eris/eris.c

1025 lines
22 KiB
C
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/*
* simple httpd to be started from tcpserver
*/
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#define _FILE_OFFSET_BITS 64
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
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#include <stdio.h>
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#include <string.h>
#include <signal.h>
#include <sys/wait.h>
#include <grp.h>
#include <errno.h>
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#include <sys/select.h>
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#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <dirent.h>
#include <limits.h>
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#include "strings.h"
#include "mime.h"
#include "timerfc.h"
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#include "version.h"
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#ifdef __linux__
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# include <sys/sendfile.h>
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#else
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# define sendfile(a, b, c, d) -1
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#endif
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#ifndef min
#define min(a,b) ((a)<(b)?(a):(b))
#endif
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/*
* Some things I use for debugging
*/
#define DUMPf(fmt, args...) fprintf(stderr, "%s:%s:%d " fmt "\n", __FILE__, __FUNCTION__, __LINE__, ##args)
#define DUMP() DUMPf("")
#define DUMP_d(v) DUMPf("%s = %d", #v, v)
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#define DUMP_u(v) DUMPf("%s = %u", #v, v)
#define DUMP_x(v) DUMPf("%s = 0x%x", #v, v)
#define DUMP_s(v) DUMPf("%s = %s", #v, v)
#define DUMP_c(v) DUMPf("%s = %c", #v, v)
#define DUMP_p(v) DUMPf("%s = %p", #v, v)
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#define DUMP_buf(v, l) DUMPf("%s = %.*s", #v, (int)(l), v)
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/* Wait this long (seconds) for a valid HTTP request */
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#define READTIMEOUT 2
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/* Wait this long (seconds) for a non-file send to complete */
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#define WRITETIMEOUT 10
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/* Quit if we can't write at least this many bytes per second */
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#define MIN_WRITE_RATE 2560
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/* Wait this long for CGI to complete */
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#define CGI_TIMEOUT (5*60)
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/* How long each sendfile call can take */
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#define SENDFILE_TIMEOUT ((int)(SIZE_MAX / MIN_WRITE_RATE))
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/* Maximum size of a request header (the whole block) */
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#define MAXHEADERLEN 8192
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/* Maximum size of a request line */
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#define MAXREQUESTLEN 2048
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/* Maximum number of header fields */
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#define MAXHEADERFIELDS 60
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#define BUFFER_SIZE 8192
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/*
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* Options
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*/
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int doauth = 0;
int docgi = 0;
int doidx = 0;
int nochdir = 0;
int redirect = 0;
int portappend = 0;
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char *connector = NULL;
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/* Variables that persist between requests */
int cwd;
int keepalive = 0;
char *remote_addr = NULL;
char *remote_ident = NULL;
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/*
* Things that are really super convenient to have globally.
* These could be put into a struct for a threading version
* of eris.
