401 lines
10 KiB
C
401 lines
10 KiB
C
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/*
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* This is a quick and dirty HTTP server that uses PhysicsFS to retrieve
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* files. It is not robust at all, probably buggy, and definitely poorly
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* designed. It's just meant to show that it can be done.
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*
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* Basically, you compile this code, and run it:
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* ./physfshttpd archive1.zip archive2.zip /path/to/a/real/dir etc...
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*
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* The files are appended in order to the PhysicsFS search path, and when
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* a client request comes in, it looks for the file in said search path.
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*
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* My goal was to make this work in less than 300 lines of C, so again, it's
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* not to be used for any serious purpose. Patches to make this application
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* suck less will be readily and gratefully accepted.
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*
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* Command line I used to build this on Linux:
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* gcc -Wall -Werror -g -o bin/physfshttpd extras/physfshttpd.c -lphysfs
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*
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* License: this code is public domain. I make no warranty that it is useful,
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* correct, harmless, or environmentally safe.
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*
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* This particular file may be used however you like, including copying it
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* verbatim into a closed-source project, exploiting it commercially, and
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* removing any trace of my name from the source (although I hope you won't
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* do that). I welcome enhancements and corrections to this file, but I do
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* not require you to send me patches if you make changes. This code has
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* NO WARRANTY.
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*
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* Unless otherwise stated, the rest of PhysicsFS falls under the zlib license.
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* Please see LICENSE.txt in the root of the source tree.
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*
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* This file was written by Ryan C. Gordon. (icculus@icculus.org).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifndef LACKING_SIGNALS
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#include <signal.h>
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#endif
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#ifndef LACKING_PROTOENT
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#include <netdb.h>
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#endif
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#include "physfs.h"
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#define DEFAULT_PORTNUM 8080
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typedef struct
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{
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int sock;
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struct sockaddr *addr;
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socklen_t addrlen;
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} http_args;
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#define txt404 \
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"HTTP/1.0 404 Not Found\n" \
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"Connection: close\n" \
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"Content-Type: text/html; charset=utf-8\n" \
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"\n" \
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"<html><head><title>404 Not Found</title></head>\n" \
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"<body>Can't find '%s'.</body></html>\n\n" \
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#define txt200 \
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"HTTP/1.0 200 OK\n" \
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"Connection: close\n" \
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"Content-Type: %s\n" \
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"\n"
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static const char *lastError(void)
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{
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return PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode());
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} /* lastError */
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static int writeAll(const char *ipstr, const int sock, void *buf, const size_t len)
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{
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if (write(sock, buf, len) != len)
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{
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printf("%s: Write error to socket.\n", ipstr);
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return 0;
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} /* if */
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return 1;
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} /* writeAll */
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static int writeString(const char *ipstr, const int sock, const char *fmt, ...)
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{
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/* none of this is robust against large strings or HTML escaping. */
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char buffer[1024];
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int len;
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va_list ap;
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va_start(ap, fmt);
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len = vsnprintf(buffer, sizeof (buffer), fmt, ap);
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va_end(ap);
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if (len < 0)
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{
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printf("uhoh, vsnprintf() failed!\n");
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return 0;
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} /* if */
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return writeAll(ipstr, sock, buffer, len);
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} /* writeString */
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static void feed_file_http(const char *ipstr, int sock, const char *fname)
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{
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PHYSFS_File *in = PHYSFS_openRead(fname);
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if (in == NULL)
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{
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printf("%s: Can't open [%s]: %s.\n", ipstr, fname, lastError());
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writeString(ipstr, sock, txt404, fname);
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return;
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} /* if */
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/* !!! FIXME: mimetype */
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if (writeString(ipstr, sock, txt200, "text/plain; charset=utf-8"))
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{
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do
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{
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char buffer[1024];
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PHYSFS_sint64 br = PHYSFS_readBytes(in, buffer, sizeof (buffer));
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if (br == -1)
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{
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printf("%s: Read error: %s.\n", ipstr, lastError());
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break;
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} /* if */
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else if (!writeAll(ipstr, sock, buffer, (size_t) br))
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{
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break;
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} /* else if */
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} while (!PHYSFS_eof(in));
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} /* if */
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PHYSFS_close(in);
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} /* feed_file_http */
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static void feed_dirlist_http(const char *ipstr, int sock,
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const char *dname, char **list)
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{
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int i;
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if (!writeString(ipstr, sock, txt200, "text/html; charset=utf-8"))
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return;
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else if (!writeString(ipstr, sock,
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"<html><head><title>Directory %s</title></head>"
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"<body><p><h1>Directory %s</h1></p><p><ul>\n",
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dname, dname))
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return;
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if (strcmp(dname, "/") == 0)
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dname = "";
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for (i = 0; list[i]; i++)
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{
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const char *fname = list[i];
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if (!writeString(ipstr, sock,
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"<li><a href='%s/%s'>%s</a></li>\n", dname, fname, fname))
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break;
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} /* for */
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writeString(ipstr, sock, "</ul></body></html>\n");
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} /* feed_dirlist_http */
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static void feed_dir_http(const char *ipstr, int sock, const char *dname)
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{
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char **list = PHYSFS_enumerateFiles(dname);
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if (list == NULL)
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{
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printf("%s: Can't enumerate directory [%s]: %s.\n",
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ipstr, dname, lastError());
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writeString(ipstr, sock, txt404, dname);
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return;
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} /* if */
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feed_dirlist_http(ipstr, sock, dname, list);
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PHYSFS_freeList(list);
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} /* feed_dir_http */
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static void feed_http_request(const char *ipstr, int sock, const char *fname)
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{
