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"
31 extern char *getenv(); /* needed on sysV68 R3V7.1. */
33 extern char *program_name;
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("LOGNAME")))
41 user = getenv("USER");
43 if (!(pwp = getpwuid(getuid())))
46 _("%s: You don't exist. Go away.\n"),
52 memcpy(&by_uid, pwp, sizeof(struct passwd));
55 else if ((pwp = getpwnam(user)))
58 * This logic is needed to handle gracefully the possibility
59 * that multiple names might be mapped to one UID
61 memcpy(&by_name, pwp, sizeof(struct passwd));
63 if (by_name.pw_uid == by_uid.pw_uid)
71 _("%s: can't find your name and home directory!\n"),
75 user = xstrdup(pwp->pw_name);
78 /* compute user's home directory */
79 if (!(home = getenv("HOME")))
82 /* compute fetchmail's home directory */
83 if (!(fmhome = getenv("FETCHMAILHOME")))
86 if ((program_name = strrchr(argv[0], '/')) != NULL)
89 program_name = argv[0];
91 #define RCFILE_NAME "fetchmailrc"
93 * The (fmhome==home) leaves an extra character for a . at the
94 * beginning of the rc file's name, iff fetchmail is using $HOME
95 * for its files. We don't want to do that if fetchmail has its
96 * own home ($FETCHMAILHOME), however.
98 rcfile = (char *)xmalloc(strlen(fmhome)+sizeof(RCFILE_NAME)+(fmhome==home)+1);
99 /* avoid //.fetchmailrc */
100 if (strcmp(fmhome, "/") != 0) {
101 strcat(rcfile, fmhome);
108 strcat(rcfile, RCFILE_NAME);
111 char *host_fqdn(void)
112 /* get the FQDN of the machine we're running */
114 char tmpbuf[HOSTLEN+1];
116 if (gethostname(tmpbuf, sizeof(tmpbuf)))
118 fprintf(stderr, _("%s: can't determine your host!"),
122 #ifdef HAVE_GETHOSTBYNAME
123 /* if we got a . in the hostname assume it is a FQDN */
124 if (strchr(tmpbuf, '.') == NULL)
128 /* if we got a basename (as we do in Linux) make a FQDN of it */
129 hp = gethostbyname(tmpbuf);
130 if (hp == (struct hostent *) NULL)
132 /* exit with error message */
134 _("gethostbyname failed for %s\n"), tmpbuf);
137 return(xstrdup(hp->h_name));
140 #endif /* HAVE_GETHOSTBYNAME */
141 return(xstrdup(tmpbuf));
144 static char *tzoffset(time_t *now)
145 /* calculate timezone offset */
147 static char offset_string[6];
154 off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
155 if (lt->tm_year < gmt.tm_year)
157 else if (lt->tm_year > gmt.tm_year)
159 else if (lt->tm_yday < gmt.tm_yday)
161 else if (lt->tm_yday > gmt.tm_yday)
167 if (off >= 24 * 60) /* should be impossible */
168 off = 23 * 60 + 59; /* if not, insert silly value */
169 sprintf(offset_string, "%c%02d%02d", sign, off / 60, off % 60);
170 return (offset_string);
173 char *rfc822timestamp(void)
174 /* return a timestamp in RFC822 form */
182 * Conform to RFC822. We generate a 4-digit year here, avoiding
183 * Y2K hassles. Max length of this timestamp in an English locale
184 * should be 29 chars. The only things that should vary by locale
185 * are the day and month abbreviations.
187 strftime(buf, sizeof(buf)-1,
188 "%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
189 strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
192 * This is really just a portability fallback, as the
193 * date format ctime(3) emits is not RFC822
196 strcpy(buf, ctime(&now));
197 buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
198 #endif /* HAVE_STRFTIME */
203 const char *showproto(int proto)
204 /* protocol index to protocol name mapping */
208 case P_AUTO: return("auto");
210 case P_POP2: return("POP2");
211 #endif /* POP2_ENABLE */
212 case P_POP3: return("POP3");
213 case P_IMAP: return("IMAP");
214 case P_IMAP_K4: return("IMAP-K4");
216 case P_IMAP_GSS: return("IMAP-GSS");
218 case P_IMAP_CRAM_MD5: return("IMAP-LOGIN");
219 case P_IMAP_LOGIN: return("IMAP-LOGIN");
220 case P_APOP: return("APOP");
221 case P_RPOP: return("RPOP");
222 case P_ETRN: return("ETRN");
223 default: return("unknown?!?");
227 char *visbuf(const char *buf)
228 /* visibilize a given string */
230 static char vbuf[BUFSIZ];
237 *tp++ = '\\'; *tp++ = '"';
240 else if (*buf == '\\')
242 *tp++ = '\\'; *tp++ = '\\';
245 else if (isprint(*buf) || *buf == ' ')
247 else if (*buf == '\n')
249 *tp++ = '\\'; *tp++ = 'n';
252 else if (*buf == '\r')
254 *tp++ = '\\'; *tp++ = 'r';
257 else if (*buf == '\b')
259 *tp++ = '\\'; *tp++ = 'b';
264 *tp++ = '\\'; *tp++ = '^'; *tp++ = '@' + *buf;
269 (void) sprintf(tp, "\\0x%02x", *buf++);
277 /* env.c ends here */