* Object that maintains the state of the Private Branch Exchange (PBX).
*/
PBX *pbx;

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#include <stdlib.h>
#include <unistd.h>
#include "pbx.h"
#include "server.h"
#include "debug.h"
static void terminate(int status);
/*
* "PBX" telephone exchange simulation.
*
* Usage: pbx <port>
*/
int main(int argc, char* argv[]){
// Option processing should be performed here.
// Option '-p <port>' is required in order to specify the port number
// on which the server should listen.
// Perform required initialization of the PBX module.
debug("Initializing PBX...");
pbx = pbx_init();
// TODO: Set up the server socket and enter a loop to accept connections
// on this socket. For each connection, a thread should be started to
// run function pbx_client_service(). In addition, you should install
// a SIGHUP handler, so that receipt of SIGHUP will perform a clean
// shutdown of the server.
fprintf(stderr, "You have to finish implementing main() "
"before the PBX server will function.\n");
terminate(EXIT_FAILURE);
}
/*
* Function called to cleanly shut down the server.
*/
static void terminate(int status) {
debug("Shutting down PBX...");
pbx_shutdown(pbx);
debug("PBX server terminating");
exit(status);
}

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/*
* PBX: simulates a Private Branch Exchange.
*/
#include <stdlib.h>
#include "pbx.h"
#include "debug.h"
/*
* Initialize a new PBX.
*
* @return the newly initialized PBX, or NULL if initialization fails.
*/
#if 0
PBX *pbx_init() {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Shut down a pbx, shutting down all network connections, waiting for all server
* threads to terminate, and freeing all associated resources.
* If there are any registered extensions, the associated network connections are
* shut down, which will cause the server threads to terminate.
* Once all the server threads have terminated, any remaining resources associated
* with the PBX are freed. The PBX object itself is freed, and should not be used again.
*
* @param pbx The PBX to be shut down.
*/
#if 0
void pbx_shutdown(PBX *pbx) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Register a telephone unit with a PBX at a specified extension number.
* This amounts to "plugging a telephone unit into the PBX".
* The TU is initialized to the TU_ON_HOOK state.
* The reference count of the TU is increased and the PBX retains this reference
*for as long as the TU remains registered.
* A notification of the assigned extension number is sent to the underlying network
* client.
*
* @param pbx The PBX registry.
* @param tu The TU to be registered.
* @param ext The extension number on which the TU is to be registered.
* @return 0 if registration succeeds, otherwise -1.
*/
#if 0
int pbx_register(PBX *pbx, TU *tu, int ext) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Unregister a TU from a PBX.
* This amounts to "unplugging a telephone unit from the PBX".
* The TU is disassociated from its extension number.
* Then a hangup operation is performed on the TU to cancel any
* call that might be in progress.
* Finally, the reference held by the PBX to the TU is released.
*
* @param pbx The PBX.
* @param tu The TU to be unregistered.
* @return 0 if unregistration succeeds, otherwise -1.
*/
#if 0
int pbx_unregister(PBX *pbx, TU *tu) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Use the PBX to initiate a call from a specified TU to a specified extension.
*
* @param pbx The PBX registry.
* @param tu The TU that is initiating the call.
* @param ext The extension number to be called.
* @return 0 if dialing succeeds, otherwise -1.
*/
#if 0
int pbx_dial(PBX *pbx, TU *tu, int ext) {
// TO BE IMPLEMENTED
abort();
}
#endif

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/*
* "PBX" server module.
* Manages interaction with a client telephone unit (TU).
*/
#include <stdlib.h>
#include "debug.h"
#include "pbx.h"
#include "server.h"
/*
* Thread function for the thread that handles interaction with a client TU.
* This is called after a network connection has been made via the main server
* thread and a new thread has been created to handle the connection.
*/
#if 0
void *pbx_client_service(void *arg) {
// TO BE IMPLEMENTED
abort();
}
#endif

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/*
* TU: simulates a "telephone unit", which interfaces a client with the PBX.
*/
#include <stdlib.h>
#include "pbx.h"
#include "debug.h"
/*
* Initialize a TU
*
* @param fd The file descriptor of the underlying network connection.
* @return The TU, newly initialized and in the TU_ON_HOOK state, if initialization
* was successful, otherwise NULL.
*/
#if 0
TU *tu_init(int fd) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Increment the reference count on a TU.
*
* @param tu The TU whose reference count is to be incremented
* @param reason A string describing the reason why the count is being incremented
* (for debugging purposes).
*/
#if 0
void tu_ref(TU *tu, char *reason) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Decrement the reference count on a TU, freeing it if the count becomes 0.
*
* @param tu The TU whose reference count is to be decremented
* @param reason A string describing the reason why the count is being decremented
* (for debugging purposes).
*/
#if 0
void tu_unref(TU *tu, char *reason) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Get the file descriptor for the network connection underlying a TU.
* This file descriptor should only be used by a server to read input from
* the connection. Output to the connection must only be performed within
* the PBX functions.
*
* @param tu
* @return the underlying file descriptor, if any, otherwise -1.
*/
#if 0
int tu_fileno(TU *tu) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Get the extension number for a TU.
* This extension number is assigned by the PBX when a TU is registered
* and it is used to identify a particular TU in calls to tu_dial().
* The value returned might be the same as the value returned by tu_fileno(),
* but is not necessarily so.
