/*
* Send a text file to the client
*/
void send_text_file(state *st)
{
FILE *fp;
char in[BUFSIZE];
char out[BUFSIZE];
int line;
if (st->debug) syslog(LOG_INFO, "outputting text file \"%s\"", st->req_realpath);
if ((fp = fopen(st->req_realpath , "r")) == NULL) return;
/* Loop through the file line by line */
line = 0;
while (fgets(in, sizeof(in), fp)) {
/* Covert to output charset & print */
if (st->opt_iconv) sstrniconv(st->out_charset, out, in);
else sstrlcpy(out, in);
chomp(out);
#ifdef ENABLE_STRICT_RFC1436
if (strcmp(out, ".") == MATCH) printf(".." CRLF);
else
#endif
printf("%s" CRLF, out);
line++;
}
#ifdef ENABLE_STRICT_RFC1436
printf("." CRLF);
#endif
fclose(fp);
}
/*
* Add one suffix->filetype mapping to the filetypes array
*/
void add_ftype_mapping(state *st, char *suffix)
{
char *type;
int i;
/* Let's not do anything stupid */
if (!*suffix) return;
if (!(type = strchr(suffix, '='))) return;
/* Extract type from the suffix=X string */
*type++ = '\0';
if (!*type) return;
/* Loop through the filetype array */
for (i = 0; i < st->filetype_count; i++) {
/* Old entry found? */
if (strcasecmp(st->filetype[i].suffix, suffix) == MATCH) {
st->filetype[i].type = *type;
return;
}
}
/* No old entry found - add new entry */
if (i < MAX_FILETYPES) {
sstrlcpy(st->filetype[i].suffix, suffix);
st->filetype[i].type = *type;
st->filetype_count++;
}
}
/*
* Add one selector rewrite mapping to the array
*/
void add_rewrite_mapping(state *st, char *match)
{
char *replace;
/* Check input and split it into match & replace */
if (!*match) return;
if (!(replace = strchr(match, '='))) return;
*replace++ = '\0';
if (!*replace) return;
/* Insert match/replace values into the array */
if (st->rewrite_count < MAX_REWRITE) {
sstrlcpy(st->rewrite[st->rewrite_count].match, match);
sstrlcpy(st->rewrite[st->rewrite_count].replace, replace);
st->rewrite_count++;
}
}
/*
* Print gopher menu line
*/
void info(state *st, char *str, char type)
{
char buf[BUFSIZE];
char selector[16];
/* Convert string to output charset */
if (st->opt_iconv) sstrniconv(st->out_charset, buf, str);
else sstrlcpy(buf, str);
/* Handle gopher title resources */
strclear(selector);
if (type == TYPE_TITLE) {
sstrlcpy(selector, "TITLE");
type = TYPE_INFO;
}
/* Output info line */
strcut(buf, st->out_width);
printf("%c%s\t%s\t%s" CRLF,
type, buf, selector, DUMMY_HOST);
}
void get_shm_session(state *st, shm_state *shm)
{
int i;
/* Get session id */
if ((i = get_shm_session_id(st, shm)) == ERROR) return;
/* Get session data */
if (st->opt_vhost) {
sstrlcpy(st->server_host, shm->session[i].server_host);
st->server_port = shm->session[i].server_port;
}
}
/*
* Print hURL redirect page
*/
void url_redirect(state *st)
{
char dest[BUFSIZE];
char *c;
/* Basic security checking */
sstrlcpy(dest, st->req_selector + 4);
if (sstrncmp(dest, "http://") != MATCH &&
sstrncmp(dest, "ftp://") != MATCH &&
sstrncmp(dest, "mailto:") != MATCH)
die(st, ERR_ACCESS, "Refusing to HTTP redirect unsafe protocols");
if ((c = strchr(dest, '"'))) *c = '\0';
if ((c = strchr(dest, '?'))) *c = '\0';
/* Log the redirect */
if (st->opt_syslog) {
syslog(LOG_INFO, "request for \"gopher://%s:%i/h%s\" from %s",
st->server_host,
st->server_port,
st->req_selector,
st->req_remote_addr);
}
log_combined(st, HTTP_OK);
/* Output HTML */
printf("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">\n"
"<HTML>\n<HEAD>\n"
" <META HTTP-EQUIV=\"Refresh\" content=\"1;URL=%1$s\">\n"
" <META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html;charset=iso-8859-1\">\n"
" <TITLE>URL Redirect page</TITLE>\n"
"</HEAD>\n<BODY>\n"
"<STRONG>Redirecting to <A HREF=\"%1$s\">%1$s</A></STRONG>\n"
"<PRE>\n", dest);
footer(st);
printf("</PRE>\n</BODY>\n</HTML>\n");
}
/*
* Scan, stat and sort a directory folders first (scandir replacement)
*/
int sortdir(char *path, sdirent *list, int max)
{
DIR *dp;
struct dirent *d;
struct stat s;
char buf[BUFSIZE];
int i;
/* Try to open the dir */
if ((dp = opendir(path)) == NULL) return 0;
i = 0;
/* Loop through the directory & stat() everything */
while (max--) {
if ((d = readdir(dp)) == NULL) break;
snprintf(buf, sizeof(buf), "%s/%s", path, d->d_name);
if (stat(buf, &s) == ERROR) continue;
if (strlen(d->d_name) > sizeof(list[i].name)) continue;
sstrlcpy(list[i].name, d->d_name);
list[i].mode = s.st_mode;
list[i].uid = s.st_uid;
list[i].gid = s.st_gid;
