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mgod.c
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mgod.c
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/* mgod: mini gopher server for inetd
* Copyright (C) 2006-2008 Máté Nagy <[email protected]>
* Available under: GPL (version 3), see file "COPYING"
* -> gopher://port70.net/1mgod
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <strings.h>
#include <dirent.h>
#include <time.h>
#include <stdarg.h>
#include <ctype.h>
#include <netinet/in.h>
#include <arpa/inet.h>
/* size of maximum request string and config file line */
#define REQBUF 512
/* buffer size for file serving */
#define SERVBUF 2048
/* name of directory listing config file */
char DIRLIST[40] = ".gopher";
/* name of inheriting config file */
char INFCONFIG[40] = ".gopher.rec";
/* dirlist file extension */
#define DIRLISTEXT "g"
/* default server settings */
char * servername = "127.0.0.1";
int serverport = 70;
char * rootdir = "/var/gopher";
char * logfile = NULL;
/* file types */
char *filetypes[] = {
/* images */
"I", ".jpg.jpeg.jpe.png.bmp.",
"g", ".gif.",
/* binary formats */
"9", ".gz.tgz.tar.zip.bz2.rar.pdf.mid.xm.mod.",
";", ".avi.mp4.mpg.",
"s", ".wav.mp3.au.ogg.",
/* html */
"h", ".htm.html.swf.",
/* directory list */
"1", "." DIRLISTEXT ".",
NULL
};
/********************************** newhash */
typedef unsigned long int u4; /* unsigned 4-byte type */
typedef unsigned char u1; /* unsigned 1-byte type */
/* The mixing step */
#define mix(a,b,c) \
{ \
a=a-b; a=a-c; a=a^(c>>13); \
b=b-c; b=b-a; b=b^(a<<8); \
c=c-a; c=c-b; c=c^(b>>13); \
a=a-b; a=a-c; a=a^(c>>12); \
b=b-c; b=b-a; b=b^(a<<16); \
c=c-a; c=c-b; c=c^(b>>5); \
a=a-b; a=a-c; a=a^(c>>3); \
b=b-c; b=b-a; b=b^(a<<10); \
c=c-a; c=c-b; c=c^(b>>15); \
}
/* The whole new hash function */
u4 hash(k_str, length, initval)
const char *k_str; /* the key */
u4 length; /* the length of the key in bytes */
u4 initval; /* the previous hash, or an arbitrary value */
{
register const u1 *k = (const u1 *)k_str;
register u4 a,b,c; /* the internal state */
u4 len; /* how many key bytes still need mixing */
/* Set up the internal state */
len = length;
a = b = 0x9e3779b9; /* the golden ratio; an arbitrary value */
c = initval; /* variable initialization of internal state */
/*---------------------------------------- handle most of the key */
while (len >= 12)
{
a=a+(k[0]+((u4)k[1]<<8)+((u4)k[2]<<16) +((u4)k[3]<<24));
b=b+(k[4]+((u4)k[5]<<8)+((u4)k[6]<<16) +((u4)k[7]<<24));
c=c+(k[8]+((u4)k[9]<<8)+((u4)k[10]<<16)+((u4)k[11]<<24));
mix(a,b,c);
k = k+12; len = len-12;
}
/*------------------------------------- handle the last 11 bytes */
c = c+length;
switch(len) /* all the case statements fall through */
{
case 11: c=c+((u4)k[10]<<24);
case 10: c=c+((u4)k[9]<<16);
case 9 : c=c+((u4)k[8]<<8);
/* the first byte of c is reserved for the length */
case 8 : b=b+((u4)k[7]<<24);
case 7 : b=b+((u4)k[6]<<16);
case 6 : b=b+((u4)k[5]<<8);
case 5 : b=b+k[4];
case 4 : a=a+((u4)k[3]<<24);
case 3 : a=a+((u4)k[2]<<16);
case 2 : a=a+((u4)k[1]<<8);
case 1 : a=a+k[0];
/* case 0: nothing left to add */
}
mix(a,b,c);
/*-------------------------------------------- report the result */
return c;
}
/***********************************************************************/
/* maximum number of directory list entries to print */
int limit = -1;
/* output a single line, then \r\n EOL */
void outln(const char *str)
{
fputs(str, stdout);
fputs("\r\n", stdout);
}
/* print error message */
void errormsg(const char *e)
{
printf("3%s\tfake\t(NULL)\t0\r\n.\r\n", e);
}
/* print info line */
void infoline(char *str)
{
putchar('i');
fputs(str, stdout);
outln("\tfake\t(NULL)\t0");
}
/* append to log */
void logprintf(const char *format, ...)