*
* @param tu
* @return the extension number, if any, otherwise -1.
*/
#if 0
int tu_extension(TU *tu) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Set the extension number for a TU.
* A notification is set to the client of the TU.
* This function should be called at most once one any particular TU.
*
* @param tu The TU whose extension is being set.
*/
#if 0
int tu_set_extension(TU *tu, int ext) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Initiate a call from a specified originating TU to a specified target TU.
* If the originating TU is not in the TU_DIAL_TONE state, then there is no effect.
* If the target TU is the same as the originating TU, then the TU transitions
* to the TU_BUSY_SIGNAL state.
* If the target TU already has a peer, or the target TU is not in the TU_ON_HOOK
* state, then the originating TU transitions to the TU_BUSY_SIGNAL state.
* Otherwise, the originating TU and the target TU are recorded as peers of each other
* (this causes the reference count of each of them to be incremented),
* the target TU transitions to the TU_RINGING state, and the originating TU
* transitions to the TU_RING_BACK state.
*
* In all cases, a notification of the resulting state of the originating TU is sent to
* to the associated network client. If the target TU has changed state, then its client
* is also notified of its new state.
*
* If the caller of this function was unable to determine a target TU to be called,
* it will pass NULL as the target TU. In this case, the originating TU will transition
* to the TU_ERROR state if it was in the TU_DIAL_TONE state, and there will be no
* effect otherwise. This situation is handled here, rather than in the caller,
* because here we have knowledge of the current TU state and we do not want to introduce
* the possibility of transitions to a TU_ERROR state from arbitrary other states,
* especially in states where there could be a peer TU that would have to be dealt with.
*
* @param tu The originating TU.
* @param target The target TU, or NULL if the caller of this function was unable to
* identify a TU to be dialed.
* @return 0 if successful, -1 if any error occurs that results in the originating
* TU transitioning to the TU_ERROR state.
*/
#if 0
int tu_dial(TU *tu, TU *target) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Take a TU receiver off-hook (i.e. pick up the handset).
* If the TU is in neither the TU_ON_HOOK state nor the TU_RINGING state,
* then there is no effect.
* If the TU is in the TU_ON_HOOK state, it goes to the TU_DIAL_TONE state.
* If the TU was in the TU_RINGING state, it goes to the TU_CONNECTED state,
* reflecting an answered call. In this case, the calling TU simultaneously
* also transitions to the TU_CONNECTED state.
*
* In all cases, a notification of the resulting state of the specified TU is sent to
* to the associated network client. If a peer TU has changed state, then its client
* is also notified of its new state.
*
* @param tu The TU that is to be picked up.
* @return 0 if successful, -1 if any error occurs that results in the originating
* TU transitioning to the TU_ERROR state.
*/
#if 0
int tu_pickup(TU *tu) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* Hang up a TU (i.e. replace the handset on the switchhook).
*
* If the TU is in the TU_CONNECTED or TU_RINGING state, then it goes to the
* TU_ON_HOOK state. In addition, in this case the peer TU (the one to which
* the call is currently connected) simultaneously transitions to the TU_DIAL_TONE
* state.
* If the TU was in the TU_RING_BACK state, then it goes to the TU_ON_HOOK state.
* In addition, in this case the calling TU (which is in the TU_RINGING state)
* simultaneously transitions to the TU_ON_HOOK state.
* If the TU was in the TU_DIAL_TONE, TU_BUSY_SIGNAL, or TU_ERROR state,
* then it goes to the TU_ON_HOOK state.
*
* In all cases, a notification of the resulting state of the specified TU is sent to
* to the associated network client. If a peer TU has changed state, then its client
* is also notified of its new state.
*
* @param tu The tu that is to be hung up.
* @return 0 if successful, -1 if any error occurs that results in the originating
* TU transitioning to the TU_ERROR state.
*/
#if 0
int tu_hangup(TU *tu) {
// TO BE IMPLEMENTED
abort();
}
#endif
/*
* "Chat" over a connection.
*
* If the state of the TU is not TU_CONNECTED, then nothing is sent and -1 is returned.
* Otherwise, the specified message is sent via the network connection to the peer TU.
* In all cases, the states of the TUs are left unchanged and a notification containing
* the current state is sent to the TU sending the chat.
*
* @param tu The tu sending the chat.
* @param msg The message to be sent.
* @return 0 If the chat was successfully sent, -1 if there is no call in progress
* or some other error occurs.
*/
#if 0
int tu_chat(TU *tu, char *msg) {
// TO BE IMPLEMENTED
abort();
}
#endif

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#include "pbx.h"
#include "server.h"
#define QUOTE1(x) #x
#define QUOTE(x) QUOTE1(x)
#define SCRIPT1(x) x##_script
#define SCRIPT(x) SCRIPT1(x)
#define SERVER_PORT 9999
#define SERVER_PORT_STR "9999"
#define SERVER_HOSTNAME "localhost"
#define NUM_STATES 7
#define NUM_COMMANDS 5
#define DELAY_COMMAND (NUM_COMMANDS-1)
#define ZERO_SEC { 0, 0 }
#define ONE_USEC { 0, 1 }
#define ONE_MSEC { 0, 1000 }
#define TEN_MSEC { 0, 10000 }
#define FTY_MSEC { 0, 50000 }
#define HND_MSEC { 0, 100000 }
#define QTR_SEC { 0, 250000 }
#define ONE_SEC { 1, 0 }
#define SERVER_STARTUP_SLEEP 1
#define SERVER_SHUTDOWN_SLEEP 1
/*
* Structure describing a single step in a test script.