list[i].size = s.st_size;
list[i].mtime = s.st_mtime;
i++;
}
closedir(dp);
/* Sort the entries */
if (i > 1) qsort(list, i, sizeof(sdirent), foldersort);
/* Return number of entries found */
return i;
}
/*
* Parse command-line arguments
*/
void parse_args(state *st, int argc, char *argv[])
{
FILE *fp;
static const char readme[] = README;
static const char license[] = LICENSE;
struct stat file;
char buf[BUFSIZE];
int opt;
/* Parse args */
while ((opt = getopt(argc, argv, "h:p:r:t:g:a:c:u:m:l:w:o:s:i:k:f:e:R:D:L:A:P:n:db?-")) != ERROR) {
switch(opt) {
case 'h': sstrlcpy(st->server_host, optarg); break;
case 'p': st->server_port = atoi(optarg); break;
case 'r': sstrlcpy(st->server_root, optarg); break;
case 't': st->default_filetype = *optarg; break;
case 'g': sstrlcpy(st->map_file, optarg); break;
case 'a': sstrlcpy(st->map_file, optarg); break;
case 'c': sstrlcpy(st->cgi_file, optarg); break;
case 'u': sstrlcpy(st->user_dir, optarg); break;
case 'm': /* obsolete, replaced by -l */
case 'l': sstrlcpy(st->log_file, optarg); break;
case 'w': st->out_width = atoi(optarg); break;
case 'o':
if (sstrncasecmp(optarg, "UTF-8") == MATCH) st->out_charset = UTF_8;
if (sstrncasecmp(optarg, "ISO-8859-1") == MATCH) st->out_charset = ISO_8859_1;
break;
case 's': st->session_timeout = atoi(optarg); break;
case 'i': st->session_max_kbytes = abs(atoi(optarg)); break;
case 'k': st->session_max_hits = abs(atoi(optarg)); break;
case 'f': sstrlcpy(st->filter_dir, optarg); break;
case 'e': add_ftype_mapping(st, optarg); break;
case 'R': add_rewrite_mapping(st, optarg); break;
case 'D': sstrlcpy(st->server_description, optarg); break;
case 'L': sstrlcpy(st->server_location, optarg); break;
case 'A': sstrlcpy(st->server_admin, optarg); break;
case 'n':
if (*optarg == 'v') { st->opt_vhost = FALSE; break; }
if (*optarg == 'l') { st->opt_parent = FALSE; break; }
if (*optarg == 'h') { st->opt_header = FALSE; break; }
if (*optarg == 'f') { st->opt_footer = FALSE; break; }
if (*optarg == 'd') { st->opt_date = FALSE; break; }
if (*optarg == 'c') { st->opt_magic = FALSE; break; }
if (*optarg == 'o') { st->opt_iconv = FALSE; break; }
if (*optarg == 'q') { st->opt_query = FALSE; break; }
if (*optarg == 's') { st->opt_syslog = FALSE; break; }
if (*optarg == 'a') { st->opt_caps = FALSE; break; }
if (*optarg == 'm') { st->opt_shm = FALSE; break; }
if (*optarg == 'r') { st->opt_root = FALSE; break; }
break;
case 'd': st->debug = TRUE; break;
case 'b': puts(license); exit(EXIT_SUCCESS);
default : puts(readme); exit(EXIT_SUCCESS);
}
}
/* Sanitize options */
if (st->out_width > MAX_WIDTH) st->out_width = MAX_WIDTH;
if (st->out_width < MIN_WIDTH) st->out_width = MIN_WIDTH;
if (st->out_width < MIN_WIDTH + DATE_WIDTH) st->opt_date = FALSE;
if (!st->opt_syslog) st->debug = FALSE;
/* Primary vhost directory must exist or we disable vhosting */
if (st->opt_vhost) {
snprintf(buf, sizeof(buf), "%s/%s", st->server_root, st->server_host);
if (stat(buf, &file) == ERROR) st->opt_vhost = FALSE;
}
/* If -D arg looks like a file load the file contents */
if (*st->server_description == '/') {
if ((fp = fopen(st->server_description , "r"))) {
fgets(st->server_description, sizeof(st->server_description), fp);
chomp(st->server_description);
fclose(fp);
}
else strclear(st->server_description);
}
/* If -L arg looks like a file load the file contents */
if (*st->server_location == '/') {
if ((fp = fopen(st->server_location , "r"))) {
fgets(st->server_location, sizeof(st->server_location), fp);
chomp(st->server_location);
fclose(fp);
}
else strclear(st->server_location);
}
}
/*
* Get OS name, version & architecture we're running on
*/
void platform(state *st)
{
#ifdef HAVE_UNAME
#if defined(_AIX) || defined(__linux) || defined(__APPLE__)
FILE *fp;
#endif
#if defined(__arm__) || defined(__mips__) || defined(__APPLE__)
char buf[BUFSIZE];
#endif
#ifdef __linux
struct stat file;
#endif
struct utsname name;
char sysname[64];
char release[64];
char machine[64];
char *c;
/* Fetch system information */
uname(&name);
strclear(sysname);
strclear(release);
strclear(machine);
/* AIX-specific */
#ifdef _AIX
/* Fix uname() results */
sstrlcpy(machine, "powerpc");
snprintf(release, sizeof(release), "%s.%s",
name.version,
name.release);
/* Get CPU type */
if ((fp = popen("/usr/sbin/getsystype -i", "r"))) {
fgets(machine, sizeof(machine), fp);
