Added dynamic pages

documentation/sitefiles.md

@@ -14,6 +14,7 @@ sitefiles also allow comments with #
 * ```set [variable] [value]``` - sets some local variable for the following pages
 * ```define [variable] [value]``` - sets some global variable
 * ```read [http path] [file path]``` - if the requested path matches ```[http path]```, return the contents of ```[file path]```. If [file path] is a directory, then the http path is appended to [file path] and that is read instead.
+* ```exec [http path] [file path]``` - if the requested path matches ```[http path]```, execute ```[file path]``` and send the the contents of stdout. ```argv[0]``` is the ```[file path]```, ```argv[1]``` is a header, ```argv[2]``` is the value for that header, ```argv[3]``` is the next header, and so on.
 
 ##### Other than set, commands should take in a regex as argument 1 and operate on a file specified in argument 2.
 

example/site/blog/blog/2022-1-31.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "<p>By the way today's date is $(date)</p>"

example/site/index.html

@@ -2,4 +2,5 @@
 
 <h3>It's not very polished but it's certainly a website</h3>
 
-<a href="blog/2021-1-25.html">2021-1-25</a>
+<a href="blog/2022-1-25.html">2021-1-25</a>
+<a href="blog/2022-1-31">2021-1-31</a>

example/sitefile

@@ -6,8 +6,10 @@ define timeout 2000
 set host localhost:8000
 read / site/index.html
 read /hello  site/hello.html
+exec /blog/2022-1-31 site/blog/blog/2022-1-31.sh
 read /blog/.* site/blog/
 #/blog/2021-1-25.html turns into site/blog//blog/2021-1-25.html
+exec /dynamic site/build-page.sh
 set host 127.0.0.1:8000
 read / site/easteregg.html
 read /egg.png site/egg.png

src/connections.c

@@ -198,26 +198,7 @@ static int processChar(Connection *conn, char c, Sitefile *site) {
 	}
 	if (conn->progress == RECEIVE_BODY &&
 	    conn->receivedBody >= conn->bodylen)
-		getResponse(conn, site);
-	if (conn->progress == SEND_RESPONSE) {
-		lseek(conn->fd, 0, SEEK_SET);
-		while (conn->len > 0) {
-			char buff[1024];
-			ssize_t readLen = read(conn->fd, buff, sizeof(buff));
-			if (readLen < 0)
-				return 1;
-			ssize_t leftToSend = readLen;
-			while (leftToSend > 0) {
-				size_t writeLen = sendStream(conn->stream,
-						buff, leftToSend);
-				if (writeLen < 0)
-					return 1;
-				leftToSend -= writeLen;
-			}
-			conn->len -= readLen;
-		}
-		resetConnection(conn);
-	}
+		sendResponse(conn, site);
 	return 0;
 }
 

src/include/connections.h

@@ -25,7 +25,6 @@ typedef enum {
 	RECEIVE_REQUEST,
 	RECEIVE_HEADER,
 	RECEIVE_BODY,
-	SEND_RESPONSE,
 } ConnectionSteps;
 
 typedef struct {
@@ -54,10 +53,6 @@ typedef struct Connection {
 	size_t bodylen;
 	size_t receivedBody;
 
-	int fd;
-	size_t len;
-	//the fd and length of the response left to send
-
 	char *currLine;
 	//persistent
 	size_t currLineAlloc;

src/include/responses.h

@@ -20,6 +20,6 @@
 #include <sitefile.h>
 #include <connections.h>
 
-int getResponse(Connection *conn, Sitefile *site);
+int sendResponse(Connection *conn, Sitefile *site);
 //returns 1 on error, sets conn->progress to SEND_RESPONSE and sets conn->fd
 #endif

src/include/sitefile.h

@@ -23,6 +23,7 @@
 
 typedef enum {
 	READ,
+	EXEC,
 } Command;
 
 typedef struct {

src/responses.c

@@ -25,16 +25,29 @@
 #include <limits.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <sys/wait.h>
 
 #include <responses.h>
 #include <responseutil.h>
 
+static int resilientSend(Stream *stream, char *buff, size_t len) {
+//Will either write len bytes, or return 1 for error.