*/
typedef struct test_step {
int id; // Index of TU performing test, or -1 if end.
TU_COMMAND command; // Command to send.
int id_to_dial; // ID of TU to dial, for TU_DIAL command.
TU_STATE response; // Expected response.
struct timeval timeout; // Limit on time to wait for response (zero for no limit)
// or time to delay.
} TEST_STEP;
int run_test_script(char *name, TEST_STEP *scr, int port);

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/*
* Important: the Criterion tests in this file have to be run with -j1,
* because they each start a separate server instance and if they are
* run concurrently only one server will be able to bind the server port
* and the others will fail.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <criterion/criterion.h>
#include <pthread.h>
#include "__test_includes.h"
static int server_pid;
static void wait_for_server() {
int ret;
int i = 0;
do {
fprintf(stderr, "Waiting for server to start (i = %d)\n", i);
ret = system("netstat -an | grep 'LISTEN[ ]*$' | grep ':"SERVER_PORT_STR"'");
sleep(SERVER_STARTUP_SLEEP);
} while(++i < 30 && WEXITSTATUS(ret));
}
static void wait_for_no_server() {
int ret;
do {
ret = system("netstat -an | grep 'LISTEN[ ]*$' | grep ':"SERVER_PORT_STR"'");
if(WEXITSTATUS(ret) == 0) {
fprintf(stderr, "Waiting for server port to clear...\n");
system("killall -s KILL pbx > /dev/null");
sleep(1);
} else {
break;
}
} while(1);
}
static void init() {
server_pid = 0;
wait_for_no_server();
fprintf(stderr, "***Starting server...");
if((server_pid = fork()) == 0) {
execlp("bin/pbx", "pbx", "-p", SERVER_PORT_STR, NULL);
fprintf(stderr, "Failed to exec server\n");
abort();
}
fprintf(stderr, "pid = %d\n", server_pid);
// Wait for server to start before returning
wait_for_server();
}
static void fini(int chk) {
int ret;
cr_assert(server_pid != 0, "No server was started!\n");
fprintf(stderr, "***Sending SIGHUP to server pid %d\n", server_pid);
kill(server_pid, SIGHUP);
sleep(SERVER_SHUTDOWN_SLEEP);
kill(server_pid, SIGKILL);
wait(&ret);
fprintf(stderr, "***Server wait() returned = 0x%x\n", ret);
if(chk) {
if(WIFSIGNALED(ret))
cr_assert_fail("***Server terminated ungracefully with signal %d\n", WTERMSIG(ret));
cr_assert_eq(WEXITSTATUS(ret), 0, "Server exit status was not 0");
}
}
static void killall() {
system("killall -s KILL pbx /usr/lib/valgrind/memcheck-amd64-linux > /dev/null 2>&1");
}
#define SUITE basecode_suite
#define TEST_NAME connect_disconnect_test
static TEST_STEP SCRIPT(TEST_NAME)[] = {
// ID, COMMAND, ID_TO_DIAL, RESPONSE, TIMEOUT
{ 0, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 0, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ -1, -1, -1, -1, ZERO_SEC }
};
Test(SUITE, TEST_NAME, .init = init, .fini = killall, .timeout = 30)
{
char *name = QUOTE(SUITE)"/"QUOTE(TEST_NAME);
int ret = run_test_script(name, SCRIPT(TEST_NAME), SERVER_PORT);
cr_assert_eq(ret, 0, "expected %d, was %d\n", 0, ret);
fini(0);
}
#undef TEST_NAME
#define TEST_NAME connect_disconnect2_test
static TEST_STEP SCRIPT(TEST_NAME)[] = {
// ID, COMMAND, ID_TO_DIAL, RESPONSE, TIMEOUT
{ 0, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 1, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 0, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ 1, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ -1, -1, -1, -1, ZERO_SEC }
};
Test(SUITE, TEST_NAME, .init = init, .fini = killall, .timeout = 30) {
char *name = QUOTE(SUITE)"/"QUOTE(TEST_NAME);
int ret = run_test_script(name, SCRIPT(TEST_NAME), SERVER_PORT);
cr_assert_eq(ret, 0, "expected %d, was %d\n", 0, ret);
fini(0);
}
#undef TEST_NAME
#define TEST_NAME pickup_hangup_test
static TEST_STEP SCRIPT(TEST_NAME)[] = {
// ID, COMMAND, ID_TO_DIAL, RESPONSE, TIMEOUT
{ 0, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 0, TU_PICKUP_CMD, -1, TU_DIAL_TONE, TEN_MSEC },
{ 0, TU_HANGUP_CMD, -1, TU_ON_HOOK, TEN_MSEC },
{ 0, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ -1, -1, -1, -1, ZERO_SEC }
};
Test(SUITE, TEST_NAME, .init = init, .fini = killall, .timeout = 30) {
char *name = QUOTE(SUITE)"/"QUOTE(TEST_NAME);
int ret = run_test_script(name, SCRIPT(TEST_NAME), SERVER_PORT);
cr_assert_eq(ret, 0, "expected %d, was %d\n", 0, ret);
fini(0);
}
#undef TEST_NAME
#define TEST_NAME dial_answer_test
static TEST_STEP SCRIPT(TEST_NAME)[] = {
// ID, COMMAND, ID_TO_DIAL, RESPONSE, TIMEOUT
{ 0, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 1, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 0, TU_PICKUP_CMD, -1, TU_DIAL_TONE, TEN_MSEC },
