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sws.c
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sws.c
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/*
* MIT License
*
* Copyright (c) 2019 Marco Lucidi
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <getopt.h>
#include <netdb.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#define USAGE "usage: sws -aprihv\n\n" \
"Simple Small Static Stupid Whatever Web Server\n\n" \
" -a bind address, default all interfaces\n" \
" -p port, default 8080\n" \
" -r rootpath, default current working directory\n" \
" -i index page file name, default index.html\n" \
" -h help message\n" \
" -v version\n\n" \
"repo: https://github.com/MarcoLucidi01/sws"
#define VERSION "0.6.0"
#define DEFAULTADDRESS NULL /* to get wildcard address from getaddrinfo() if address (-a) is not specified */
#define DEFAULTPORT "8080"
#define DEFAULTROOTPATH "." /* current working directory */
#define DEFAULTINDEX "index.html"
#define BACKLOG 10 /* backlog argument for listen() syscall */
#define CONNTIMEOUT 30 /* seconds a connection is allowed to remain in idle */
#define CONNMAXREQS 200 /* max number of requests allowed on a single connection */
#define METHODMAX 8 /* request method max size */
#define URIMAX 8192 /* request uri max size */
#define HEADERMAX 4096 /* single request header max size */
#define MAXHEADERS 100 /* max number of request headers allowed */
#define HDATEFMT "%a, %d %b %Y %H:%M:%S GMT" /* http date format for strftime */
#define DATEMAX 64 /* size for date buffers (both log and http) */
#define INET6_PORTSTRLEN 6 /* like INET6_ADDRSTRLEN but for port */
#define BUFCHUNK 256 /* minimum buffer capacity increment */
#define ARRAYLEN(a) (sizeof((a)) / sizeof((a)[0]))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define SAFEPRI(s) ((s) != NULL ? (s) : "NULL")
typedef struct Buffer Buffer;
typedef struct Args Args;
typedef struct Server Server;
typedef struct HRange HRange;
typedef struct HRequest HRequest;
typedef struct HResponse HResponse;
typedef struct HConnection HConnection;
typedef struct MimeType MimeType;
typedef struct sockaddr_storage SockaddrStorage;
struct Buffer /* autogrowing characters buffer */
{
size_t cap;
size_t len;
char *data;
};
struct Args /* command line arguments */
{
const char *address;
const char *port;
const char *rootpath;
const char *index;
int help;
int version;
};
struct Server /* server runtime informations */
{
int sock; /* server listening socket */
volatile sig_atomic_t running; /* 1 if running, 0 if stopped */
char *rootpath; /* current working directory absolute path */
const char *index; /* index filename for directories requests */
};
struct HRange /* http range header first value */
{
long start; /* range start. -1 if -nnn */
long end; /* range end. -1 if nnn- */
};
struct HRequest /* http request aka req */
{
time_t timestamp; /* request arrival timestamp */
char method[METHODMAX];
char *uri; /* decoded request uri */
int keepalive; /* connection header (1 keep-alive, 0 close) */
char ifmodsince[DATEMAX]; /* if modified since header value */
HRange range;
};
struct HResponse /* http response aka resp */
{
int status; /* response http status */
Buffer headers; /* buffer for response headers */
Buffer content; /* buffer for generated responses */
FILE *file; /* file to send as response or NULL if sending generated response */
long filesize; /* size of resp.file taken from stat */
size_t bsent; /* number of payload bytes sent to client */
};
struct HConnection /* http connection aka conn */
{
SockaddrStorage addr; /* client address */
FILE *in; /* input stream */
FILE *out; /* output stream */
int reqsleft; /* number of remaining requests allowed on this connection */
HRequest req; /* current request */
HResponse resp; /* current response */
