2 * env.c -- small service routines
4 * Copyright 1998 by Eric S. Raymond
5 * For license terms, see the file COPYING in this directory.
11 #if defined(STDC_HEADERS)
14 #if defined(HAVE_UNISTD_H)
19 #ifdef HAVE_NET_SOCKET_H
20 #include <net/socket.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include "fetchmail.h"
26 #include "getaddrinfo.h"
29 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
33 extern char *getenv(const char *); /* needed on sysV68 R3V7.1. */
35 void envquery(int argc, char **argv)
36 /* set up basic stuff from the environment (including the rc file name) */
38 struct passwd by_name, by_uid, *pwp;
40 if (!(user = getenv("FETCHMAILUSER")))
42 if (!(user = getenv("LOGNAME")))
44 user = getenv("USER");
48 if ((program_name = strrchr(argv[0], '/')) != NULL)
51 program_name = argv[0];
53 if (getenv("QMAILINJECT") && strcmp(getenv("QMAILINJECT"), ""))
56 GT_("%s: The QMAILINJECT environment variable is set.\n"
57 "This is dangerous as it can make qmail-inject or qmail's sendmail wrapper\n"
58 "tamper with your From: or Message-ID: headers.\n"
59 "Try \"env QMAILINJECT= %s YOUR ARGUMENTS HERE\"\n"
61 program_name, program_name, program_name);
65 if (getenv("NULLMAILER_FLAGS") && strcmp(getenv("NULLMAILER_FLAGS"), ""))
68 GT_("%s: The NULLMAILER_FLAGS environment variable is set.\n"
69 "This is dangerous as it can make nullmailer-inject or nullmailer's\n"
70 "sendmail wrapper tamper with your From:, Message-ID: or Return-Path: headers.\n"
71 "Try \"env NULLMAILER_FLAGS= %s YOUR ARGUMENTS HERE\"\n"
73 program_name, program_name, program_name);
77 if (!(pwp = getpwuid(getuid())))
80 GT_("%s: You don't exist. Go away.\n"),
86 memcpy(&by_uid, pwp, sizeof(struct passwd));
87 if (!user || !(pwp = getpwnam(user)))
92 * This logic is needed to handle gracefully the possibility
93 * that multiple names might be mapped to one UID.
95 memcpy(&by_name, pwp, sizeof(struct passwd));
97 if (by_name.pw_uid == by_uid.pw_uid)
102 user = xstrdup(pwp->pw_name);
105 /* compute user's home directory */
106 home = getenv("HOME_ETC");
107 if (!home && !(home = getenv("HOME")))
110 /* compute fetchmail's home directory */
111 if (!(fmhome = getenv("FETCHMAILHOME")))
114 #define RCFILE_NAME "fetchmailrc"
116 * The (fmhome==home) leaves an extra character for a . at the
117 * beginning of the rc file's name, iff fetchmail is using $HOME
118 * for its files. We don't want to do that if fetchmail has its
119 * own home ($FETCHMAILHOME), however.