{
FILE *fp;
va_list ap;
if(!logfile) return;
fp = fopen(logfile, "a");
if(!fp) {
perror("can't open log file");
return;
}
va_start(ap, format);
vfprintf(fp, format, ap);
va_end(ap);
fclose(fp);
}
/********************************** path */
/* structure for keeping current path */
typedef struct node node;
struct node {
char *text;
node *next;
};
/* current path */
node *path = NULL;
/* make a path node */
node *mkpn(const char *tx) {
node *n = (node *) malloc(sizeof(node));
if(!n) exit(1);
n->text = strdup(tx);
n->next = NULL;
return n;
}
/********************************** directory processors */
/* structure for keeping directory processors */
typedef struct dirproc dirproc;
struct dirproc {
char *name;
char *cmd;
int raw;
dirproc *next;
};
/* directory processors */
dirproc *dirprocs = NULL;
/* record a directory processor */
void adddirproc(char *name, char *cmd)
{
dirproc *n = (dirproc *) malloc(sizeof(dirproc));
n->name = strdup(name);
n->cmd = strdup(cmd);
n->next = dirprocs;
n->raw = 0;
dirprocs = n;
}
/* look up dirproc command by name */
dirproc *getdirproc(char *name)
{
dirproc *n;
for(n = dirprocs; n; n=n->next) {
if(!strcmp(n->name, name)) return n;
}
return NULL;
}
/* empty the list of dirprocs */
void cleardirprocs()
{
dirproc *n, *m = NULL;
for(n = dirprocs; n; n = n->next) {
free(m);
free(n->name);
free(n->cmd);
m = n;
}
free(m);
dirprocs = NULL;
}
/********************************** file name aliases */
/* structure for keeping file name aliases */
typedef struct alias alias;
struct alias {
u4 nhash;
char *name;
char *value;
struct alias *left;
struct alias *right;
};
alias *aliases = NULL;
/* create name alias node */
alias *mkalias(u4 nhash, const char *name, const char *value) {
alias *n = (alias *) malloc(sizeof(alias));
if(!n) exit(1);
n->nhash = nhash;
n->name = strdup(name);
n->value = strdup(value);
n->left = NULL;
n->right = NULL;
return n;
}
/* register name alias */
void regalias(char *name, const char *value) {
alias *n;
u4 nhash;
if(!aliases) {
aliases = mkalias(hash(name, strlen(name), 0), name, value);
return;
}
n = aliases;
nhash = hash(name, strlen(name), 0);
for(;;) {
if(n->nhash == nhash) {
if(strcmp(n->name, name)) {
if(n->left) {
n = n->left;
continue;
}
n->left = mkalias(nhash, name, value);
return;
} else {
n->value = strdup(value);
return;
}
} else if(nhash < n->nhash) {
if(n->left) {
n = n->left;
continue;
}
n->left = mkalias(nhash, name, value);
return;
} else {
if(n->right) {
n = n->right;
continue;
}
n->right = mkalias(nhash, name, value);
return;
}
}
}
/* retrieve alias by name */
char * getalias(const char *name) {
alias *n;
u4 nhash;
nhash = hash(name, strlen(name), 0);
n = aliases;
if(!n) return NULL;
for(;;) {
if(n->nhash == nhash) {
if(strcmp(n->name, name)) {
if(n->left) {
n = n->left;
continue;
}
return NULL;
} else return n->value;
} else if(nhash < n->nhash) {
if(n->left) {
n = n->left;
continue;
}
return NULL;
} else {
if(n->right) {
n = n->right;
continue;
}
return NULL;
}
}
}
/***********************************************************************/
/* helper functions for directory listing */
int dirfilter(const struct dirent *a)
{
if(a->d_name[0] == '.') return 0;
return 1;
}
/* file list generation properties */
int dirsortmode = 0;
int genlist = 1;
int listrev = 0;
int blogmode = 0;
int dirfirst = 1;
int textsummary = 0;
/* callback function for directory sorting */
int dirsort(const struct dirent **a, const struct dirent **b)