Buffer buf; /* common reusable buffer used e.g. for building file paths */
};
struct MimeType /* mime type pair stored in table */
{
const char *ext; /* file extension used for searching in table */
const char *mime; /* mime type string */
};
static void parseargs(Args *, int, char *const *);
static void initsrv(const Args *);
static void setupsock(const Args *);
static void setuprootpath(const Args *);
static void setupsighandlers(void);
static void stop(int);
static void logsrvinfo(void);
static void ssinetntop(const SockaddrStorage *, char *, char *);
static void run(void);
static void handlereq(int);
static HConnection *hopen(int);
static int setsocktimeout(int, time_t);
static void hclear(HConnection *);
static void hclose(HConnection *);
static int isalive(HConnection *);
static int recvreq(HConnection *);
static int parsemethod(HConnection *);
static int parseuri(HConnection *);
static int parseversion(HConnection *);
static int parseheaders(HConnection *);
static void parseconnection(HConnection *, const char *);
static void parseifmodsince(HConnection *, const char *);
static void parserange(HConnection *, const char *);
static int buildresp(HConnection *);
static int buildresperror(HConnection *, int);
static int buildrespfile(HConnection *, const char *, const struct stat *);
static int buildrespdir(HConnection *, const char *);
static int scandirfilter(const struct dirent *);
static int scandircmp(const struct dirent **, const struct dirent **);
static int buildrespdirlist(HConnection *, const char *, struct dirent **, int);
static int sendresp(HConnection *);
static int fixhrange(HRange *, long);
static int hprintf(HConnection *, const char *, ...);
static int addheader(HConnection *, const char *, const char *, ...);
static char *uridecode(char *);
static char *uriencode(const char *, char *, size_t);
static char *time2hdate(time_t, char *);
static const char *parsemimetype(const char *, FILE *);
static int mimetypecmp(const void *, const void *);
static void logconnection(const HConnection *);
static char *strtrim(char *);
static const char *strstatus(int);
static void logerror(const char *, ...);
static void vlogerror(const char *, va_list);
static void die(const char *, ...);
static void cleanup(void);
static void bufinit(Buffer *);
static int bufputs(Buffer *, const char *);
static int bufputc(Buffer *, int);
static int bufvprintf(Buffer *, const char *, va_list, va_list);
static int bufreserve(Buffer *, size_t);
static size_t bufavailable(Buffer *);
static void bufclear(Buffer *);
static void buftruncate(Buffer *, size_t);
static void bufdeinit(Buffer *);
static MimeType mimetypes[] = /* keep sorted by extension */
{
{ "3g2", "video/3gpp2" },
{ "3gp", "video/3gpp" },
{ "7z", "application/x-7z-compressed" },
{ "aac", "audio/aac" },
{ "abw", "application/x-abiword" },
{ "arc", "application/x-freearc" },
{ "avi", "video/avi" },
{ "bin", "application/octet-stream" },
{ "bmp", "image/bmp" },
{ "bz", "application/x-bzip" },
{ "bz2", "application/x-bzip2" },
{ "csh", "application/x-csh" },
{ "css", "text/css" },
{ "csv", "text/csv" },
{ "doc", "application/msword" },
{ "docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document" },
{ "epub", "application/epub+zip" },
{ "gif", "image/gif" },
{ "gz", "application/gzip" },
{ "htm", "text/html" },
{ "html", "text/html" },
{ "ico", "image/vnd.microsoft.icon" },
{ "ics", "text/calendar" },
{ "jar", "application/java-archive" },
{ "jpeg", "image/jpeg" },
{ "jpg", "image/jpeg" },
{ "js", "application/javascript" },
{ "json", "application/json" },
{ "jsonld", "application/ld+json" },
{ "mid", "audio/midi" },
{ "midi", "audio/midi" },
{ "mjs", "application/javascript" },
{ "mp3", "audio/mpeg" },
{ "mp4", "video/mp4" },
{ "mpeg", "video/mpeg" },