{ 0, TU_DIAL_CMD, 1, TU_RING_BACK, TEN_MSEC },
{ 1, TU_PICKUP_CMD, -1, TU_CONNECTED, TEN_MSEC },
{ 0, TU_HANGUP_CMD, -1, TU_ON_HOOK, FTY_MSEC },
{ 1, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ 0, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ -1, -1, -1, -1, ZERO_SEC }
};
Test(SUITE, TEST_NAME, .init = init, .fini = killall, .timeout = 30) {
char *name = QUOTE(SUITE)"/"QUOTE(TEST_NAME);
int ret = run_test_script(name, SCRIPT(TEST_NAME), SERVER_PORT);
cr_assert_eq(ret, 0, "expected %d, was %d\n", 0, ret);
fini(0);
}
#undef TEST_NAME
#define TEST_NAME dial_disconnect_test
static TEST_STEP SCRIPT(TEST_NAME)[] = {
// ID, COMMAND, ID_TO_DIAL, RESPONSE, TIMEOUT
{ 0, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 1, TU_CONNECT_CMD, -1, TU_ON_HOOK, HND_MSEC },
{ 0, TU_PICKUP_CMD, -1, TU_DIAL_TONE, TEN_MSEC },
{ 0, TU_DIAL_CMD, 1, TU_RING_BACK, TEN_MSEC },
{ 1, TU_PICKUP_CMD, -1, TU_CONNECTED, TEN_MSEC },
{ 1, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ 0, TU_HANGUP_CMD, -1, TU_ON_HOOK, FTY_MSEC },
{ 0, TU_DISCONNECT_CMD, -1, -1, TEN_MSEC },
{ -1, -1, -1, -1, ZERO_SEC }
};
Test(SUITE, TEST_NAME, .init = init, .fini = killall, .timeout = 30) {
char *name = QUOTE(SUITE)"/"QUOTE(TEST_NAME);
int ret = run_test_script(name, SCRIPT(TEST_NAME), SERVER_PORT);
cr_assert_eq(ret, 0, "expected %d, was %d\n", 0, ret);
fini(0);
}
#undef TEST_NAME

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#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/time.h>
#include "pbx.h"
#include "server.h"
#include "__test_includes.h"
#include "debug.h"
#define NUM_STATES 7
#define NUM_COMMANDS 5
#define DELAY_COMMAND (NUM_COMMANDS-1)
/*
* Table of expected next states.
* Each entry is a bitmap that specifies a set of possible next states, given
* the current state and the last command that was issued.
*
* An issue that this tester has to handle is that commands to the server can
* "cross in transit" asynchronous state-change notifications coming back from the server.
* If we are currently in the TU_ON_HOOK state and we send a TU_PICKUP_CMD, it might
* be that the TU_PICKUP_CMD crosses in transit a TU_RINGING notification being sent
* back to us. What we will see is a next-state notification of TU_RINGING, rather
* than the TU_DIAL_TONE notification that we would otherwise expect.
*
* To handle this, there are two classes of expected states encoded in each entry of
* the table. The "normal case" encodes a TU_STATE s as the bit value 1<<s, and it
* indicates a state that we would expect to see if there were no "crossing in transit".
* The "abnormal case" encodes additional states that we might see when messages
* cross in transit. These are encoded as 1<<(s+RESYNC), where RESYNC is larger than
* any TU_STATE value. When we receive a state notification, it is checked against
* the expected state bitmap. If we find that state among the "normal case" states,
* then nothing special happens and we proceed on to selecting the next command to send.
* On the other hand, if we find that state among the "abnormal case" states, then
* a "resync" flag is set and we do not immediately select a new command to send.
* Instead, we assume that what we have just received is an asynchronous state-change
* notification that crossed in transit our last command, and that the response to
* our last command is still forthcoming. In this situation, we redetermine the set
* of expected events based on the new state, but the last command that we sent.
* When we finally do receive a "normal case" response, then the resynchronization is
* over and we proceed to send another command.
*
* A deficiency in the current implementation is that there ought to be a timeout after
* which we declare failure if a resynchronization has not completed within a short
* period of time.
*
* Another deficiency at the moment is that the tester tests that "bad things don't happen",
* but it doesn't really check that "good things do happen" (e.g. that calls get connected).
*
* One other deficiency is in the treatment of delays. When the action chosen from a state
* is to delay, the delays will continue until a non-delay action is chosen, without reading
* any notifications from the server until the delay period is over. It would be better if
* the arrival of notifications from the server was checked after each basic delay, but that
* would further complicate the program and it has not been implemented at this time.