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PHYSFS_Stat statbuf;
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printf("%s: requested [%s].\n", ipstr, fname);
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if (!PHYSFS_stat(fname, &statbuf))
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{
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printf("%s: Can't stat [%s]: %s.\n", ipstr, fname, lastError());
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writeString(ipstr, sock, txt404, fname);
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return;
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} /* if */
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if (statbuf.filetype == PHYSFS_FILETYPE_DIRECTORY)
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feed_dir_http(ipstr, sock, fname);
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else
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feed_file_http(ipstr, sock, fname);
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} /* feed_http_request */
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static void *do_http(void *_args)
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{
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http_args *args = (http_args *) _args;
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char ipstr[128];
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char buffer[512];
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char *ptr;
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strncpy(ipstr, inet_ntoa(((struct sockaddr_in *) args->addr)->sin_addr),
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sizeof (ipstr));
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ipstr[sizeof (ipstr) - 1] = '\0';
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printf("%s: connected.\n", ipstr);
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read(args->sock, buffer, sizeof (buffer));
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buffer[sizeof (buffer) - 1] = '\0';
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ptr = strchr(buffer, '\n');
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if (!ptr)
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printf("%s: potentially bogus request.\n", ipstr);
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else
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{
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*ptr = '\0';
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ptr = strchr(buffer, '\r');
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if (ptr != NULL)
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*ptr = '\0';
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if ((toupper(buffer[0]) == 'G') &&
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(toupper(buffer[1]) == 'E') &&
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(toupper(buffer[2]) == 'T') &&
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(toupper(buffer[3]) == ' ') &&
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(toupper(buffer[4]) == '/'))
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{
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ptr = strchr(buffer + 5, ' ');
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if (ptr != NULL)
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*ptr = '\0';
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feed_http_request(ipstr, args->sock, buffer + 4);
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} /* if */
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} /* else */
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/* !!! FIXME: Time the transfer. */
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printf("%s: closing connection.\n", ipstr);
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close(args->sock);
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free(args->addr);
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free(args);
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return NULL;
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} /* do_http */
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static void serve_http_request(int sock, struct sockaddr *addr,
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socklen_t addrlen)
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{
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http_args *args = (http_args *) malloc(sizeof (http_args));
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if (args == NULL)
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{
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printf("out of memory.\n");
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return;
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} /* if */
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args->addr = (struct sockaddr *) malloc(addrlen);
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if (args->addr == NULL)
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{
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free(args);
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printf("out of memory.\n");
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return;
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} /* if */
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args->sock = sock;
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args->addrlen = addrlen;
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memcpy(args->addr, addr, addrlen);
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/* !!! FIXME: optionally spin a thread... */
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do_http((void *) args);
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} /* server_http_request */
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static int create_listen_socket(short portnum)
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{
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int retval = -1;
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int protocol = 0; /* pray this is right. */
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#ifndef LACKING_PROTOENT
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struct protoent *prot;
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setprotoent(0);
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prot = getprotobyname("tcp");
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if (prot != NULL)
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protocol = prot->p_proto;
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#endif
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retval = socket(PF_INET, SOCK_STREAM, protocol);
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if (retval >= 0)
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{
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struct sockaddr_in addr;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(portnum);
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addr.sin_addr.s_addr = INADDR_ANY;
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if ((bind(retval, (struct sockaddr *) &addr, (socklen_t) sizeof (addr)) == -1) ||
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(listen(retval, 5) == -1))
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{
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close(retval);
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retval = -1;
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} /* if */
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} /* if */
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return retval;
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} /* create_listen_socket */
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static int listensocket = -1;
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void at_exit_cleanup(void)
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{
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/*
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* !!! FIXME: If thread support, signal threads to terminate and
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* !!! FIXME: wait for them to clean up.
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*/
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if (listensocket >= 0)
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close(listensocket);
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if (!PHYSFS_deinit())
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printf("PHYSFS_deinit() failed: %s\n", lastError());
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} /* at_exit_cleanup */
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int main(int argc, char **argv)
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{
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int i;
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int portnum = DEFAULT_PORTNUM;
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setbuf(stdout, NULL);
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setbuf(stderr, NULL);
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#ifndef LACKING_SIGNALS
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/* I'm not sure if this qualifies as a cheap trick... */
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signal(SIGTERM, exit);
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signal(SIGINT, exit);
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signal(SIGFPE, exit);
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signal(SIGSEGV, exit);
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signal(SIGPIPE, exit);
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signal(SIGILL, exit);
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#endif
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if (argc == 1)
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{
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printf("USAGE: %s <archive1> [archive2 [... archiveN]]\n", argv[0]);
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return 42;
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} /* if */
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if (!PHYSFS_init(argv[0]))
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{
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printf("PHYSFS_init() failed: %s\n", lastError());
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return 42;
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} /* if */
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/* normally, this is bad practice, but oh well. */
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atexit(at_exit_cleanup);
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for (i = 1; i < argc; i++)
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{
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if (!PHYSFS_mount(argv[i], NULL, 1))
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printf(" WARNING: failed to add [%s] to search path.\n", argv[i]);
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} /* else */
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listensocket = create_listen_socket(portnum);
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if (listensocket < 0)
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{
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printf("listen socket failed to create.\n");
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return 42;
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} /* if */
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while (1) /* infinite loop for now. */
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{
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struct sockaddr addr;
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socklen_t len;
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int s = accept(listensocket, &addr, &len);
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if (s < 0)
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{
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printf("accept() failed: %s\n", strerror(errno));
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||
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|
close(listensocket);
|
||
|
|
return 42;
|
||
|
|
} /* if */
|
||
|
|
|
||
|
|
serve_http_request(s, &addr, len);
|
||
|
|
} /* while */
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
} /* main */
|
||
|
|
|
||
|
|
/* end of physfshttpd.c ... */
|
||
|
|
|