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4900c4cf01edf0a6d2ee4113342e06cbfa6e6701
simple-http-server/server.c
源文雨 4900c4cf01 fix accept
2022-03-04 19:41:27 +08:00

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/* J. David's webserver */
/* This is a simple webserver.
* Created November 1999 by J. David Blackstone.
* CSE 4344(Network concepts), Prof. Zeigler
* University of Texas at Arlington
*
* Modified June 2021 by Fumiama(源文雨)
*/
/* See feature_test_macros(7) */
#define _GNU_SOURCE 1
#include <arpa/inet.h>
#include <ctype.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>
#if !__APPLE__
#include <sys/sendfile.h>
#else
static struct sf_hdtr hdtr;
#endif
#define ISspace(x) isspace((int)(x))
#define SERVER_STRING "Server: TinyHttpd modified by Fumiama/1.0\r\n"
enum METHOD_TYPE {GET, POST};
typedef enum METHOD_TYPE METHOD_TYPE;
struct HTTP_REQUEST {
const char *path;
const char *method;
METHOD_TYPE method_type;
const char *query_string;
};
typedef struct HTTP_REQUEST HTTP_REQUEST;
static void accept_request(void *);
static void bad_request(int);
static void cat(int, FILE *);
static void cannot_execute(int);
static void error_die(const char *);
static void execute_cgi(int, int, const HTTP_REQUEST*);
static uint32_t get_file_size(const char *, int);
static int get_line(int, char *, int);
static void handle_quit(int);
static int headers(int, const char *);
static void not_found(int);
static void serve_file(int, const char *);
static int startup(u_int16_t *);
static int startupunix(char *);
static void unimplemented(int);
/**********************************************************************/
/* A request has caused a call to accept() on the server port to
* return. Process the request appropriately.
* Parameters: the socket connected to the client */
/**********************************************************************/
/* read & discard headers */
#define discard(client) \
while((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf))
#define methodequ(str, method) (*(uint32_t*)(method) == *(uint32_t*)(str))
#define skiptext(buf, j, cap) while(!ISspace(buf[j]) && (j < (cap))) j++
#define skipspace(buf, j, cap) while(ISspace(buf[j]) && (j < (cap))) j++
#define getmethod(method_type) ((method_type == GET)?"GET":"POST")
static void accept_request(void *cli) {
int client = (int)cli;
char buf[1024], *path, *query_string;
int numchars, cgi = 0, j; // cgi becomes true if server decides this is a CGI program
struct stat st;
METHOD_TYPE method_type;
numchars = get_line(client, buf, sizeof(buf));
j = 0;
skiptext(buf, j, numchars - 1);
buf[j] = '\0';
if(methodequ(buf, "GET")) method_type = GET;
else if(methodequ(buf, "POST")) {
cgi = 1;
method_type = POST;
}
skipspace(buf, j, numchars - 1);
path = buf + j + 1;
skiptext(buf, j, numchars - 1);
buf[j] = 0;
if(method_type == GET) {
query_string = path;
while((*query_string != '?') && (*query_string != '\0')) query_string++;
if(*query_string == '?') {
cgi = 1;
*query_string = '\0';
query_string++;
}
}
// skip possible ../
while((*path == '.' || *path == '/' || *path == '#') && *path != 0) path++;
path -= 2;
path[0] = '.'; path[1] = '/';
printf("[%s] <%s> (%s) = ", getmethod(method_type), path, query_string);
// 花括号不可省略
if(stat(path, &st) == -1) {
discard(client);
not_found(client);
} else {
int pathlen = strlen(path) + 1;
char path_stack[pathlen + 11]; // 11 is for possible /index.html
memcpy(path_stack, path, pathlen);
printf("<%d> ", pathlen);
path = path_stack;
int query_length = strlen(query_string) + 1;
char query_string_stack[query_length];
memcpy(query_string_stack, query_string, query_length);
query_string = query_string_stack;
printf("(%d) ", query_length);
if((st.st_mode & S_IFMT) == S_IFDIR) {
strcat(path, "/index.html");
// 花括号不可省略
if(stat(path, &st) == -1) {
discard(client);
not_found(client);
close(client);
return;
}
}
int content_length = 0;
cgi &= ((st.st_mode & S_IXUSR) || (st.st_mode & S_IXGRP) || (st.st_mode & S_IXOTH));
while((numchars > 0) && strcmp("\n", buf)) {
numchars = get_line(client, buf, sizeof(buf));
if(!content_length && strcasestr(buf, "Content-Length: ")) {
content_length = atoi(buf + 16);
}
}
if(method_type == POST && content_length == -1) bad_request(client);
else if(!cgi) serve_file(client, path);
else {
HTTP_REQUEST request;
request.path = path;
request.method = getmethod(method_type);
request.method_type = method_type;
request.query_string = query_string;
execute_cgi(client, content_length, &request);
}
}
close(client);
}
/**********************************************************************/
/* Inform the client that a request it has made has a problem.