pclose(fp);
strreplace(machine, ' ', '_');
}
/* Get hardware name using shell uname */
if (!*st->server_description &&
(fp = popen("/usr/bin/uname -M", "r"))) {
fgets(st->server_description,
sizeof(st->server_description), fp);
pclose(fp);
strreplace(st->server_description, ',', ' ');
chomp(st->server_description);
}
#endif
/* Mac OS X, just like Unix but totally different... */
#ifdef __APPLE__
/* Hardcode OS name */
sstrlcpy(sysname, "MacOSX");
/* Get OS X version */
if ((fp = popen("/usr/bin/sw_vers -productVersion", "r"))) {
fgets(release, sizeof(release), fp);
pclose(fp);
}
/* Get hardware name */
if (!*st->server_description &&
(fp = popen("/usr/sbin/sysctl -n hw.model", "r"))) {
/* Read hardware name */
fgets(buf, sizeof(buf), fp);
pclose(fp);
/* Clones are gone now so we'll hardcode the manufacturer */
sstrlcpy(st->server_description, "Apple ");
sstrlcat(st->server_description, buf);
/* Remove hardware revision */
for (c = st->server_description; *c; c++)
if (*c >= '0' && *c <= '9') { *c = '\0'; break; }
}
#endif
/* Linux uname() just says Linux/2.6 - let's dig deeper... */
#ifdef __linux
/* Most Linux ARM/MIPS boards have hardware name in /proc/cpuinfo */
#if defined(__arm__) || defined(__mips__)
if (!*st->server_description && (fp = fopen("/proc/cpuinfo" , "r"))) {
while (fgets(buf, sizeof(buf), fp)) {
#ifdef __arm__
if ((c = strkey(buf, "Hardware"))) {
#else
if ((c = strkey(buf, "machine"))) {
#endif
sstrlcpy(st->server_description, c);
chomp(st->server_description);
break;
}
}
fclose(fp);
}
#endif
/* Identify RedHat */
if (!*sysname && (fp = fopen("/etc/redhat-release", "r"))) {
fgets(sysname, sizeof(sysname), fp);
fclose(fp);
if ((c = strstr(sysname, "release "))) sstrlcpy(release, c + 8);
if ((c = strchr(release, ' '))) *c = '\0';
if ((c = strchr(sysname, ' '))) *c = '\0';
if (strcmp(sysname, "Red") == MATCH) sstrlcpy(sysname, "RedHat");
}
/* Identify Slackware */
if (!*sysname && (fp = fopen("/etc/slackware-version", "r"))) {
fgets(sysname, sizeof(sysname), fp);
fclose(fp);
if ((c = strchr(sysname, ' '))) {
sstrlcpy(release, c + 1);
*c = '\0';
}
}
/* Uh-oh.... how about a standard Linux with lsb_release? */
if (stat("/usr/bin/lsb_release", &file) == OK && (file.st_mode & S_IXOTH)) {
if (!*sysname && (fp = popen("/usr/bin/lsb_release -i -s", "r"))) {
fgets(sysname, sizeof(sysname), fp);
pclose(fp);
}
if (!*release && (fp = popen("/usr/bin/lsb_release -r -s", "r"))) {
fgets(release, sizeof(release), fp);
pclose(fp);
}
}
/* OK, nothing worked - let's try /etc/issue for sysname */
if (!*sysname && (fp = fopen("/etc/issue", "r"))) {
fgets(sysname, sizeof(sysname), fp);
fclose(fp);
if ((c = strchr(sysname, ' '))) *c = '\0';
if ((c = strchr(sysname, '\\'))) *c = '\0';
}
/* Debian version should be in /etc/debian_version */
if (!*release && (fp = fopen("/etc/debian_version", "r"))) {
fgets (release, sizeof(release), fp);
fclose(fp);
if ((c = strchr(release, '/'))) *c = '\0';
}
#endif
/* Haiku OS */
#ifdef __HAIKU__
/* Fix release name */
snprintf(release, sizeof(release), "R%s", name.release);
#endif
/* Fill in the blanks using uname() data */
if (!*sysname) sstrlcpy(sysname, name.sysname);
if (!*release) sstrlcpy(release, name.release);
if (!*machine) sstrlcpy(machine, name.machine);
/* I always liked weird Perl-only functions */
chomp(sysname);
chomp(release);
chomp(machine);
/* We're only interested in major.minor version */
if ((c = strchr(release, '.'))) if ((c = strchr(c + 1, '.'))) *c = '\0';
if ((c = strchr(release, '-'))) *c = '\0';
if ((c = strchr(release, '/'))) *c = '\0';
/* Create a nicely formatted platform string */
snprintf(st->server_platform, sizeof(st->server_platform), "%s/%s %s",
sysname,
#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__NetBSD__)
machine,
release);
#else
release,
machine);
#endif
/* Debug */
if (st->debug) {
syslog(LOG_INFO, "generated platform string \"%s\"",
st->server_platform);
}
#else
/* Fallback reply */
sstrlcpy(st->server_platform, "Unknown computer-like system");
#endif
}
/*
* Return current CPU load
*/
float loadavg(void)
{
FILE *fp;
char buf[BUFSIZE];
/* Faster Linux version */
#ifdef __linux
buf[0] = '\0';
if ((fp = fopen("/proc/loadavg" , "r")) == NULL) return 0;
fgets(buf, sizeof(buf), fp);
fclose(fp);
return (float) atof(buf);
/* Generic slow version - parse the output of uptime */
#else
#ifdef HAVE_POPEN