{
struct stat abuf, bbuf;
if(stat((*a)->d_name, &abuf)) return 0;
if(stat((*b)->d_name, &bbuf)) return 0;
if(dirfirst) {
if(S_ISDIR(abuf.st_mode) && !S_ISDIR(bbuf.st_mode)) return -1;
if(!S_ISDIR(abuf.st_mode) && S_ISDIR(bbuf.st_mode)) return 1;
}
switch(dirsortmode) {
case 1:
if(abuf.st_mtime < bbuf.st_mtime) return -1;
if(abuf.st_mtime > bbuf.st_mtime) return 1;
return strverscmp((*a)->d_name, (*b)->d_name);
default:
return strverscmp((*a)->d_name, (*b)->d_name);
}
}
/* print directory entry */
void printentry(char *e)
{
struct stat stbuf;
char *ext = NULL;
node *no;
char menuchar;
char *desc;
struct tm *mt;
char *fil = e; // file system name
int absolute = 0;
if(e[0] == '/') {
/* when given an absolute path, prepend server root... */
fil = (char *) alloca(strlen(rootdir) + strlen(e));
sprintf(fil, "%s%s", rootdir, e);
absolute = 1;
e ++;
}
if(stat(fil, &stbuf)) {
errormsg("can't stat file");
return;
}
if(!(stbuf.st_mode & S_IROTH)) {
/* not readable by all; skip */
return;
}
/* determine menu char */
if(S_ISDIR(stbuf.st_mode)) {
menuchar = '1';
} else if(S_ISREG(stbuf.st_mode)) {
ext = strrchr(e, '.');
if(ext) {
char **ft = filetypes;
char extwdot[9];
if(strlen(ext) > 7) {
menuchar = '0';
} else {
strcpy(extwdot, ext);
strcat(extwdot, ".");
for(; *ft; ft ++) {
char mch = *ft[0]; ft++;
if(strcasestr(*ft, extwdot)) {
menuchar = mch;
break;
}
}
if(!(*ft)) menuchar = '0';
}
ext ++; // skip dot
} else {
menuchar = '0';
}
} else {
return;
}
/* whether we're cutting off the .g ... */
int dotg = 0;
/* determine description */
desc = getalias(e);
if(desc) {
if(desc[0] == 0) return; /* desc aliased to empty; skip */
} else {
desc = e;
/* cut off .g from extension */
if(menuchar == '1' && ext && !strcasecmp(ext, DIRLISTEXT)) {
dotg = 1;
ext -= strlen(DIRLISTEXT);
*ext = 0;
}
}
putchar(menuchar);
mt = localtime(&stbuf.st_mtime);
if(blogmode) {
printf("%04d-%02d-%02d ", mt->tm_year + 1900, mt->tm_mon + 1, mt->tm_mday);
}
printf("%s\t", desc);
if(dotg) {
/* replace dot in the .g */
*ext = '.';
}
if(!absolute) {
/* print path */
for(no = path; no; no=no->next)
printf("%s/", no->text);
}
printf("%s\t%s\t%d\r\n", e, servername, serverport);
if(textsummary > 0 && menuchar == '0') {
/* output text summary for plain text file */
char buf[REQBUF];
FILE *fp = fopen(fil, "r");
if(fp) {
int i = 0;
int spccnt = 0;
while(!feof(fp) && i < textsummary) {
int c = fgetc(fp);
if(isspace(c)) {
c = ' ';
spccnt ++;
if(spccnt > 2) continue;
} else spccnt = 0;
if(isprint(c))
buf[i++] = c;
}
buf[i] = 0;
fclose(fp);
if(i > 0) infoline(buf);
}
}
}
/* special command token separator */
#define SPECSEP " \t"
void readdirlist(FILE *fp);
void runextern(char *ext);
/* interpret bang command */
void speccmd(char *cmd)
{
char *spec = strtok(cmd, SPECSEP);
if(!spec) {
errormsg("Empty ! command in config");
return;
}
if(!strcmp(spec, "nolist")) {
/* don't generate file list */
genlist = 0;
} else if(!strcmp(spec, "reverse")) {
/* reverse sort */
listrev = 1;
} else if(!strcmp(spec, "mtime")) {
/* sort by mtime */
dirsortmode = 1;
} else if(!strcmp(spec, "blog")) {
/* include mtime before file name in menu */
blogmode = 1;
} else if(!strcmp(spec, "dirmixed")) {
/* consider dirs as files while sorting */
dirfirst = 0;
} else if(!strcmp(spec, "summary")) {
/* enable text summary */
textsummary = 72;
char *sumlen = strtok(NULL, SPECSEP);
if(sumlen) textsummary = atoi(sumlen);
