/* * simple httpd to be started from tcpserver */ #define _FILE_OFFSET_BITS 64 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef min #define min(a,b) ((a)<(b)?(a):(b)) #endif /* * 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) #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) #define DUMP_buf(v, l) DUMPf("%s = %.*s", #v, (int)(l), v) /* * the following is the time in seconds that fnord should wait for a valid * HTTP request */ #define READTIMEOUT 2 /* * the following is the time in seconds that fnord should wait before * aborting a request when trying to write the answer */ #define WRITETIMEOUT 20 #define CGI_TIMEOUT (5*60) /* 5 minutes time-out for CGI to complete */ #ifdef __linux__ /* * defining USE_SENDFILE enables zero-copy TCP on Linux for static files. * I (Fefe) measured over 320 meg per second with apache bench over localhost * with sendfile and keep-alive. */ #define USE_SENDFILE #include #endif /* * Memory-mapping may result in a performance boost. thttpd does it, * but for a different reason (to cache frequently-accessed files). * XXX: Some performance testing is in order here. */ #ifdef _POSIX_MAPPED_FILES #define USE_MMAP #endif /* * TCP_CORK is a Linux extension to work around a TCP problem. * http://www.baus.net/on-tcp_cork has a good description. * XXX: Since we do our own buffering, TCP_CORK may not be helping * with anything. This needs testing. */ #ifdef TCP_CORK static int corked; #endif enum { UNKNOWN, GET, HEAD, POST } method; static long retcode = 404; /* used for logging code */ char *host = "?"; /* Host: header */ char *port; /* also Host: header, :80 part */ char *args; /* URL behind ? (for CGIs) */ char *url; /* string between GET and HTTP/1.0, * * demangled */ char *ua = "?"; /* user-agent */ char *refer; /* Referrer: header */ char *accept_enc; /* Accept-Encoding */ int httpversion; /* 0 == 1.0, 1 == 1.1 */ int keepalive = 0; /* should we keep the connection alive? */ int rootdir; /* fd of root directory, so we can fchdir * * back for keep-alive */ char *cookie; /* Referrer: header */ char *uri; /* copy of url before demangling */ char *content_type; char *content_len; char *auth_type; unsigned long post_len = 0; #if _FILE_OFFSET_BITS == 64 static unsigned long long rangestart, rangeend; /* for ranged queries */ #define strtorange strtoull #else static unsigned long rangestart, rangeend; /* for ranged queries */ #define strtorange strtoul #endif static const char days[] = "SunMonTueWedThuFriSat"; static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec"; #define MAXHEADERLEN 8192 char *remote_ip; char *remote_port; char *remote_ident; #define BUFFER_SIZE 8192 char stdout_buf[BUFFER_SIZE]; static void sanitize(char *ua) { /* replace strings with underscores for * * logging */ int j; if (!ua) return; for (j = 0; ua[j]; ++j) if (isspace(ua[j])) ua[j] = '_'; } static void dolog(off_t len) { /* write a log line to stderr */ sanitize(host); sanitize(ua); sanitize(refer); fprintf(stderr, "%s %ld %lu %s %s %s %s\n", remote_ip ? remote_ip : "0.0.0.0", retcode, (unsigned long) len, host, ua, refer, url); } /* * output an error message and exit */ static void badrequest(long code, const char *httpcomment, const char *message) { retcode = code; dolog(0); printf("HTTP/1.0 %ld %s\r\nConnection: close\r\n", code, httpcomment); if (message) { printf("Content-Length: %lu\r\nContent-Type: text/html\r\n\r\n", (unsigned long) (strlen(message) * 2) + 15); printf("%s%s", message, message); } else { fputs("\r\n", stdout); } fflush(stdout); exit(0); } #define CGIENVLEN 21 static const char *cgivars[CGIENVLEN] = { "GATEWAY_INTERFACE=", "SERVER_PROTOCOL=", "SERVER_SOFTWARE=", "SERVER_NAME=", "SERVER_PORT=", "REQUEST_METHOD=", "REQUEST_URI=", "SCRIPT_NAME=", "REMOTE_ADDR=", "REMOTE_PORT=", "REMOTE_IDENT=", "HTTP_USER_AGENT=", "HTTP_COOKIE=", "HTTP_REFERER=", "HTTP_ACCEPT_ENCODING=", "AUTH_TYPE=", "CONTENT_TYPE=", "CONTENT_LENGTH=", "QUERY_STRING=", "PATH_INFO=", "PATH_TRANSLATED=" }; static int iscgivar(const char *s) { int sl = strlen(s); register unsigned int i = 0; for (; i < CGIENVLEN; i++) if (!strncmp(s, cgivars[i], sl)) return 1; return 0; } static unsigned int elen(register const char *const *e) { register unsigned int i = 0; while (e[i]) i++; return i; } /* * Read header block. Try to read from stdin until \r?