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Add functioning server

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This commit is contained in:
Ivaylo Ivanov 2018-11-09 21:46:52 +01:00
parent 400c3916ff
commit a8698e38f9
4 changed files with 177 additions and 44 deletions
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2
http/client.c
View File

@ -105,7 +105,7 @@ int main(int argc, char *argv[]) {
exit(EXIT_FAILURE);
}
char reply[sizeof(int32_t)]; //< Set the variable to hold the server response. Set to a big length
char reply[__INT16_MAX__]; //< Set the variable to hold the server response. Set to a big length
if((recv(sockfd, reply, strlen(reply) - 1, 0)) < 0) { //< Receive response from the remote (-1 for the trailing terminating char)
(void) fprintf(stderr, "ERROR: Did not receive response from the remote.\n");

12
http/public/greetings.html
View File

@ -0,0 +1,12 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Greetings</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>Hello, World!</h1>
</body>
</html>

12
http/public/index.html
View File

@ -0,0 +1,12 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Index</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>This is the index page</h1>
</body>
</html>

195
http/server.c
View File

@ -14,7 +14,10 @@
#define LISTEN_BACKLOG 5 //< Define maximum size of the input queue
static int create_server_socket(uint16_t port, struct sockaddr_in incoming);
static char * get_file_contents(char *dir, char *file);
static char * setup_server_response(char* dir, char* filename, int current_session, int sockfd);
static char * get_file_contents(char* dir, char* filename);
static char * wday_to_string(int day);
static char * month_to_string(int month);
int main(int argc, char *argv[]) {
check_opts_number(argc);
@ -22,7 +25,7 @@ int main(int argc, char *argv[]) {
char *cport = "8080";
char *ifile = "index.html";
char *dir = NULL;
char response[sizeof(int32_t)]; //< To hold the server response
char *response; //< To hold the server response
int c;
/// Process the options
@ -70,46 +73,8 @@ int main(int argc, char *argv[]) {
/// Start accepting connections
int current_session = accept(sockfd, (struct sockaddr*) &incoming, &peer_addr_size); //< Save the current session
if(current_session < 0) {
(void) fprintf(stderr, "ERROR: Could not start accepting connections\n");
close(sockfd);
exit(EXIT_FAILURE);
} else {
char request[sizeof(int32_t)];
if(recv(current_session, request, strlen(request) - 1, 0) < 0) {
(void) fprintf(stderr, "ERROR: Could not receive connection from client\n");
close(current_session);
close(sockfd);
exit(EXIT_FAILURE);
} else {
char method[4];
strncpy(method, request, 4); //< Get the request type
method[3] = 0; //< Add terminating char
if(strcmp(method, "GET") == 0) {
(void) fprintf(stdout, "Got here\n");
close(current_session);
close(sockfd);
} else {
fprintf(stderr, "ERROR: Unhandled HTTP request method received\n");
char header[sizeof(int8_t) + 100];
time_t t = time(NULL);
struct tm tm = *localtime(&t);
snprintf(
header,
sizeof header,
"HTTP/1.1 501 Not Implemented\r\nDate: %d, %d %d %d %d:%d:%d %s\r\nContent-Length: 0\r\nConnection: close\r\n\r\n",
tm.tm_wday, tm.tm_mday, tm.tm_mon, tm.tm_year + 1900, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_zone
); //< Build the header
puts(header);
strncpy(response, header, sizeof(header));
}
close(current_session);
close(sockfd);
}
}
/// Setup the server response
response = setup_server_response(dir, ifile, current_session, sockfd);
/// Send the response to the client
if(send(current_session, response, strlen(response) + 1, 0) < 0) {
@ -185,6 +150,85 @@ static int create_server_socket(uint16_t port, struct sockaddr_in incoming) {
return sockfd;
}
/**
* @brief Function to create the HTTP response
* @details Gets the client request
* If there is no current session, it exits with an error
* If the server could not receive a client connection, it exits with an error