if(textsummary > REQBUF-1) textsummary = REQBUF-1;
if(textsummary < 0) textsummary = 0;
} else if(!strcmp(spec, "limit")) {
/* limit number of directory list entries */
char *slimit = strtok(NULL, SPECSEP);
if(slimit) limit = atoi(slimit); else limit = 20;
} else if(!strcmp(spec, "include")) {
/* include .gopher file */
char *file = strtok(NULL, "");
if(!file) {
errormsg("!include without arg in config");
return;
}
FILE *fp = fopen(file, "r");
if(!fp) {
errormsg("can't open !include file");
return;
}
readdirlist(fp);
fclose(fp);
} else if(!strcmp(spec, "proc")) {
/* include output from external processor */
char *ext = strtok(NULL, "");
if(!ext) {
errormsg("!proc without arg in config");
return;
}
runextern(ext);
} else if(!strcmp(spec, "dirproc") || !strcmp(spec, "dirproc-raw")) {
/* register directory processor */
char *name = strtok(NULL, SPECSEP);
if(!name) {
errormsg("!dirproc without name arg");
return;
}
char *cmd = strtok(NULL, "");
if(!cmd) {
errormsg("!dirproc without cmd arg");
return;
}
adddirproc(name, cmd);
if(!strcmp(spec, "dirproc-raw"))
dirprocs->raw = 1;
} else {
errormsg("Invalid !command in config");
}
}
/* print full version of link relative to current path */
void printrellink(const char *link)
{
node *no;
int sp = 0;
/* allocate enough space for full path + link string */
for(no = path; no; no=no->next)
sp += strlen(no->text) + 1;
sp += strlen(link) + 1;
char *buf = (char *) alloca(sp);
buf[0] = 0;
char *end = buf; // keep a pointer to the end of the buffer
/* append to the end of buffer */
inline void pathadd(const char *x, const char *until)
{
const char *c;
for(c = x; c != until && *c; c++)
*end++ = *c;
*end = 0;
}
/* append to the end of buffer
* add '/' if necessary */
inline void pathaddel(const char *x, const char *until)
{
if(end > buf) pathadd("/", NULL);
pathadd(x, until);
}
/* remove until last / */
inline void pathup()
{
char *c;
for(c = end; c > buf && *c != '/'; c --);
end = c;
*end = 0;
}
/* copy current path to buffer */
for(no = path; no; no=no->next) {
if(no != path) pathadd("/", NULL);
pathadd(no->text, NULL);
}
/* build path element by element */
const char *p = link;
const char *nd;
for(p = link; *p; p = nd + 1) {
nd = strchr(p, '/');
if(nd) {
if(!strncmp(".", p, nd - p)) continue;
else if(!strncmp("..", p, nd - p)) pathup();
else pathaddel(p, nd);
} else {
if(!strcmp(".", p)) continue;
else if(!strcmp("..", p)) pathup();
else pathaddel(p, NULL);
break;
}
}
/* print result */
fputs(buf, stdout);
}
/* process configuration file */
void readdirlist(FILE *fp)
{
char buf[REQBUF];
char *p;
while(!feof(fp)) {
if(!fgets(buf, REQBUF, fp)) break;
if(ferror(fp)) break;
if(ferror(stdout)) break;
for(p=buf; *p; p++)
if(*p == '\r' || *p == '\n')
{ *p = 0; break; }
switch(buf[0]) {
/* verbatim */
case ':':
outln(buf+1);
break;
/* verbatim local link */
case '.':
fputs(buf+1, stdout);
printf("\t%s\t%d\r\n", servername, serverport);
break;
/* local link, with path automatically prepended */
case '`':
p = strchr(buf+1, '\t');
if(p) {
*p = 0;
printf("%s\t", buf+1);
printrellink(p+1);
printf("\t%s\t%d\r\n", servername, serverport);
}
break;
/* special command */
case '!':
speccmd(buf + 1);
break;
/* comment */
case '#':
break;
/* description alias */
case '=':
p = strchr(buf+1, '\t');
if(*p) {
*p = 0;
regalias(p+1, buf+1);
}
break;
case '"':
/* verbatim info line */
infoline(buf + 1);
break;
/* info line */
default:
/* no special beginning characters.