\n\r?\n is * encountered. Read no more than *buflen bytes. Convert bare \n to * \r\n. Preserve state across calls, provided buf is the same. Returns: * 1 found 0 not found, call again -1 EOF or other error */ static int read_header(FILE *f, char *buf, size_t * buflen) { /* * I'm not crazy about all these static variables. But the idea, * which seems to work, is that you pass in things like it was * a read call, and then just keep passing that same stuff in over * and over until it returns 0. * * Further down this winds up looking pretty nice. In here, sort * of gross. */ static char *lastbuf = NULL; static int found = 0; static int bare = 1; /* LF here would be bare */ static int bufsize = 0; if (lastbuf != buf) { lastbuf = buf; bare = 1; found = 0; bufsize = *buflen; *buflen = 0; } while (*buflen + bare < bufsize) { int c = fgetc(f); switch (c) { case EOF: if (errno == EWOULDBLOCK) { return 0; } else { return -1; } break; case '\r': bare = 0; break; case '\n': if (bare) { buf[(*buflen)++] = '\r'; bare = 1; } found += 1; break; default: found = 0; bare = 1; break; } buf[(*buflen)++] = c; if (found == 2) { return 1; } } return 0; } char * env_append(const char *key, const char *val) { static char buf[MAXHEADERLEN * 2 + PATH_MAX + 200]; static char *p = buf; char *ret = p; if (!key) { p = buf; return NULL; } p = stpcpy(p, key); *(p++) = '='; if (val) { p = stpcpy(p, val) + 1; } else { *(p++) = 0; } return ret; } static void do_cgi(const char *pathinfo, const char *const *envp) { const char *method_name[] = { "?", "GET", "HEAD", "POST" }; register unsigned int en = elen(envp); char **cgi_arg; register int i; char **cgi_env = (char **) alloca((CGIENVLEN + en + 1) * sizeof(char *)); cgi_env[0] = "GATEWAY_INTERFACE=CGI/1.1"; cgi_env[1] = "SERVER_PROTOCOL=HTTP/1.0"; cgi_env[2] = "SERVER_SOFTWARE=" FNORD; i = 3; env_append(NULL, NULL); cgi_env[i++] = env_append("SERVER_NAME", host); cgi_env[i++] = env_append("SERVER_PORT", port); cgi_env[i++] = env_append("REQUEST_METHOD", method_name[method]); cgi_env[i++] = env_append("REQUEST_URI", uri); cgi_env[i++] = env_append("SCRIPT_NAME", url); if (remote_ip) cgi_env[i++] = env_append("REMOTE_ADDR", remote_ip); if (remote_port) cgi_env[i++] = env_append("REMOTE_PORT", remote_port); if (remote_ident) cgi_env[i++] = env_append("REMOTE_IDENT", remote_ident); if (ua) cgi_env[i++] = env_append("HTTP_USER_AGENT", ua); if (cookie) cgi_env[i++] = env_append("HTTP_COOKIE", cookie); if (refer) cgi_env[i++] = env_append("HTTP_REFERER", refer); if (accept_enc) cgi_env[i++] = env_append("HTTP_ACCEPT_ENCODING", accept_enc); if (auth_type) cgi_env[i++] = env_append("AUTH_TYPE", auth_type); if (content_type) cgi_env[i++] = env_append("CONTENT_TYPE", content_type); if (content_type) cgi_env[i++] = env_append("CONTENT_LENGTH", content_len); if (args) cgi_env[i++] = env_append("QUERY_STRING", args); if (pathinfo) { char *rp = realpath(pathinfo, NULL); cgi_env[i++] = env_append("PATH_INFO", pathinfo); cgi_env[i++] = env_append("PATH_TRANSLATED", rp ? rp : pathinfo); if (rp) free(rp); } { unsigned int j = 0; for (; j < en; j++) if (!iscgivar(envp[j])) cgi_env[++i] = (char *) envp[j]; } cgi_env[++i] = 0; /* * argv */ if (args && (strchr(args, '=') == 0)) { int n = 3; for (i = 0; args[i]; ++i) if (args[i] == '+') ++n; cgi_arg = alloca(n * sizeof(char *)); cgi_arg[n = 1] = args; for (i = 0; args[i]; ++i) { if (args[i] == '+') { args[i] = 0; ++i; cgi_arg[++n] = args + i; } } cgi_arg[++n] = 0; } else { cgi_arg = alloca(2 * sizeof(char *)); cgi_arg[1] = 0; } { char tmp[PATH_MAX]; i = strrchr(url, '/') - url; if (i) { strncpy(tmp, url + 1, i); tmp[i] = 0; chdir(tmp); } } { char tmp[PATH_MAX]; /* * program name */ cgi_arg[0] = tmp; tmp[0] = '.'; strcpy(tmp + 1, url + i); /* * start cgi */ execve(cgi_arg[0], cgi_arg, cgi_env); raise(SIGQUIT); /* gateway unavailable. */ } } static void cgi_child(int sig) { int n, pid = waitpid(0, &n, WNOHANG); if (pid > 0) { if (WIFSIGNALED(n)) { if (WTERMSIG(n) == SIGALRM) badrequest(504, "Gateway Time-out", "Gateway has hit the Time-out."); else badrequest(502, "Bad Gateway", "Gateway broken or unavailable."); } } signal(SIGCHLD, cgi_child); } static void start_cgi(int nph, const char *pathinfo, const char *const *envp) { // XXX: Is it safe to reuse headerbuf from main? size_t size = 0; int pid; char cgiheader[BUFFER_SIZE]; size_t cgiheaderlen = BUFFER_SIZE; int cin[2]; int cout[2]; FILE *cinf; if (pipe(cin) || pipe(cout) || !