char *c;
if ((fp = popen("/usr/bin/uptime", "r"))) {
fgets(buf, sizeof(buf), fp);
pclose(fp);
if ((c = strstr(buf, "average: ")) || (c = strstr(buf, "averages: ")))
return (float) atof(c + 10);
}
#endif
/* Fallback reply */
return 0;
#endif
}
/*
* Main
*/
int main(int argc, char *argv[])
{
struct stat file;
state st;
char self[64];
char selector[BUFSIZE];
char buf[BUFSIZE];
char *dest;
char *c;
#ifdef HAVE_SHMEM
struct shmid_ds shm_ds;
shm_state *shm;
int shmid;
#endif
/* Get the name of this binary */
if ((c = strrchr(argv[0], '/'))) sstrlcpy(self, c + 1);
else sstrlcpy(self, argv[0]);
/* Initialize state */
#ifdef HAVE_LOCALES
setlocale(LC_TIME, DATE_LOCALE);
#endif
init_state(&st);
srand(time(NULL) / (getpid() + getppid()));
/* Handle command line arguments */
parse_args(&st, argc, argv);
/* Open syslog() */
if (st.opt_syslog) openlog(self, LOG_PID, LOG_DAEMON);
/* Make sure the computer is turned on */
#ifdef __HAIKU__
if (is_computer_on() != TRUE)
die(&st, ERR_ACCESS, "Please turn on the computer first");
#endif
/* Refuse to run as root */
#ifdef HAVE_PASSWD
if (st.opt_root && getuid() == 0)
die(&st, ERR_ACCESS, "Refusing to run as root");
#endif
/* Try to get shared memory */
#ifdef HAVE_SHMEM
if ((shmid = shmget(SHM_KEY, sizeof(shm_state), IPC_CREAT | SHM_MODE)) == ERROR) {
/* Getting memory failed -> delete the old allocation */
shmctl(shmid, IPC_RMID, &shm_ds);
shm = NULL;
}
else {
/* Map shared memory */
if ((shm = (shm_state *) shmat(shmid, (void *) 0, 0)) == (void *) ERROR)
shm = NULL;
/* Initialize mapped shared memory */
if (shm && shm->start_time == 0) {
shm->start_time = time(NULL);
/* Keep server platform & description in shm */
platform(&st);
sstrlcpy(shm->server_platform, st.server_platform);
sstrlcpy(shm->server_description, st.server_description);
}
}
/* For debugging shared memory issues */
if (!st.opt_shm) shm = NULL;
/* Get server platform and description */
if (shm) {
sstrlcpy(st.server_platform, shm->server_platform);
if (!*st.server_description)
sstrlcpy(st.server_description, shm->server_description);
}
else
#endif
platform(&st);
/* Read selector */
if (fgets(selector, sizeof(selector) - 1, stdin) == NULL)
selector[0] = '\0';
/* Remove trailing CRLF */
chomp(selector);
if (st.debug) syslog(LOG_INFO, "client sent us \"%s\"", selector);
/* Handle hURL: redirect page */
if (sstrncmp(selector, "URL:") == MATCH) {
st.req_filetype = TYPE_HTML;
sstrlcpy(st.req_selector, selector);
url_redirect(&st);
return OK;
}
/* Handle gopher+ root requests (UMN gopher client is seriously borken) */
if (sstrncmp(selector, "\t$") == MATCH) {
printf("+-1" CRLF);
printf("+INFO: 1Main menu\t\t%s\t%i" CRLF,
st.server_host,
st.server_port);
printf("+VIEWS:" CRLF " application/gopher+-menu: <512b>" CRLF);
printf("." CRLF);
if (st.debug) syslog(LOG_INFO, "got a request for gopher+ root menu");
return OK;
}
/* Convert HTTP request to gopher (respond using headerless HTTP/0.9) */
if (sstrncmp(selector, "GET ") == MATCH ||
sstrncmp(selector, "POST ") == MATCH ) {
if ((c = strchr(selector, ' '))) sstrlcpy(selector, c + 1);
if ((c = strchr(selector, ' '))) *c = '\0';
st.req_protocol = PROTO_HTTP;
if (st.debug) syslog(LOG_INFO, "got HTTP request for \"%s\"", selector);
}
/* Save default server_host & fetch session data (including new server_host) */
sstrlcpy(st.server_host_default, st.server_host);
#ifdef HAVE_SHMEM
if (shm) get_shm_session(&st, shm);
#endif
/* Loop through the selector, fix it & separate query_string */
dest = st.req_selector;
if (selector[0] != '/') *dest++ = '/';
for (c = selector; *c;) {
/* Skip duplicate slashes and /./ */
while (*c == '/' && *(c + 1) == '/') c++;
if (*c == '/' && *(c + 1) == '.' && *(c + 2) == '/') c += 2;
/* Start of a query string (either type 7 or HTTP-style)? */
if (*c == '\t' || (st.opt_query && *c == '?')) {
sstrlcpy(st.req_query_string, c + 1);
if ((c = strchr(st.req_query_string, '\t'))) *c = '\0';
break;
}
/* Start of virtual host hint? */
if (*c == ';') {
if (st.opt_vhost) sstrlcpy(st.server_host, c + 1);
/* Skip vhost on selector */
while (*c && *c != '\t') c++;
continue;
}
/* Copy valid char */
*dest++ = *c++;
}
*dest = '\0';
/* Remove encodings from selector */
strndecode(st.req_selector, st.req_selector, sizeof(st.req_selector));
/* Deny requests for Slashdot and /../ hackers */
if (strstr(st.req_selector, "/."))