*/
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enum { GET, POST, HEAD, CONNECT } method;
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char *host;
char *user_agent;
char *refer;
char *path;
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int http_version;
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char *content_type;
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size_t content_length;
off_t range_start, range_end;
time_t ims;
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#define BUFFER_SIZE 8192
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/** Log a request */
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void
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dolog(int code, off_t len)
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{ /* write a log line to stderr */
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sanitize(host);
sanitize(user_agent);
sanitize(refer);
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fprintf(stderr, "%s %d %lu %s %s %s %s\n",
remote_addr, code, (unsigned long) len, host, user_agent, refer, path);
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}
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void
header(unsigned int code, const char *httpcomment)
{
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printf("HTTP/1.%d %u %s\r\n", http_version, code, httpcomment);
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printf("Server: %s\r\n", FNORD);
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printf("Connection: %s\r\n", keepalive?"keep-alive":"close");
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}
void
eoh()
{
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printf("\r\n");
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}
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/*
* output an error message and exit
*/
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void
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badrequest(long code, const char *httpcomment, const char *message)
{
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size_t msglen = 0;
keepalive = 0;
header(code, httpcomment);
if (message) {
msglen = (strlen(message) * 2) + 15;
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printf("Content-Length: %lu\r\nContent-Type: text/html\r\n\r\n",
(unsigned long) msglen);
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printf("<title>%s</title>%s", message, message);
}
printf("\r\n");
fflush(stdout);
dolog(code, msglen);
exit(0);
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}
void
env(const char *k, const char *v)
{
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if (v) {
setenv(k, v, 1);
}
}
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void
not_found()
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{
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char msg[] = "The requested URL does not exist here.";
header(404, "Not Found");
printf("Content-Type: text/html\r\n");
printf("Content-Length: %lu\r\n", (unsigned long) sizeof msg);
printf("\r\n");
printf("%s\n", msg); /* sizeof msg includes the NULL */
dolog(404, sizeof msg);
fflush(stdout);
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}
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char *
proto_getenv(char *proto, char *name)
{
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char buf[80];
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snprintf(buf, sizeof buf, "%s%s", proto, name);
return getenv(buf);
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}
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void
get_ucspi_env()
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{
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char *ucspi = getenv("PROTO");
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if (ucspi) {
char *p;
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/* Busybox, as usual, has the right idea */
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if ((p = proto_getenv(ucspi, "REMOTEADDR"))) {
remote_addr = strdup(p);
} else {
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char *ip = proto_getenv(ucspi, "REMOTEIP");
char *port = proto_getenv(ucspi, "REMOTEPORT");
if (ip) {
char buf[80];
snprintf(buf, sizeof buf, "%s:%s", ip, port);
remote_addr = strdup(buf);
}
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}
if ((p = proto_getenv(ucspi, "REMOTEINFO"))) {
remote_ident = strdup(p);
}
}
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if (! remote_addr) {
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// stunnel
remote_addr = getenv("REMOTE_ADDR");
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}
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}
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void
parse_options(int argc, char *argv[])
{
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int opt;
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while (-1 != (opt = getopt(argc, argv, "acdhkpro:v."))) {
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switch (opt) {
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case 'a':
doauth = 1;
break;
case 'c':
docgi = 1;
break;
case 'd':
doidx = 1;
break;
case '.':
nochdir = 1;
break;
case 'p':
portappend = 1;
break;
case 'r':
redirect = 1;