(cinf = fdopen(cin[0], "rb"))) { badrequest(500, "Internal Server Error", "Server Resource problem."); } pid = fork(); if (-1 == pid) { badrequest(500, "Internal Server Error", "Unable to fork."); } if (pid) { /* Parent */ int passthru = nph; fcntl(cin[0], F_SETFL, O_NONBLOCK); signal(SIGCHLD, cgi_child); signal(SIGPIPE, SIG_IGN); /* NO! no signal! */ close(cin[1]); close(cout[0]); alarm(CGI_TIMEOUT); while (1) { int nfds; fd_set rfds, wfds; FD_ZERO(&rfds); FD_ZERO(&wfds); FD_SET(cin[0], &rfds); nfds = cin[0]; if (post_len) { /* have post data */ FD_SET(cout[1], &wfds); if (cout[1] > nfds) { nfds = cout[1]; } } else if (cout[1] >= 0) { close(cout[1]); /* no post data */ cout[1] = -1; } if (-1 == select(nfds+1, &rfds, &wfds, NULL, NULL)) { break; } if (FD_ISSET(cin[0], &rfds)) { if (passthru) { 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); size += len; } else { int ret; ret = read_header(cinf, cgiheader, &cgiheaderlen); if (0 == ret) { /* Call read_header again */ } else if (-1 == ret) { /* EOF or error */ badrequest(500, "CGI Error", "CGI output too weird"); } else { /* Entire header is in memory now */ passthru = 1; /* XXX: I think we need to look for Location: * anywhere, but fnord got away with checking * only the first header field, so I will too. */ if (memcmp(cgiheader, "Location: ", 10) == 0) { retcode = 302; printf ("HTTP/1.0 302 CGI-Redirect\r\nConnection: close\r\n"); fwrite(cgiheader, 1, cgiheaderlen, stdout); dolog(0); exit(0); } retcode = 200; printf("HTTP/1.0 200 OK\r\nServer: " FNORD "\r\nPragma: no-cache\r\nConnection: close\r\n"); signal(SIGCHLD, SIG_IGN); fwrite(cgiheader, 1, cgiheaderlen, stdout); } } } else if (FD_ISSET(cout[1], &wfds)) { /* * write to cgi the post data */ if (post_len) { size_t len; char buf[BUFFER_SIZE]; size_t nmemb = min(BUFFER_SIZE, post_len); len = fread(buf, 1, nmemb, stdin); if (len < 1) { break; } post_len -= len; write(cout[1], buf, len); } else { close(cout[1]); } } } alarm(0); fflush(stdout); dolog(size); #ifdef TCP_CORK { int zero = 0; setsockopt(1, IPPROTO_TCP, TCP_CORK, &zero, sizeof(zero)); } #endif } else { /* Child */ close(cout[1]); close(cin[0]); dup2(cout[0], 0); dup2(cin[1], 1); close(cout[0]); close(cin[1]); do_cgi(pathinfo, envp); } exit(0); } static int fromhex(int c) { if (c >= '0' && c <= '9') return c - '0'; else { c |= ' '; if (c >= 'a' && c <= 'f') return c - 'a' + 10; } return -1; } /* * header(buf,buflen,"User-Agent")="Mozilla" */ static char * header(char *buf, int buflen, const char *hname) { int slen = strlen(hname); int i; char *c; for (i = 0; i < buflen - slen - 2; ++i) { if (!strncasecmp(buf + i, hname, slen)) { if (i && (buf[i - 1] && buf[i - 1] != '\n')) continue; if (buf[i + slen] != ':' || buf[i + slen + 1] != ' ') continue; c = buf + i + slen + 2; i += slen + 2; for (; i < buflen; ++i) { if (buf[i] == 0 || buf[i] == '\n' || buf[i] == '\r') { buf[i] = 0; break; } } while (*c == ' ' || *c == '\t') ++c; return c; } } return 0; } static struct mimeentry { const char *name, *type; } mimetab[] = { { "html", "text/html; charset=UTF-8"}, { "htm", "text/html; charset=UTF-8"}, { "txt", "text/plain; charset=UTF-8"}, { "css", "text/css"}, { "ps", "application/postscript"}, { "pdf", "application/pdf"}, { "js", "application/javascript"}, { "gif", "image/gif"}, { "png", "image/png"}, { "jpeg", "image/jpeg"}, { "jpg", "image/jpeg"}, { "svg", "image/svg+xml"}, { "mpeg", "video/mpeg"}, { "mpg", "video/mpeg"}, { "avi", "video/x-msvideo"}, { "mov", "video/quicktime"}, { "qt", "video/quicktime"}, { "mp3", "audio/mpeg"}, { "ogg", "audio/ogg"}, { "wav", "audio/x-wav"}, { "epub", "application/epub+zip"}, { "dvi", "application/x-dvi"}, { "pac", "application/x-ns-proxy-autoconfig"}, { "sig", "application/pgp-signature"}, { "swf", "application/x-shockwave-flash"}, { "torrent", "application/x-bittorrent"}, { "tar", "application/x-tar"}, { "zip", "application/zip"}, { "dtd", "text/xml"}, { "xml", "text/xml"}, { "xbm", "image/x-xbitmap"}, { "xpm", "image/x-xpixmap"}, { "xwd", "image/x-xwindowdump"}, { "ico", "image/x-icon"}, { 