die(&st, ERR_ACCESS, "Refusing to serve out dotfiles");
/* Handle /server-status requests */
#ifdef HAVE_SHMEM
if (sstrncmp(st.req_selector, SERVER_STATUS) == MATCH) {
if (shm) server_status(&st, shm, shmid);
return OK;
}
#endif
/* Remove possible extra cruft from server_host */
if ((c = strchr(st.server_host, '\t'))) *c = '\0';
/* Guess request filetype so we can die() with style... */
st.req_filetype = gopher_filetype(&st, st.req_selector, FALSE);
/* Convert seletor to path & stat() */
selector_to_path(&st);
if (st.debug) syslog(LOG_INFO, "path to resource is \"%s\"", st.req_realpath);
if (stat(st.req_realpath, &file) == ERROR) {
/* Handle virtual /caps.txt requests */
if (st.opt_caps && sstrncmp(st.req_selector, CAPS_TXT) == MATCH) {
#ifdef HAVE_SHMEM
caps_txt(&st, shm);
#else
caps_txt(&st, NULL);
#endif
return OK;
}
/* Requested file not found - die() */
die(&st, ERR_NOTFOUND, NULL);
}
/* Fetch request filesize from stat() */
st.req_filesize = file.st_size;
/* Everyone must have read access but no write access */
if ((file.st_mode & S_IROTH) == 0)
die(&st, ERR_ACCESS, "File or directory not world-readable");
if ((file.st_mode & S_IWOTH) != 0)
die(&st, ERR_ACCESS, "File or directory world-writeable");
/* If stat said it was a dir then it's a menu */
if ((file.st_mode & S_IFMT) == S_IFDIR) st.req_filetype = TYPE_MENU;
/* Not a dir - let's guess the filetype again... */
else if ((file.st_mode & S_IFMT) == S_IFREG)
st.req_filetype = gopher_filetype(&st, st.req_realpath, st.opt_magic);
/* Menu selectors must end with a slash */
if (st.req_filetype == TYPE_MENU && strlast(st.req_selector) != '/')
sstrlcat(st.req_selector, "/");
/* Change directory to wherever the resource was */
sstrlcpy(buf, st.req_realpath);
if ((file.st_mode & S_IFMT) != S_IFDIR) c = dirname(buf);
else c = buf;
if (chdir(c) == ERROR) die(&st, ERR_ACCESS, NULL);
/* Keep count of hits and data transfer */
#ifdef HAVE_SHMEM
if (shm) {
shm->hits++;
shm->kbytes += st.req_filesize / 1024;
/* Update user session */
update_shm_session(&st, shm);
}
#endif
/* Log the request */
if (st.opt_syslog) {
syslog(LOG_INFO, "request for \"gopher://%s:%i/%c%s\" from %s",
st.server_host,
st.server_port,
st.req_filetype,
st.req_selector,
st.req_remote_addr);
}
/* Check file type & act accordingly */
switch (file.st_mode & S_IFMT) {
case S_IFDIR:
log_combined(&st, HTTP_OK);
gopher_menu(&st);
break;
case S_IFREG:
log_combined(&st, HTTP_OK);
gopher_file(&st);
break;
default:
die(&st, ERR_ACCESS, "Refusing to serve out special files");
}
/* Clean exit */
return OK;
}
/*
* Initialize state struct to default/empty values
*/
void init_state(state *st)
{
static const char *filetypes[] = { FILETYPES };
char buf[BUFSIZE];
char *c;
int i;
/* Request */
strclear(st->req_selector);
strclear(st->req_realpath);
strclear(st->req_query_string);
strclear(st->req_referrer);
sstrlcpy(st->req_local_addr, get_local_address());
sstrlcpy(st->req_remote_addr, get_peer_address());
/* strclear(st->req_remote_host); */
st->req_filetype = DEFAULT_TYPE;
st->req_protocol = PROTO_GOPHER;
st->req_filesize = 0;
/* Output */
st->out_width = DEFAULT_WIDTH;
st->out_charset = DEFAULT_CHARSET;
/* Settings */
sstrlcpy(st->server_root, DEFAULT_ROOT);
sstrlcpy(st->server_host_default, DEFAULT_HOST);
if ((c = getenv("HOSTNAME")))
sstrlcpy(st->server_host, c);
else if ((gethostname(buf, sizeof(buf))) != ERROR)
sstrlcpy(st->server_host, buf);
st->server_port = DEFAULT_PORT;
st->default_filetype = DEFAULT_TYPE;
sstrlcpy(st->map_file, DEFAULT_MAP);
sstrlcpy(st->tag_file, DEFAULT_TAG);
sstrlcpy(st->cgi_file, DEFAULT_CGI);
sstrlcpy(st->user_dir, DEFAULT_USERDIR);
strclear(st->log_file);
st->hidden_count = 0;
st->filetype_count = 0;
strclear(st->filter_dir);
st->rewrite_count = 0;
strclear(st->server_description);
strclear(st->server_location);
strclear(st->server_platform);
strclear(st->server_admin);
/* Session */
st->session_timeout = DEFAULT_SESSION_TIMEOUT;
st->session_max_kbytes = DEFAULT_SESSION_MAX_KBYTES;
st->session_max_hits = DEFAULT_SESSION_MAX_HITS;
/* Feature options */
st->opt_vhost = TRUE;
st->opt_parent = TRUE;
st->opt_header = TRUE;
st->opt_footer = TRUE;
st->opt_date = TRUE;
st->opt_syslog = TRUE;
st->opt_magic = TRUE;
st->opt_iconv = TRUE;
st->opt_query = TRUE;
st->opt_caps = TRUE;
st->opt_shm = TRUE;
st->opt_root = TRUE;
st->debug = FALSE;
/* Load default suffix -> filetype mappings */