* Let's try to find tabs */
{
char *info = buf;
char *sel = strchr(buf, '\t');
char *serv = NULL;
char *port = NULL;
if(!sel) {
/* just an infoline after all */
infoline(buf);
} else {
/* has tabs; try to interpret somewhat similarly
* to bucktooth (fill in missing fields) */
*sel++ = 0;
serv = strchr(sel, '\t');
if(serv) {
*serv++ = 0;
port = strchr(serv, '\t');
if(port) *port++ = 0;
}
if(!info[0]) {
/* missing info field */
if(!serv) {
/* if no serv specified, just do a printentry */
if(!strncmp(sel, "URL:", 4)) {
/* .. unless it begins with URL: */
printf("h%s\t%s\t%s\t%d\r\n", sel+4, sel, servername, serverport);
} else printentry(sel);
} else {
errormsg("known selector, but no info field on nonlocal serv");
}
} else {
/* info is specified. */
printf("%s\t", info);
if(!serv && sel[0] != '/' && strncmp(sel, "URL:", 4)) {
/* selector is relative and serv is local, print path */
printrellink(sel);
} else {
/* print selector verbatim */
if(sel[0] == '/') sel ++;
fputs(sel, stdout);
}
printf("\t%s\t%d\r\n", serv ? serv : servername,
port ? atoi(port) : (serv ? 70 : serverport));
}
}
}
}
}
}
/* directory listing */
void dirlist()
{
FILE *fp;
int n, i;
struct dirent **namelist;
/* process configuration file */
fp = fopen(DIRLIST, "r");
if(fp) {
readdirlist(fp);
fclose(fp);
}
/* generate directory listing */
if(genlist) {
n = scandir(".", &namelist, dirfilter, (int (*) (const struct dirent **, const struct dirent **) ) dirsort);
if(n < 0) {
perror("scandir");
exit(1);
}
if(listrev) {
while(n--) {
if(limit > -1) {
if(limit == 0) break;
limit --;
}
printentry(namelist[n]->d_name);
}
} else {
if(limit > -1) n = limit;
for(i=0; i<n; i++)
printentry(namelist[i]->d_name);
}
}
}
/* serve a file */
void serve(char *fn)
{
FILE *fp;
int r;
char buf[SERVBUF];
struct stat stbuf;
if(stat(fn, &stbuf)) {
errormsg("can't stat file");
exit(0);
}
if(!(stbuf.st_mode & S_IROTH)) {
/* not everyone has read access */
errormsg("access denied");
exit(0);
}
fp = fopen(fn, "rb");
if(!fp) {
errormsg("couldn't open file");
exit(0);
}
while((r = fread(buf, 1, SERVBUF, fp)) > 0) {
fwrite(buf, r, 1, stdout);
}
fclose(fp);
}
/* try to run/include an external processor */
void runextern(char *cmd)
{
FILE *fp = popen(cmd, "r");
if(!fp) {
errormsg("popen failed for runextern");
exit(0);
}
readdirlist(fp);
pclose(fp);
}
/* try to run/include a directory processor */
void rundirproc(dirproc *d, char *path)
{
setenv("QUERY", path, 1);
if(d->raw) {
char *args[4] = { "sh", "-c", d->cmd, NULL };
execv("/bin/sh", args);
errormsg("execv failed");
exit(0);
} else {
runextern(d->cmd);
}
}
/* print a stub for redirecting gopher+ clients to the non-gopher+ menu */
void gopherplus_stub(char *req)
{
/* this is a direct copy of the gopher.floodgap.com server notice */
outln("+-1");
printf("+INFO: 1Main menu (non-gopher+)\t\t%s\t%d\r\n", servername, serverport);
outln("+ADMIN:");
outln(" Admin: Server Administrator");
outln(" Server:");
outln("+VIEWS:");
outln(" application/gopher+-menu: <512b>");
outln("+ABSTRACT:");
outln(" This gopher supports standard gopher access only. Use this");
outln(" kludge to disable gopher+ client requests by your client.");
}
/* change to a directory; fail if directory is not readable by all */
void chdir_chk(const char *dir)
{
struct stat stbuf;
if(stat(dir, &stbuf)) {
errormsg("failed to stat directory");
exit(0);
}
if(!(stbuf.st_mode & S_IROTH)) {
errormsg("access to directory denied");
exit(0);
}
if(chdir(dir)) {
errormsg("chdir failed");
exit(0);
}
}
/* process request */
void procreq(char *request)
{
char *pathel;
char *sep;
struct stat stbuf;
node *no = NULL;
char *req = strsep(&request, "\t");
char *search = strsep(&request, "\t");
if(search) {
/* search string is specified */
if(!strcmp(search, "$")) {
/* gopher+ menu attempted, print gopher+ redirect */
gopherplus_stub(req);
exit(0);
}
/* set search string in environment
* (for the possibly run external search processor */
setenv("SEARCH", search, 1);
}
if(!strncmp(req, "URL:", 4)) {
/* generate html redirect page */
printf("<html><head>\r\n");
printf("<meta http-equiv=\"refresh\" content=\"5;url=%s\"/>\r\n", req+4);
printf("</head><body>\r\n");
printf("You'll be redirected in 5 seconds to:\r\n");
printf("<a href=\"%s\">%s</a>\r\n", req+4, req+4);
printf("</body></html>\r\n");
exit(0);
}
/* read .gopher.rec in server root if exists */
if(!stat(INFCONFIG, &stbuf)) {
FILE *fp = fopen(INFCONFIG, "r");
if(fp) {
readdirlist(fp);
fclose(fp);
}
}