diff options
Diffstat (limited to 'network_cmds/kdumpd.tproj/kdumpsubs.c')
| -rw-r--r-- | network_cmds/kdumpd.tproj/kdumpsubs.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/network_cmds/kdumpd.tproj/kdumpsubs.c b/network_cmds/kdumpd.tproj/kdumpsubs.c new file mode 100644 index 0000000..283ca62 --- /dev/null +++ b/network_cmds/kdumpd.tproj/kdumpsubs.c @@ -0,0 +1,273 @@ +/* + * Copyright (c) 1983, 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. + */ + +/* Simple minded read-ahead/write-behind subroutines for tftp user and + server. Written originally with multiple buffers in mind, but current + implementation has two buffer logic wired in. + + Todo: add some sort of final error check so when the write-buffer + is finally flushed, the caller can detect if the disk filled up + (or had an i/o error) and return a nak to the other side. + + Jim Guyton 10/85 + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#ifdef HAVE_SYS_FILIO_H +#include <sys/filio.h> +#endif +#include <netinet/in.h> +#include "kdump.h" + +#include <stdio.h> +#include <unistd.h> +#include <syslog.h> + +#include "kdumpsubs.h" + +#define PKTSIZE SEGSIZE+6 /* should be moved to kdump.h */ + +struct bf { + int counter; /* size of data in buffer, or flag */ + char buf[MAXIMUM_KDP_PKTSIZE]; /* room for data packet */ +} bfs[2]; + + /* Values for bf.counter */ +#define BF_ALLOC -3 /* alloc'd but not yet filled */ +#define BF_FREE -2 /* free */ +/* [-1 .. SEGSIZE] = size of data in the data buffer */ + +static int nextone; /* index of next buffer to use */ +static int current; /* index of buffer in use */ + + /* control flags for crlf conversions */ +int newline = 0; /* fillbuf: in middle of newline expansion */ +int prevchar = -1; /* putbuf: previous char (cr check) */ + +static struct kdumphdr *rw_init __P ((int)); + +struct kdumphdr *w_init() { return rw_init(0); } /* write-behind */ +struct kdumphdr *r_init() { return rw_init(1); } /* read-ahead */ + +extern uint32_t kdp_crashdump_pkt_size; +extern uint32_t kdp_crashdump_seg_size; + +/* init for either read-ahead or write-behind */ +/* zero for write-behind, one for read-head */ +static struct kdumphdr * +rw_init(int x) +{ + newline = 0; /* init crlf flag */ + prevchar = -1; + bfs[0].counter = BF_ALLOC; /* pass out the first buffer */ + current = 0; + bfs[1].counter = BF_FREE; + nextone = x; /* ahead or behind? */ + return (struct kdumphdr *)bfs[0].buf; +} + + +/* Have emptied current buffer by sending to net and getting ack. + Free it and return next buffer filled with data. + */ +/* if true, convert to ascii */ +/* file opened for read */ + +/* int */ +/* readit(FILE *file, struct kdumphdr **dpp, int convert) */ +/* { */ +/* struct bf *b; */ + +/* bfs[current].counter = BF_FREE; /\* free old one *\/ */ +/* current = !current; /\* "incr" current *\/ */ + +/* b = &bfs[current]; /\* look at new buffer *\/ */ +/* if (b->counter == BF_FREE) /\* if it's empty *\/ */ +/* read_ahead(file, convert); /\* fill it *\/ */ +/* /\* assert(b->counter != BF_FREE);*\//\* check *\/ */ +/* *dpp = (struct kdumphdr *)b->buf; /\* set caller's ptr *\/ */ +/* return b->counter; */ +/* } */ + +/* + * fill the input buffer, doing ascii conversions if requested + * conversions are lf -> cr,lf and cr -> cr, nul + */ +/* FILE *file; file opened for read */ +/* int convert; if true, convert to ascii */ +void +read_ahead(FILE *file, int convert) +{ + register int i; + register char *p; + register