* Parameters: client socket */
/**********************************************************************/
#define HTTP400 "HTTP/1.0 400 BAD REQUEST\r\nContent-Type: text/html\r\n\r\n<P>Your browser sent a bad request, such as a POST without a Content-Length.\r\n"
static void bad_request(int client) {
send(client, HTTP400, sizeof(HTTP400)-1, 0);
puts("400 BAD REQUEST.");
}
/**********************************************************************/
/* Put the entire contents of a file out on a socket. This function
* is named after the UNIX "cat" command, because it might have been
* easier just to do something like pipe, fork, and exec("cat").
* Parameters: the client socket descriptor
* FILE pointer for the file to cat */
/**********************************************************************/
static void cat(int client, FILE *resource) {
off_t len = 0;
#if __APPLE__
sendfile(fileno(resource), client, 0, &len, &hdtr, 0);
#else
fseek(resource, 0, SEEK_END);
off_t file_size = ftell(resource);
rewind(resource);
sendfile(client, fileno(resource), &len, file_size);
#endif
printf("Sendfile: %u bytes.\n", (unsigned int)len);
}
/**********************************************************************/
/* Inform the client that a CGI script could not be executed.
* Parameter: the client socket descriptor. */
/**********************************************************************/
#define HTTP500 "HTTP/1.0 500 Internal Server Error\r\nContent-Type: text/html\r\n\r\n<P>Internal Server Error.\r\n"
static void cannot_execute(int client) {
send(client, HTTP500, sizeof(HTTP500)-1, 0);
puts("500 Internal Server Error.");
}
/**********************************************************************/
/* Print out an error message with perror()(for system errors; based
* on value of errno, which indicates system call errors) and exit the
* program indicating an error. */
/**********************************************************************/
static void error_die(const char *sc) {
perror(sc);
exit(1);
}
/**********************************************************************/
/* Execute a CGI script. Will need to set environment variables as
* appropriate.
* Parameters: client socket descriptor
* path to the CGI script */
/**********************************************************************/
static void execute_cgi(int client, int content_length, const HTTP_REQUEST* request) {
int cgi_output[2], cgi_input[2], i;
pid_t pid;
if(pipe(cgi_output) < 0 || pipe(cgi_input) < 0 || (pid = fork()) < 0) cannot_execute(client);
/* child: CGI script */
else if(pid == 0) {
char env[255];
dup2(cgi_output[1], 1);
dup2(cgi_input[0], 0);
close(cgi_output[0]);
close(cgi_input[1]);
sprintf(env, "REQUEST_METHOD=%s", request->method);
putenv(env);
if(request->method_type == GET) {
sprintf(env, "QUERY_STRING=%s", request->query_string);
putenv(env);
}
else { /* POST */
sprintf(env, "CONTENT_LENGTH=%d", content_length);
putenv(env);
}
execl(request->path, request->path, request->method, request->query_string, NULL);
exit(0);
}
else { /* parent */
char buf[1024];
close(cgi_output[1]);
close(cgi_input[0]);
if(request->method_type == POST) {
#if __APPLE__
for(i = 0; i < content_length;) {
int cnt = recv(client, buf, 1024, 0);
if(cnt > 0) {
write(cgi_input[1], buf, cnt);
i += cnt;
} else {
cannot_execute(client);
goto CGI_CLOSE;
}
}
#else
int len = 0;
while(len < content_length) {
int delta = splice(client, NULL, cgi_input[1], NULL, content_length - len, SPLICE_F_GIFT);
if(delta <= 0) {
cannot_execute(client);
goto CGI_CLOSE;
}
len += delta;
}
#endif
}
uint32_t cnt = 0;
char* p = (char*)&cnt;
while(p - (char*)&cnt < sizeof(uint32_t)) {
int offset = read(cgi_output[0], p, sizeof(uint32_t));
if(offset > 0) p += offset;
else {
cannot_execute(client);
goto CGI_CLOSE;
}
}
printf("CGI msg len: %u bytes.\n", cnt);
if(cnt > 0) {
int len = 0;
#if __APPLE__
char* data = malloc(cnt);
while(len < cnt) {
int n = read(cgi_output[0], data, cnt);
if(n <= 0) {
if(data) free(data);
cannot_execute(client);
goto CGI_CLOSE;
}
