2 * env.c -- small service routines
4 * Copyright 1998 by Eric S. Raymond
5 * For license terms, see the file COPYING in this directory.
15 #ifdef HAVE_NET_SOCKET_H
16 #include <net/socket.h>
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include "fetchmail.h"
22 #include "getaddrinfo.h"
25 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
29 #ifndef HAVE_DECL_GETENV
30 extern char *getenv(const char *); /* needed on sysV68 R3V7.1. */
33 void envquery(int argc, char **argv)
34 /* set up basic stuff from the environment (including the rc file name) */
36 struct passwd by_name, by_uid, *pwp;
41 if (!(user = getenv("FETCHMAILUSER")))
43 if (!(user = getenv("LOGNAME")))
45 user = getenv("USER");
49 if ((program_name = strrchr(argv[0], '/')) != NULL)
52 program_name = argv[0];
54 if (getenv("QMAILINJECT") && strcmp(getenv("QMAILINJECT"), ""))
57 GT_("%s: The QMAILINJECT environment variable is set.\n"
58 "This is dangerous as it can make qmail-inject or qmail's sendmail wrapper\n"
59 "tamper with your From: or Message-ID: headers.\n"
60 "Try \"env QMAILINJECT= %s YOUR ARGUMENTS HERE\"\n"
62 program_name, program_name, program_name);
66 if (getenv("NULLMAILER_FLAGS") && strcmp(getenv("NULLMAILER_FLAGS"), ""))
69 GT_("%s: The NULLMAILER_FLAGS environment variable is set.\n"
70 "This is dangerous as it can make nullmailer-inject or nullmailer's\n"
71 "sendmail wrapper tamper with your From:, Message-ID: or Return-Path: headers.\n"
72 "Try \"env NULLMAILER_FLAGS= %s YOUR ARGUMENTS HERE\"\n"
74 program_name, program_name, program_name);
78 if (!(pwp = getpwuid(getuid())))
81 GT_("%s: You don't exist. Go away.\n"),
87 memcpy(&by_uid, pwp, sizeof(struct passwd));
88 if (!user || !(pwp = getpwnam(user)))
93 * This logic is needed to handle gracefully the possibility
94 * that multiple names might be mapped to one UID.
96 memcpy(&by_name, pwp, sizeof(struct passwd));
98 if (by_name.pw_uid == by_uid.pw_uid)
103 user = xstrdup(pwp->pw_name);
108 /* compute user's home directory */
109 home = getenv("HOME_ETC");
110 if (!home && !(home = getenv("HOME")))
111 home = xstrdup(pwp->pw_dir);
113 /* compute fetchmail's home directory */
114 if (!(fmhome = getenv("FETCHMAILHOME")))
117 #define RCFILE_NAME "fetchmailrc"
119 * The (fmhome==home) leaves an extra character for a . at the
120 * beginning of the rc file's name, iff fetchmail is using $HOME
121 * for its files. We don't want to do that if fetchmail has its
122 * own home ($FETCHMAILHOME), however.
