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>
22 #ifdef HAVE_GETHOSTBYNAME
24 #endif /* HAVE_GETHOSTBYNAME */
25 #include <sys/types.h>
27 #include "fetchmail.h"
30 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
35 extern char *getenv(); /* needed on sysV68 R3V7.1. */
37 extern char *program_name;
39 void envquery(int argc, char **argv)
40 /* set up basic stuff from the environment (including the rc file name) */
42 struct passwd by_name, by_uid, *pwp;
44 if (!(user = getenv("FETCHMAILUSER")))
46 if (!(user = getenv("LOGNAME")))
48 user = getenv("USER");
52 if ((program_name = strrchr(argv[0], '/')) != NULL)
55 program_name = argv[0];
57 if (getenv("QMAILINJECT") && strcmp(getenv("QMAILINJECT"), ""))
60 GT_("%s: The QMAILINJECT environment variable is set.\n"
61 "This is dangerous as it can make qmail-inject or qmail's sendmail wrapper\n"
62 "tamper with your From: or Message-ID: headers.\n"
63 "Try \"env QMAILINJECT= %s YOUR ARGUMENTS HERE\"\n"
65 program_name, program_name, program_name);
69 if (getenv("NULLMAILER_FLAGS") && strcmp(getenv("NULLMAILER_FLAGS"), ""))
72 GT_("%s: The NULLMAILER_FLAGS environment variable is set.\n"
73 "This is dangerous as it can make nullmailer-inject or nullmailer's\n"
74 "sendmail wrapper tamper with your From:, Message-ID: or Return-Path: headers.\n"
75 "Try \"env NULLMAILER_FLAGS= %s YOUR ARGUMENTS HERE\"\n"
77 program_name, program_name, program_name);
81 if (!(pwp = getpwuid(getuid())))
84 GT_("%s: You don't exist. Go away.\n"),
90 memcpy(&by_uid, pwp, sizeof(struct passwd));
91 if (!user || !(pwp = getpwnam(user)))
96 * This logic is needed to handle gracefully the possibility
97 * that multiple names might be mapped to one UID.
99 memcpy(&by_name, pwp, sizeof(struct passwd));
101 if (by_name.pw_uid == by_uid.pw_uid)
106 user = xstrdup(pwp->pw_name);
109 /* compute user's home directory */
110 if (!(home = getenv("HOME")))
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(void)
139 /* get the FQDN of the machine we're running */
141 char tmpbuf[HOSTLEN+1];
143 if (gethostname(tmpbuf, sizeof(tmpbuf)))
145 fprintf(stderr, GT_("%s: can't determine your host!"),
149 #ifdef HAVE_GETHOSTBYNAME
150 /* if we got a . in the hostname assume it is a FQDN */
151 if (strchr(tmpbuf, '.') == NULL)
155 /* if we got a basename (as we do in Linux) make a FQDN of it */
156 hp = gethostbyname(tmpbuf);
157 if (hp == (struct hostent *) NULL)
159 /* exit with error message */
161 GT_("gethostbyname failed for %s\n"), tmpbuf);
164 return(xstrdup(hp->h_name));
167 #endif /* HAVE_GETHOSTBYNAME */
168 return(xstrdup(tmpbuf));
171 static char *tzoffset(time_t *now)
172 /* calculate timezone offset */
174 static char offset_string[6];
181 off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
182 if (lt->tm_year < gmt.tm_year)
184 else if (lt->tm_year > gmt.tm_year)
186 else if (lt->tm_yday < gmt.tm_yday)
188 else if (lt->tm_yday > gmt.tm_yday)
194 if (off >= 24 * 60) /* should be impossible */
195 off = 23 * 60 + 59; /* if not, insert silly value */
196 sprintf(offset_string, "%c%02d%02d", sign, off / 60, off % 60);
197 return (offset_string);
200 char *rfc822timestamp(void)
201 /* return a timestamp in RFC822 form */
209 * Conform to RFC822. We generate a 4-digit year here, avoiding
210 * Y2K hassles. Max length of this timestamp in an English locale
211 * should be 29 chars. The only things that should vary by locale
212 * are the day and month abbreviations. The set_locale calls prevent
213 * weird multibyte i18n characters (such as kanji) from showing up
214 * in your Received headers.
216 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
217 setlocale (LC_TIME, "C");
219 strftime(buf, sizeof(buf)-1,
220 "%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
221 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
222 setlocale (LC_TIME, "");
224 strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
227 * This is really just a portability fallback, as the
228 * date format ctime(3) emits is not RFC822
231 strcpy(buf, ctime(&now));
232 buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
233 #endif /* HAVE_STRFTIME */
238 const char *showproto(int proto)
239 /* protocol index to protocol name mapping */
243 case P_AUTO: return("auto");
245 case P_POP2: return("POP2");
246 #endif /* POP2_ENABLE */
248 case P_POP3: return("POP3");
249 case P_APOP: return("APOP");
250 case P_RPOP: return("RPOP");
251 #endif /* POP3_ENABLE */
253 case P_IMAP: return("IMAP");
254 #endif /* IMAP_ENABLE */
256 case P_ETRN: return("ETRN");
257 #endif /* ETRN_ENABLE */
259 case P_ODMR: return("ODMR");
260 #endif /* ODMR_ENABLE */
261 default: return("unknown?!?");
265 char *visbuf(const char *buf)
266 /* visibilize a given string */
268 static char vbuf[BUFSIZ];
275 *tp++ = '\\'; *tp++ = '"';
278 else if (*buf == '\\')
280 *tp++ = '\\'; *tp++ = '\\';
283 else if (isprint(*buf) || *buf == ' ')
285 else if (*buf == '\n')
287 *tp++ = '\\'; *tp++ = 'n';
290 else if (*buf == '\r')
292 *tp++ = '\\'; *tp++ = 'r';
295 else if (*buf == '\b')
297 *tp++ = '\\'; *tp++ = 'b';
302 *tp++ = '\\'; *tp++ = '^'; *tp++ = '@' + *buf;
307 (void) sprintf(tp, "\\0x%02x", *buf++);
315 /* env.c ends here */