len += n;
send(client, data, len, 0);
}
if(data) free(data);
#else
while(len < cnt) {
int delta = splice(cgi_output[0], NULL, client, NULL, cnt - len, SPLICE_F_GIFT);
if(delta <= 0) {
cannot_execute(client);
goto CGI_CLOSE;
}
len += delta;
}
#endif
printf("CGI send %d bytes\n", len);
}
CGI_CLOSE:
close(cgi_output[0]);
close(cgi_input[1]);
waitpid(pid, &i, 0);
}
}
/**********************************************************************/
/* Returns the size of a file. */
/* Parameters: path of the file */
/**********************************************************************/
static uint32_t get_file_size(const char *filepath, int client) {
struct stat statbuf;
uint32_t sz;
if(!stat(filepath, &statbuf)) {
sz = statbuf.st_size;
printf("[%u] - ", sz);
return sz;
}
else return 0;
}
/**********************************************************************/
/* Get a line from a socket, whether the line ends in a newline,
* carriage return, or a CRLF combination. Terminates the string read
* with a null character. If no newline indicator is found before the
* end of the buffer, the string is terminated with a null. If any of
* the above three line terminators is read, the last character of the
* string will be a linefeed and the string will be terminated with a
* null character.
* Parameters: the socket descriptor
* the buffer to save the data in
* the size of the buffer
* Returns: the number of bytes stored(excluding null) */
/**********************************************************************/
static int get_line(int sock, char *buf, int size) {
int i = 0;
char c = '\0';
int n;
while((i < size - 1) && (c != '\n')) {
n = recv(sock, &c, 1, 0);
if(n > 0) {
if(c == '\r') {
n = recv(sock, &c, 1, MSG_PEEK);
/* DEBUG printf("%02X\n", c); */
if((n > 0) && (c == '\n')) recv(sock, &c, 1, 0);
else c = '\n';
}
buf[i++] = c;
} else c = '\n';
}
buf[i] = '\0';
return i;
}
/**********************************************************************/
/* Handle thread quit signal */
/**********************************************************************/
static void handle_quit(int signo) {
perror("handle");
pthread_exit(NULL);
}
/**********************************************************************/
/* Return the informational HTTP headers about a file. */
/* Parameters: the socket to print the headers on
* the name of the file */
/**********************************************************************/
#define ADD_HERDER(h)\
strcpy(buf + offset, h);\
offset += sizeof(h) - 1;
#define ADD_HERDER_PARAM(h, p)\
sprintf(buf + offset, h,(p));\
offset += strlen(buf + offset);
#define EXTNM_IS_NOT(name)(strcmp(filepath+extpos, name))
#define HTTP200 "HTTP/1.0 200 OK\r\n"
#define CONTENT_TYPE "Content-Type: %s\r\n"
#define CONTENT_LEN "Content-Length: %d\r\n"
static int headers(int client, const char *filepath) {
char buf[1024];
uint32_t offset = 0;
uint32_t extpos = strlen(filepath) - 4;
uint32_t file_size = get_file_size(filepath, client);
if(file_size) {
ADD_HERDER(HTTP200 SERVER_STRING);
ADD_HERDER_PARAM(CONTENT_TYPE, EXTNM_IS_NOT("html")?(EXTNM_IS_NOT(".css")?(EXTNM_IS_NOT(".ico")?"text/plain":"image/x-icon"):"text/css"):"text/html");
ADD_HERDER_PARAM(CONTENT_LEN "\r\n", file_size);
send(client, buf, offset, 0);
puts("200 OK.");
return 1;
} else return 0;
}
/**********************************************************************/
/* Give a client a 404 not found status message. */
/**********************************************************************/
#define HTTP404 "HTTP/1.0 404 NOT FOUND\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><TITLE>Not Found</TITLE>\r\n<BODY><P>The server could not fulfill\r\nyour request because the resource specified\r\nis unavailable or nonexistent.\r\n</BODY></HTML>\r\n"
static void not_found(int client) {
send(client, HTTP404, sizeof(HTTP404)-1, 0);
puts("404 Not Found.");
}
/**********************************************************************/
/* Send a regular file to the client. Use headers, and report
* errors to client if they occur.