124 rcfile = (char *)xmalloc(strlen(fmhome)+sizeof(RCFILE_NAME)+(fmhome==home)+2);
125 /* avoid //.fetchmailrc */
126 if (strcmp(fmhome, "/") != 0)
127 strcpy(rcfile, fmhome);
131 if (rcfile[strlen(rcfile) - 1] != '/')
135 strcat(rcfile, RCFILE_NAME);
138 char *host_fqdn(int required)
140 char tmpbuf[HOSTLEN+1];
143 if (gethostname(tmpbuf, sizeof(tmpbuf)))
145 fprintf(stderr, GT_("%s: can't determine your host!"),
150 /* if we got no . in the hostname, try to canonicalize it,
151 * else assume it is a FQDN */
152 if (strchr(tmpbuf, '.') == NULL)
154 /* if we got a basename without dots, as we often do in Linux,
155 * look up canonical name (make a FQDN of it) */
156 struct addrinfo hints, *res;
159 memset(&hints, 0, sizeof hints);
160 hints.ai_family = AF_UNSPEC;
161 hints.ai_socktype = SOCK_STREAM;
162 hints.ai_flags = AI_CANONNAME;
164 e = fm_getaddrinfo(tmpbuf, NULL, &hints, &res);
166 /* exit with error message */
168 GT_("gethostbyname failed for %s\n"), tmpbuf);
169 fprintf(stderr, "%s", gai_strerror(e));
170 fprintf(stderr, GT_("Cannot find my own host in hosts database to qualify it!\n"));
174 fprintf(stderr, GT_("Trying to continue with unqualified hostname.\nDO NOT report broken Received: headers, HELO/EHLO lines or similar problems!\nDO repair your /etc/hosts, DNS, NIS or LDAP instead.\n"));
175 return xstrdup(tmpbuf);
179 result = xstrdup(res->ai_canonname ? res->ai_canonname : tmpbuf);
180 fm_freeaddrinfo(res);
183 result = xstrdup(tmpbuf);
188 static char *tzoffset(time_t *now)
189 /* calculate timezone offset */
191 static char offset_string[6];
198 off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
199 if (lt->tm_year < gmt.tm_year)
201 else if (lt->tm_year > gmt.tm_year)
203 else if (lt->tm_yday < gmt.tm_yday)
205 else if (lt->tm_yday > gmt.tm_yday)
211 if (off >= 24 * 60) /* should be impossible */
212 off = 23 * 60 + 59; /* if not, insert silly value */
213 snprintf(offset_string, sizeof(offset_string),
214 "%c%02d%02d", sign, off / 60, off % 60);
215 return (offset_string);
218 char *rfc822timestamp(void)
219 /* return a timestamp in RFC822 form */
226 * Conform to RFC822. We generate a 4-digit year here, avoiding
227 * Y2K hassles. Max length of this timestamp in an English locale
228 * should be 29 chars. The only things that should vary by locale
229 * are the day and month abbreviations. The set_locale calls prevent
230 * weird multibyte i18n characters (such as kanji) from showing up
231 * in your Received headers.
233 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
234 setlocale (LC_TIME, "C");
236 strftime(buf, sizeof(buf)-1,
237 "%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
238 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
239 setlocale (LC_TIME, "");
241 strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
245 const char *showproto(int proto)
246 /* protocol index to protocol name mapping */
250 case P_AUTO: return("auto");
252 case P_POP3: return("POP3");
253 case P_APOP: return("APOP");
254 case P_RPOP: return("RPOP");
255 #endif /* POP3_ENABLE */
257 case P_IMAP: return("IMAP");
258 #endif /* IMAP_ENABLE */
260 case P_ETRN: return("ETRN");
261 #endif /* ETRN_ENABLE */
263 case P_ODMR: return("ODMR");
264 #endif /* ODMR_ENABLE */
265 default: return("unknown?!?");
269 char *visbuf(const char *buf)
270 /* visibilize a given string */
277 needed = strlen(buf) * 5 + 1; /* worst case: HEX, plus NUL byte */
279 if (!vbuf || needed > vbufs) {
281 vbuf = (char *)xrealloc(vbuf, vbufs);
288 if (*buf == '"') { *tp++ = '\\'; *tp++ = '"'; buf++; }
289 else if (*buf == '\\') { *tp++ = '\\'; *tp++ = '\\'; buf++; }
290 else if (isprint((unsigned char)*buf) || *buf == ' ') *tp++ = *buf++;
291 else if (*buf == '\a') { *tp++ = '\\'; *tp++ = 'a'; buf++; }
292 else if (*buf == '\b') { *tp++ = '\\'; *tp++ = 'b'; buf++; }
293 else if (*buf == '\f') { *tp++ = '\\'; *tp++ = 'f'; buf++; }
294 else if (*buf == '\n') { *tp++ = '\\'; *tp++ = 'n'; buf++; }
295 else if (*buf == '\r') { *tp++ = '\\'; *tp++ = 'r'; buf++; }
296 else if (*buf == '\t') { *tp++ = '\\'; *tp++ = 't'; buf++; }
297 else if (*buf == '\v') { *tp++ = '\\'; *tp++ = 'v'; buf++; }
300 const char hex[] = "0123456789abcdef";
301 *tp++ = '\\'; *tp++ = '0'; *tp++ = 'x';
302 *tp++ = hex[*buf >> 4];
303 *tp++ = hex[*buf & 0xf];
310 /* env.c ends here */