/usr.bin/mail/util.c
C | 590 lines | 414 code | 49 blank | 127 comment | 175 complexity | 17ceb73e7bf1523472f0b4b26d9fe0ad MD5 | raw file
- /*
- * Copyright (c) 1980, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)aux.c 8.1 (Berkeley) 6/6/93
- * $FreeBSD: src/usr.bin/mail/aux.c,v 1.4.6.4 2003/01/06 05:46:03 mikeh Exp $
- */
- #include <sys/time.h>
- #include "rcv.h"
- #include "extern.h"
- /*
- * Mail -- a mail program
- *
- * Auxiliary functions.
- */
- static char *save2str(char *, char *);
- /*
- * Return a pointer to a dynamic copy of the argument.
- */
- char *
- savestr(char *str)
- {
- char *new;
- int size = strlen(str) + 1;
- if ((new = salloc(size)) != NULL)
- bcopy(str, new, size);
- return (new);
- }
- /*
- * Make a copy of new argument incorporating old one.
- */
- char *
- save2str(char *str, char *old)
- {
- char *new;
- int newsize = strlen(str) + 1;
- int oldsize = old ? strlen(old) + 1 : 0;
- if ((new = salloc(newsize + oldsize)) != NULL) {
- if (oldsize) {
- bcopy(old, new, oldsize);
- new[oldsize - 1] = ' ';
- }
- bcopy(str, new + oldsize, newsize);
- }
- return (new);
- }
- /*
- * Touch the named message by setting its MTOUCH flag.
- * Touched messages have the effect of not being sent
- * back to the system mailbox on exit.
- */
- void
- touch(struct message *mp)
- {
- mp->m_flag |= MTOUCH;
- if ((mp->m_flag & MREAD) == 0)
- mp->m_flag |= MREAD|MSTATUS;
- }
- /*
- * Test to see if the passed file name is a directory.
- * Return true if it is.
- */
- int
- isdir(char *name)
- {
- struct stat sbuf;
- if (stat(name, &sbuf) < 0)
- return (0);
- return (S_ISDIR(sbuf.st_mode));
- }
- /*
- * Count the number of arguments in the given string raw list.
- */
- int
- argcount(char **argv)
- {
- char **ap;
- for (ap = argv; *ap++ != NULL;)
- ;
- return (ap - argv - 1);
- }
- /*
- * Return the desired header line from the passed message
- * pointer (or NULL if the desired header field is not available).
- */
- char *
- hfield(const char *field, struct message *mp)
- {
- FILE *ibuf;
- char linebuf[LINESIZE];
- int lc;
- char *hfield;
- char *colon, *oldhfield = NULL;
- ibuf = setinput(mp);
- if ((lc = mp->m_lines - 1) < 0)
- return (NULL);
- if (readline(ibuf, linebuf, LINESIZE) < 0)
- return (NULL);
- while (lc > 0) {
- if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
- return (oldhfield);
- if ((hfield = ishfield(linebuf, colon, field)) != NULL)
- oldhfield = save2str(hfield, oldhfield);
- }
- return (oldhfield);
- }
- /*
- * Return the next header field found in the given message.
- * Return >= 0 if something found, < 0 elsewise.
- * "colon" is set to point to the colon in the header.
- * Must deal with \ continuations & other such fraud.
- */
- int
- gethfield(FILE *f, char *linebuf, int rem, char **colon)
- {
- char line2[LINESIZE];
- char *cp, *cp2;
- int c;
- for (;;) {
- if (--rem < 0)
- return (-1);
- if ((c = readline(f, linebuf, LINESIZE)) <= 0)
- return (-1);
- for (cp = linebuf; isprint((unsigned char)*cp) && *cp != ' ' && *cp != ':';
- cp++)
- ;
- if (*cp != ':' || cp == linebuf)
- continue;
- /*
- * I guess we got a headline.
- * Handle wraparounding
- */
- *colon = cp;
- cp = linebuf + c;
- for (;;) {
- while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
- ;
- cp++;
- if (rem <= 0)
- break;
- ungetc(c = getc(f), f);
- if (c != ' ' && c != '\t')
- break;
- if ((c = readline(f, line2, LINESIZE)) < 0)
- break;
- rem--;
- for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
- ;
- c -= cp2 - line2;
- if (cp + c >= linebuf + LINESIZE - 2)
- break;
- *cp++ = ' ';
- bcopy(cp2, cp, c);
- cp += c;
- }
- *cp = 0;
- return (rem);
- }
- /* NOTREACHED */
- }
- /*
- * Check whether the passed line is a header line of
- * the desired breed. Return the field body, or 0.