* Parameters: a pointer to a file structure produced from the socket
* file descriptor
* the name of the file to serve */
/**********************************************************************/
static void serve_file(int client, const char *filename) {
FILE *resource = NULL;
resource = fopen(filename, "rb");
if(resource) {
if(headers(client, filename)) cat(client, resource);
else not_found(client);
fclose(resource);
} else not_found(client);
}
/**********************************************************************/
/* This function starts the process of listening for web connections
* on a specified port. If the port is 0, then dynamically allocate a
* port and modify the original port variable to reflect the actual
* port.
* Parameters: pointer to variable containing the port to connect on
* Returns: the socket */
/**********************************************************************/
#ifdef LISTEN_ON_IPV6
static socklen_t struct_len = sizeof(struct sockaddr_in6);
static struct sockaddr_in6 name;
static struct sockaddr_in6 client_name;
#else
static socklen_t struct_len = sizeof(struct sockaddr_in);
static struct sockaddr_in name;
static struct sockaddr_in client_name;
#endif
static int startup(uint16_t *port) {
int httpd = 0;
#ifdef LISTEN_ON_IPV6
name.sin6_family = AF_INET6;
name.sin6_port = htons(*port);
bzero(&(name.sin6_addr), sizeof(name.sin6_addr));
httpd = socket(PF_INET6, SOCK_STREAM, 0);
#else
name.sin_family = AF_INET;
name.sin_port = htons(*port);
name.sin_addr.s_addr = INADDR_ANY;
bzero(&(name.sin_zero), 8);
httpd = socket(AF_INET, SOCK_STREAM, 0);
#endif
if(httpd < 0) error_die("socket");
if(bind(httpd,(struct sockaddr *)&name, struct_len) < 0) error_die("bind");
/* if dynamically allocating a port */
if(*port == 0) {
if(getsockname(httpd,(struct sockaddr *)&name, &struct_len) == -1) error_die("getsockname");
#ifdef LISTEN_ON_IPV6
*port = ntohs(name.sin6_port);
#else
*port = ntohs(name.sin_port);
#endif
}
if(listen(httpd, 5) < 0) error_die("listen");
return httpd;
}
static struct sockaddr_un uname;
static struct sockaddr_un uclient_name;
static int startupunix(char *path) {
int httpd = socket(AF_UNIX, SOCK_STREAM, 0);
uname.sun_family = AF_UNIX;
strncpy(uname.sun_path, path, sizeof(uname.sun_path));
uname.sun_path[sizeof(uname.sun_path)-1] = 0; // avoid overlap
#if __APPLE__
uname.sun_len = strlen(path)+1; // including null
#else
int sun_len = strlen(path);
#endif
if(httpd < 0) error_die("unix socket");
unlink(path); // in case it already exists
if(bind(
httpd,
(struct sockaddr *)&uname,
(void*)uname.sun_path-(void*)&uname+
#if __APPLE__
uname.sun_len
#else
sun_len
#endif
) < 0) error_die("bind");
if(listen(httpd, 5) < 0) error_die("listen");
return httpd;
}
/**********************************************************************/
/* Inform the client that the requested web method has not been
* implemented.
