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https://github.com/sigmasternchen/CFloor
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cgi handler nearly finished
This commit is contained in:
overflowerror
parent
e404b423de
commit
5fe0874c5c
3 changed files with 233 additions and 1 deletions
2
Makefile
2
Makefile
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@ -5,7 +5,7 @@ LDFLAGS = -lpthread -lrt
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BIN_NAME = cfloor
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OBJS = obj/networking.o obj/linked.o obj/logging.o obj/signals.o obj/headers.o obj/misc.o obj/status.o obj/files.o obj/mime.o
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OBJS = obj/networking.o obj/linked.o obj/logging.o obj/signals.o obj/headers.o obj/misc.o obj/status.o obj/files.o obj/mime.o obj/cgi.o
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DEPS = $(OBJS:%.o=%.d)
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all: $(BIN_NAME)
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220
src/cgi.c
220
src/cgi.c
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@ -0,0 +1,220 @@
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <sys/wait.h>
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#include "cgi.h"
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#include "misc.h"
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#include "files.h"
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#include "status.h"
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#include "logging.h"
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#include "headers.h"
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#define EXIT_EXEC_FAILED (255)
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static inline void setEnvStatic(const char* envname, const char* value) {
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if (setenv(envname, value, true) < 0)
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exit(EXIT_EXEC_FAILED);
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}
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static inline void setEnvFromHeader(struct headers* headers, const char* envname, const char* headerKey) {
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const char* tmp = headers_get(headers, headerKey);
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setEnvStatic(envname, tmp == NULL ? "" : tmp);
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}
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void cgiHandler(struct request request, struct response response) {
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struct cgiSettings* settings = (struct cgiSettings*) request.userData.ptr;
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const char* documentRoot = settings->documentRoot;
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char* path = normalizePath(request, response, documentRoot);
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if (path == NULL)
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return;
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if (access(path, F_OK | X_OK) < 0) {
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free(path);
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switch(errno) {
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case EACCES:
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warn("cgi: file is not executable");
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status(request, response, 403);
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return;
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default:
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// this should not happen
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error("cgi: Couldn't access file: %s", strerror(errno));
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status(request, response, 500);
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return;
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}
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}
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int pipefd[2];
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if (pipe(&(pipefd[0])) < 0) {
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error("cgi: failed to create pipe: %s", strerror(errno));
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status(request, response, 500);
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free(path);
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return;
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}
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pid_t pid = fork();
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if (pid < 0) {
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error("cgi: failed to fork: %s", strerror(errno));
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status(request, response, 500);
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} else if (pid > 0) {
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// child
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// logging is thread-only
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// so no logging from here on out.
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if (dup2(request.fd, 0) < 0) {
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exit(EXIT_EXEC_FAILED);
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}
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if (dup2(pipefd[1], 1) < 0) {
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exit(EXIT_EXEC_FAILED);
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}
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struct headers* headers = request.headers;
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setEnvStatic("GATEWAY_INTERFACE", "CGI/1.1");
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setEnvStatic("DOCUMENT_ROOT", documentRoot);
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setEnvStatic("HTTPS", request.bind.tls ? "on" : "off");
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setEnvStatic("QUERY_STRING", request.metaData.queryString);
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setEnvStatic("REQUEST_METHOD", methodString(request.metaData));
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setEnvStatic("REQUEST_URI", request.metaData.uri);
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setEnvStatic("REMOTE_ADDR", request.peer.addr);
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setEnvStatic("REMOTE_HOST", request.peer.name);
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setEnvStatic("REMOTE_PORT", request.peer.portStr);
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setEnvStatic("SCRIPT_NAME", request.metaData.path);
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setEnvStatic("SERVER_PROTOCOL", protocolString(request.metaData));
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setEnvStatic("SERVER_NAME", ""); // TODO maybe bind addr?