int c; + struct bf *b; + struct kdumphdr *dp; + + b = &bfs[nextone]; /* look at "next" buffer */ + if (b->counter != BF_FREE) /* nop if not free */ + return; + nextone = !nextone; /* "incr" next buffer ptr */ + + dp = (struct kdumphdr *)b->buf; + + if (convert == 0) { + b->counter = read(fileno(file), dp->th_data, kdp_crashdump_seg_size); + return; + } + + p = dp->th_data; + for (i = 0 ; i < kdp_crashdump_seg_size; i++) { + if (newline) { + if (prevchar == '\n') + c = '\n'; /* lf to cr,lf */ + else c = '\0'; /* cr to cr,nul */ + newline = 0; + } + else { + c = getc(file); + if (c == EOF) break; + if (c == '\n' || c == '\r') { + prevchar = c; + c = '\r'; + newline = 1; + } + } + *p++ = c; + } + b->counter = (int)(p - dp->th_data); +} + +/* Update count associated with the buffer, get new buffer + from the queue. Calls write_behind only if next buffer not + available. + */ +int +writeit(FILE *file, struct kdumphdr **dpp, int ct, int convert) +{ + bfs[current].counter = ct; /* set size of data to write */ + current = !current; /* switch to other buffer */ + if (bfs[current].counter != BF_FREE) /* if not free */ + (void)write_behind(file, convert); /* flush it */ + bfs[current].counter = BF_ALLOC; /* mark as alloc'd */ + *dpp = (struct kdumphdr *)bfs[current].buf; + return ct; /* this is a lie of course */ +} + + +/* + * Output a buffer to a file, converting from netascii if requested. + * CR,NUL -> CR and CR,LF => LF. + * Note spec is undefined if we get CR as last byte of file or a + * CR followed by anything else. In this case we leave it alone. + */ +int +write_behind(FILE *file, int convert) +{ + char *buf; + int count; + register int ct; + register char *p; + register int c; /* current character */ + struct bf *b; + struct kdumphdr *dp; + + b = &bfs[nextone]; + if (b->counter < -1) /* anything to flush? */ + return 0; /* just nop if nothing to do */ + + count = b->counter; /* remember byte count */ + b->counter = BF_FREE; /* reset flag */ + dp = (struct kdumphdr *)b->buf; + nextone = !nextone; /* incr for next time */ + buf = dp->th_data; + + if (count <= 0) return -1; /* nak logic? */ + + if (convert == 0) + return write(fileno(file), buf, count); + + p = buf; + ct = count; + while (ct--) { /* loop over the buffer */ + c = *p++; /* pick up a character */ + if (prevchar == '\r') { /* if prev char was cr */ + if (c == '\n') /* if have cr,lf then just */ + fseek(file, -1, 1); /* smash lf on top of the cr */ + else + if (c == '\0') /* if have cr,nul then */ + goto skipit; /* just skip over the putc */ + /* else just fall through and allow it */ + } + putc(c, file); +skipit: + prevchar = c; + } + return count; +} + + +/* When an error has occurred, it is possible that the two sides + * are out of synch. Ie: that what I think is the other side's + * response to packet N is really their response to packet N-1. + * + * So, to try to prevent that, we flush all the input queued up + * for us on the network connection on our host. + * + * We return the number of packets we flushed (mostly for reporting + * when trace is active). + */ + +/*int f;socket to flush */ +int +synchnet(int f) +{ + int i, j = 0; + char rbuf[kdp_crashdump_pkt_size]; + struct sockaddr_in from; + socklen_t fromlen; + + while (1) { + (void) ioctl(f, FIONREAD, &i); + if (i) { + j++; + fromlen = sizeof from; + (void) recvfrom(f, rbuf, sizeof (rbuf), 0, + (struct sockaddr *)&from, &fromlen); + } else { + return(j); + } + } +} |