0, 0}}; static const char *default_mimetype = "application/octet-stream"; /* * Determine MIME type from file extension */ static const char * getmimetype(char *url) { char *ext = strrchr(url, '.'); if (ext) { int i; ext++; for (i = 0; mimetab[i].name; ++i) { if (!strcmp(mimetab[i].name, ext)) { return mimetab[i].type; } } } return default_mimetype; } /* * timerfc function Copyright 1996, Michiel Boland. * All rights reserved. * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * 1. Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * 2. Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ static time_t timerfc(const char *s) { static const int daytab[2][12] = { {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}, {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335} }; unsigned sec, min, hour, day, mon, year; char month[3]; int c; unsigned n; char flag; char state; char isctime; enum { D_START, D_END, D_MON, D_DAY, D_YEAR, D_HOUR, D_MIN, D_SEC }; sec = 60; min = 60; hour = 24; day = 32; year = 1969; isctime = 0; month[0] = 0; state = D_START; n = 0; flag = 1; do { c = *s++; switch (state) { case D_START: if (c == ' ') { state = D_MON; isctime = 1; } else if (c == ',') state = D_DAY; break; case D_MON: if (isalpha(c)) { if (n < 3) month[n++] = c; } else { if (n < 3) return -1; n = 0; state = isctime ? D_DAY : D_YEAR; } break; case D_DAY: if (c == ' ' && flag); else if (isdigit(c)) { flag = 0; n = 10 * n + (c - '0'); } else { day = n; n = 0; state = isctime ? D_HOUR : D_MON; } break; case D_YEAR: if (isdigit(c)) n = 10 * n + (c - '0'); else { year = n; n = 0; state = isctime ? D_END : D_HOUR; } break; case D_HOUR: if (isdigit(c)) n = 10 * n + (c - '0'); else { hour = n; n = 0; state = D_MIN; } break; case D_MIN: if (isdigit(c)) n = 10 * n + (c - '0'); else { min = n; n = 0; state = D_SEC; } break; case D_SEC: if (isdigit(c)) n = 10 * n + (c - '0'); else { sec = n; n = 0; state = isctime ? D_YEAR : D_END; } break; } } while (state != D_END && c); switch (month[0]) { case 'A': mon = (month[1] == 'p') ? 4 : 8; break; case 'D': mon = 12; break; case 'F': mon = 2; break; case 'J': mon = (month[1] == 'a') ? 1 : ((month[2] == 'l') ? 7 : 6); break; case 'M': mon = (month[2] == 'r') ? 3 : 5; break; case 'N': mon = 11; break; case 'O': mon = 10; break; case 'S': mon = 9; break; default: return -1; } if (year <= 100) year += (year < 70) ? 2000 : 1900; --mon; --day; if (sec >= 60 || min >= 60 || hour >= 60 || day >= 31) return -1; if (year < 1970) return 0; return sec + 60L * (min + 60L * (hour + 24L * (day + daytab[year % 4 == 0 && (year % 100 || year % 400 == 0)][mon] + 365L * (year - 1970L) + ((year - 1969L) >> 2)))); } static struct stat st; /* * try to return a file */ static int doit(char *headerbuf, size_t headerlen, char *url) { int fd = -1; char *accept; while (url[0] == '/') ++url; if ((fd = open(url, O_RDONLY)) >= 0) { if (fstat(fd, &st)) goto bad; /* * no directories */ if (S_ISDIR(st.st_mode)) goto bad; /* * see if the document has been changed */ { char *field = header(headerbuf, headerlen, "If-Modified-Since"); if (field) { time_t ims; ims = timerfc(field); if ((ims != (time_t) - 1) && (st.st_mtime <= ims)) { retcode = 304; goto bad; } } } rangestart = 0; rangeend = st.st_size; if ((accept = header(headerbuf, headerlen, "Range"))) { /* * format: "bytes=17-23", "bytes=23-" */ if (!strncmp(accept, "bytes=", 6)) { accept += 6; rangestart = strtorange(accept, &accept, 10); if (*accept == '-') { ++accept; if (*accept) { rangeend = strtorange(accept, &accept, 10); if (!