+	while (len > 0) {
+		ssize_t sent = sendStream(stream, buff, len);
+		if (sent < 0)
+			return 1;
+		len -= sent;
+		buff += sent;
+	}
+	return 0;
+}
+
 static int readResponse(Connection *conn, char *path) {
-	int fd = -1;;
+	int fd = 1;
 	struct stat statbuf;
 	if (stat(path, &statbuf)) {
 		sendErrorResponse(conn, ERROR_404);
-		return -1;
+		return 1;
 	}
 	if (S_ISDIR(statbuf.st_mode)) {
 		long reqPathLen = strlen(conn->path);
@@ -50,7 +63,7 @@ static int readResponse(Connection *conn, char *path) {
 			if (errno == ENOENT) {
 				free(assembledPath);
 				sendErrorResponse(conn, ERROR_404);
-				return -1;
+				return 1;
 			}
 			free(assembledPath);
 			goto error;
@@ -75,12 +88,12 @@ static int readResponse(Connection *conn, char *path) {
 		if (stat(requestPath, &requestbuf)) {
 			free(assembledPath);
 			sendErrorResponse(conn, ERROR_404);
-			return -1;
+			return 1;
 		}
 		if (S_ISDIR(requestbuf.st_mode)) {
 			free(assembledPath);
 			sendErrorResponse(conn, ERROR_400);
-			return -1;
+			return 1;
 		}
 
 		fd = open(requestPath, O_RDONLY);
@@ -96,17 +109,100 @@ static int readResponse(Connection *conn, char *path) {
 	if (lseek(fd, 0, SEEK_SET) < 0) {
 		sendErrorResponse(conn, ERROR_500);
 		close(fd);
-		return -1;
+		return 1;
 	}
 	sendHeader(conn, CODE_200, len);
-	conn->len = len;
-	return fd;
+
+	while (len > 0) {
+		char buff[1024];
+		size_t readLen = read(fd, buff, sizeof(buff));
+		if (resilientSend(conn->stream, buff, readLen))
+			goto error;
+		len -= readLen;
+	}
+
+	return 0;
 error:
 	sendErrorResponse(conn, ERROR_500);
-	return -1;
+	return 1;
 forbidden:
 	sendErrorResponse(conn, ERROR_403);
-	return -1;
+	return 1;
+}
+
+static int execResponse(Connection *conn, char *path) {
+	int output[2];
+	if (pipe(output))
+		goto error;
+
+	pid_t pid = fork();
+	if (pid < 0)
+		goto error;
+	if (pid == 0) {
+		close(1);
+		close(output[0]);
+		dup2(output[1], 1);
+		char **args = malloc((conn->fieldCount*2 + 2) * sizeof(char *));
+		if (args == NULL) {
+			close(output[1]);
+			exit(EXIT_FAILURE);
+		}
+		args[0] = path;
+		for (int i = 0; i < conn->fieldCount; i++) {
+			args[i * 2 + 1] = conn->fields[i].field;
+			args[i * 2 + 2] = conn->fields[i].value;
+		}
+		args[conn->fieldCount*2 + 1] = NULL;
+		if (execv(path, args) < 0) {
+			close(output[1]);
+			free(args);
+			exit(EXIT_FAILURE);
+		}
+		close(output[1]);
+		free(args);
+		exit(EXIT_SUCCESS);
+	}
+	size_t allocResponse = 1024;
+	size_t responseLen = 0;
+	char *response = malloc(allocResponse);
+	close(output[1]);
+	for (;;) {
+		if (responseLen == allocResponse) {
+			allocResponse *= 2;
+			char *newresponse = realloc(response, allocResponse);
+			if (newresponse == NULL)
+				goto looperror;
+			response = newresponse;
+		}
+		ssize_t len = read(output[0],
+				response + responseLen,
+				allocResponse - responseLen);
+		if (len < 0)
+			goto looperror;
+		if (len == 0)
+			break;
+		responseLen += len;
+		continue;
+looperror:
+		close(output[0]);
+		int status;
+		waitpid(pid, &status, 0);
+		free(response);
+		goto error;
+	}
+	close(output[0]);
+	int status;
+	waitpid(pid, &status, 0);
+	sendHeader(conn, CODE_200, responseLen);
+	if (resilientSend(conn->stream, response, responseLen)) {
+		free(response);
+		return 1;
+	}
+	free(response);
+	return 0;
+error:
+	sendErrorResponse(conn, ERROR_500);
+	return 1;
 }
 
 static int fullmatch(regex_t *regex, char *str) {
@@ -116,7 +212,7 @@ static int fullmatch(regex_t *regex, char *str) {
 	return match.rm_so != 0 || match.rm_eo != strlen(str);
 }
 
-int getResponse(Connection *conn, Sitefile *site) {
+int sendResponse(Connection *conn, Sitefile *site) {
 	char *host = NULL;
 	for (int i = 0; i < conn->fieldCount; i++) {
 		if (strcmp(conn->fields[i].field, "Host") == 0) {
@@ -134,23 +230,22 @@ int getResponse(Connection *conn, Sitefile *site) {
 		if (fullmatch(&site->content[i].host, host))
 			continue;
 		if (fullmatch(&site->content[i].path, conn->path) == 0) {
-			int fd = -1;
 			switch (site->content[i].command) {
 				case READ:
-					fd = readResponse(conn,
+					readResponse(conn,
 							site->content[i].arg);
 					break;
+				case EXEC:
+					execResponse(conn,
+							site->content[i].arg);
 				default:
 					sendErrorResponse(conn, ERROR_500);
 					return 1;
 			}
-			if (fd == -1)
-				return 1;
-			conn->fd = fd;
-			conn->progress = SEND_RESPONSE;
+			resetConnection(conn);
 			return 0;
 		}
 	}
 	sendErrorResponse(conn, ERROR_404);
-	return -1;
+	return 1;
 }

src/sitefile.c

@@ -258,6 +258,13 @@ Sitefile *parseSitefile(char *path) {
 			ret->content[ret->size].arg = copyString(argv[2]);
 			if (ret->content[ret->size].arg == NULL)
 				goto error;
+			ret->content[ret->size].command = READ;
+		}
+		else if (strcmp(argv[0], "exec") == 0) {
+			ret->content[ret->size].arg = copyString(argv[2]);
+			if (ret->content[ret->size].arg == NULL)
+				goto error;
+			ret->content[ret->size].command = EXEC;
 		}
 		else
 			goto error;