for (i = 0; filetypes[i]; i += 2) {
if (st->filetype_count < MAX_FILETYPES) {
sstrlcpy(st->filetype[st->filetype_count].suffix, filetypes[i]);
st->filetype[st->filetype_count].type = *filetypes[i + 1];
st->filetype_count++;
}
}
}
/*
* Convert gopher selector to an absolute path
*/
void selector_to_path(state *st)
{
DIR *dp;
struct dirent *dir;
struct stat file;
#ifdef HAVE_PASSWD
struct passwd *pwd;
char *path = EMPTY;
char *c;
#endif
char buf[BUFSIZE];
int i;
/* Handle selector rewriting */
for (i = 0; i < st->rewrite_count; i++) {
/* Match found? */
if (strstr(st->req_selector, st->rewrite[i].match) == st->req_selector) {
/* Replace match with a new string */
snprintf(buf, sizeof(buf), "%s%s",
st->rewrite[i].replace,
st->req_selector + strlen(st->rewrite[i].match));
if (st->debug) {
syslog(LOG_INFO, "rewriting selector \"%s\" -> \"%s\"",
st->req_selector, buf);
}
sstrlcpy(st->req_selector, buf);
}
}
#ifdef HAVE_PASSWD
/* Virtual userdir (~user -> /home/user/public_gopher)? */
if (*(st->user_dir) && sstrncmp(st->req_selector, "/~") == MATCH) {
/* Parse userdir login name & path */;
sstrlcpy(buf, st->req_selector + 2);
if ((c = strchr(buf, '/'))) {
*c = '\0';
path = c + 1;
}
/* Check user validity */
if ((pwd = getpwnam(buf)) == NULL)
die(st, ERR_NOTFOUND, "User not found");
if (pwd->pw_uid < PASSWD_MIN_UID)
die(st, ERR_NOTFOUND, "User found but UID too low");
/* Generate absolute path to users own gopher root */
snprintf(st->req_realpath, sizeof(st->req_realpath),
"%s/%s/%s", pwd->pw_dir, st->user_dir, path);
/* Check ~public_gopher access rights */
if (stat(st->req_realpath, &file) == ERROR)
die(st, ERR_NOTFOUND, NULL);
if ((file.st_mode & S_IROTH) == 0)
die(st, ERR_ACCESS, "~/public_gopher not world-readable");
if (file.st_uid != pwd->pw_uid)
die(st, ERR_ACCESS, "~/ and ~/public_gopher owned by different users");
/* Userdirs always come from the default vhost */
if (st->opt_vhost)
sstrlcpy(st->server_host, st->server_host_default);
return;
}
#endif
/* Virtual hosting */
if (st->opt_vhost) {
/* Try looking for the selector from the current vhost */
snprintf(st->req_realpath, sizeof(st->req_realpath), "%s/%s%s",
st->server_root, st->server_host, st->req_selector);
if (stat(st->req_realpath, &file) == OK) return;
/* Loop through all vhosts looking for the selector */
if ((dp = opendir(st->server_root)) == NULL) die(st, ERR_NOTFOUND, NULL);
while ((dir = readdir(dp))) {
/* Skip .hidden dirs and . & .. */
if (dir->d_name[0] == '.') continue;
/* Special case - skip lost+found (don't ask) */
if (sstrncmp(dir->d_name, "lost+found") == MATCH) continue;
/* Generate path to the found vhost */
snprintf(st->req_realpath, sizeof(st->req_realpath), "%s/%s%s",
st->server_root, dir->d_name, st->req_selector);
/* Did we find the selector under this vhost? */
if (stat(st->req_realpath, &file) == OK) {
/* Virtual host found - update state & return */
sstrlcpy(st->server_host, dir->d_name);
return;
}
}
closedir(dp);
}
/* Handle normal selectors */
snprintf(st->req_realpath, sizeof(st->req_realpath),
"%s%s", st->server_root, st->req_selector);
}
void update_shm_session(state *st, shm_state *shm)
{
time_t now;
char buf[BUFSIZE];
int delay;
int i;
/* Get current time */
now = time(NULL);
/* No existing session found? */
if ((i = get_shm_session_id(st, shm)) == ERROR) {
/* Look for an empty/expired session slot */
for (i = 0; i < SHM_SESSIONS; i++) {
if ((now - shm->session[i].req_atime) > st->session_timeout) {
/* Found slot -> initialize it */
sstrlcpy(shm->session[i].req_remote_addr, st->req_remote_addr);
shm->session[i].hits = 0;
shm->session[i].kbytes = 0;
shm->session[i].session_id = rand();
break;
}
}
}
/* No available session slot found? */
if (i == SHM_SESSIONS) return;
/* Get referrer from old session data */
if (*shm->session[i].server_host) {
snprintf(buf, sizeof(buf), "gopher://%s:%i/%c%s",
shm->session[i].server_host,
shm->session[i].server_port,
shm->session[i].req_filetype,
shm->session[i].req_selector);
sstrlcpy(st->req_referrer, buf);
}
/* Get public session id */
st->session_id = shm->session[i].session_id;
/* Update session data */
sstrlcpy(shm->session[i].server_host, st->server_host);
shm->session[i].server_port = st->server_port;
sstrlcpy(shm->session[i].req_selector, st->req_selector);
shm->session[i].req_filetype = st->req_filetype;
shm->session[i].req_atime = now;
shm->session[i].hits++;