- */
- char*
- ishfield(char *linebuf, char *colon, const char *field)
- {
- char *cp = colon;
- *cp = 0;
- if (strcasecmp(linebuf, field) != 0) {
- *cp = ':';
- return (0);
- }
- *cp = ':';
- for (cp++; *cp == ' ' || *cp == '\t'; cp++)
- ;
- return (cp);
- }
- /*
- * Copy a string and lowercase the result.
- * dsize: space left in buffer (including space for NULL)
- */
- void
- istrncpy(char *dest, const char *src, size_t dsize)
- {
- strlcpy(dest, src, dsize);
- for (; *dest; dest++)
- *dest = tolower((unsigned char)*dest);
- }
- /*
- * The following code deals with input stacking to do source
- * commands. All but the current file pointer are saved on
- * the stack.
- */
- static int ssp; /* Top of file stack */
- struct sstack {
- FILE *s_file; /* File we were in. */
- int s_cond; /* Saved state of conditionals */
- int s_loading; /* Loading .mailrc, etc. */
- };
- #define SSTACK_SIZE 64 /* XXX was NOFILE. */
- static struct sstack sstack[SSTACK_SIZE];
- /*
- * Pushdown current input file and switch to a new one.
- * Set the global flag "sourcing" so that others will realize
- * that they are no longer reading from a tty (in all probability).
- */
- int
- source(char **arglist)
- {
- FILE *fi;
- char *cp;
- if ((cp = expand(*arglist)) == NULL)
- return (1);
- if ((fi = Fopen(cp, "r")) == NULL) {
- warn("%s", cp);
- return (1);
- }
- if (ssp >= SSTACK_SIZE - 1) {
- printf("Too much \"sourcing\" going on.\n");
- Fclose(fi);
- return (1);
- }
- sstack[ssp].s_file = input;
- sstack[ssp].s_cond = cond;
- sstack[ssp].s_loading = loading;
- ssp++;
- loading = 0;
- cond = CANY;
- input = fi;
- sourcing++;
- return (0);
- }
- /*
- * Pop the current input back to the previous level.
- * Update the "sourcing" flag as appropriate.
- */
- int
- unstack(void)
- {
- if (ssp <= 0) {
- printf("\"Source\" stack over-pop.\n");
- sourcing = 0;
- return (1);
- }
- Fclose(input);
- if (cond != CANY)
- printf("Unmatched \"if\"\n");
- ssp--;
- cond = sstack[ssp].s_cond;
- loading = sstack[ssp].s_loading;
- input = sstack[ssp].s_file;
- if (ssp == 0)
- sourcing = loading;
- return (0);
- }
- /*
- * Touch the indicated file.
- * This is nifty for the shell.
- */
- void
- alter(char *name)
- {
- struct stat sb;
- struct timeval tv[2];
- if (stat(name, &sb))
- return;
- gettimeofday(&tv[0], NULL);
- tv[0].tv_sec++;
- TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
- utimes(name, tv);
- }
- /*
- * Get sender's name from this message. If the message has
- * a bunch of arpanet stuff in it, we may have to skin the name
- * before returning it.
- */
- char *
- nameof(struct message *mp, int reptype)
- {
- char *cp, *cp2;
- cp = skin(name1(mp, reptype));
- if (reptype != 0 || charcount(cp, '!') < 2)
- return (cp);
- cp2 = strrchr(cp, '!');
- cp2--;
- while (cp2 > cp && *cp2 != '!')
- cp2--;
- if (*cp2 == '!')
- return (cp2 + 1);
- return (cp);
- }
- /*
- * Start of a "comment".
- * Ignore it.
- */
- char *
- skip_comment(char *cp)
- {
- int nesting = 1;
- for (; nesting > 0 && *cp; cp++) {
- switch (*cp) {
- case '\\':
- if (cp[1])
- cp++;
- break;
- case '(':
- nesting++;
- break;
- case ')':
- nesting--;
- break;
- }
- }
- return (cp);
- }
- /*
- * Skin an arpa net address according to the RFC 822 interpretation
- * of "host-phrase."
- */
- char *
- skin(char *name)
- {
- char *nbuf, *bufend, *cp, *cp2;
- int c, gotlt, lastsp;
- if (name == NULL)
- return (NULL);
- if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
- && strchr(name, ' ') == NULL)
- return (name);
- /* We assume that length(input) <= length(output) */
- if ((nbuf = malloc(strlen(name) + 1)) == NULL)
- err(1, "Out of memory");
- gotlt = 0;
- lastsp = 0;
- bufend = nbuf;
- for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; ) {
- switch (c) {
- case '(':
- cp = skip_comment(cp);
- lastsp = 0;
- break;
- case '"':
- /*
- * Start of a "quoted-string".
- * Copy it in its entirety.