break;
case 'o':
connector = optarg;
break;
case 'v':
printf("%s\n", FNORD);
exit(0);
case 'h':
default:
fprintf(stderr, "Usage: %s [OPTIONS]\n",
argv[0]);
fprintf(stderr, "\n");
fprintf(stderr, "-a Enable authentication\n");
fprintf(stderr, "-c Enable CGI\n");
fprintf(stderr, "-d Enable directory listing\n");
fprintf(stderr, "-. Serve out of ./ (no vhosting)\n");
fprintf(stderr, "-p Append port to hostname directory\n");
fprintf(stderr, "-r Enable symlink redirection\n");
fprintf(stderr, "-o HANDLER Path to HTTP CONNECT handler\n");
fprintf(stderr, "-v Print version and exit\n");
exit(69);
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}
}
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}
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/*
* CGI stuff
*/
static void
sigchld(int sig)
{
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while (waitpid(0, NULL, WNOHANG) > 0);
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}
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static void
sigalarm_cgi(int sig)
{
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/* send this out regardless of whether we've already sent a header,
* to maybe help with debugging */
badrequest(504, "Gateway Timeout", "The CGI is being too slow.");
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}
static void
cgi_child(const char *relpath)
{
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env("GATEWAY_INTERFACE", "CGI/1.1");
env("SERVER_SOFTWARE", FNORD);
env("REQUEST_URI", path);
env("SERVER_NAME", host);
env("SCRIPT_NAME", relpath);
env("REMOTE_ADDR", remote_addr);
env("REMOTE_IDENT", remote_ident);
if (content_length) {
char cl[20];
snprintf(cl, sizeof cl, "%llu", (unsigned long long) content_length);
env("CONTENT_LENGTH", cl);
env("CONTENT_TYPE", content_type);
}
/* Try to change to CGI's directory */
{
char *delim = strrchr(relpath, '/');
if (delim) {
*delim = '\0';
if (0 == chdir(relpath)) {
relpath = delim + 1;
}
}
}
execl(relpath, relpath, NULL);
exit(1);
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}
void
cgi_parent(int cin, int cout, int passthru)
{
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char cgiheader[BUFFER_SIZE];
size_t cgiheaderlen = 0;
FILE *cinf = fdopen(cin, "rb");
size_t size = 0;
int header_sent = 0;
int code = 200;
fcntl(cin, F_SETFL, O_NONBLOCK);
signal(SIGCHLD, sigchld);
signal(SIGPIPE, SIG_IGN); /* NO! no signal! */
signal(SIGALRM, sigalarm_cgi);
while (1) {
int nfds;
fd_set rfds, wfds;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
FD_SET(cin, &rfds);
nfds = cin;
if (content_length) {
/* have post data */
FD_SET(cout, &wfds);
if (cout > nfds) {
nfds = cout;
}
} else if (cout >= 0) {
close(cout); /* no post data */
cout = -1;
}
alarm(CGI_TIMEOUT);
if (-1 == select(nfds+1, &rfds, &wfds, NULL, NULL)) {
break;
}
if (FD_ISSET(cin, &rfds)) {
if (passthru) {
/* Pass everything through verbatim */
size_t len;
/* Re-use this big buffer */
len = fread(cgiheader, 1, sizeof cgiheader, cinf);
if (0 == len) {
/* CGI is done */
break;
}
fwrite(cgiheader, 1, len, stdout);
/* Naively assume the CGI knows best about sending stuff */
fflush(stdout);
size += len;
} else {
/* Interpret header fields */
size_t readlen = (sizeof cgiheader) - cgiheaderlen;
if (NULL == fgets(cgiheader + cgiheaderlen, readlen, cinf)) {
/* EOF or error */
badrequest(500, "CGI Error", "CGI output too weird");
}
cgiheaderlen = strlen(cgiheader);
if ('\n' == cgiheader[cgiheaderlen - 1]) {
/* We read a whole line */
size_t len;
char *val;
len = extract_header_field(cgiheader, &val, 0);
if (! len) {
/* We've read the entire header block */
passthru = 1;
eoh();
} else {
if (! header_sent) {
if (! strcasecmp(cgiheader, "Location")) {
header(302, "CGI Redirect");
printf("%s: %s\r\n\r\n", cgiheader, val);
dolog(302, 0);
exit(0);
} else if (! strcasecmp(cgiheader, "Status")) {
char *txt;
if (val) {
code = (int)strtol(val, &txt, 10);
} else {
code = 0;
}
if (code < 100) {
header(500, "Internal Error");
printf("CGI returned Status: %d\n", code);
dolog(500, 0);
exit(0);
}
for (; *txt == ' '; txt += 1);
header(code, txt);
} else {
header(200, "OK");
printf("Pragma: no-cache\r\n");
}
header_sent = 1;
}
printf("%s: %s\r\n", cgiheader, val);
cgiheaderlen = 0;
}
}
}
} else if (FD_ISSET(cout, &wfds)) {
/*
* write to cgi the post data
*/
if (content_length) {
size_t len;
char buf[BUFFER_SIZE];
size_t nmemb = min(BUFFER_SIZE, content_length);
char *p = buf;
len = fread(buf, 1, nmemb, stdin);
if (len < 1) {
break;
}
content_length -= len;
while (len > 0) {
size_t wlen = write(cout, p, len);
if (wlen == -1) {
break;
}
len -= wlen;
p += wlen;
}
} else {
close(cout);
}
}
}
fflush(stdout);
dolog(code, size);
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}
void
serve_cgi(char *relpath)
{
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int pid;
int cin[2];
int cout[2];
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if (pipe(cin) || pipe(cout)) {
badrequest(500, "Internal Server Error", "Server Resource problem.");
}
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pid = fork();
if (-1 == pid) {
badrequest(500, "Internal Server Error", "Unable to fork.");
}
if (pid) {
close(cin[1]);
close(cout[0]);
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/* Eris is not this smart yet */
keepalive = 0;