shm->session[i].kbytes += st->req_filesize / 1024;
/* Transfer limits exceeded? */
if ((st->session_max_kbytes && shm->session[i].kbytes > st->session_max_kbytes) ||
(st->session_max_hits && shm->session[i].hits > st->session_max_hits)) {
/* Calculate throttle delay */
delay = max(shm->session[i].kbytes / st->session_max_kbytes,
shm->session[i].hits / st->session_max_hits);
/* Throttle user */
syslog(LOG_INFO, "throttling user from %s for %i seconds",
st->req_remote_addr, delay);
sleep(delay);
}
}
/*
* Handle gopher menus
*/
void gopher_menu(state *st)
{
FILE *fp;
sdirent dir[MAX_SDIRENT];
struct tm *ltime;
struct stat file;
char buf[BUFSIZE];
char pathname[BUFSIZE];
char displayname[BUFSIZE];
char encodedname[BUFSIZE];
char timestr[20];
char sizestr[20];
char *parent;
char *c;
char type;
int width;
int num;
int i;
int n;
/* Check for a gophermap */
snprintf(pathname, sizeof(pathname), "%s/%s",
st->req_realpath, st->map_file);
if (stat(pathname, &file) == OK &&
(file.st_mode & S_IFMT) == S_IFREG) {
/* Parse gophermap */
if (gophermap(st, pathname, 0) == QUIT) {
footer(st);
return;
}
}
else {
/* Check for a gophertag */
snprintf(pathname, sizeof(pathname), "%s/%s",
st->req_realpath, st->tag_file);
if (stat(pathname, &file) == OK &&
(file.st_mode & S_IFMT) == S_IFREG) {
/* Read & output gophertag */
if ((fp = fopen(pathname , "r"))) {
fgets(buf, sizeof(buf), fp);
chomp(buf);
info(st, buf, TYPE_TITLE);
info(st, EMPTY, TYPE_INFO);
fclose(fp);
}
}
/* No gophermap or tag found - print default header */
else if (st->opt_header) {
/* Use the selector as menu title */
sstrlcpy(displayname, st->req_selector);
/* Shorten too long titles */
while (strlen(displayname) > (st->out_width - sizeof(HEADER_FORMAT))) {
if ((c = strchr(displayname, '/')) == NULL) break;
if (!*++c) break;
sstrlcpy(displayname, c);
}
/* Output menu title */
snprintf(buf, sizeof(buf), HEADER_FORMAT, displayname);
info(st, buf, TYPE_TITLE);
info(st, EMPTY, TYPE_INFO);
}
}
/* Scan the directory */
num = sortdir(st->req_realpath, dir, MAX_SDIRENT);
if (num < 0) die(st, ERR_NOTFOUND, "WTF?");
/* Create link to parent directory */
if (st->opt_parent) {
sstrlcpy(buf, st->req_selector);
parent = dirname(buf);
/* Root has no parent */
if (strcmp(st->req_selector, ROOT) != MATCH) {
/* Prevent double-slash */
if (strcmp(parent, ROOT) == MATCH) parent++;
/* Print link */
printf("1%-*s\t%s/\t%s\t%i" CRLF,
st->opt_date ? (st->out_width - 1) : (int) strlen(PARENT),
PARENT, parent, st->server_host, st->server_port);
}
}
/* Width of filenames for fancy listing */
width = st->out_width - DATE_WIDTH - 15;
/* Loop through the directory entries */
for (i = 0; i < num; i++) {
/* Get full path+name */
snprintf(pathname, sizeof(pathname), "%s/%s",
st->req_realpath, dir[i].name);
/* Skip dotfiles and non world-readables */
if (dir[i].name[0] == '.') continue;
if ((dir[i].mode & S_IROTH) == 0) continue;
/* Skip gophermaps and tags (but not dirs) */
if ((dir[i].mode & S_IFMT) != S_IFDIR) {
if (strcmp(dir[i].name, st->map_file) == MATCH) continue;
if (strcmp(dir[i].name, st->tag_file) == MATCH) continue;
}
/* Skip files marked for hiding */
for (n = 0; n < st->hidden_count; n++)
if (strcmp(dir[i].name, st->hidden[n]) == MATCH) break;
if (n < st->hidden_count) continue; /* Cruel hack... */
/* Generate display name with correct output charset */
if (st->opt_iconv)
sstrniconv(st->out_charset, displayname, dir[i].name);
else
sstrlcpy(displayname, dir[i].name);
/* #OCT-encode filename */
strnencode(encodedname, dir[i].name, sizeof(encodedname));
/* Handle inline .gophermap */
if (strstr(displayname, st->map_file) > displayname) {
gophermap(st, pathname, 0);
continue;
}
/* Handle directories */
if ((dir[i].mode & S_IFMT) == S_IFDIR) {
/* Check for a gophertag */
snprintf(buf, sizeof(buf), "%s/%s",
pathname, st->tag_file);
if (stat(buf, &file) == OK &&
(file.st_mode & S_IFMT) == S_IFREG) {
/* Use the gophertag as displayname */
if ((fp = fopen(buf , "r"))) {
fgets(buf, sizeof(buf), fp);
chomp(buf);
fclose(fp);
/* Skip empty gophertags */
if (*buf) {
/* Convert to output charset */
if (st->opt_iconv) sstrniconv(st->out_charset, displayname, buf);
else sstrlcpy(displayname, buf);
}
}
}
/* Dir listing with dates */
if (st->opt_date) {
ltime = localtime(&dir[i].mtime);
strftime(timestr, sizeof(timestr), DATE_FORMAT, ltime);
/* Hack to get around UTF-8 byte != char */
n = width - strcut(displayname, width);