{ "odp", "application/vnd.oasis.opendocument.presentation" },
{ "ods", "application/vnd.oasis.opendocument.spreadsheet" },
{ "odt", "application/vnd.oasis.opendocument.text" },
{ "oga", "audio/ogg" },
{ "ogv", "video/ogg" },
{ "ogx", "application/ogg" },
{ "otf", "font/otf" },
{ "pdf", "application/pdf" },
{ "php", "application/php" },
{ "png", "image/png" },
{ "ppt", "application/vnd.ms-powerpoint" },
{ "pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation" },
{ "rar", "application/x-rar-compressed" },
{ "rtf", "application/rtf" },
{ "sh", "application/x-sh" },
{ "svg", "image/svg+xml" },
{ "swf", "application/x-shockwave-flash" },
{ "tar", "application/x-tar" },
{ "tif", "image/tiff" },
{ "tiff", "image/tiff" },
{ "ts", "video/mp2t" },
{ "ttf", "font/ttf" },
{ "txt", "text/plain" },
{ "vsd", "application/vnd.visio" },
{ "wav", "audio/wav" },
{ "weba", "audio/webm" },
{ "webm", "video/webm" },
{ "webp", "image/webp" },
{ "woff", "font/woff" },
{ "woff2", "font/woff2" },
{ "xhtml", "application/xhtml+xml" },
{ "xls", "application/vnd.ms-excel" },
{ "xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" },
{ "xml", "application/xml" },
{ "zip", "application/zip" },
};
static Server server = { -1, 0, NULL, NULL }; /* global server runtime informations */
int main(int argc, char **argv)
{
Args args;
parseargs(&args, argc, argv);
if (args.help)
die(USAGE);
if (args.version)
die(VERSION);
initsrv(&args);
logsrvinfo();
run();
cleanup();
return 0;
}
static void parseargs(Args *args, int argc, char *const *argv)
{
int opt;
args->address = DEFAULTADDRESS;
args->port = DEFAULTPORT;
args->rootpath = DEFAULTROOTPATH;
args->index = DEFAULTINDEX;
args->help = 0;
args->version = 0;
while ((opt = getopt(argc, argv, "a:p:r:i:hv")) != -1) {
switch (opt) {
case 'a':
args->address = optarg;
break;
case 'p':
args->port = optarg;
break;
case 'r':
args->rootpath = optarg;
break;
case 'i':
args->index = optarg;
break;
case 'h':
args->help = 1;
break;
case 'v':
args->version = 1;
break;
default:
die(USAGE);
break;
}
}
}
static void initsrv(const Args *args)
{
setvbuf(stdout, NULL, _IOLBF, 0); /* line buffer even when stdout is not a terminal */
setupsock(args);
setuprootpath(args);
setupsighandlers();
server.index = args->index;
}
static void setupsock(const Args *args)
{
struct addrinfo hints, *info, *p;
int err, yes = 1;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
err = getaddrinfo(args->address, args->port, &hints, &info);
if (err)
die("getaddrinfo(\"%s\", \"%s\"): %s", SAFEPRI(args->address), args->port, gai_strerror(err));
for (p = info; p != NULL; p = p->ai_next) {
server.sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (server.sock == -1)
continue;
if (setsockopt(server.sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) {
close(server.sock);
continue;
}
if (bind(server.sock, p->ai_addr, p->ai_addrlen) == -1) {
close(server.sock);
continue;
}
if (listen(server.sock, BACKLOG) == -1) {
close(server.sock);
continue;
}
break;
}
freeaddrinfo(info);
if (p == NULL)
die("failed to bind socket using address \"%s\" and port \"%s\"", SAFEPRI(args->address), args->port);
}
static void setuprootpath(const Args *args)
{
Buffer buf;
if (chdir(args->rootpath) != 0)
die("chdir(\"%s\"): %s", args->rootpath, strerror(errno));
bufinit(&buf);
for (;;) {
if (bufreserve(&buf, buf.cap + BUFCHUNK) == -1)
die("bufreserve(): %s", strerror(errno));
server.rootpath = buf.data;
if (getcwd(server.rootpath, buf.cap))
break;
if (errno != ERANGE)
die("getcwd(): %s", strerror(errno));
}
}
static void setupsighandlers(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = stop;
if (sigaction(SIGINT, &sa, NULL) == -1 || sigaction(SIGTERM, &sa, NULL) == -1)
die("sigaction(): %s", strerror(errno));
/*
* SIG_IGN SIGCHLD prevents zombies creation since POSIX.1 2001.
