| 1 | /* |
| 2 | ashd - A Sane HTTP Daemon |
| 3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation, either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <unistd.h> |
| 21 | #include <string.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdarg.h> |
| 24 | #include <time.h> |
| 25 | #include <regex.h> |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include <config.h> |
| 29 | #endif |
| 30 | #include <utils.h> |
| 31 | #include <resp.h> |
| 32 | |
| 33 | static char safechars[128] = { |
| 34 | /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */ |
| 35 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 36 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 37 | 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, |
| 38 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, |
| 39 | 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 40 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, |
| 41 | 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 42 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, |
| 43 | }; |
| 44 | |
| 45 | char *urlquote(char *text) |
| 46 | { |
| 47 | static char *ret = NULL; |
| 48 | struct charbuf buf; |
| 49 | unsigned char c; |
| 50 | |
| 51 | if(ret != NULL) |
| 52 | free(ret); |
| 53 | bufinit(buf); |
| 54 | for(; *text; text++) { |
| 55 | c = *text; |
| 56 | if(!c < 128 && safechars[(int)c]) |
| 57 | bufadd(buf, *text); |
| 58 | else |
| 59 | bprintf(&buf, "%%%02X", (int)c); |
| 60 | } |
| 61 | bufadd(buf, 0); |
| 62 | return(ret = buf.b); |
| 63 | } |
| 64 | |
| 65 | char *htmlquote(char *text) |
| 66 | { |
| 67 | static char *ret = NULL; |
| 68 | struct charbuf buf; |
| 69 | |
| 70 | if(ret != NULL) |
| 71 | free(ret); |
| 72 | bufinit(buf); |
| 73 | for(; *text; text++) { |
| 74 | if(*text == '<') |
| 75 | bufcatstr(buf, "<"); |
| 76 | else if(*text == '>') |
| 77 | bufcatstr(buf, ">"); |
| 78 | else if(*text == '&') |
| 79 | bufcatstr(buf, "&"); |
| 80 | else if(*text == '\"') |
| 81 | bufcatstr(buf, """); |
| 82 | else |
| 83 | bufadd(buf, *text); |
| 84 | } |
| 85 | bufadd(buf, 0); |
| 86 | return(ret = buf.b); |
| 87 | } |
| 88 | |
| 89 | static void simpleerror2v(FILE *out, int code, char *msg, char *fmt, va_list args) |
| 90 | { |
| 91 | struct charbuf buf; |
| 92 | char *tmp; |
| 93 | |
| 94 | tmp = vsprintf2(fmt, args); |
| 95 | bufinit(buf); |
| 96 | bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n"); |
| 97 | bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n"); |
| 98 | bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n"); |
| 99 | bufcatstr(buf, "<head>\r\n"); |
| 100 | bprintf(&buf, "<title>%s</title>\r\n", msg); |
| 101 | bufcatstr(buf, "</head>\r\n"); |
| 102 | bufcatstr(buf, "<body>\r\n"); |
| 103 | bprintf(&buf, "<h1>%s</h1>\r\n", msg); |
| 104 | bprintf(&buf, "<p>%s</p>\r\n", htmlquote(tmp)); |
| 105 | bufcatstr(buf, "</body>\r\n"); |
| 106 | bufcatstr(buf, "</html>\r\n"); |
| 107 | fprintf(out, "HTTP/1.1 %i %s\n", code, msg); |
| 108 | fprintf(out, "Content-Type: text/html\n"); |
| 109 | fprintf(out, "Content-Length: %zi\n", buf.d); |
| 110 | fprintf(out, "\n"); |
| 111 | fwrite(buf.b, 1, buf.d, out); |
| 112 | buffree(buf); |
| 113 | free(tmp); |
| 114 | } |
| 115 | |
| 116 | void simpleerror2(FILE *out, int code, char *msg, char *fmt, ...) |
| 117 | { |
| 118 | va_list args; |
| 119 | |
| 120 | va_start(args, fmt); |
| 121 | simpleerror2v(out, code, msg, fmt, args); |
| 122 | va_end(args); |
| 123 | } |
| 124 | |
| 125 | void simpleerror(int fd, int code, char *msg, char *fmt, ...) |
| 126 | { |
| 127 | va_list args; |
| 128 | FILE *out; |
| 129 | |
| 130 | va_start(args, fmt); |
| 131 | out = fdopen(dup(fd), "w"); |
| 132 | simpleerror2v(out, code, msg, fmt, args); |
| 133 | fclose(out); |
| 134 | va_end(args); |
| 135 | } |
| 136 | |
| 137 | void stdredir(struct hthead *req, int fd, int code, char *dst) |
| 138 | { |