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cgi_parent(cin[0], cout[1], 0);
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exit(0);
} else {
close(cwd);
close(cout[1]);
close(cin[0]);
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dup2(cout[0], 0);
dup2(cin[1], 1);
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close(cout[0]);
close(cin[1]);
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cgi_child(relpath);
}
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}
/*
* Main HTTPd
*/
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ssize_t
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fake_sendfile(int out_fd, int in_fd, off_t *offset, size_t count)
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{
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char buf[BUFFER_SIZE];
ssize_t l, m;
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/* is mmap quicker? does it matter? */
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if (-1 == lseek(in_fd, *offset, SEEK_SET)) {
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/* We're screwed. The most helpful thing we can do now is die. */
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fprintf(stderr, "Unable to seek. Dying.\n");
exit(0);
}
l = read(in_fd, buf, min(count, sizeof buf));
if (-1 == l) {
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/* Also screwed. */
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fprintf(stderr, "Unable to read an open file. Dying.\n");
exit(0);
}
*offset += l;
while (l) {
m = write(out_fd, buf, l);
if (-1 == m) {
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/* ALSO screwed. */
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fprintf(stderr, "Unable to write to client: %m (req %s). Dying.\n", path);
exit(0);
}
l -= m;
}
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return l;
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}
void
serve_file(int fd, char *filename, struct stat *st)
{
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off_t len, remain;
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if (method == POST) {
badrequest(405, "Method Not Supported", "POST is not supported by this URL");
}
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if (st->st_mtime <= ims) {
header(304, "Not Changed");
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dolog(304, 0);
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eoh();
return;
}
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header(200, "OK");
printf("Content-Type: %s\r\n", getmimetype(filename));
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if ((range_end == 0) || (range_end > st->st_size)) {
range_end = st->st_size;
}
len = range_end - range_start;
printf("Content-Length: %llu\r\n", (unsigned long long) len);
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{
struct tm *tp;
char buf[40];
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tp = gmtime(&(st->st_mtime));
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strftime(buf, sizeof buf, "%a, %d %b %Y %H:%M:%S GMT", tp);
printf("Last-Modified: %s\r\n", buf);
}
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eoh();
fflush(stdout);
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if (method == HEAD) {
return;
}
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for (remain = len; remain; ) {
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size_t count = min(remain, SIZE_MAX);
ssize_t sent;
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alarm(SENDFILE_TIMEOUT);
sent = sendfile(1, fd, &range_start, count);
if (-1 == sent) {
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sent = fake_sendfile(1, fd, &range_start, count);
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}
remain -= sent;
}
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dolog(200, len);
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}
void
serve_idx(int fd, char *path)
{
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DIR *d = fdopendir(fd);
struct dirent *de;
if (method == POST) {
badrequest(405, "Method Not Supported", "POST is not supported by this URL");
}
keepalive = 0;
header(200, "OK");
printf("Content-Type: text/html\r\n");
eoh();
printf("<!DOCTYPE html>\r<html><head><title>");
html_esc(stdout, path);
printf("</title></head><body><h1>Directory Listing: ");
html_esc(stdout, path);
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printf("</h1><pre>\n");
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if (path[1]) {
printf("<a href=\"../\">Parent Directory</a>\n");
}
while ((de = readdir(d))) {
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char *name = de->d_name;
char symlink[PATH_MAX];
struct stat st;
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if (name[0] == '.') {
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continue; /* hidden files -> skip */
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}
if (lstat(name, &st)) {
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continue; /* can't stat -> skip */
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}
if (S_ISDIR(st.st_mode)) {
printf("[DIR] ");
} else if (S_ISLNK(st.st_mode)) {
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ssize_t len = readlink(de->d_name, symlink, (sizeof symlink) - 1);
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if (len < 1) {