*
* SIGPIPE is raised when a client prematurely closes the connection.
* Default behavior is to terminate the process, so we ignore it to
* handle the error.
*/
sa.sa_handler = SIG_IGN;
if (sigaction(SIGCHLD, &sa, NULL) == -1 || sigaction(SIGPIPE, &sa, NULL) == -1)
die("sigaction(): %s", strerror(errno));
}
static void stop(int sig)
{
(void)sig;
server.running = 0;
}
static void logsrvinfo(void)
{
SockaddrStorage ss;
socklen_t sslen = sizeof(ss);
char address[INET6_ADDRSTRLEN], port[INET6_PORTSTRLEN];
memset(&ss, 0, sslen);
if (getsockname(server.sock, (struct sockaddr *)&ss, &sslen) == -1)
die("getsockname(): %s", strerror(errno));
ssinetntop(&ss, address, port);
printf("serving %s at http://%s:%s pid is %ld\n",
server.rootpath,
address,
port,
(long)getpid());
}
static void ssinetntop(const SockaddrStorage *ss, char *address, char *port)
{
if (ss->ss_family == AF_INET) {
inet_ntop(AF_INET, &(((struct sockaddr_in *)ss)->sin_addr), address, INET_ADDRSTRLEN);
sprintf(port, "%u", ntohs(((struct sockaddr_in *)ss)->sin_port));
} else if (ss->ss_family == AF_INET6) {
inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)ss)->sin6_addr), address, INET6_ADDRSTRLEN);
sprintf(port, "%u", ntohs(((struct sockaddr_in6 *)ss)->sin6_port));
} else
address[0] = port[0] = '\0';
}
static void run(void)
{
int client;
server.running = 1;
while (server.running) {
client = accept(server.sock, NULL, NULL);
if (client == -1) {
if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK)
logerror("accept(): %s", strerror(errno));
continue;
}
switch (fork()) {
case 0:
handlereq(client);
return;
case -1:
logerror("fork(): %s", strerror(errno));
/* fallthrough */
default:
close(client);
}
}
}
static void handlereq(int client)
{
HConnection *conn = hopen(client);
if (conn == NULL) {
logerror("cannot open http connection");
return;
}
do {
hclear(conn);
recvreq(conn);
if ( ! isalive(conn))
break; /* client disconnected, don't bother go on */
conn->reqsleft--;
buildresp(conn);
sendresp(conn);
logconnection(conn);
} while (conn->req.keepalive && conn->reqsleft > 0);
hclose(conn);
}
static HConnection *hopen(int client)
{
HConnection *conn = NULL;
socklen_t addrlen = sizeof(SockaddrStorage);
int outfd = -1;
if (setsocktimeout(client, CONNTIMEOUT) == -1)
goto error;
conn = malloc(sizeof(*conn));
if (conn == NULL)
goto error;
conn->in = fdopen(client, "r");
if (conn->in == NULL)
goto error;
if (getpeername(client, (struct sockaddr *)&conn->addr, &addrlen) == -1)
goto error;
outfd = dup(client);
if (outfd == -1)
goto error;
conn->out = fdopen(outfd, "w");
if (conn->out == NULL)
goto error;
conn->reqsleft = CONNMAXREQS;
conn->req.uri = NULL;
conn->resp.file = NULL;
bufinit(&conn->resp.headers);
bufinit(&conn->resp.content);