*/
#define RESYNC NUM_STATES
int next_states[NUM_STATES][NUM_COMMANDS] = {
[TU_ON_HOOK] {
1<<TU_DIAL_TONE | 1<<(TU_RINGING+RESYNC) | 1<<(TU_ON_HOOK+RESYNC), // TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_RINGING+RESYNC), // TU_HANGUP_CMD
1<<TU_ON_HOOK | 1<<(TU_RINGING+RESYNC), // TU_DIAL_CMD
1<<TU_ON_HOOK | 1<<(TU_RINGING+RESYNC), // TU_CHAT_CMD
1<<(TU_ON_HOOK+RESYNC) | 1<<(TU_RINGING+RESYNC) // DELAY
},
[TU_RINGING] {
1<<TU_CONNECTED | 1<<(TU_ON_HOOK+RESYNC) | 1<<(TU_RINGING+RESYNC), // TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_RINGING+RESYNC), // TU_HANGUP_CMD
1<<TU_RINGING | 1<<(TU_ON_HOOK+RESYNC), // TU_DIAL_CMD
1<<TU_RINGING | 1<<(TU_ON_HOOK+RESYNC), // TU_CHAT_CMD
1<<(TU_RINGING+RESYNC) | 1<<(TU_ON_HOOK+RESYNC) // DELAY
},
[TU_DIAL_TONE] {
1<<TU_DIAL_TONE, // TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_DIAL_TONE+RESYNC), // TU_HANGUP_CMD
1<<TU_RING_BACK | 1<<TU_BUSY_SIGNAL | 1<<TU_ERROR
| 1<<(TU_DIAL_TONE+RESYNC), // TU_DIAL_CMD
1<<TU_DIAL_TONE, // TU_CHAT_CMD
1<<(TU_DIAL_TONE+RESYNC) // DELAY
},
[TU_RING_BACK] {
1<<TU_RING_BACK | 1<<(TU_CONNECTED+RESYNC) | 1<<(TU_DIAL_TONE+RESYNC),// TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_CONNECTED+RESYNC) | 1<<(TU_DIAL_TONE+RESYNC)
| 1<<(TU_RING_BACK+RESYNC), // TU_HANGUP_CMD
1<<TU_RING_BACK | 1<<(TU_CONNECTED+RESYNC) | 1<<(TU_DIAL_TONE+RESYNC),// TU_DIAL_CMD
1<<TU_RING_BACK | 1<<(TU_CONNECTED+RESYNC) | 1<<(TU_DIAL_TONE+RESYNC),// TU_CHAT_CMD
1<<(TU_RING_BACK+RESYNC) | 1<<(TU_CONNECTED+RESYNC) | 1<<(TU_DIAL_TONE+RESYNC) // DELAY
},
[TU_BUSY_SIGNAL] {
1<<TU_BUSY_SIGNAL, // TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_BUSY_SIGNAL+RESYNC), // TU_HANGUP_CMD
1<<TU_BUSY_SIGNAL, // TU_DIAL_CMD
1<<TU_BUSY_SIGNAL, // TU_CHAT_CMD
1<<(TU_BUSY_SIGNAL+RESYNC) // DELAY
},
[TU_CONNECTED] {
1<<TU_CONNECTED | 1<<(TU_DIAL_TONE+RESYNC) | 1<<(TU_CONNECTED+RESYNC),// TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_DIAL_TONE+RESYNC) | 1<<(TU_CONNECTED+RESYNC), // TU_HANGUP_CMD
1<<TU_CONNECTED | 1<<(TU_DIAL_TONE+RESYNC), // TU_DIAL_CMD
1<<TU_CONNECTED | 1<<(TU_DIAL_TONE+RESYNC), // TU_CHAT_CMD
1<<(TU_CONNECTED+RESYNC) | 1<<(TU_DIAL_TONE+RESYNC) // DELAY
},
[TU_ERROR] {
1<<TU_ERROR, // TU_PICKUP_CMD
1<<TU_ON_HOOK | 1<<(TU_ERROR+RESYNC), // TU_HANGUP_CMD
1<<TU_ERROR, // TU_DIAL_CMD
1<<TU_ERROR, // TU_CHAT_CMD
1<<(TU_ERROR+RESYNC) // DELAY
}
};
/*
* Structure that records the state of a single TU under test.
*/
typedef struct tu {
/* File descriptor for input from server connection, or 0 if not connected. */
int infd;
/* File descriptor for output to server connection, or 0 if not connected. */
int outfd;
/* Input stream from the server. */
FILE *in;
/* Output stream to the server. */
FILE *out;
/* Extension number we have been assigned by the server. */
int extension;
/* Extension to which we are connnected. */
int peer;
/* The current state of the TU simulated by the tester. */
TU_STATE current_state;
/*
* A bitmap that specifies the set of next states we expect, as described above.
* A transition to a state not in this set results in a test failure.
*/
int expected_states;
/*
* Flag that indicates whether we are currently resynchronizing, as a result of
* due to messages that "crossed in transit".
*/
int resync;
/*
* The last command sent to the server. This is used during resynchronization,
* to determine a new set of expected states as each successive asynchronous
* notification is received.
*/
TU_COMMAND last_command;
} TU;
/*
* Table giving the states of all TUs under test.
*/
#define MAX_TUS 20
TU tus[MAX_TUS];
#define TU_ID(tu) ((tu) - &tus[0])
/*
* "Meta-commands" for the test script.
* These are not actual TU commands, but rather specify other actions to
* be performed during a test script.
*/
#if 0
#define TU_NO_CMD 100
#define TU_CONNECT_CMD 101
#define TU_DISCONNECT_CMD 102
#define TU_AWAIT_CMD 103 // Await a specified TU state (e.g. TU_RINGING)
#define TU_DELAY_CMD 104 // Timeout specifies time delay
#endif
/*
* Sample test script.
