diff options
Diffstat (limited to 'usr.bin/mail/util.c')
| -rw-r--r-- | usr.bin/mail/util.c | 598 |
1 files changed, 598 insertions, 0 deletions
diff --git a/usr.bin/mail/util.c b/usr.bin/mail/util.c new file mode 100644 index 0000000..c90fe90 --- /dev/null +++ b/usr.bin/mail/util.c @@ -0,0 +1,598 @@ +/* + * 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. + * 4. 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. + */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)aux.c 8.1 (Berkeley) 6/6/93"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#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. + */ +static 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); + while (*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"); + (void)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); + } + (void)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; + (void)gettimeofday(&tv[0], (struct timezone *)NULL); + tv[0].tv_sec++; + TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtim); + (void)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 == ',' && !gotlt && + (*cp == ' ' || *cp == '"' || *cp == '<')) { + *cp2++ = ' '; + while (*cp == ' ') + 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 occurrences 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); +} |