*accept) { rangeend = st.st_size; } else { ++rangeend; } } } } if (rangestart > rangeend || rangeend > st.st_size) { retcode = 416; goto bad; } } return fd; bad: if (fd >= 0) close(fd); } return -1; } static void redirectboilerplate() { printf ("HTTP/1.0 301 Go Away\r\nConnection: close\r\nContent-Length: 0\r\nLocation: "); } static void handleredirect(const char *url, const char *origurl) { char symlink[1024]; int len; while (*url == '/') ++url; if ((len = readlink(url, symlink, 1023)) > 0) { /* * el-cheapo redirection */ redirectboilerplate(); printf("%.*s", len, symlink); retcode = 301; printf("\r\n\r\n"); dolog(0); fflush(stdout); exit(0); } } static void hdl_encode_html(const char *s, unsigned int sl) { int i; for (i = 0; i < sl; ++i) { unsigned char ch = s[i]; if (ch > 159) { printf("&#%u;", ch); } else if ((ch > 128) || (ch < 32)) { putchar('_'); } else if (ch == '"') fputs(""", stdout); else if (ch == '&') fputs("&", stdout); else if (ch == '<') fputs("<", stdout); else if (ch == '>') fputs(">", stdout); else putchar(ch); } } static void hdl_encode_uri(const char *s, unsigned int sl) { int i; for (i = 0; i < sl; ++i) { unsigned char ch = s[i]; if ((ch != '%') && (ch > 32) && (ch < 127)) putchar(ch); else printf("%%%02x", ch); } } static void handledirlist(const char *origurl) { DIR *dir; unsigned int nl; const char *nurl = origurl; url = (char *) origurl; while (nurl[0] == '/') ++nurl; if (nurl <= origurl) return; nl = strlen(nurl); if (nl && (nurl[nl - 1] != '/')) return; if (!stat(nl ? nurl : ".", &st) && (S_ISDIR(st.st_mode)) && ((st.st_mode & S_IRWXO) == 5)) { if (nl) chdir(nurl); if ((dir = opendir("."))) { struct dirent *de; unsigned int i, size = 32 + nl; fputs("HTTP/1.0 200 OK\r\nServer: " FNORD "\r\nConnection: close\r\n", stdout); fputs("Content-Type: text/html; charset=utf-8\r\n", stdout); fputs("\r\n

Directory Listing: /", stdout); hdl_encode_html(nurl, nl); fputs("

\n
\n", stdout);
            if (nl != 0) {
                for (i = nl - 2; i > 0; --i)
                    if (nurl[i] == '/')
                        break;
                fputs(" 0)
                    fputs("/", stdout);
                fputs("\">Parent directory", stdout);
                fputs("\n", stdout);
                size += 40 + i;
            }
            while ((de = readdir(dir))) {
                char            symlink[1024];
                char           *p = de->d_name;
                unsigned int    pl,
                                dl = strlen(de->d_name);
                pl = dl;
                if (de->d_name[0] == '.')
                    continue;   /* hidden files -> skip */
                if (lstat(de->d_name, &st))
                    continue;   /* can't stat -> skip */
                if (S_ISDIR(st.st_mode))
                    fputs("[DIR] ", stdout);
                else if (S_ISLNK(st.st_mode)) {
                    if ((pl = readlink(de->d_name, symlink, 1023)) < 1)
                        continue;
                    p = symlink;
                    fputs("[LNK] ", stdout);    /* a symlink to *
                                                 * something ... */
                } else if (S_ISREG(st.st_mode))
                    fputs("[TXT] ", stdout);
                else
                    continue;   /* not a file we can provide -> skip */
                /*
                 * write a href 
                 */
                fputs("", stdout);
                if (de->d_name[0] == ':')
                    de->d_name[0] = '.';        /* fnord special ... */
                hdl_encode_html(de->d_name, dl);
                fputs("\n", stdout);
                size += 22 + (dl << 1);
            }
            closedir(dir);
            fputs("