bufinit(&conn->buf);
hclear(conn);
return conn;
error:
if (conn != NULL) {
if (conn->in != NULL)
fclose(conn->in);
free(conn);
}
if (outfd != -1)
close(outfd);
return NULL;
}
static int setsocktimeout(int sock, time_t sec)
{
struct timeval timeout;
timeout.tv_sec = sec;
timeout.tv_usec = 0;
if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) == 0
&& setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) == 0)
return 0;
return -1;
}
static void hclear(HConnection *conn)
{
conn->req.timestamp = (time_t)-1;
conn->req.method[0] = '\0';
conn->req.keepalive = 0;
conn->req.ifmodsince[0] = '\0';
conn->req.range.start = -1;
conn->req.range.end = -1;
conn->resp.status = 500;
conn->resp.bsent = 0;
conn->resp.filesize = -1;
free(conn->req.uri);
conn->req.uri = NULL;
if (conn->resp.file != NULL)
fclose(conn->resp.file);
conn->resp.file = NULL;
bufclear(&conn->resp.headers);
bufclear(&conn->resp.content);
bufclear(&conn->buf);
}
static void hclose(HConnection *conn)
{
hclear(conn); /* to free req.uri and close resp.file */
bufdeinit(&conn->resp.headers);
bufdeinit(&conn->resp.content);
bufdeinit(&conn->buf);
fclose(conn->in);
fclose(conn->out);
free(conn);
}
static int isalive(HConnection *conn)
{
return ! feof(conn->in) && ! ferror(conn->in) && ! ferror(conn->out);
}
static int recvreq(HConnection *conn)
{
int ret = parsemethod(conn);
conn->req.timestamp = time(NULL);
if (ret != 200)
goto done;
ret = parseuri(conn);
if (ret != 200)
goto done;
ret = parseversion(conn);
if (ret != 200)
goto done;
ret = parseheaders(conn);
done:
conn->resp.status = ret;
return ret;
}
static int parsemethod(HConnection *conn)
{
char buf[METHODMAX];
size_t len = 0;
int c;
while ((c = fgetc(conn->in)) != EOF) {
if (c == ' ' || ! isupper(c) || len == sizeof(buf) - 1)
break;
buf[len++] = c;
}
if (len == 0 || c != ' ')
return 400;
memcpy(conn->req.method, buf, len);
conn->req.method[len] = '\0';
if (strcmp("GET", conn->req.method) != 0 && strcmp("HEAD", conn->req.method) != 0)
return 501;
return 200;
}
static int parseuri(HConnection *conn)
{
Buffer *buf = &conn->buf;
int c;
bufclear(buf);
while ((c = fgetc(conn->in)) != EOF) {
if (c == ' ')
break;
if (buf->len == URIMAX - 1)
return 414;
if (bufputc(buf, c) == -1)
return 500;
}
if (buf->len == 0 || c != ' ')
return 400;
if (bufputc(buf, '\0') == -1)
return 500;
uridecode(buf->data);
conn->req.uri = strdup(buf->data);
if (conn->req.uri == NULL)
return 500;
return 200;
}
static int parseversion(HConnection *conn)
{
int c;
if (fgetc(conn->in) != 'H'
|| fgetc(conn->in) != 'T'
|| fgetc(conn->in) != 'T'
|| fgetc(conn->in) != 'P'
|| fgetc(conn->in) != '/')
return 400;
c = fgetc(conn->in);
if ( ! isdigit(c))
return 400;
if (c != '1')
return 505;
if (fgetc(conn->in) != '.')