* Parameter: the client socket */
/**********************************************************************/
#define HTTP501 "HTTP/1.0 501 Method Not Implemented\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>Method Not Implemented\r\n</TITLE></HEAD>\r\n<BODY><P>HTTP request method not supported.\r\n</BODY></HTML>\r\n"
static void unimplemented(int client) {
send(client, HTTP501, sizeof(HTTP501)-1, 0);
puts("501 Method Not Implemented.");
}
/************************************************************************/
/* simple-http-server
* Usage: simple-http-server [-d] [-p <port>] [-r <rootdir>] [-u <uid>] */
/************************************************************************/
static pthread_attr_t attr;
static pthread_t accept_thread;
static int accept_client(int server_sock, int is_unix_sock) {
socklen_t client_name_len = is_unix_sock?sizeof(uclient_name):sizeof(client_name);
signal(SIGCHLD, SIG_IGN);
signal(SIGQUIT, handle_quit);
signal(SIGPIPE, handle_quit);
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, 1);
while(1) {
int client_sock = accept(server_sock, (struct sockaddr *)(is_unix_sock?&uclient_name:&client_name), &client_name_len);
if(client_sock <= 0) {
puts("Failed to accept a client, continue...");
continue;
}
if(is_unix_sock) {
uclient_name.sun_path[sizeof(uclient_name.sun_path)-1] = 0;
printf("Accept client %s\n", uclient_name.sun_path);
}
else {
#ifdef LISTEN_ON_IPV6
uint16_t port = ntohs(client_name.sin6_port);
struct in6_addr in = client_name.sin6_addr;
char str[INET6_ADDRSTRLEN]; // 46
inet_ntop(AF_INET6, &in, str, sizeof(str));
#else
uint16_t port = ntohs(client_name.sin_port);
struct in_addr in = client_name.sin_addr;
char str[INET_ADDRSTRLEN]; // 16
inet_ntop(AF_INET, &in, str, sizeof(str));
#endif
printf("Accept client %s:%u\n", str, port);
}
if(pthread_create(&accept_thread, &attr, &accept_request, client_sock) != 0) perror("pthread_create");
}
}
#define argequ(arg) (*(uint16_t*)argv[i] == *(uint16_t*)(arg))
#define USAGE "Usage:\tsimple-http-server [-h] [-d] [-p <port|unix socket path>] [-r <rootdir>] [-u <uid>]\n -h:\tdisplay this help.\n -d:\trun as daemon.\n -p:\tif not set, we will choose a random port.\n -r:\thttp root dir.\n -u:\trun as this uid."
int main(int argc, char **argv) {
if(argc > 8) puts(USAGE);
else {
int as_daemon = 0;
uint16_t port = 0;
char* socket_path = NULL;
char *cdir = "./";
uid_t uid = -1;
int server_sock = -1;
int pid = -1;
for(int i = 1; i < argc; i++) {
if(!as_daemon && argequ("-d")) as_daemon = 1;
else if(argequ("-p")) {
i++;
if(isdigit(argv[i][0])) port = (uint16_t)atoi(argv[i]);
else socket_path = argv[i];
}
else if(argequ("-r")) cdir = argv[++i];
else if(argequ("-u")) uid = atoi(argv[++i]);
else if(argequ("-h")) {
puts(USAGE);
exit(EXIT_SUCCESS);
}
else {
printf("unknown argument: %s\n", argv[i]);
puts(USAGE);
exit(EXIT_FAILURE);
}
}
if(chdir(cdir)) error_die("chdir");
server_sock = (!port&&socket_path)?startupunix(socket_path):startup(&port);
if(port) printf("httpd running on 0.0.0.0:%d at %s\n", port, cdir);
else printf("httpd running on %s at %s\n", socket_path, cdir);
if(as_daemon) {
if(uid > 0) {
setuid(uid);
setgid(uid);
}
pid = fork();
if(pid == 0) pid = fork();
else return 0;
while(pid > 0) { // 主进程监控子进程状态，如果子进程异常终止则重启之
wait(NULL);
puts("Server subprocess exited. Restart...");
pid = fork();
}
if(pid < 0) perror("fork");
else accept_client(server_sock, !port);
} else accept_client(server_sock, !port);
}
}
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