| 139 | FILE *out; |
| 140 | char *sp, *cp, *ep, *qs, *path, *url, *adst, *proto, *host; |
| 141 | |
| 142 | sp = strchr(dst, '/'); |
| 143 | cp = strchr(dst, ':'); |
| 144 | if(cp && (!sp || (cp < sp))) { |
| 145 | adst = sstrdup(dst); |
| 146 | } else { |
| 147 | proto = getheader(req, "X-Ash-Protocol"); |
| 148 | host = getheader(req, "Host"); |
| 149 | if((proto == NULL) || (host == NULL)) { |
| 150 | /* Not compliant, but there isn't a whole lot to be done |
| 151 | * about it. */ |
| 152 | adst = sstrdup(dst); |
| 153 | } else { |
| 154 | if(*dst == '/') { |
| 155 | path = sstrdup(dst + 1); |
| 156 | } else { |
| 157 | if((*(url = req->url)) == '/') |
| 158 | url++; |
| 159 | if((ep = strchr(url, '?')) == NULL) { |
| 160 | ep = url + strlen(url); |
| 161 | qs = ""; |
| 162 | } else { |
| 163 | qs = ep; |
| 164 | } |
| 165 | for(; (ep > url) && (ep[-1] != '/'); ep--); |
| 166 | path = sprintf2("%.*s%s%s", ep - url, url, dst, qs); |
| 167 | } |
| 168 | adst = sprintf2("%s://%s/%s", proto, host, path); |
| 169 | free(path); |
| 170 | } |
| 171 | } |
| 172 | out = fdopen(dup(fd), "w"); |
| 173 | fprintf(out, "HTTP/1.1 %i Redirection\n", code); |
| 174 | fprintf(out, "Content-Length: 0\n"); |
| 175 | fprintf(out, "Location: %s\n", adst); |
| 176 | fprintf(out, "\n"); |
| 177 | fclose(out); |
| 178 | free(adst); |
| 179 | } |
| 180 | |
| 181 | char *fmthttpdate(time_t time) |
| 182 | { |
| 183 | /* I avoid using strftime, since it depends on locale settings. */ |
| 184 | static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}; |
| 185 | static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 186 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; |
| 187 | struct tm *tm; |
| 188 | |
| 189 | tm = gmtime(&time); |
| 190 | return(sprintf3("%s, %i %s %i %02i:%02i:%02i GMT", days[(tm->tm_wday + 6) % 7], tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec)); |
| 191 | } |
| 192 | |
| 193 | time_t parsehttpdate(char *date) |
| 194 | { |
| 195 | static regex_t *spec = NULL; |
| 196 | static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 197 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; |
| 198 | int i; |
| 199 | regmatch_t g[11]; |
| 200 | struct tm tm; |
| 201 | int tz; |
| 202 | |
| 203 | int gtoi(regmatch_t g) |
| 204 | { |
| 205 | int i, n; |
| 206 | |
| 207 | for(i = g.rm_so, n = 0; i < g.rm_eo; i++) |
| 208 | n = (n * 10) + (date[i] - '0'); |
| 209 | return(n); |
| 210 | } |
| 211 | |
| 212 | int gstrcmp(regmatch_t g, char *str) { |
| 213 | if(g.rm_eo - g.rm_so != strlen(str)) |
| 214 | return(1); |
| 215 | return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so)); |
| 216 | } |
| 217 | |
| 218 | if(spec == NULL) { |
| 219 | omalloc(spec); |
| 220 | if(regcomp(spec, "^[A-Z]{3}, +([0-9]+) +([A-Z]{3}) +([0-9]+) +([0-9]{2}):([0-9]{2}):([0-9]{2}) +(([A-Z]+)|[+-]([0-9]{2})([0-9]{2}))$", REG_EXTENDED | REG_ICASE)) { |
| 221 | free(spec); |
| 222 | spec = NULL; |
| 223 | return(0); |
| 224 | } |
| 225 | } |
| 226 | if(regexec(spec, date, 11, g, 0)) |
| 227 | return(0); |
| 228 | tm.tm_mday = gtoi(g[1]); |
| 229 | tm.tm_year = gtoi(g[3]) - 1900; |
| 230 | tm.tm_hour = gtoi(g[4]); |
| 231 | tm.tm_min = gtoi(g[5]); |
| 232 | tm.tm_sec = gtoi(g[6]); |
| 233 | |
| 234 | tm.tm_mon = -1; |
| 235 | for(i = 0; i < 12; i++) { |
| 236 | if(!gstrcmp(g[2], months[i])) { |
| 237 | tm.tm_mon = i; |
| 238 | break; |
| 239 | } |
| 240 | } |
| 241 | if(tm.tm_mon < 0) |
| 242 | return(0); |
| 243 | |
| 244 | if(g[8].rm_so > 0) { |
| 245 | if(!gstrcmp(g[8], "GMT")) |
| 246 | tz = 0; |
| 247 | else |
| 248 | return(0); |
| 249 | } else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) { |
| 250 | tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60; |
| 251 | if(date[g[7].rm_so] == '-') |
| 252 | tz = -tz; |
| 253 | } else { |
| 254 | return(0); |
| 255 | } |
| 256 | |
| 257 | return(timegm(&tm) - tz); |
| 258 | } |