continue;
}
name = symlink;
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printf("[LNK] "); /* symlink */
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} else if (S_ISREG(st.st_mode)) {
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printf("%10llu", (unsigned long long)st.st_size);
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} else {
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continue; /* not a file we can provide -> skip */
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}
/*
* write a href
*/
printf(" <a href=\"");
url_esc(stdout, name);
if (S_ISDIR(st.st_mode)) {
printf("/");
}
printf("\">");
url_esc(stdout, name);
printf("</a>\n");
}
printf("</pre></body></html>");
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dolog(200, 0);
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}
void
find_serve_file(char *relpath)
{
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int fd;
struct stat st;
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/* Open fspath. If that worked, */
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if ((fd = open(relpath, O_RDONLY)) > -1) {
fstat(fd, &st);
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/* If it is a directory, */
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if (S_ISDIR(st.st_mode)) {
char path2[PATH_MAX];
int fd2;
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/* Redirect if it doesn't end with / */
if (! endswith(path, "/")) {
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header(301, "Redirect");
printf("Location: %s/\r\n", path);
eoh();
return;
}
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/* Open relpath + "index.html". If that worked,*/
snprintf(path2, sizeof path2, "%sindex.html", relpath);
if ((fd2 = open(path2, O_RDONLY)) > -1) {
/* serve that file and return. */
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fstat(fd2, &st);
serve_file(fd2, path2, &st);
close(fd2);
close(fd);
return;
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} else {
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if (docgi) {
snprintf(path2, sizeof path2, "%sindex.cgi", relpath);
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if (! stat(path2, &st)) {
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return serve_cgi(path2);
}
}
if (doidx) {
serve_idx(fd, relpath + 1);
close(fd);
return;
}
return not_found();
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}
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} else {
if (docgi && endswith(relpath, ".cgi")) {
close(fd);
return serve_cgi(relpath);
}
serve_file(fd, relpath, &st);
}
} else {
if (docgi && (errno == ENOTDIR)) {
char *p;
if ((p = strstr(relpath, ".cgi"))) {
p += 4;
env("PATH_INFO", p);
*p = 0;
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if (! stat(relpath, &st)) {
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close(fd);
return serve_cgi(relpath);
}
}
}
return not_found();
}
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}
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void
handle_request()
{
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char request[MAXREQUESTLEN];
char fspath[PATH_MAX];
char buf[MAXHEADERLEN];
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char *p;
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/* Initialize globals */
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host = NULL;
user_agent = NULL;
refer = NULL;
path = NULL;
range_start = 0;
range_end = 0;
content_type = NULL;
content_length = 0;
ims = 0;
alarm(READTIMEOUT);
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/* Read request line first */
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request[0] = 0;
if (NULL == fgets(request, sizeof request, stdin)) {
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/* They must have hung up! */
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exit(0);
}
if (!strncmp(request, "GET /", 5)) {
method = GET;
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p = request + 4;
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} else if (!strncmp(request, "POST /", 6)) {
method = POST;
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p = request + 5;
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} else if (!strncmp(request, "HEAD /", 6)) {
method = HEAD;
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p = request + 5;
} else if (connector && !strncmp(request, "CONNECT ", 8)) {
method = CONNECT;
p = request + 8;
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} else {
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/* This also handles the case where fgets does nothing */
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badrequest(405, "Method Not Allowed", "Unsupported HTTP method.");
}
if (docgi) {
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p[-1] = 0;
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env("REQUEST_METHOD", request);
}
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/* Interpret path into fspath. */
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path = p;
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{
char *fsp = fspath;
char *query_string = NULL;
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*(fsp++) = '.';
for (; *p != ' '; p += 1) {