* Later these will be provided by individual Criterion tests.
*/
#if 0
TEST_STEP sample_test_script[] = {
// ID, COMMAND, ID_TO_DIAL, RESPONSE, TIMEOUT
{ 0, TU_CONNECT_CMD, -1, TU_ON_HOOK, { 1, 0 }},
{ 1, TU_CONNECT_CMD, -1, TU_ON_HOOK, { 1, 0 }},
{ 1, TU_PICKUP_CMD, -1, TU_DIAL_TONE, { 1, 0 }},
{ 1, TU_DIAL_CMD, 0, TU_RING_BACK, { 1, 0 }},
{ 0, TU_AWAIT_CMD, -1, TU_RINGING, { 1, 0 }},
{ 0, TU_PICKUP_CMD, -1, TU_CONNECTED, { 1, 0 }},
{ 0, TU_DISCONNECT_CMD, -1, -1, { 1, 0 }},
{ 1, TU_DISCONNECT_CMD, -1, -1, { 1, 0 }},
{ -1, -1, -1, -1, { 0, 0 }}
};
#endif
/* Prototypes for functions that appear below. */
static void test(FILE *in, FILE *out, int cmds);
static int choose_action(void);
static TU_STATE parse_message(char *msg, char **arg);
static char *unparse_state_set(int set);
static void trim_eol(char *msg);
static char *timestamp(void);
static int connect_command(TU *tu, int port);
static void disconnect_command(TU *tu);
static int connect_to_server(struct in_addr *addr, int port);
static int read_responses(TU *tu, TU_STATE exp, struct timeval tv);
/*
* Temporary main until this is fleshed out.
* Then it will be hooked to Criterion.
*/
#if 0
int main(int argc, char *argv[]) {
if(run_test_script(sample_test_script, SERVER_PORT) == -1) {
debug("Script failed");
return EXIT_FAILURE;
} else {
debug("Script succeeded");
return EXIT_SUCCESS;
}
}
#endif
static void alert(int sig) {
fprintf(stderr, "Unexpected signal: %d\n", sig);
abort();
}
/*
* Run a test script provided as a parameter.
* Returns 0 on success, -1 on failure.
*/
int run_test_script(char *name, TEST_STEP *scr, int port) {
fprintf(stderr, "Running test %s\n", name);
signal(SIGPIPE, alert);
signal(SIGSEGV, alert);
signal(SIGHUP, alert);
signal(SIGINT, alert);
TEST_STEP *ts = scr;
struct timespec tms = {0};
while(ts->id != -1) {
if(ts->id >= MAX_TUS) {
fprintf(stderr, "Script error: TU ID %d too large (>= %d)\n", ts->id, MAX_TUS);
return -1;
}
int cmd = ts->command;
int ext = -1;
TU *tu = &tus[ts->id];
// First, deal with performing any explicit action.
switch(ts->command) {
// Meta-commands
case TU_NO_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) TU_NO_CMD\n", timestamp(), TU_ID(tu), ts - scr);
break;
case TU_CONNECT_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) TU_CONNECT_CMD\n", timestamp(), TU_ID(tu), ts - scr);
if(tu->infd) {
fprintf(stderr, "%s: [%ld] Test error: already connected\n",
timestamp(), TU_ID(tu));
return -1;
}
// Otherwise connect to server and update state.
if(connect_command(tu, port) == -1)
return -1;
break;
case TU_DISCONNECT_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) TU_DISCONNECT_CMD\n", timestamp(), TU_ID(tu), ts - scr);
if(!tu->infd) {
fprintf(stderr, "%s: [%ld] Test error: not connected\n", timestamp(), TU_ID(tu));
return -1;
}
disconnect_command(tu);
break;
case TU_DELAY_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) TU_DELAY_CMD\n", timestamp(), TU_ID(tu), ts - scr);
// Pause for the specified amount of time.
tms.tv_sec = ts->timeout.tv_sec;
tms.tv_nsec = ts->timeout.tv_usec * 1000l;
nanosleep(&tms, NULL);
break;
case TU_AWAIT_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) TU_AWAIT_CMD\n", timestamp(), TU_ID(tu), ts - scr);
// Process incoming messages until specified state seen
// or timeout occurs.
break;
// Real commands
case TU_PICKUP_CMD:
case TU_HANGUP_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) %s\n",
timestamp(), TU_ID(tu), ts - scr, tu_command_names[cmd]);
fprintf(tu->out, "%s%s", tu_command_names[cmd], EOL);
fflush(tu->out);
break;
case TU_DIAL_CMD:
ext = tus[ts->id_to_dial].extension;
fprintf(stderr, "%s: [%ld] (step #%ld) %s extension %d (id %d)\n",
timestamp(), TU_ID(tu), ts - scr, tu_command_names[cmd], ext, ts->id_to_dial);
fprintf(tu->out, "%s %d%s", tu_command_names[cmd], ext, EOL);
fflush(tu->out);
break;
case TU_CHAT_CMD:
fprintf(stderr, "%s: [%ld] (step #%ld) %s\n",
timestamp(), TU_ID(tu), ts - scr, tu_command_names[cmd]);
fprintf(tu->out, "%s%s", tu_command_names[cmd], EOL);
fflush(tu->out);
break;
// Unknown command
default:
fprintf(stderr, "%s: [%ld] (step #%ld) Test error: unknown command (%d)\n",
timestamp(), TU_ID(tu), ts - scr, cmd);
return -1;
}
if(cmd <= TU_CHAT_CMD) {
tu->last_command = cmd;
tu->expected_states = next_states[tu->current_state][cmd];
} else if(cmd == TU_CONNECT_CMD) {
// This is to get the right set of expected commands on initial connect,
// when no previous command has actually been sent.