\n", stdout); fflush(stdout); retcode = 200; dolog(size); exit(0); } } } static int handleindexcgi(const char *testurl, const char *origurl, char *space) { unsigned int ul, ol = strlen(origurl); char *test; while (testurl[0] == '/') ++testurl, --ol; ul = strlen(testurl); if (strcmp(testurl + ol, "index.html")) return 0; /* no request for index.html */ test = space; ++test; ul -= 4; memcpy(test, testurl, ul); test[ul] = 'c'; test[++ul] = 'g'; test[++ul] = 'i'; test[++ul] = 0; if (stat(test, &st)) return 0; /* no index.cgi present */ ul = 1; if (st.st_gid == getegid()) ul = 010; if (st.st_uid == geteuid()) ul = 0100; if (!(st.st_mode & ul)) return 0; /* should be executable */ *(--test) = '/'; url = test; return 1; /* Wow... now start "index.cgi" */ } static void get_ucspi_env(void) { char *ucspi = getenv("PROTO"); if (ucspi) { int protolen = strlen(ucspi); char *buf = alloca(protolen + 20); strcpy(buf, ucspi); strcpy(buf + protolen, "REMOTEIP"); remote_ip = getenv(buf); strcpy(buf + protolen, "REMOTEPORT"); remote_port = getenv(buf); strcpy(buf + protolen, "REMOTEINFO"); remote_ident = getenv(buf); } } static int findcgi(const char *c) { return (c[0] == '.' && c[1] == 'c' && c[2] == 'g' && c[3] == 'i' && (c[4] == '/' || c[4] == 0)); } static int serve_read_write(int fd) { char tmp[4096]; char *tmp2; int len; off_t todo = rangeend - rangestart; if (rangestart) lseek(fd, rangestart, SEEK_SET); while (todo > 0) { int olen; olen = len; tmp2 = tmp; while (len > 0) { int written; if ((written = write(1, tmp2, len)) < 0) { return -1; } len -= written; tmp2 += written; } todo -= olen; } return 0; } static int serve_mmap(int fd) { off_t mapstart, maplen; unsigned long mapofs; char *map, *tmp2; mapstart = rangestart & (~(off_t) 0xfff); /* round down to 4k page */ maplen = rangeend - mapstart; mapofs = rangestart - mapstart; if (maplen > 64 * 1024 * 1024) maplen = 64 * 1024 * 1024; map = mmap(0, maplen, PROT_READ, MAP_PRIVATE, fd, mapstart); if (map == MAP_FAILED) { if (errno == EINVAL && mapstart) { /* * try rounded to 64k pages */ mapstart = rangestart & 0xffff; maplen = rangeend - mapstart; mapofs = rangestart - mapstart; map = mmap(0, maplen, PROT_READ, MAP_PRIVATE, fd, mapstart); if (map == MAP_FAILED) /* * didn't work, use read/write instead. */ return serve_read_write(fd); } else return serve_read_write(fd); } while (rangestart < rangeend) { int len; len = maplen - mapofs; tmp2 = map + mapofs; while (len > 0) { int written; if ((written = write(1, tmp2, len)) < 0) { alarm(0); return -1; } len -= written; tmp2 += written; } rangestart += maplen - mapofs; mapstart += maplen; munmap(map, maplen); mapofs = 0; maplen = rangeend - mapstart; if (maplen) { if (maplen > 64 * 1024 * 1024) maplen = 64 * 1024 * 1024; map = mmap(0, maplen, PROT_READ, MAP_SHARED, fd, mapstart); if (map == MAP_FAILED) /* * can't happen, really */ return serve_read_write(fd); } } return 0; } /* * write from offset "rangestart" to offset "rangeend" to fd #1 */ static int serve_static_data(int fd) { off_t len = rangeend - rangestart; #ifdef TCP_CORK corked = 0; #endif if (len < 4096) { /* for small files, sendfile is actually * slower */ char tmp[4096]; if (rangestart) lseek(fd, rangestart, SEEK_SET); read(fd, tmp, len); /* if read fails, we can't back down now. * We already committed on the * content-length */ fwrite(tmp, len, 1, stdout); fflush(stdout); return 0; } #ifdef USE_SENDFILE { off_t offset = rangestart; #ifdef TCP_CORK { int one = 1; setsockopt(1, IPPROTO_TCP, TCP_CORK, &one, sizeof(one)); corked = 1; } #endif fflush(stdout); { off_t l = rangeend - rangestart; do { off_t c; c = (l > (1ul << 31)) ? 1ul << 31 : l; if (sendfile(1, fd, &offset, c) == -1) #ifdef USE_MMAP return serve_mmap(fd); #else return serve_read_write(fd); #endif l -= c; } while (l); } return 0; } #else fflush(stdout); #ifdef TCP_CORK { int one = 1; setsockopt(1, IPPROTO_TCP, TCP_CORK, &one, sizeof(one)); corked = 1; } #endif #ifdef USE_MMAP return serve_mmap(fd); #else return serve_read_write(fd); #endif #endif } int main(int argc, char *argv[], const char *const *envp) { char headerbuf[MAXHEADERLEN]; char *nurl, *origurl; int doauth = 0; int docgi = 0; int dirlist = 0; int redirect = 0; int portappend = 0; size_t headerlen; { int opt; while (-1 != (opt = getopt(argc, argv, "acdrp"))) { switch (opt) { case 'a': doauth = 1; break; case 'c': docgi = 1; break; case 'd': dirlist = 1; break; case 'r': redirect = 1; break; case 'p': portappend = 1; break; default: fprintf(stderr, "Usage: %s [-c] [-d] [-r] [-p]\n", argv[0]); return 