* If a GET request is received, the function tries to open the resource:
* - if it could open it, it builds a 200 header and the file contents as body and adds them to response
* - if it could not open it, it builds a 404 header and adds it to response
* If anything other than a GET request is received, a 501 header is build, adds it to response and logs it
* At the end, it returns the server response with header and body (if available)
* @param dir - the directory of the file
* filename - the name of the file
* current_session - the current client session
* sockfd - the socket configuration
* @return response - A header with the status code and a body (if available)
**/
static char * setup_server_response(char* dir, char* filename, int current_session, int sockfd) {
if(current_session < 0) {
(void) fprintf(stderr, "ERROR: Could not start accepting connections\n");
close(current_session);
close(sockfd);
exit(EXIT_FAILURE);
} else {
char request[__INT16_MAX__];
static char response[__INT16_MAX__];
if(recv(current_session, request, strlen(request) - 1, 0) < 0) {
(void) fprintf(stderr, "ERROR: Could not receive connection from client\n");
close(current_session);
close(sockfd);
exit(EXIT_FAILURE);
} else {
char method[4];
strncpy(method, request, 4); //< Get the request type
method[3] = 0; //< Add terminating char
char header[__INT8_MAX__ + 100];
if(strcmp(method, "GET") == 0) {
char *body = get_file_contents(dir, filename);
if(body != NULL) {
time_t t = time(NULL);
struct tm tm = *gmtime(&t);
char *wday = wday_to_string(tm.tm_wday);
char *month = month_to_string(tm.tm_mon + 1);
snprintf(
header,
sizeof header,
"HTTP/1.1 200 OK\r\nDate: %s, %d %s %d %d:%d:%d %s\r\nContent-Length: %ld\r\nConnection: close\r\n\r\n",
wday, tm.tm_mday, month, tm.tm_year + 1900, tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_zone, strlen(body)
); //< Build the 200 header
strcat(response, header);
strcat(response, body);
} else {
snprintf(
header,
sizeof header,
"HTTP/1.1 404 Not Found\r\nConnection: close\r\n\r\n"
); //< Build the 404 header
strcat(response, header);
}
} else {
fprintf(stderr, "ERROR: Unhandled HTTP request method received\n");
snprintf(
header,
sizeof header,
"HTTP/1.1 501 Not ImplementedConnection: close\r\n\r\n"
); //< Build 501 the header
strcat(response, header);
}
return response;
}
}
}
/**
* @brief Function to take the contents of a specified file
* @details Gets the contents of the file specified
@ -196,7 +240,8 @@ static int create_server_socket(uint16_t port, struct sockaddr_in incoming) {
* @return res - The contents of the file, formatted as a string
**/
static char * get_file_contents(char *dir, char *filename) {
char *path = strcpy(dir, filename);
char path[strlen(dir) + strlen(filename) + 100]; //< set the variable for the path with a reasonable length
snprintf(path, sizeof path, "%s%s", dir, filename);
FILE *file = NULL;
@ -221,3 +266,67 @@ static char * get_file_contents(char *dir, char *filename) {
return res;
}
}
/**
* @brief Function to convert a int weekday to string weekday
* @details Gets the weekday as int, converts it to string and returns the string
* @param day - the weekday as int
* @return the weekday as a string
**/
static char * wday_to_string(int day) {
switch(day) {
case 1:
return "Mon";
case 2:
return "Tue";
case 3:
return "Wed";
case 4:
return "Thu";
case 5:
return "Fri";
case 6:
return "Sat";
case 7:
return "Sun";
default:
return NULL;
}
}
/**
* @brief Function to convert a int month to string month
* @details Gets the month as int, converts it to string and returns the string
* @param day - the month as int
* @return the month as a string
**/
static char * month_to_string(int month) {
switch(month) {
case 1:
return "Jan";
case 2:
return "Feb";
case 3:
return "Mar";
case 4:
return "Apr";
case 5:
return "May";
case 6:
return "Jun";
case 7:
return "Jul";
case 8:
return "Aug";
case 9:
return "Sep";
case 10:
return "Oct";
case 11:
return "Nov";
case 12:
return "Dec";
default:
return NULL;
}
}