return 400;
c = fgetc(conn->in);
if ( ! isdigit(c))
return 400;
if (c != '0' && c != '1')
return 505;
if (fgetc(conn->in) != '\r' || fgetc(conn->in) != '\n')
return 400;
return 200;
}
static int parseheaders(HConnection *conn)
{
Buffer *buf = &conn->buf;
int i, c;
char *name, *value;
for (i = 0; i < MAXHEADERS; i++) {
bufclear(buf);
while ((c = fgetc(conn->in)) != EOF) {
if (c == '\r')
break;
if (buf->len == HEADERMAX - 1)
return 431;
if (bufputc(buf, c) == -1)
return 500;
}
if (fgetc(conn->in) != '\n')
return 400;
if (buf->len == 0)
return 200; /* end of headers */
if (bufputc(buf, '\0') == -1)
return 500;
name = buf->data;
value = strchr(name, ':');
if (value == NULL)
return 400; /* malformed header */
*value++ = '\0'; /* null-terminate name string */
value = strtrim(value);
if (strcasecmp("connection", name) == 0)
parseconnection(conn, value);
else if (strcasecmp("if-modified-since", name) == 0)
parseifmodsince(conn, value);
else if (strcasecmp("range", name) == 0)
parserange(conn, value);
}
return i < MAXHEADERS ? 200 : 431;
}
static void parseconnection(HConnection *conn, const char *value)
{
conn->req.keepalive = strcmp(value, "keep-alive") == 0;
}
static void parseifmodsince(HConnection *conn, const char *value)
{
size_t len = MIN(strlen(value), sizeof(conn->req.ifmodsince) - 1);
memcpy(conn->req.ifmodsince, value, len);
conn->req.ifmodsince[len] = '\0';
}
static void parserange(HConnection *conn, const char *value)
{
const char *p = value;
char buf[32];
long start = -1, end = -1;
size_t i;
if (strncmp(p, "bytes=", strlen("bytes=")) != 0)
return;
p += strlen("bytes=");
for (i = 0; isdigit(*p) && i < sizeof(buf) - 1; i++, p++)
buf[i] = *p;
buf[i] = '\0';
if (*p != '-')
return;
if (buf[0] != '\0')
start = atol(buf);
for (i = 0, p++; isdigit(*p) && i < sizeof(buf) - 1; i++, p++)
buf[i] = *p;
buf[i] = '\0';
if (*p != '\0' && *p != '-')
return;
if (buf[0] != '\0')
end = atol(buf);
if ((start > -1 && end == -1)
|| (start == -1 && end > -1)
|| (start > -1 && end > -1 && start <= end)) {
conn->req.range.start = start;
conn->req.range.end = end;
}
}
static int buildresp(HConnection *conn)
{
struct stat finfo;
const char *relpath;
if (conn->resp.status != 200)
return buildresperror(conn, conn->resp.status);
relpath = strtrim(conn->req.uri);
if (relpath[0] == '.' || strstr(relpath, "/.") != NULL)
return buildresperror(conn, 404);
for (; *relpath == '/'; relpath++)
;
if (*relpath == '\0')
relpath = "./";
if (stat(relpath, &finfo) == -1)
return buildresperror(conn, 404);
if (S_ISREG(finfo.st_mode))
return buildrespfile(conn, relpath, &finfo);
else if (S_ISDIR(finfo.st_mode))
return buildrespdir(conn, relpath);
return buildresperror(conn, 403);
}
static int buildresperror(HConnection *conn, int errstatus)
{
hprintf(conn, "<!DOCTYPE html><meta charset=\"utf-8\"/><title>%d %s</title><h1>%d %s</h1>",
errstatus, strstatus(errstatus), errstatus, strstatus(errstatus));
addheader(conn, "Content-Type", "text/html");
conn->resp.status = errstatus;
return errstatus;
}
static int buildrespfile(HConnection *conn, const char *path, const struct stat *finfo)