- */
- while ((c = *cp) != '\0') {
- cp++;
- if (c == '"')
- break;
- if (c != '\\')
- *cp2++ = c;
- else if ((c = *cp) != '\0') {
- *cp2++ = c;
- cp++;
- }
- }
- lastsp = 0;
- break;
- case ' ':
- if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
- cp += 3, *cp2++ = '@';
- else
- if (cp[0] == '@' && cp[1] == ' ')
- cp += 2, *cp2++ = '@';
- else
- lastsp = 1;
- break;
- case '<':
- cp2 = bufend;
- gotlt++;
- lastsp = 0;
- break;
- case '>':
- if (gotlt) {
- gotlt = 0;
- while ((c = *cp) != '\0' && c != ',') {
- cp++;
- if (c == '(')
- cp = skip_comment(cp);
- else if (c == '"')
- while ((c = *cp) != '\0') {
- cp++;
- if (c == '"')
- break;
- if (c == '\\' && *cp != '\0')
- cp++;
- }
- }
- lastsp = 0;
- break;
- }
- /* FALLTHROUGH */
- default:
- if (lastsp) {
- lastsp = 0;
- *cp2++ = ' ';
- }
- *cp2++ = c;
- if (c == ',' && *cp == ' ' && !gotlt) {
- *cp2++ = ' ';
- while (*++cp == ' ')
- ;
- lastsp = 0;
- bufend = cp2;
- }
- }
- }
- *cp2 = '\0';
- if ((cp = realloc(nbuf, strlen(nbuf) + 1)) != NULL)
- nbuf = cp;
- return (nbuf);
- }
- /*
- * Fetch the sender's name from the passed message.
- * Reptype can be
- * 0 -- get sender's name for display purposes
- * 1 -- get sender's name for reply
- * 2 -- get sender's name for Reply
- */
- char *
- name1(struct message *mp, int reptype)
- {
- char namebuf[LINESIZE];
- char linebuf[LINESIZE];
- char *cp, *cp2;
- FILE *ibuf;
- int first = 1;
- if ((cp = hfield("from", mp)) != NULL)
- return (cp);
- if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
- return (cp);
- ibuf = setinput(mp);
- namebuf[0] = '\0';
- if (readline(ibuf, linebuf, LINESIZE) < 0)
- return (savestr(namebuf));
- newname:
- for (cp = linebuf; *cp != '\0' && *cp != ' '; cp++)
- ;
- for (; *cp == ' ' || *cp == '\t'; cp++)
- ;
- for (cp2 = &namebuf[strlen(namebuf)];
- *cp != '\0' && *cp != ' ' && *cp != '\t' &&
- cp2 < namebuf + LINESIZE - 1;)
- *cp2++ = *cp++;
- *cp2 = '\0';
- if (readline(ibuf, linebuf, LINESIZE) < 0)
- return (savestr(namebuf));
- if ((cp = strchr(linebuf, 'F')) == NULL)
- return (savestr(namebuf));
- if (strncmp(cp, "From", 4) != 0)
- return (savestr(namebuf));
- while ((cp = strchr(cp, 'r')) != NULL) {
- if (strncmp(cp, "remote", 6) == 0) {
- if ((cp = strchr(cp, 'f')) == NULL)
- break;
- if (strncmp(cp, "from", 4) != 0)
- break;
- if ((cp = strchr(cp, ' ')) == NULL)
- break;
- cp++;
- if (first) {
- cp2 = namebuf;
- first = 0;
- } else
- cp2 = strrchr(namebuf, '!') + 1;
- strlcpy(cp2, cp, sizeof(namebuf) - (cp2 - namebuf) - 1);
- strcat(namebuf, "!");
- goto newname;
- }
- cp++;
- }
- return (savestr(namebuf));
- }
- /*
- * Count the occurances of c in str
- */
- int
- charcount(char *str, int c)
- {
- char *cp;
- int i;
- for (i = 0, cp = str; *cp != '\0'; cp++)
- if (*cp == c)
- i++;
- return (i);
- }
- /*
- * See if the given header field is supposed to be ignored.
- */
- int
- isign(const char *field, struct ignoretab ignore[2])
- {
- char realfld[LINESIZE];
- if (ignore == ignoreall)
- return (1);
- /*
- * Lower-case the string, so that "Status" and "status"
- * will hash to the same place.
- */
- istrncpy(realfld, field, sizeof(realfld));
- if (ignore[1].i_count > 0)
- return (!member(realfld, ignore + 1));
- else
- return (member(realfld, ignore));
- }
- int
- member(char *realfield, struct ignoretab *table)
- {
- struct ignore *igp;
- for (igp = table->i_head[hash(realfield)]; igp != NULL; igp = igp->i_link)
- if (*igp->i_field == *realfield &&
- equal(igp->i_field, realfield))
- return (1);
- return (0);
- }