69; } } } setbuffer(stdout, stdout_buf, sizeof stdout_buf); signal(SIGPIPE, SIG_IGN); get_ucspi_env(); handlenext: alarm(READTIMEOUT); headerlen = sizeof headerbuf; // XXX: I need a way to signal that this is a new read with the same buffer. switch (read_header(stdin, headerbuf, &headerlen)) { case -1: return 0; break; case 0: badrequest(400, "Bad Request", "Header too long"); break; } alarm(0); if (headerlen < 10) badrequest(400, "Bad Request", "That does not look like HTTP"); if (!memcmp(headerbuf, "GET /", 5)) { method = GET; url = headerbuf + 4; } else if (!memcmp(headerbuf, "POST /", 6)) { method = POST; url = headerbuf + 5; } else if (!memcmp(headerbuf, "HEAD /", 6)) { method = HEAD; url = headerbuf + 5; } else badrequest(405, "Method Not Allowed", "Unsupported HTTP method."); origurl = url; { /* * If we got here we are *guaranteed* (by read_header) to have at * least one \r */ char *nl = memchr(headerbuf, '\r', headerlen); char *space = memchr(url, ' ', nl - url); if (!space) { badrequest(400, "Bad Request", "HTTP/0.9 not supported"); } if (memcmp(space + 1, "HTTP/1.", 7)) badrequest(400, "Bad Request", "Only HTTP/1.x supported"); *space = 0; httpversion = space[8] - '0'; if (httpversion > 1) { badrequest(400, "Bad Request", "HTTP Version not supported"); } keepalive = 0; /* * demangle path in-place */ { register char *tmp, *d; for (tmp = d = url; *tmp; ++tmp) { if (*tmp == '?') { args = tmp + 1; break; } if (*tmp == ' ') break; if (*tmp == '%') { int a, b; a = fromhex(tmp[1]); b = fromhex(tmp[2]); if (a >= 0 && b >= 0) { *d = (a << 4) + b; tmp += 2; } else *d = *tmp; } else *d = *tmp; if (d > url + 1 && *d == '/' && d[-1] == ':' && d[-2] == '/') d -= 2; if (d > url && *d == '/' && d[-1] == '/') --d; if (d > url && *d == '.' && d[-1] == '/') *d = ':'; ++d; } *d = 0; } /* * XXX: check use of uri to see if it needs to be duplicated */ uri = strdup(url); } { char *tmp; ua = header(headerbuf, headerlen, "User-Agent"); refer = header(headerbuf, headerlen, "Referer"); accept_enc = header(headerbuf, headerlen, "Accept-Encoding"); if ((tmp = header(headerbuf, headerlen, "Connection"))) { /* see * if * it's * * * "keep-alive" * * or "close" */ if (!strcasecmp(tmp, "keep-alive")) keepalive = 1; else if (!strcasecmp(tmp, "close")) keepalive = -1; } cookie = header(headerbuf, headerlen, "Cookie"); auth_type = header(headerbuf, headerlen, "Authorization"); if (method == POST) { content_type = header(headerbuf, headerlen, "Content-Type"); content_len = header(headerbuf, headerlen, "Content-Length"); if ((!content_type) || (!content_len)) { badrequest(411, "Length Required", "POST missing Content-Type or Content-Length"); } post_len = strtoul(content_len, NULL, 10); } } port = getenv("TCPLOCALPORT"); if (!port) port = "80"; { char *Buf; int i; host = header(headerbuf, headerlen, "Host"); if (!host) i = 100; else i = strlen(host) + 7; Buf = alloca(i); if (!host) { char *ip = getenv("TCPLOCALIP"); if (!ip) ip = "127.0.0.1"; if (strlen(ip) + strlen(port) > 90) exit(101); if (portappend) { sprintf(Buf, "%s:%s", ip, port); } else { strcpy(Buf, ip); } host = Buf; } else { char *colon = strchr(host, ':'); if (portappend && !colon) { sprintf(Buf, "%s:%s", host, port); host = Buf; } else if (!portappend && colon) { *colon = '\0'; } } for (i = strlen(host); i >= 0; --i) if ((host[i] = tolower(host[i])) == '/') hostb0rken: badrequest(400, "Bad Request", "Invalid host header"); if (host[0] == '.') goto hostb0rken; if (keepalive > 0) { if ((rootdir = open(".", O_RDONLY)) < 0) keepalive = -1; } if (chdir(host)) { if (redirect) { char symlink[1024]; int linklen; if ((linklen = readlink(host, symlink, sizeof symlink)) > 0) { /* * it is a broken symlink. Do a redirection */ redirectboilerplate(); if (symlink[0] == '=') { fwrite(symlink + 1, linklen - 1, 1, stdout); } else { fwrite(symlink, linklen, 1, stdout); while (url[0] == '/') ++url; fputs(url, stdout); } retcode = 301; fputs("\r\n\r\n", stdout); dolog(0); fflush(stdout); exit(0); } } if (chdir("default") && argc < 2) { badrequest(404, "Not Found", "This host is not served here."); } } } if (doauth) { char *auth_script = ".http-auth"; struct stat st; if (!stat(auth_script, &st)) { pid_t child; const char *authorization; authorization = header(headerbuf, headerlen, "Authorization"); child = fork(); if (child < 0) { badrequest(500, "Internal Server Error", "Server Resource problem."); } else if (child == 0) { dup2(2, 1); setenv("HTTP_AUTHORIZATION", authorization, 1); execl(auth_script, auth_script, host, url, NULL); exit(1); } else { int status; pid_t childr; while ((childr = waitpid(child, &status, 0)) < 0 && errno == EINTR); if (childr != child) badrequest(500, "Internal Server Error", "Server system problem."); if (!WIFEXITED(status) || WEXITSTATUS(status)) { retcode = 401; dolog(0); fputs("HTTP/1.0 401 Authorization Required\r\n" "WWW-Authenticate: Basic realm=\"", stdout); fputs(host, stdout); fputs("\"\r\nConnection: close\r\n\r\n" "Access to this site is restricted.\r\n" "Please provide credentials.\r\n", stdout); fflush(stdout); exit(0); } } } } nurl = url + strlen(url); if (nurl > url) --nurl; if (*nurl == '/') { int i; nurl = alloca(strlen(url) + 12); i = sprintf(nurl, "%sindex.html", url); url = nurl; nurl = url + i; } nurl -= 3; if (docgi) { char *tmp, *pathinfo; pathinfo = 0; for (tmp = url; tmp < nurl; ++tmp) { if (findcgi(tmp)) { nurl = tmp; if (tmp[4] == '/') pathinfo = tmp + 4; break; } } if (pathinfo) { int len = strlen(pathinfo) + 1; tmp = alloca(len); memcpy(tmp, pathinfo, len); *pathinfo = 0; pathinfo = tmp; } if (findcgi(nurl)) { int i; if ((method == HEAD)) badrequest(400, "Bad Request", "Illegal HTTP method for Gateway call."); #ifdef TCP_CORK { int one = 1; setsockopt(1, IPPROTO_TCP, TCP_CORK, &one, sizeof(one)); } #endif for (i = nurl - url; i > -1; --i) { if ((nurl[0] == '/') && (nurl[1] == 'n') && (nurl[2] == 'p') && (nurl[3] == 'h') && (nurl[4] == '-')) start_cgi(1, pathinfo, envp); /* start a NPH-CGI */ --nurl; } indexcgi: start_cgi(0, pathinfo, envp); /* start a CGI */ } } { int fd; if ((fd = doit(headerbuf, headerlen, url)) >= 0) { /* * file was there */ retcode = 200; dolog(st.st_size); if (rangestart || rangeend != st.st_size) fputs("HTTP/1.0 206 Partial Content\r\n", stdout); else fputs("HTTP/1.0 200 OK\r\n", stdout); printf("Server: %s\r\n", FNORD); printf("Content-Type: %s\r\n", getmimetype(url)); switch (keepalive) { case -1: fputs("Connection: close\r\n", stdout); break; case 1: fputs("Connection: Keep-Alive\r\n", stdout); break; } printf("Content-Length: %llu\r\n", (unsigned long long) (rangeend - rangestart)); { /* * glibc's gmtime parses tzinfo, resulting in 9 * additional syscalls. uclibc doesn't do this. * I presume dietlibc doesn't either. */ struct tm *x = gmtime(&st.st_mtime); /* * "Sun, 06 Nov 1994 08:49:37 GMT" */ printf ("Last-Modified: %.3s, %02d %.3s %d %02d:%02d:%02d GMT\r\n", days + (3 * x->tm_wday), x->tm_mday, months + (3 * x->tm_mon), x->tm_year + 1900, x->tm_hour, x->tm_min, x->tm_sec); } if (rangestart || rangeend != st.st_size) { printf ("Accept-Ranges: bytes\r\nContent-Range: bytes %llu-%llu/%llu\r\n", (unsigned long long) rangestart, (unsigned long long) rangeend - 1, (unsigned long long) st.st_size); } fputs("\r\n", stdout); if (method == GET || method == POST) { int ret; alarm(WRITETIMEOUT); ret = serve_static_data(fd); alarm(0); switch (ret) { case 0: break; case -1: goto error500; case 1: return 1; } #ifdef TCP_CORK if (corked) { int zero = 0; setsockopt(1, IPPROTO_TCP, TCP_CORK, &zero, sizeof(zero)); } #endif if (keepalive > 0) { close(fd); fchdir(rootdir); close(rootdir); goto handlenext; } exit(0); error500: retcode = 500; } else fflush(stdout); } } switch (retcode) { case 404: { char *space = alloca(strlen(url) + 2); if (handleindexcgi(url, origurl, space)) goto indexcgi; handleredirect(url, origurl); if (dirlist) { handledirlist(origurl); } badrequest(404, "Not Found", "No such file or directory."); } case 406: badrequest(406, "Not Acceptable", "Nothing acceptable found."); case 416: badrequest(416, "Requested Range Not Satisfiable", ""); case 304: badrequest(304, "Not Changed", ""); case 500: badrequest(500, "Internal Server Error", ""); } return 1; }