strrepeat(buf, ' ', n);
printf("1%s%s %s - \t%s%s/\t%s\t%i" CRLF,
displayname,
buf,
timestr,
st->req_selector,
encodedname,
st->server_host,
st->server_port);
}
/* Regular dir listing */
else {
strcut(displayname, st->out_width);
printf("1%s\t%s%s/\t%s\t%i" CRLF,
displayname,
st->req_selector,
encodedname,
st->server_host,
st->server_port);
}
continue;
}
/* Skip special files (sockets, fifos etc) */
if ((dir[i].mode & S_IFMT) != S_IFREG) continue;
/* Get file type */
type = gopher_filetype(st, pathname, st->opt_magic);
/* File listing with dates & sizes */
if (st->opt_date) {
ltime = localtime(&dir[i].mtime);
strftime(timestr, sizeof(timestr), DATE_FORMAT, ltime);
strfsize(sizestr, dir[i].size, sizeof(sizestr));
/* Hack to get around UTF-8 byte != char */
n = width - strcut(displayname, width);
strrepeat(buf, ' ', n);
printf("%c%s%s %s %s\t%s%s\t%s\t%i" CRLF, type,
displayname,
buf,
timestr,
sizestr,
st->req_selector,
encodedname,
st->server_host,
st->server_port);
}
/* Regular file listing */
else {
strcut(displayname, st->out_width);
printf("%c%s\t%s%s\t%s\t%i" CRLF, type,
displayname,
st->req_selector,
encodedname,
st->server_host,
st->server_port);
}
}
/* Print footer */
footer(st);
}
/*
* Handle gophermaps
*/
int gophermap(state *st, char *mapfile, int depth)
{
FILE *fp;
struct stat file;
char line[BUFSIZE];
#ifdef HAVE_POPEN
char command[BUFSIZE];
#endif
char *selector;
char *name;
char *host;
char *c;
char type;
int port;
int exe;
/* Prevent include loops */
if (depth > 4) return OK;
/* Try to figure out whether the map is executable */
if (stat(mapfile, &file) == OK) {
if ((file.st_mode & S_IXOTH)) {
#ifdef HAVE_POPEN
/* Quote the command in case path has spaces */
snprintf(command, sizeof(command), "'%s'", mapfile);
#endif
exe = TRUE;
}
else exe = FALSE;
}
/* This must be a shell include */
else {
#ifdef HAVE_POPEN
/* Let's assume the shell command runs as is without quoting */
sstrlcpy(command, mapfile);
#endif
exe = TRUE;
}
/* Debug output */
if (st->debug) {
if (exe) syslog(LOG_INFO, "parsing executable gophermap \"%s\"", mapfile);
else syslog(LOG_INFO, "parsing static gophermap \"%s\"", mapfile);
}
/* Try to execute or open the mapfile */
#ifdef HAVE_POPEN
if (exe) {
setenv_cgi(st, mapfile);
if ((fp = popen(command, "r")) == NULL) return OK;
}
else
#endif
if ((fp = fopen(mapfile, "r")) == NULL) return OK;
/* Read lines one by one */
while (fgets(line, sizeof(line) - 1, fp)) {
/* Parse type & name */
chomp(line);
type = line[0];
name = line + 1;
/* Ignore #comments */
if (type == '#') continue;
/* Stop handling gophermap? */
if (type == '*') return OK;
if (type == '.') return QUIT;
/* Print a list of users with public_gopher */
if (type == '~') {
#ifdef HAVE_PASSWD
userlist(st);
#endif
continue;
}
/* Print a list of available virtual hosts */
if (type == '%') {
if (st->opt_vhost) vhostlist(st);
continue;
}
/* Hide files in menus */
if (type == '-') {
if (st->hidden_count < MAX_HIDDEN)
sstrlcpy(st->hidden[st->hidden_count++], name);
continue;
}
/* Override filetype mappings */
if (type == ':') {
add_ftype_mapping(st, name);
continue;
}
/* Include gophermap or shell exec */
if (type == '=') {
gophermap(st, name, depth + 1);
continue;
}
/* Title resource */
if (type == TYPE_TITLE) {
info(st, name, TYPE_TITLE);
continue;
}
/* Print out non-resources as info text */
if (!strchr(line, '\t')) {
info(st, line, TYPE_INFO);
continue;
}
/* Parse selector */
selector = EMPTY;
if ((c = strchr(name, '\t'))) {
*c = '\0';
selector = c + 1;
}
if (!*selector) selector = name;
/* Parse host */
host = st->server_host;
if ((c = strchr(selector, '\t'))) {
*c = '\0';
host = c + 1;
}
/* Parse port */
port = st->server_port;
if ((c = strchr(host, '\t'))) {
*c = '\0';
port = atoi(c + 1);
}
/* Handle remote, absolute and hURL gopher resources */
if (sstrncmp(selector, "URL:") == MATCH ||
selector[0] == '/' ||
host != st->server_host) {
printf("%c%s\t%s\t%s\t%i" CRLF, type, name,
selector, host, port);
}
/* Handle relative resources */
else {
printf("%c%s\t%s%s\t%s\t%i" CRLF, type, name,
st->req_selector, selector, host, port);
/* Automatically hide manually defined selectors */
#ifdef ENABLE_AUTOHIDING
if (st->hidden_count < MAX_HIDDEN)
sstrlcpy(st->hidden[st->hidden_count++], selector);
#endif
}
}
/* Clean up & return */
#ifdef HAVE_POPEN
if (exe) pclose(fp);
else
#endif
fclose(fp);
return QUIT;
}