tu->last_command = TU_HANGUP_CMD;
tu->expected_states = next_states[tu->current_state][TU_HANGUP_CMD];
} else if(cmd == TU_DISCONNECT_CMD) {
fprintf(stderr, "%s: [%ld] Disconnected, now expecting EOF\n", timestamp(), TU_ID(tu));
tu->last_command = cmd;
tu->expected_states = ~0; // We allow anything to drain pending notifications.
} else {
// For pseudo-commands, just recalculate the expected states based on
// the last real command.
tu->expected_states = next_states[tu->current_state][tu->last_command];
}
// Next, read responses while keeping track of timeout.
// If expected response seen, go to next step.
// If unexpected response seen, fail.
// If timeout occurs, shutdown the connection so that read will fail.
if(tu->infd && read_responses(tu, ts->response, ts->timeout) == -1)
return -1;
// Advance script to next test step.
ts++;
}
return 0;
}
/*
* Connect a specified TU to the server.
* Returns 0 on success, -1 on error.
*/
static int connect_command(TU *tu, int port) {
char *hostname = "localhost";
struct in_addr sa;
struct hostent *he;
int sfd;
// Connect to server on specified port and set sfd.
if((he = gethostbyname(hostname)) == NULL) {
herror("gethostbyname");
return -1;
}
memcpy(&sa, he->h_addr, sizeof(sa));
if((sfd = connect_to_server(&sa, port)) == -1) {
fprintf(stdout, "%s [%ld]: Failed to connect to server %s:%d\n",
timestamp(), TU_ID(tu), hostname, port);
return -1;
}
struct sockaddr_in s;
socklen_t sl = sizeof(s);
getsockname(sfd, (struct sockaddr *)&s, &sl);
port = s.sin_port;
fprintf(stdout, "%s: [%ld] Connected to server %s:%d\n",
timestamp(), TU_ID(tu), hostname, port);
// Save file descriptor and set up streams and initial test state.
memset(tu, 0, sizeof(*tu));
tu->infd = sfd;
tu->outfd = dup(sfd); // So they can be closed independently.
tu->in = fdopen(tu->infd, "r");
tu->out = fdopen(tu->outfd, "w");
// Initial expected state notification is TU_ON_HOOK
tu->expected_states = 1<<TU_ON_HOOK;
// Set initial last command to TU_HANGUP so that updating expected states
// works properly.
tu->last_command = TU_HANGUP_CMD;
return 0;
}
/*
* Disconnect a specified TU from the server.
*/
static void disconnect_command(TU *tu) {
if(tu->outfd) {
shutdown(tu->outfd, SHUT_WR); // This lets us see if the server notices.
tu->outfd = 0;
}
if(tu->out) {
fclose(tu->out);
tu->out = NULL;
}
// Closing the input should go where we detect EOF.
#if 0
if(tu->in) {
fclose(tu->in);
tu->in = NULL;
}
#endif
}
/* There isn't really a maximum message length, but this is just a test driver... */
#define MAX_MESSAGE_LEN 256
static struct timeval current_timeout;
static TU *tu_to_read;
static void alarm_handler(int sig) {
fprintf(stderr, "%s: [%ld] Timeout (%ld, %ld)\n", timestamp(), TU_ID(tu_to_read),
current_timeout.tv_sec, current_timeout.tv_usec);
shutdown(tu_to_read->infd, SHUT_RD); // Force return from fgets
}
/*
* Read responses from the server for a specified TU until an expected state is reached.
*/
static int read_responses(TU *tu, TU_STATE exp, struct timeval tv) {
TU_STATE new;
char msg[MAX_MESSAGE_LEN];
char *arg;
int ret = 0;
fprintf(stderr, "%s: [%ld] Read responses until %s\n",
timestamp(), TU_ID(tu), exp == -1 ? "EOF" : tu_state_names[exp]);
tu_to_read = tu;
struct itimerval itv = {0};
struct sigaction sa = {0}, oa;
sa.sa_handler = alarm_handler;
sa.sa_flags = SA_RESTART;
itv.it_value = tv;
current_timeout = tv;
sigaction(SIGALRM, &sa, &oa);
setitimer(ITIMER_REAL, &itv, NULL);
memset(&itv, 0, sizeof(itv));
itv.it_value = tv;
setitimer(ITIMER_REAL, &itv, NULL);
do {
fprintf(stderr, "%s: [%ld] Expecting: %s\n", timestamp(), TU_ID(tu),
unparse_state_set(tu->expected_states));
if(fgets(msg, MAX_MESSAGE_LEN, tu->in) == NULL) {
fprintf(stderr, "%s: [%ld] EOF reading message from server\n", timestamp(), TU_ID(tu));
fclose(tu->in);
tu->infd = 0;
if(tu->resync) {
fprintf(stderr, "%s: [%ld] Premature disconnection during resync\n",
timestamp(), TU_ID(tu));
ret = -1;
goto disarm;
} else {
if(tu->expected_states == ~0) {
fprintf(stderr, "%s: [%ld] Matched EOF after disconnect\n",
timestamp(), TU_ID(tu));
goto disarm;
} else {
if(exp == -1) {
fprintf(stderr, "%s: [%ld] Expected EOF correctly seen\n",
timestamp(), TU_ID(tu));
} else {
fprintf(stderr, "%s: [%ld] EOF seen when it shouldn't have been\n",
timestamp(), TU_ID(tu));
ret = -1;
}
goto disarm;
}
}
}
trim_eol(msg);
fprintf(stderr, "%s: [%ld] Message from server: %s\n", timestamp(), TU_ID(tu), msg);
new = parse_message(msg, &arg);
if(new > NUM_STATES) {
// Tracing output already produced by parse_message.