121 rcfile = (char *)xmalloc(strlen(fmhome)+sizeof(RCFILE_NAME)+(fmhome==home)+2);
122 /* avoid //.fetchmailrc */
123 if (strcmp(fmhome, "/") != 0)
124 strcpy(rcfile, fmhome);
128 if (rcfile[strlen(rcfile) - 1] != '/')
132 strcat(rcfile, RCFILE_NAME);
135 char *host_fqdn(int required /** barf if the name cannot be resolved */)
136 /* get the FQDN of the machine we're running */
138 char tmpbuf[HOSTLEN+1];
141 if (gethostname(tmpbuf, sizeof(tmpbuf)))
143 fprintf(stderr, GT_("%s: can't determine your host!"),
148 /* if we got a . in the hostname assume it is a FQDN */
149 if (strchr(tmpbuf, '.') == NULL)
151 /* if we got a basename (as we do in Linux) make a FQDN of it */
152 struct addrinfo hints, *res;
155 memset(&hints, 0, sizeof hints);
156 hints.ai_family = AF_UNSPEC;
157 hints.ai_socktype = SOCK_STREAM;
158 hints.ai_flags=AI_CANONNAME;
160 e = getaddrinfo(tmpbuf, NULL, &hints, &res);
162 /* exit with error message */
164 GT_("gethostbyname failed for %s\n"), tmpbuf);
165 fprintf(stderr, "%s", gai_strerror(e));
166 fprintf(stderr, GT_("Cannot find my own host in hosts database to qualify it!\n"));
170 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 result = xstrdup(res->ai_canonname);
179 result = xstrdup(tmpbuf);
184 static char *tzoffset(time_t *now)
185 /* calculate timezone offset */
187 static char offset_string[6];
194 off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
195 if (lt->tm_year < gmt.tm_year)
197 else if (lt->tm_year > gmt.tm_year)
199 else if (lt->tm_yday < gmt.tm_yday)
201 else if (lt->tm_yday > gmt.tm_yday)
207 if (off >= 24 * 60) /* should be impossible */
208 off = 23 * 60 + 59; /* if not, insert silly value */
209 snprintf(offset_string, sizeof(offset_string),
210 "%c%02d%02d", sign, off / 60, off % 60);
211 return (offset_string);
214 char *rfc822timestamp(void)
215 /* return a timestamp in RFC822 form */
223 * Conform to RFC822. We generate a 4-digit year here, avoiding
224 * Y2K hassles. Max length of this timestamp in an English locale
225 * should be 29 chars. The only things that should vary by locale
226 * are the day and month abbreviations. The set_locale calls prevent
227 * weird multibyte i18n characters (such as kanji) from showing up
228 * in your Received headers.
230 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
231 setlocale (LC_TIME, "C");
233 strftime(buf, sizeof(buf)-1,
234 "%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
235 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
236 setlocale (LC_TIME, "");
238 strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
241 * This is really just a portability fallback, as the
242 * date format ctime(3) emits is not RFC822
245 strlcpy(buf, ctime(&now), sizeof(buf));
246 buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
247 #endif /* HAVE_STRFTIME */
252 const char *showproto(int proto)
253 /* protocol index to protocol name mapping */
257 case P_AUTO: return("auto");
259 case P_POP2: return("POP2");
260 #endif /* POP2_ENABLE */
262 case P_POP3: return("POP3");
263 case P_APOP: return("APOP");
264 case P_RPOP: return("RPOP");
265 #endif /* POP3_ENABLE */
267 case P_IMAP: return("IMAP");
268 #endif /* IMAP_ENABLE */
270 case P_ETRN: return("ETRN");
271 #endif /* ETRN_ENABLE */
273 case P_ODMR: return("ODMR");
274 #endif /* ODMR_ENABLE */
275 default: return("unknown?!?");
279 char *visbuf(const char *buf)
280 /* visibilize a given string */
287 needed = strlen(buf) * 5 + 1; /* worst case: HEX, plus NUL byte */
289 if (needed > vbufs) {
291 vbuf = xrealloc(vbuf, vbufs);
298 if (*buf == '"') { *tp++ = '\\'; *tp++ = '"'; buf++; }
299 else if (*buf == '\\') { *tp++ = '\\'; *tp++ = '\\'; buf++; }
300 else if (isprint((unsigned char)*buf) || *buf == ' ') *tp++ = *buf++;
301 else if (*buf == '\a') { *tp++ = '\\'; *tp++ = 'a'; buf++; }
302 else if (*buf == '\b') { *tp++ = '\\'; *tp++ = 'b'; buf++; }
303 else if (*buf == '\f') { *tp++ = '\\'; *tp++ = 'f'; buf++; }
304 else if (*buf == '\n') { *tp++ = '\\'; *tp++ = 'n'; buf++; }
305 else if (*buf == '\r') { *tp++ = '\\'; *tp++ = 'r'; buf++; }
306 else if (*buf == '\t') { *tp++ = '\\'; *tp++ = 't'; buf++; }
307 else if (*buf == '\v') { *tp++ = '\\'; *tp++ = 'v'; buf++; }
310 const char hex[] = "0123456789abcdef";
311 *tp++ = '\\'; *tp++ = '0'; *tp++ = 'x';
312 *tp++ = hex[*buf >> 4];
313 *tp++ = hex[*buf & 0xf];
320 /* env.c ends here */