{
char lastmod[DATEMAX];
FILE *f;
time2hdate(finfo->st_mtime, lastmod);
if (strcmp(lastmod, conn->req.ifmodsince) == 0) {
conn->resp.status = 304;
return 304;
}
f = fopen(path, "r");
if (f == NULL)
return buildresperror(conn, 403);
addheader(conn, "Accept-Ranges", "bytes");
addheader(conn, "Last-Modified", "%s", lastmod);
addheader(conn, "Content-Type", "%s", parsemimetype(path, f));
conn->resp.file = f;
conn->resp.filesize = finfo->st_size;
conn->resp.status = 200;
return 200;
}
static int buildrespdir(HConnection *conn, const char *path)
{
Buffer *buf = &conn->buf;
size_t pathlen = strlen(path);
struct stat finfo;
struct dirent **entries;
int n, ret;
assert(buf->data != path);
/*
* redirect if directory path doesn't end with /
*/
if (path[pathlen - 1] != '/') {
if (bufreserve(buf, pathlen * 3 + 1) == -1)
return buildresperror(conn, 500);
addheader(conn, "Location", "/%s/", uriencode(path, buf->data, buf->cap));
return buildresperror(conn, 301);
}
/*
* try index file
*/
bufclear(buf);
if (bufputs(buf, path) == -1
|| bufputs(buf, server.index) == -1
|| bufputc(buf, '\0') == -1)
return buildresperror(conn, 500);
if (stat(buf->data, &finfo) == 0 && S_ISREG(finfo.st_mode))
return buildrespfile(conn, buf->data, &finfo);
/*
* directory listing
*/
n = scandir(path, &entries, scandirfilter, scandircmp);
if (n == -1)
return buildresperror(conn, 404);
ret = buildrespdirlist(conn, path, entries, n);
while (n--)
free(entries[n]);
free(entries);
return ret;
}
static int scandirfilter(const struct dirent *entry)
{
return entry->d_name[0] != '.';
}
static int scandircmp(const struct dirent **a, const struct dirent **b)
{
return strcasecmp((*a)->d_name, (*b)->d_name);
}
static int buildrespdirlist(HConnection *conn, const char *path, struct dirent **entries, int n)
{
Buffer *buf = &conn->buf;
struct stat finfo;
char mtime[DATEMAX];
const char *title, *fname, *fmt;
int i;
assert(buf->data != path);
title = strcmp(path, "./") == 0 ? "" : path;
hprintf(conn, "<!DOCTYPE html><meta charset=\"utf-8\"/><style>"
" table { border-collapse: collapse; }"
" td { border: 1px solid #ddd; padding: 10px; }"
" tr:nth-child(odd) { background-color: #f2f2f2; }"
" td:nth-child(3) { text-align: right }"
" a { text-decoration: none }"
"</style><title>/%s</title><h1>/%s</h1><table>\n",
title, title);
for (i = 0; i < n; i++) {
fname = entries[i]->d_name;
bufclear(buf);
bufputs(buf, path);
bufputs(buf, fname);
bufputc(buf, '\0');
if (lstat(buf->data, &finfo) == -1)
continue;
if (S_ISREG(finfo.st_mode))
fmt = "<tr><td><a href=\"%s\">%s</a></td><td>%s</td><td>%ld</td></tr>\n";
else if (S_ISDIR(finfo.st_mode))
fmt = "<tr><td><a href=\"%s/\"><b>%s/</b></a></td><td>%s</td><td>%ld</td></tr>\n";
else if (S_ISLNK(finfo.st_mode))
fmt = "<tr><td><a href=\"%s\">%s@</a></td><td>%s</td><td>%ld</td></tr>\n";
else
continue;
if (bufreserve(buf, strlen(fname) * 3 + 1) == -1)
continue;
strftime(mtime, sizeof(mtime), "%Y-%m-%d %H:%M:%S %Z", localtime(&finfo.st_mtime));
hprintf(conn, fmt, uriencode(fname, buf->data, buf->cap), fname, mtime, (long)finfo.st_size);
}
hprintf(conn, "</table>\n");