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setEnvStatic("SERVER_ADMIN", ""); // TODO
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setEnvStatic("SERVER_ADDR", ""); // TODO
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setEnvStatic("SERVER_PORT", ""); // TODO
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setEnvStatic("SERVER_SIGNATURE", ""); // TODO
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setEnvStatic("SERVER_SOFTWARE", ""); // TODO
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setEnvStatic("REDIRECT_REMOTE_USER", ""); // TODO not implemented
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setEnvStatic("REMOTE_USER", ""); // TODO not implemented
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setEnvFromHeader(headers, "HTTP_ACCEPT_CHARSET", "Accept-Charset");
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setEnvFromHeader(headers, "HTTP_ACCEPT_ENCODING", "Accept-Encoding");
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setEnvFromHeader(headers, "HTTP_ACCEPT_LANGUAGE", "Accept-Language");
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setEnvFromHeader(headers, "HTTP_CONNECTION", "Accept-Connection");
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setEnvFromHeader(headers, "HTTP_ACCEPT", "Accept");
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setEnvFromHeader(headers, "HTTP_HOST", "Host");
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setEnvFromHeader(headers, "HTTP_USER_AGENT", "User-Agent");
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setEnvFromHeader(headers, "HTTP_COOKIE", "Cookie");
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setEnvFromHeader(headers, "CONTENT_TYPE", "Content-Type");
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setEnvFromHeader(headers, "CONTENT_LENGTH", "Content-Length");
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execl(path, path, NULL);
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exit(EXIT_EXEC_FAILED);
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} else {
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// parent
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info("cgi: child started successfully");
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#define LOCAL_BUFFER_LENGTH (512)
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char buffer[LOCAL_BUFFER_LENGTH];
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int bufferIndex = 0;
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int statusCode = 0;
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bool wasLineEnd = false;
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bool finished = false;
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struct headers headers = headers_create();
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char c;
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while((read(pipefd[0], &c, 1)) > 0) {
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bool malformed = false;
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if (bufferIndex >= LOCAL_BUFFER_LENGTH - 1)
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malformed = true;
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else if (c == '\r')
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continue;
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else if (c == '\n') {
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if (wasLineEnd) {
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finished = true;
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break;
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}
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buffer[bufferIndex] = '\0';
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bufferIndex = 0;
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if (statusCode == 0) {
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char* endptr;
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statusCode = strtol(&(buffer[0]), &endptr, 10);
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if (endptr != '\0') {
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malformed = true;
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}
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} else {
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if (headers_parse(&headers, &(buffer[0]), bufferIndex) < 0) {
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malformed = true;
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}
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}
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wasLineEnd = true;
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} else {
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wasLineEnd = false;
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buffer[bufferIndex++] = c;
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}
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if (malformed) {
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error("cgi: response malformed");
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finished = false;
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break;
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}
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}
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if (!finished) {
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error("cgi: error while reading header");
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kill(pid, SIGTERM);
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waitpid(pid, &statusCode, 0);
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close(pipefd[0]);
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close(pipefd[1]);
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status(request, response, 500);
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free(path);
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headers_free(&headers);
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return;
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}
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close(pipefd[0]);
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int fd = response.sendHeader(statusCode, &headers, &request);
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headers_free(&headers);
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// start copy thread
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free(path);
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if (waitpid(pid, &statusCode, 0) < 1) {
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error("cgi: error while waiting for child: %s", strerror(errno));
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status(request, response, 500);
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free(path);
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return;
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}
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// WIFEXISTED has to be true
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statusCode = WEXITSTATUS(statusCode);
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if (statusCode == EXIT_EXEC_FAILED) {
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error("cgi: child exit code indicates that exec failed");
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status(request, response, 500);
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return;
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}
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}
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}
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12
src/cgi.h
12
src/cgi.h
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@ -0,0 +1,12 @@
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#ifndef CGI_H
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#define CGI_H
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#include "misc.h"
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struct cgiSettings {
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const char* documentRoot;
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};
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void cgiHandler(struct request, struct response);
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#endif
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