ret = -1;
goto disarm;
}
if(new == NUM_STATES) {
// The message is chat. There is no state transition, but we must be
// in the connected state.
if(tu->current_state != TU_CONNECTED) {
fprintf(stderr, "%s: [%ld] Chat received when not in state %s\n",
timestamp(), TU_ID(tu), tu_state_names[tu->current_state]);
ret = -1;
goto disarm;
}
continue;
}
// Check state transition to see if it is as expected.
if(1<<new & tu->expected_states) {
// OK
tu->resync = 0;
} else if(1<<(new+RESYNC) & tu->expected_states) {
// OK, but set resync because messages crossed in transit.
fprintf(stderr, "%s: [%ld] Resync: state %s, expecting %s\n",
timestamp(), TU_ID(tu), tu_state_names[new],
unparse_state_set(tu->expected_states));
tu->resync = 1;
} else {
// New state is not one that is expected -- testing fails.
fprintf(stderr, "%s: [%ld] New state %s is not in expected set %s\n",
timestamp(), TU_ID(tu), tu_state_names[new],
unparse_state_set(tu->expected_states));
ret = -1;
goto disarm;
}
// Update current state to that specified in message
fprintf(stderr, "%s: [%ld] Change state: %s -> %s\n",
timestamp(), TU_ID(tu), tu_state_names[tu->current_state], tu_state_names[new]);
tu->current_state = new;
if(new == TU_ON_HOOK) {
int ext = atoi(arg);
if(tu->extension != ext) {
tu->extension = ext;
}
}
if(new == TU_CONNECTED) {
int ext = atoi(arg);
tu->peer = ext;
} else {
tu->peer = -1;
}
if(tu->resync) {
// If resyncing, update expected states based on last command sent,
// unless we are draining to get EOF.
//fprintf(stderr, "%s: [%ld] Resync\n", timestamp(), TU_ID(tu));
if(tu->expected_states != ~0)
tu->expected_states = next_states[new][tu->last_command];
}
} while(tu->current_state != exp);
disarm:
itv = (struct itimerval) {0};
setitimer(ITIMER_REAL, &itv, NULL);
sigaction(SIGALRM, &oa, NULL);
tu_to_read = NULL;
return ret;
}
/*
* Parse a message from the PBX, determining the new state.
*/
static TU_STATE parse_message(char *msg, char **arg) {
for(int i = 0; i < NUM_STATES; i++) {
if(strstr(msg, tu_state_names[i]) == msg) {
if(arg)
*arg = msg + strlen(tu_state_names[i]);
return i;
}
}
if(strstr(msg, "CHAT") == msg) {
if(arg)
*arg = msg + strlen("CHAT");
return NUM_STATES;
}
fprintf(stderr, "%s: Unrecognized message: %s\n", timestamp(), msg);
return NUM_STATES+1;
}
/*
* Connect to the server at a specified address.
*
* Returns: connection file descriptor in case of success.
* Returns -1 and sets errno in case of error.
*/
static int connect_to_server(struct in_addr *addr, int port) {
struct sockaddr_in sa;
int sfd;
if((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
return(-1);
}
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
memcpy(&sa.sin_addr.s_addr, addr, sizeof(struct in_addr));
if(connect(sfd, (struct sockaddr *)(&sa), sizeof(sa)) < 0) {
close(sfd);
return(-1);
}
return sfd;
}
/*
* Construct a string representation of an expected state bitmap.
*/
static char *unparse_state_set(int set) {
static char buf[100];
buf[0] = '\0';
strcat(buf, "{ ");
for(int i = 0; i < NUM_STATES; i++) {
if(set & (1<<i) || set & (1<<(i+RESYNC))) {
strcat(buf, tu_state_names[i]);
if(set & (1<<(i+RESYNC)))
strcat(buf, "*");
strcat(buf, " ");
}
}
strcat(buf, "}");
return buf;
}
/*
* Trim EOL characters from the end of a message.
*/
static void trim_eol(char *msg) {
for(char *mp = msg; *mp != '\0'; mp++) {
if(*mp == '\n' || *mp == '\r')
*mp = '\0';
}
}
/*
* Construct a timestamp string for tracing printout.
*/
static char *timestamp() {
static char buf[100];
struct timeval tv;
gettimeofday(&tv, NULL);
sprintf(buf, "%ld.%06ld", tv.tv_sec, tv.tv_usec);
return buf;
}